[6a3a178] | 1 | /**
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| 2 | * @license
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| 3 | * Copyright Google LLC All Rights Reserved.
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| 4 | *
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| 5 | * Use of this source code is governed by an MIT-style license that can be
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| 6 | * found in the LICENSE file at https://angular.io/license
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| 7 | */
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| 8 | import { EventEmitter } from '@angular/core';
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| 9 | import { removeListItem } from './directives/shared';
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| 10 | import { addValidators, composeAsyncValidators, composeValidators, hasValidator, removeValidators, toObservable } from './validators';
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| 11 | /**
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| 12 | * Reports that a FormControl is valid, meaning that no errors exist in the input value.
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| 13 | *
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| 14 | * @see `status`
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| 15 | */
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| 16 | export const VALID = 'VALID';
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| 17 | /**
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| 18 | * Reports that a FormControl is invalid, meaning that an error exists in the input value.
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| 19 | *
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| 20 | * @see `status`
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| 21 | */
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| 22 | export const INVALID = 'INVALID';
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| 23 | /**
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| 24 | * Reports that a FormControl is pending, meaning that that async validation is occurring and
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| 25 | * errors are not yet available for the input value.
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| 26 | *
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| 27 | * @see `markAsPending`
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| 28 | * @see `status`
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| 29 | */
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| 30 | export const PENDING = 'PENDING';
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| 31 | /**
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| 32 | * Reports that a FormControl is disabled, meaning that the control is exempt from ancestor
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| 33 | * calculations of validity or value.
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| 34 | *
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| 35 | * @see `markAsDisabled`
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| 36 | * @see `status`
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| 37 | */
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| 38 | export const DISABLED = 'DISABLED';
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| 39 | function _find(control, path, delimiter) {
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| 40 | if (path == null)
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| 41 | return null;
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| 42 | if (!Array.isArray(path)) {
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| 43 | path = path.split(delimiter);
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| 44 | }
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| 45 | if (Array.isArray(path) && path.length === 0)
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| 46 | return null;
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| 47 | // Not using Array.reduce here due to a Chrome 80 bug
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| 48 | // https://bugs.chromium.org/p/chromium/issues/detail?id=1049982
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| 49 | let controlToFind = control;
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| 50 | path.forEach((name) => {
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| 51 | if (controlToFind instanceof FormGroup) {
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| 52 | controlToFind = controlToFind.controls.hasOwnProperty(name) ?
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| 53 | controlToFind.controls[name] :
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| 54 | null;
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| 55 | }
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| 56 | else if (controlToFind instanceof FormArray) {
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| 57 | controlToFind = controlToFind.at(name) || null;
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| 58 | }
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| 59 | else {
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| 60 | controlToFind = null;
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| 61 | }
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| 62 | });
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| 63 | return controlToFind;
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| 64 | }
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| 65 | /**
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| 66 | * Gets validators from either an options object or given validators.
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| 67 | */
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| 68 | function pickValidators(validatorOrOpts) {
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| 69 | return (isOptionsObj(validatorOrOpts) ? validatorOrOpts.validators : validatorOrOpts) || null;
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| 70 | }
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| 71 | /**
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| 72 | * Creates validator function by combining provided validators.
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| 73 | */
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| 74 | function coerceToValidator(validator) {
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| 75 | return Array.isArray(validator) ? composeValidators(validator) : validator || null;
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| 76 | }
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| 77 | /**
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| 78 | * Gets async validators from either an options object or given validators.
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| 79 | */
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| 80 | function pickAsyncValidators(asyncValidator, validatorOrOpts) {
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| 81 | return (isOptionsObj(validatorOrOpts) ? validatorOrOpts.asyncValidators : asyncValidator) || null;
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| 82 | }
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| 83 | /**
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| 84 | * Creates async validator function by combining provided async validators.
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| 85 | */
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| 86 | function coerceToAsyncValidator(asyncValidator) {
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| 87 | return Array.isArray(asyncValidator) ? composeAsyncValidators(asyncValidator) :
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| 88 | asyncValidator || null;
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| 89 | }
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| 90 | function isOptionsObj(validatorOrOpts) {
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| 91 | return validatorOrOpts != null && !Array.isArray(validatorOrOpts) &&
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| 92 | typeof validatorOrOpts === 'object';
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| 93 | }
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| 94 | /**
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| 95 | * This is the base class for `FormControl`, `FormGroup`, and `FormArray`.
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| 96 | *
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| 97 | * It provides some of the shared behavior that all controls and groups of controls have, like
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| 98 | * running validators, calculating status, and resetting state. It also defines the properties
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| 99 | * that are shared between all sub-classes, like `value`, `valid`, and `dirty`. It shouldn't be
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| 100 | * instantiated directly.
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| 101 | *
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| 102 | * @see [Forms Guide](/guide/forms)
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| 103 | * @see [Reactive Forms Guide](/guide/reactive-forms)
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| 104 | * @see [Dynamic Forms Guide](/guide/dynamic-form)
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| 105 | *
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| 106 | * @publicApi
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| 107 | */
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| 108 | export class AbstractControl {
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| 109 | /**
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| 110 | * Initialize the AbstractControl instance.
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| 111 | *
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| 112 | * @param validators The function or array of functions that is used to determine the validity of
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| 113 | * this control synchronously.
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| 114 | * @param asyncValidators The function or array of functions that is used to determine validity of
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| 115 | * this control asynchronously.
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| 116 | */
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| 117 | constructor(validators, asyncValidators) {
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| 118 | /**
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| 119 | * Indicates that a control has its own pending asynchronous validation in progress.
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| 120 | *
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| 121 | * @internal
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| 122 | */
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| 123 | this._hasOwnPendingAsyncValidator = false;
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| 124 | /** @internal */
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| 125 | this._onCollectionChange = () => { };
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| 126 | this._parent = null;
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| 127 | /**
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| 128 | * A control is `pristine` if the user has not yet changed
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| 129 | * the value in the UI.
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| 130 | *
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| 131 | * @returns True if the user has not yet changed the value in the UI; compare `dirty`.
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| 132 | * Programmatic changes to a control's value do not mark it dirty.
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| 133 | */
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| 134 | this.pristine = true;
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| 135 | /**
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| 136 | * True if the control is marked as `touched`.
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| 137 | *
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| 138 | * A control is marked `touched` once the user has triggered
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| 139 | * a `blur` event on it.
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| 140 | */
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| 141 | this.touched = false;
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| 142 | /** @internal */
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| 143 | this._onDisabledChange = [];
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| 144 | this._rawValidators = validators;
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| 145 | this._rawAsyncValidators = asyncValidators;
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| 146 | this._composedValidatorFn = coerceToValidator(this._rawValidators);
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| 147 | this._composedAsyncValidatorFn = coerceToAsyncValidator(this._rawAsyncValidators);
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| 148 | }
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| 149 | /**
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| 150 | * Returns the function that is used to determine the validity of this control synchronously.
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| 151 | * If multiple validators have been added, this will be a single composed function.
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| 152 | * See `Validators.compose()` for additional information.
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| 153 | */
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| 154 | get validator() {
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| 155 | return this._composedValidatorFn;
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| 156 | }
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| 157 | set validator(validatorFn) {
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| 158 | this._rawValidators = this._composedValidatorFn = validatorFn;
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| 159 | }
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| 160 | /**
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| 161 | * Returns the function that is used to determine the validity of this control asynchronously.
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| 162 | * If multiple validators have been added, this will be a single composed function.
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| 163 | * See `Validators.compose()` for additional information.
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| 164 | */
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| 165 | get asyncValidator() {
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| 166 | return this._composedAsyncValidatorFn;
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| 167 | }
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| 168 | set asyncValidator(asyncValidatorFn) {
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| 169 | this._rawAsyncValidators = this._composedAsyncValidatorFn = asyncValidatorFn;
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| 170 | }
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| 171 | /**
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| 172 | * The parent control.
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| 173 | */
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| 174 | get parent() {
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| 175 | return this._parent;
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| 176 | }
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| 177 | /**
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| 178 | * A control is `valid` when its `status` is `VALID`.
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| 179 | *
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| 180 | * @see {@link AbstractControl.status}
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| 181 | *
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| 182 | * @returns True if the control has passed all of its validation tests,
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| 183 | * false otherwise.
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| 184 | */
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| 185 | get valid() {
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| 186 | return this.status === VALID;
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| 187 | }
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| 188 | /**
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| 189 | * A control is `invalid` when its `status` is `INVALID`.
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| 190 | *
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| 191 | * @see {@link AbstractControl.status}
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| 192 | *
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| 193 | * @returns True if this control has failed one or more of its validation checks,
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| 194 | * false otherwise.
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| 195 | */
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| 196 | get invalid() {
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| 197 | return this.status === INVALID;
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| 198 | }
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| 199 | /**
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| 200 | * A control is `pending` when its `status` is `PENDING`.
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| 201 | *
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| 202 | * @see {@link AbstractControl.status}
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| 203 | *
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| 204 | * @returns True if this control is in the process of conducting a validation check,
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| 205 | * false otherwise.
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| 206 | */
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| 207 | get pending() {
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| 208 | return this.status == PENDING;
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| 209 | }
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| 210 | /**
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| 211 | * A control is `disabled` when its `status` is `DISABLED`.
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| 212 | *
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| 213 | * Disabled controls are exempt from validation checks and
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| 214 | * are not included in the aggregate value of their ancestor
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| 215 | * controls.
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| 216 | *
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| 217 | * @see {@link AbstractControl.status}
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| 218 | *
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| 219 | * @returns True if the control is disabled, false otherwise.
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| 220 | */
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| 221 | get disabled() {
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| 222 | return this.status === DISABLED;
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| 223 | }
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| 224 | /**
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| 225 | * A control is `enabled` as long as its `status` is not `DISABLED`.
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| 226 | *
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| 227 | * @returns True if the control has any status other than 'DISABLED',
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| 228 | * false if the status is 'DISABLED'.
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| 229 | *
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| 230 | * @see {@link AbstractControl.status}
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| 231 | *
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| 232 | */
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| 233 | get enabled() {
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| 234 | return this.status !== DISABLED;
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| 235 | }
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| 236 | /**
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| 237 | * A control is `dirty` if the user has changed the value
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| 238 | * in the UI.
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| 239 | *
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| 240 | * @returns True if the user has changed the value of this control in the UI; compare `pristine`.
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| 241 | * Programmatic changes to a control's value do not mark it dirty.
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| 242 | */
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| 243 | get dirty() {
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| 244 | return !this.pristine;
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| 245 | }
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| 246 | /**
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| 247 | * True if the control has not been marked as touched
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| 248 | *
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| 249 | * A control is `untouched` if the user has not yet triggered
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| 250 | * a `blur` event on it.
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| 251 | */
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| 252 | get untouched() {
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| 253 | return !this.touched;
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| 254 | }
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| 255 | /**
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| 256 | * Reports the update strategy of the `AbstractControl` (meaning
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| 257 | * the event on which the control updates itself).
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| 258 | * Possible values: `'change'` | `'blur'` | `'submit'`
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| 259 | * Default value: `'change'`
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| 260 | */
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| 261 | get updateOn() {
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| 262 | return this._updateOn ? this._updateOn : (this.parent ? this.parent.updateOn : 'change');
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| 263 | }
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| 264 | /**
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| 265 | * Sets the synchronous validators that are active on this control. Calling
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| 266 | * this overwrites any existing synchronous validators.
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| 267 | *
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| 268 | * When you add or remove a validator at run time, you must call
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| 269 | * `updateValueAndValidity()` for the new validation to take effect.
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| 270 | *
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| 271 | * If you want to add a new validator without affecting existing ones, consider
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| 272 | * using `addValidators()` method instead.
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| 273 | */
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| 274 | setValidators(validators) {
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| 275 | this._rawValidators = validators;
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| 276 | this._composedValidatorFn = coerceToValidator(validators);
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| 277 | }
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| 278 | /**
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| 279 | * Sets the asynchronous validators that are active on this control. Calling this
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| 280 | * overwrites any existing asynchronous validators.
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| 281 | *
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| 282 | * When you add or remove a validator at run time, you must call
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| 283 | * `updateValueAndValidity()` for the new validation to take effect.
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| 284 | *
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| 285 | * If you want to add a new validator without affecting existing ones, consider
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| 286 | * using `addAsyncValidators()` method instead.
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| 287 | */
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| 288 | setAsyncValidators(validators) {
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| 289 | this._rawAsyncValidators = validators;
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| 290 | this._composedAsyncValidatorFn = coerceToAsyncValidator(validators);
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| 291 | }
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| 292 | /**
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| 293 | * Add a synchronous validator or validators to this control, without affecting other validators.
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| 294 | *
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| 295 | * When you add or remove a validator at run time, you must call
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| 296 | * `updateValueAndValidity()` for the new validation to take effect.
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| 297 | *
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| 298 | * Adding a validator that already exists will have no effect. If duplicate validator functions
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| 299 | * are present in the `validators` array, only the first instance would be added to a form
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| 300 | * control.
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| 301 | *
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| 302 | * @param validators The new validator function or functions to add to this control.
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| 303 | */
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| 304 | addValidators(validators) {
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| 305 | this.setValidators(addValidators(validators, this._rawValidators));
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| 306 | }
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| 307 | /**
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| 308 | * Add an asynchronous validator or validators to this control, without affecting other
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| 309 | * validators.
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| 310 | *
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| 311 | * When you add or remove a validator at run time, you must call
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| 312 | * `updateValueAndValidity()` for the new validation to take effect.
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| 313 | *
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| 314 | * Adding a validator that already exists will have no effect.
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| 315 | *
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| 316 | * @param validators The new asynchronous validator function or functions to add to this control.
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| 317 | */
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| 318 | addAsyncValidators(validators) {
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| 319 | this.setAsyncValidators(addValidators(validators, this._rawAsyncValidators));
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| 320 | }
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| 321 | /**
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| 322 | * Remove a synchronous validator from this control, without affecting other validators.
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| 323 | * Validators are compared by function reference; you must pass a reference to the exact same
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| 324 | * validator function as the one that was originally set. If a provided validator is not found,
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| 325 | * it is ignored.
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| 326 | *
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| 327 | * When you add or remove a validator at run time, you must call
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| 328 | * `updateValueAndValidity()` for the new validation to take effect.
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| 329 | *
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| 330 | * @param validators The validator or validators to remove.
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| 331 | */
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| 332 | removeValidators(validators) {
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| 333 | this.setValidators(removeValidators(validators, this._rawValidators));
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| 334 | }
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| 335 | /**
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| 336 | * Remove an asynchronous validator from this control, without affecting other validators.
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| 337 | * Validators are compared by function reference; you must pass a reference to the exact same
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| 338 | * validator function as the one that was originally set. If a provided validator is not found, it
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| 339 | * is ignored.
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| 340 | *
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| 341 | * When you add or remove a validator at run time, you must call
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| 342 | * `updateValueAndValidity()` for the new validation to take effect.
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| 343 | *
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| 344 | * @param validators The asynchronous validator or validators to remove.
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| 345 | */
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| 346 | removeAsyncValidators(validators) {
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| 347 | this.setAsyncValidators(removeValidators(validators, this._rawAsyncValidators));
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| 348 | }
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| 349 | /**
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| 350 | * Check whether a synchronous validator function is present on this control. The provided
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| 351 | * validator must be a reference to the exact same function that was provided.
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| 352 | *
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| 353 | * @param validator The validator to check for presence. Compared by function reference.
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| 354 | * @returns Whether the provided validator was found on this control.
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| 355 | */
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| 356 | hasValidator(validator) {
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| 357 | return hasValidator(this._rawValidators, validator);
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| 358 | }
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| 359 | /**
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| 360 | * Check whether an asynchronous validator function is present on this control. The provided
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| 361 | * validator must be a reference to the exact same function that was provided.
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| 362 | *
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| 363 | * @param validator The asynchronous validator to check for presence. Compared by function
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| 364 | * reference.
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| 365 | * @returns Whether the provided asynchronous validator was found on this control.
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| 366 | */
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| 367 | hasAsyncValidator(validator) {
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| 368 | return hasValidator(this._rawAsyncValidators, validator);
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| 369 | }
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| 370 | /**
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| 371 | * Empties out the synchronous validator list.
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| 372 | *
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| 373 | * When you add or remove a validator at run time, you must call
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| 374 | * `updateValueAndValidity()` for the new validation to take effect.
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| 375 | *
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| 376 | */
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| 377 | clearValidators() {
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| 378 | this.validator = null;
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| 379 | }
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| 380 | /**
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| 381 | * Empties out the async validator list.
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| 382 | *
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| 383 | * When you add or remove a validator at run time, you must call
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| 384 | * `updateValueAndValidity()` for the new validation to take effect.
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| 385 | *
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| 386 | */
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| 387 | clearAsyncValidators() {
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| 388 | this.asyncValidator = null;
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| 389 | }
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| 390 | /**
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| 391 | * Marks the control as `touched`. A control is touched by focus and
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| 392 | * blur events that do not change the value.
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| 393 | *
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| 394 | * @see `markAsUntouched()`
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| 395 | * @see `markAsDirty()`
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| 396 | * @see `markAsPristine()`
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| 397 | *
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| 398 | * @param opts Configuration options that determine how the control propagates changes
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| 399 | * and emits events after marking is applied.
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| 400 | * * `onlySelf`: When true, mark only this control. When false or not supplied,
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| 401 | * marks all direct ancestors. Default is false.
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| 402 | */
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| 403 | markAsTouched(opts = {}) {
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| 404 | this.touched = true;
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| 405 | if (this._parent && !opts.onlySelf) {
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| 406 | this._parent.markAsTouched(opts);
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| 407 | }
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| 408 | }
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| 409 | /**
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| 410 | * Marks the control and all its descendant controls as `touched`.
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| 411 | * @see `markAsTouched()`
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| 412 | */
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| 413 | markAllAsTouched() {
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| 414 | this.markAsTouched({ onlySelf: true });
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| 415 | this._forEachChild((control) => control.markAllAsTouched());
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| 416 | }
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| 417 | /**
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| 418 | * Marks the control as `untouched`.
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| 419 | *
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| 420 | * If the control has any children, also marks all children as `untouched`
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| 421 | * and recalculates the `touched` status of all parent controls.
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| 422 | *
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| 423 | * @see `markAsTouched()`
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| 424 | * @see `markAsDirty()`
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| 425 | * @see `markAsPristine()`
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| 426 | *
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| 427 | * @param opts Configuration options that determine how the control propagates changes
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| 428 | * and emits events after the marking is applied.
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| 429 | * * `onlySelf`: When true, mark only this control. When false or not supplied,
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| 430 | * marks all direct ancestors. Default is false.
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| 431 | */
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| 432 | markAsUntouched(opts = {}) {
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| 433 | this.touched = false;
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| 434 | this._pendingTouched = false;
|
---|
| 435 | this._forEachChild((control) => {
|
---|
| 436 | control.markAsUntouched({ onlySelf: true });
|
---|
| 437 | });
|
---|
| 438 | if (this._parent && !opts.onlySelf) {
|
---|
| 439 | this._parent._updateTouched(opts);
|
---|
| 440 | }
|
---|
| 441 | }
|
---|
| 442 | /**
|
---|
| 443 | * Marks the control as `dirty`. A control becomes dirty when
|
---|
| 444 | * the control's value is changed through the UI; compare `markAsTouched`.
|
---|
| 445 | *
|
---|
| 446 | * @see `markAsTouched()`
|
---|
| 447 | * @see `markAsUntouched()`
|
---|
| 448 | * @see `markAsPristine()`
|
---|
| 449 | *
|
---|
| 450 | * @param opts Configuration options that determine how the control propagates changes
|
---|
| 451 | * and emits events after marking is applied.
|
---|
| 452 | * * `onlySelf`: When true, mark only this control. When false or not supplied,
|
---|
| 453 | * marks all direct ancestors. Default is false.
|
---|
| 454 | */
|
---|
| 455 | markAsDirty(opts = {}) {
|
---|
| 456 | this.pristine = false;
|
---|
| 457 | if (this._parent && !opts.onlySelf) {
|
---|
| 458 | this._parent.markAsDirty(opts);
|
---|
| 459 | }
|
---|
| 460 | }
|
---|
| 461 | /**
|
---|
| 462 | * Marks the control as `pristine`.
|
---|
| 463 | *
|
---|
| 464 | * If the control has any children, marks all children as `pristine`,
|
---|
| 465 | * and recalculates the `pristine` status of all parent
|
---|
| 466 | * controls.
|
---|
| 467 | *
|
---|
| 468 | * @see `markAsTouched()`
|
---|
| 469 | * @see `markAsUntouched()`
|
---|
| 470 | * @see `markAsDirty()`
|
---|
| 471 | *
|
---|
| 472 | * @param opts Configuration options that determine how the control emits events after
|
---|
| 473 | * marking is applied.
|
---|
| 474 | * * `onlySelf`: When true, mark only this control. When false or not supplied,
|
---|
| 475 | * marks all direct ancestors. Default is false.
|
---|
| 476 | */
|
---|
| 477 | markAsPristine(opts = {}) {
|
---|
| 478 | this.pristine = true;
|
---|
| 479 | this._pendingDirty = false;
|
---|
| 480 | this._forEachChild((control) => {
|
---|
| 481 | control.markAsPristine({ onlySelf: true });
|
---|
| 482 | });
|
---|
| 483 | if (this._parent && !opts.onlySelf) {
|
---|
| 484 | this._parent._updatePristine(opts);
|
---|
| 485 | }
|
---|
| 486 | }
|
---|
| 487 | /**
|
---|
| 488 | * Marks the control as `pending`.
|
---|
| 489 | *
|
---|
| 490 | * A control is pending while the control performs async validation.
|
---|
| 491 | *
|
---|
| 492 | * @see {@link AbstractControl.status}
|
---|
| 493 | *
|
---|
| 494 | * @param opts Configuration options that determine how the control propagates changes and
|
---|
| 495 | * emits events after marking is applied.
|
---|
| 496 | * * `onlySelf`: When true, mark only this control. When false or not supplied,
|
---|
| 497 | * marks all direct ancestors. Default is false.
|
---|
| 498 | * * `emitEvent`: When true or not supplied (the default), the `statusChanges`
|
---|
| 499 | * observable emits an event with the latest status the control is marked pending.
|
---|
| 500 | * When false, no events are emitted.
|
---|
| 501 | *
|
---|
| 502 | */
|
---|
| 503 | markAsPending(opts = {}) {
|
---|
| 504 | this.status = PENDING;
|
---|
| 505 | if (opts.emitEvent !== false) {
|
---|
| 506 | this.statusChanges.emit(this.status);
|
---|
| 507 | }
|
---|
| 508 | if (this._parent && !opts.onlySelf) {
|
---|
| 509 | this._parent.markAsPending(opts);
|
---|
| 510 | }
|
---|
| 511 | }
|
---|
| 512 | /**
|
---|
| 513 | * Disables the control. This means the control is exempt from validation checks and
|
---|
| 514 | * excluded from the aggregate value of any parent. Its status is `DISABLED`.
|
---|
| 515 | *
|
---|
| 516 | * If the control has children, all children are also disabled.
|
---|
| 517 | *
|
---|
| 518 | * @see {@link AbstractControl.status}
|
---|
| 519 | *
|
---|
| 520 | * @param opts Configuration options that determine how the control propagates
|
---|
| 521 | * changes and emits events after the control is disabled.
|
---|
| 522 | * * `onlySelf`: When true, mark only this control. When false or not supplied,
|
---|
| 523 | * marks all direct ancestors. Default is false.
|
---|
| 524 | * * `emitEvent`: When true or not supplied (the default), both the `statusChanges` and
|
---|
| 525 | * `valueChanges`
|
---|
| 526 | * observables emit events with the latest status and value when the control is disabled.
|
---|
| 527 | * When false, no events are emitted.
|
---|
| 528 | */
|
---|
| 529 | disable(opts = {}) {
|
---|
| 530 | // If parent has been marked artificially dirty we don't want to re-calculate the
|
---|
| 531 | // parent's dirtiness based on the children.
|
---|
| 532 | const skipPristineCheck = this._parentMarkedDirty(opts.onlySelf);
|
---|
| 533 | this.status = DISABLED;
|
---|
| 534 | this.errors = null;
|
---|
| 535 | this._forEachChild((control) => {
|
---|
| 536 | control.disable(Object.assign(Object.assign({}, opts), { onlySelf: true }));
|
---|
| 537 | });
|
---|
| 538 | this._updateValue();
|
---|
| 539 | if (opts.emitEvent !== false) {
|
---|
| 540 | this.valueChanges.emit(this.value);
|
---|
| 541 | this.statusChanges.emit(this.status);
|
---|
| 542 | }
|
---|
| 543 | this._updateAncestors(Object.assign(Object.assign({}, opts), { skipPristineCheck }));
|
---|
| 544 | this._onDisabledChange.forEach((changeFn) => changeFn(true));
|
---|
| 545 | }
|
---|
| 546 | /**
|
---|
| 547 | * Enables the control. This means the control is included in validation checks and
|
---|
| 548 | * the aggregate value of its parent. Its status recalculates based on its value and
|
---|
| 549 | * its validators.
|
---|
| 550 | *
|
---|
| 551 | * By default, if the control has children, all children are enabled.
|
---|
| 552 | *
|
---|
| 553 | * @see {@link AbstractControl.status}
|
---|
| 554 | *
|
---|
| 555 | * @param opts Configure options that control how the control propagates changes and
|
---|
| 556 | * emits events when marked as untouched
|
---|
| 557 | * * `onlySelf`: When true, mark only this control. When false or not supplied,
|
---|
| 558 | * marks all direct ancestors. Default is false.
|
---|
| 559 | * * `emitEvent`: When true or not supplied (the default), both the `statusChanges` and
|
---|
| 560 | * `valueChanges`
|
---|
| 561 | * observables emit events with the latest status and value when the control is enabled.
|
---|
| 562 | * When false, no events are emitted.
|
---|
| 563 | */
|
---|
| 564 | enable(opts = {}) {
|
---|
| 565 | // If parent has been marked artificially dirty we don't want to re-calculate the
|
---|
| 566 | // parent's dirtiness based on the children.
|
---|
| 567 | const skipPristineCheck = this._parentMarkedDirty(opts.onlySelf);
|
---|
| 568 | this.status = VALID;
|
---|
| 569 | this._forEachChild((control) => {
|
---|
| 570 | control.enable(Object.assign(Object.assign({}, opts), { onlySelf: true }));
|
---|
| 571 | });
|
---|
| 572 | this.updateValueAndValidity({ onlySelf: true, emitEvent: opts.emitEvent });
|
---|
| 573 | this._updateAncestors(Object.assign(Object.assign({}, opts), { skipPristineCheck }));
|
---|
| 574 | this._onDisabledChange.forEach((changeFn) => changeFn(false));
|
---|
| 575 | }
|
---|
| 576 | _updateAncestors(opts) {
|
---|
| 577 | if (this._parent && !opts.onlySelf) {
|
---|
| 578 | this._parent.updateValueAndValidity(opts);
|
---|
| 579 | if (!opts.skipPristineCheck) {
|
---|
| 580 | this._parent._updatePristine();
|
---|
| 581 | }
|
---|
| 582 | this._parent._updateTouched();
|
---|
| 583 | }
|
---|
| 584 | }
|
---|
| 585 | /**
|
---|
| 586 | * @param parent Sets the parent of the control
|
---|
| 587 | */
|
---|
| 588 | setParent(parent) {
|
---|
| 589 | this._parent = parent;
|
---|
| 590 | }
|
---|
| 591 | /**
|
---|
| 592 | * Recalculates the value and validation status of the control.
|
---|
| 593 | *
|
---|
| 594 | * By default, it also updates the value and validity of its ancestors.
|
---|
| 595 | *
|
---|
| 596 | * @param opts Configuration options determine how the control propagates changes and emits events
|
---|
| 597 | * after updates and validity checks are applied.
|
---|
| 598 | * * `onlySelf`: When true, only update this control. When false or not supplied,
|
---|
| 599 | * update all direct ancestors. Default is false.
|
---|
| 600 | * * `emitEvent`: When true or not supplied (the default), both the `statusChanges` and
|
---|
| 601 | * `valueChanges`
|
---|
| 602 | * observables emit events with the latest status and value when the control is updated.
|
---|
| 603 | * When false, no events are emitted.
|
---|
| 604 | */
|
---|
| 605 | updateValueAndValidity(opts = {}) {
|
---|
| 606 | this._setInitialStatus();
|
---|
| 607 | this._updateValue();
|
---|
| 608 | if (this.enabled) {
|
---|
| 609 | this._cancelExistingSubscription();
|
---|
| 610 | this.errors = this._runValidator();
|
---|
| 611 | this.status = this._calculateStatus();
|
---|
| 612 | if (this.status === VALID || this.status === PENDING) {
|
---|
| 613 | this._runAsyncValidator(opts.emitEvent);
|
---|
| 614 | }
|
---|
| 615 | }
|
---|
| 616 | if (opts.emitEvent !== false) {
|
---|
| 617 | this.valueChanges.emit(this.value);
|
---|
| 618 | this.statusChanges.emit(this.status);
|
---|
| 619 | }
|
---|
| 620 | if (this._parent && !opts.onlySelf) {
|
---|
| 621 | this._parent.updateValueAndValidity(opts);
|
---|
| 622 | }
|
---|
| 623 | }
|
---|
| 624 | /** @internal */
|
---|
| 625 | _updateTreeValidity(opts = { emitEvent: true }) {
|
---|
| 626 | this._forEachChild((ctrl) => ctrl._updateTreeValidity(opts));
|
---|
| 627 | this.updateValueAndValidity({ onlySelf: true, emitEvent: opts.emitEvent });
|
---|
| 628 | }
|
---|
| 629 | _setInitialStatus() {
|
---|
| 630 | this.status = this._allControlsDisabled() ? DISABLED : VALID;
|
---|
| 631 | }
|
---|
| 632 | _runValidator() {
|
---|
| 633 | return this.validator ? this.validator(this) : null;
|
---|
| 634 | }
|
---|
| 635 | _runAsyncValidator(emitEvent) {
|
---|
| 636 | if (this.asyncValidator) {
|
---|
| 637 | this.status = PENDING;
|
---|
| 638 | this._hasOwnPendingAsyncValidator = true;
|
---|
| 639 | const obs = toObservable(this.asyncValidator(this));
|
---|
| 640 | this._asyncValidationSubscription = obs.subscribe((errors) => {
|
---|
| 641 | this._hasOwnPendingAsyncValidator = false;
|
---|
| 642 | // This will trigger the recalculation of the validation status, which depends on
|
---|
| 643 | // the state of the asynchronous validation (whether it is in progress or not). So, it is
|
---|
| 644 | // necessary that we have updated the `_hasOwnPendingAsyncValidator` boolean flag first.
|
---|
| 645 | this.setErrors(errors, { emitEvent });
|
---|
| 646 | });
|
---|
| 647 | }
|
---|
| 648 | }
|
---|
| 649 | _cancelExistingSubscription() {
|
---|
| 650 | if (this._asyncValidationSubscription) {
|
---|
| 651 | this._asyncValidationSubscription.unsubscribe();
|
---|
| 652 | this._hasOwnPendingAsyncValidator = false;
|
---|
| 653 | }
|
---|
| 654 | }
|
---|
| 655 | /**
|
---|
| 656 | * Sets errors on a form control when running validations manually, rather than automatically.
|
---|
| 657 | *
|
---|
| 658 | * Calling `setErrors` also updates the validity of the parent control.
|
---|
| 659 | *
|
---|
| 660 | * @usageNotes
|
---|
| 661 | *
|
---|
| 662 | * ### Manually set the errors for a control
|
---|
| 663 | *
|
---|
| 664 | * ```
|
---|
| 665 | * const login = new FormControl('someLogin');
|
---|
| 666 | * login.setErrors({
|
---|
| 667 | * notUnique: true
|
---|
| 668 | * });
|
---|
| 669 | *
|
---|
| 670 | * expect(login.valid).toEqual(false);
|
---|
| 671 | * expect(login.errors).toEqual({ notUnique: true });
|
---|
| 672 | *
|
---|
| 673 | * login.setValue('someOtherLogin');
|
---|
| 674 | *
|
---|
| 675 | * expect(login.valid).toEqual(true);
|
---|
| 676 | * ```
|
---|
| 677 | */
|
---|
| 678 | setErrors(errors, opts = {}) {
|
---|
| 679 | this.errors = errors;
|
---|
| 680 | this._updateControlsErrors(opts.emitEvent !== false);
|
---|
| 681 | }
|
---|
| 682 | /**
|
---|
| 683 | * Retrieves a child control given the control's name or path.
|
---|
| 684 | *
|
---|
| 685 | * @param path A dot-delimited string or array of string/number values that define the path to the
|
---|
| 686 | * control.
|
---|
| 687 | *
|
---|
| 688 | * @usageNotes
|
---|
| 689 | * ### Retrieve a nested control
|
---|
| 690 | *
|
---|
| 691 | * For example, to get a `name` control nested within a `person` sub-group:
|
---|
| 692 | *
|
---|
| 693 | * * `this.form.get('person.name');`
|
---|
| 694 | *
|
---|
| 695 | * -OR-
|
---|
| 696 | *
|
---|
| 697 | * * `this.form.get(['person', 'name']);`
|
---|
| 698 | *
|
---|
| 699 | * ### Retrieve a control in a FormArray
|
---|
| 700 | *
|
---|
| 701 | * When accessing an element inside a FormArray, you can use an element index.
|
---|
| 702 | * For example, to get a `price` control from the first element in an `items` array you can use:
|
---|
| 703 | *
|
---|
| 704 | * * `this.form.get('items.0.price');`
|
---|
| 705 | *
|
---|
| 706 | * -OR-
|
---|
| 707 | *
|
---|
| 708 | * * `this.form.get(['items', 0, 'price']);`
|
---|
| 709 | */
|
---|
| 710 | get(path) {
|
---|
| 711 | return _find(this, path, '.');
|
---|
| 712 | }
|
---|
| 713 | /**
|
---|
| 714 | * @description
|
---|
| 715 | * Reports error data for the control with the given path.
|
---|
| 716 | *
|
---|
| 717 | * @param errorCode The code of the error to check
|
---|
| 718 | * @param path A list of control names that designates how to move from the current control
|
---|
| 719 | * to the control that should be queried for errors.
|
---|
| 720 | *
|
---|
| 721 | * @usageNotes
|
---|
| 722 | * For example, for the following `FormGroup`:
|
---|
| 723 | *
|
---|
| 724 | * ```
|
---|
| 725 | * form = new FormGroup({
|
---|
| 726 | * address: new FormGroup({ street: new FormControl() })
|
---|
| 727 | * });
|
---|
| 728 | * ```
|
---|
| 729 | *
|
---|
| 730 | * The path to the 'street' control from the root form would be 'address' -> 'street'.
|
---|
| 731 | *
|
---|
| 732 | * It can be provided to this method in one of two formats:
|
---|
| 733 | *
|
---|
| 734 | * 1. An array of string control names, e.g. `['address', 'street']`
|
---|
| 735 | * 1. A period-delimited list of control names in one string, e.g. `'address.street'`
|
---|
| 736 | *
|
---|
| 737 | * @returns error data for that particular error. If the control or error is not present,
|
---|
| 738 | * null is returned.
|
---|
| 739 | */
|
---|
| 740 | getError(errorCode, path) {
|
---|
| 741 | const control = path ? this.get(path) : this;
|
---|
| 742 | return control && control.errors ? control.errors[errorCode] : null;
|
---|
| 743 | }
|
---|
| 744 | /**
|
---|
| 745 | * @description
|
---|
| 746 | * Reports whether the control with the given path has the error specified.
|
---|
| 747 | *
|
---|
| 748 | * @param errorCode The code of the error to check
|
---|
| 749 | * @param path A list of control names that designates how to move from the current control
|
---|
| 750 | * to the control that should be queried for errors.
|
---|
| 751 | *
|
---|
| 752 | * @usageNotes
|
---|
| 753 | * For example, for the following `FormGroup`:
|
---|
| 754 | *
|
---|
| 755 | * ```
|
---|
| 756 | * form = new FormGroup({
|
---|
| 757 | * address: new FormGroup({ street: new FormControl() })
|
---|
| 758 | * });
|
---|
| 759 | * ```
|
---|
| 760 | *
|
---|
| 761 | * The path to the 'street' control from the root form would be 'address' -> 'street'.
|
---|
| 762 | *
|
---|
| 763 | * It can be provided to this method in one of two formats:
|
---|
| 764 | *
|
---|
| 765 | * 1. An array of string control names, e.g. `['address', 'street']`
|
---|
| 766 | * 1. A period-delimited list of control names in one string, e.g. `'address.street'`
|
---|
| 767 | *
|
---|
| 768 | * If no path is given, this method checks for the error on the current control.
|
---|
| 769 | *
|
---|
| 770 | * @returns whether the given error is present in the control at the given path.
|
---|
| 771 | *
|
---|
| 772 | * If the control is not present, false is returned.
|
---|
| 773 | */
|
---|
| 774 | hasError(errorCode, path) {
|
---|
| 775 | return !!this.getError(errorCode, path);
|
---|
| 776 | }
|
---|
| 777 | /**
|
---|
| 778 | * Retrieves the top-level ancestor of this control.
|
---|
| 779 | */
|
---|
| 780 | get root() {
|
---|
| 781 | let x = this;
|
---|
| 782 | while (x._parent) {
|
---|
| 783 | x = x._parent;
|
---|
| 784 | }
|
---|
| 785 | return x;
|
---|
| 786 | }
|
---|
| 787 | /** @internal */
|
---|
| 788 | _updateControlsErrors(emitEvent) {
|
---|
| 789 | this.status = this._calculateStatus();
|
---|
| 790 | if (emitEvent) {
|
---|
| 791 | this.statusChanges.emit(this.status);
|
---|
| 792 | }
|
---|
| 793 | if (this._parent) {
|
---|
| 794 | this._parent._updateControlsErrors(emitEvent);
|
---|
| 795 | }
|
---|
| 796 | }
|
---|
| 797 | /** @internal */
|
---|
| 798 | _initObservables() {
|
---|
| 799 | this.valueChanges = new EventEmitter();
|
---|
| 800 | this.statusChanges = new EventEmitter();
|
---|
| 801 | }
|
---|
| 802 | _calculateStatus() {
|
---|
| 803 | if (this._allControlsDisabled())
|
---|
| 804 | return DISABLED;
|
---|
| 805 | if (this.errors)
|
---|
| 806 | return INVALID;
|
---|
| 807 | if (this._hasOwnPendingAsyncValidator || this._anyControlsHaveStatus(PENDING))
|
---|
| 808 | return PENDING;
|
---|
| 809 | if (this._anyControlsHaveStatus(INVALID))
|
---|
| 810 | return INVALID;
|
---|
| 811 | return VALID;
|
---|
| 812 | }
|
---|
| 813 | /** @internal */
|
---|
| 814 | _anyControlsHaveStatus(status) {
|
---|
| 815 | return this._anyControls((control) => control.status === status);
|
---|
| 816 | }
|
---|
| 817 | /** @internal */
|
---|
| 818 | _anyControlsDirty() {
|
---|
| 819 | return this._anyControls((control) => control.dirty);
|
---|
| 820 | }
|
---|
| 821 | /** @internal */
|
---|
| 822 | _anyControlsTouched() {
|
---|
| 823 | return this._anyControls((control) => control.touched);
|
---|
| 824 | }
|
---|
| 825 | /** @internal */
|
---|
| 826 | _updatePristine(opts = {}) {
|
---|
| 827 | this.pristine = !this._anyControlsDirty();
|
---|
| 828 | if (this._parent && !opts.onlySelf) {
|
---|
| 829 | this._parent._updatePristine(opts);
|
---|
| 830 | }
|
---|
| 831 | }
|
---|
| 832 | /** @internal */
|
---|
| 833 | _updateTouched(opts = {}) {
|
---|
| 834 | this.touched = this._anyControlsTouched();
|
---|
| 835 | if (this._parent && !opts.onlySelf) {
|
---|
| 836 | this._parent._updateTouched(opts);
|
---|
| 837 | }
|
---|
| 838 | }
|
---|
| 839 | /** @internal */
|
---|
| 840 | _isBoxedValue(formState) {
|
---|
| 841 | return typeof formState === 'object' && formState !== null &&
|
---|
| 842 | Object.keys(formState).length === 2 && 'value' in formState && 'disabled' in formState;
|
---|
| 843 | }
|
---|
| 844 | /** @internal */
|
---|
| 845 | _registerOnCollectionChange(fn) {
|
---|
| 846 | this._onCollectionChange = fn;
|
---|
| 847 | }
|
---|
| 848 | /** @internal */
|
---|
| 849 | _setUpdateStrategy(opts) {
|
---|
| 850 | if (isOptionsObj(opts) && opts.updateOn != null) {
|
---|
| 851 | this._updateOn = opts.updateOn;
|
---|
| 852 | }
|
---|
| 853 | }
|
---|
| 854 | /**
|
---|
| 855 | * Check to see if parent has been marked artificially dirty.
|
---|
| 856 | *
|
---|
| 857 | * @internal
|
---|
| 858 | */
|
---|
| 859 | _parentMarkedDirty(onlySelf) {
|
---|
| 860 | const parentDirty = this._parent && this._parent.dirty;
|
---|
| 861 | return !onlySelf && !!parentDirty && !this._parent._anyControlsDirty();
|
---|
| 862 | }
|
---|
| 863 | }
|
---|
| 864 | /**
|
---|
| 865 | * Tracks the value and validation status of an individual form control.
|
---|
| 866 | *
|
---|
| 867 | * This is one of the three fundamental building blocks of Angular forms, along with
|
---|
| 868 | * `FormGroup` and `FormArray`. It extends the `AbstractControl` class that
|
---|
| 869 | * implements most of the base functionality for accessing the value, validation status,
|
---|
| 870 | * user interactions and events. See [usage examples below](#usage-notes).
|
---|
| 871 | *
|
---|
| 872 | * @see `AbstractControl`
|
---|
| 873 | * @see [Reactive Forms Guide](guide/reactive-forms)
|
---|
| 874 | * @see [Usage Notes](#usage-notes)
|
---|
| 875 | *
|
---|
| 876 | * @usageNotes
|
---|
| 877 | *
|
---|
| 878 | * ### Initializing Form Controls
|
---|
| 879 | *
|
---|
| 880 | * Instantiate a `FormControl`, with an initial value.
|
---|
| 881 | *
|
---|
| 882 | * ```ts
|
---|
| 883 | * const control = new FormControl('some value');
|
---|
| 884 | * console.log(control.value); // 'some value'
|
---|
| 885 | *```
|
---|
| 886 | *
|
---|
| 887 | * The following example initializes the control with a form state object. The `value`
|
---|
| 888 | * and `disabled` keys are required in this case.
|
---|
| 889 | *
|
---|
| 890 | * ```ts
|
---|
| 891 | * const control = new FormControl({ value: 'n/a', disabled: true });
|
---|
| 892 | * console.log(control.value); // 'n/a'
|
---|
| 893 | * console.log(control.status); // 'DISABLED'
|
---|
| 894 | * ```
|
---|
| 895 | *
|
---|
| 896 | * The following example initializes the control with a synchronous validator.
|
---|
| 897 | *
|
---|
| 898 | * ```ts
|
---|
| 899 | * const control = new FormControl('', Validators.required);
|
---|
| 900 | * console.log(control.value); // ''
|
---|
| 901 | * console.log(control.status); // 'INVALID'
|
---|
| 902 | * ```
|
---|
| 903 | *
|
---|
| 904 | * The following example initializes the control using an options object.
|
---|
| 905 | *
|
---|
| 906 | * ```ts
|
---|
| 907 | * const control = new FormControl('', {
|
---|
| 908 | * validators: Validators.required,
|
---|
| 909 | * asyncValidators: myAsyncValidator
|
---|
| 910 | * });
|
---|
| 911 | * ```
|
---|
| 912 | *
|
---|
| 913 | * ### Configure the control to update on a blur event
|
---|
| 914 | *
|
---|
| 915 | * Set the `updateOn` option to `'blur'` to update on the blur `event`.
|
---|
| 916 | *
|
---|
| 917 | * ```ts
|
---|
| 918 | * const control = new FormControl('', { updateOn: 'blur' });
|
---|
| 919 | * ```
|
---|
| 920 | *
|
---|
| 921 | * ### Configure the control to update on a submit event
|
---|
| 922 | *
|
---|
| 923 | * Set the `updateOn` option to `'submit'` to update on a submit `event`.
|
---|
| 924 | *
|
---|
| 925 | * ```ts
|
---|
| 926 | * const control = new FormControl('', { updateOn: 'submit' });
|
---|
| 927 | * ```
|
---|
| 928 | *
|
---|
| 929 | * ### Reset the control back to an initial value
|
---|
| 930 | *
|
---|
| 931 | * You reset to a specific form state by passing through a standalone
|
---|
| 932 | * value or a form state object that contains both a value and a disabled state
|
---|
| 933 | * (these are the only two properties that cannot be calculated).
|
---|
| 934 | *
|
---|
| 935 | * ```ts
|
---|
| 936 | * const control = new FormControl('Nancy');
|
---|
| 937 | *
|
---|
| 938 | * console.log(control.value); // 'Nancy'
|
---|
| 939 | *
|
---|
| 940 | * control.reset('Drew');
|
---|
| 941 | *
|
---|
| 942 | * console.log(control.value); // 'Drew'
|
---|
| 943 | * ```
|
---|
| 944 | *
|
---|
| 945 | * ### Reset the control back to an initial value and disabled
|
---|
| 946 | *
|
---|
| 947 | * ```
|
---|
| 948 | * const control = new FormControl('Nancy');
|
---|
| 949 | *
|
---|
| 950 | * console.log(control.value); // 'Nancy'
|
---|
| 951 | * console.log(control.status); // 'VALID'
|
---|
| 952 | *
|
---|
| 953 | * control.reset({ value: 'Drew', disabled: true });
|
---|
| 954 | *
|
---|
| 955 | * console.log(control.value); // 'Drew'
|
---|
| 956 | * console.log(control.status); // 'DISABLED'
|
---|
| 957 | * ```
|
---|
| 958 | *
|
---|
| 959 | * @publicApi
|
---|
| 960 | */
|
---|
| 961 | export class FormControl extends AbstractControl {
|
---|
| 962 | /**
|
---|
| 963 | * Creates a new `FormControl` instance.
|
---|
| 964 | *
|
---|
| 965 | * @param formState Initializes the control with an initial value,
|
---|
| 966 | * or an object that defines the initial value and disabled state.
|
---|
| 967 | *
|
---|
| 968 | * @param validatorOrOpts A synchronous validator function, or an array of
|
---|
| 969 | * such functions, or an `AbstractControlOptions` object that contains validation functions
|
---|
| 970 | * and a validation trigger.
|
---|
| 971 | *
|
---|
| 972 | * @param asyncValidator A single async validator or array of async validator functions
|
---|
| 973 | *
|
---|
| 974 | */
|
---|
| 975 | constructor(formState = null, validatorOrOpts, asyncValidator) {
|
---|
| 976 | super(pickValidators(validatorOrOpts), pickAsyncValidators(asyncValidator, validatorOrOpts));
|
---|
| 977 | /** @internal */
|
---|
| 978 | this._onChange = [];
|
---|
| 979 | this._applyFormState(formState);
|
---|
| 980 | this._setUpdateStrategy(validatorOrOpts);
|
---|
| 981 | this._initObservables();
|
---|
| 982 | this.updateValueAndValidity({
|
---|
| 983 | onlySelf: true,
|
---|
| 984 | // If `asyncValidator` is present, it will trigger control status change from `PENDING` to
|
---|
| 985 | // `VALID` or `INVALID`.
|
---|
| 986 | // The status should be broadcasted via the `statusChanges` observable, so we set `emitEvent`
|
---|
| 987 | // to `true` to allow that during the control creation process.
|
---|
| 988 | emitEvent: !!this.asyncValidator
|
---|
| 989 | });
|
---|
| 990 | }
|
---|
| 991 | /**
|
---|
| 992 | * Sets a new value for the form control.
|
---|
| 993 | *
|
---|
| 994 | * @param value The new value for the control.
|
---|
| 995 | * @param options Configuration options that determine how the control propagates changes
|
---|
| 996 | * and emits events when the value changes.
|
---|
| 997 | * The configuration options are passed to the {@link AbstractControl#updateValueAndValidity
|
---|
| 998 | * updateValueAndValidity} method.
|
---|
| 999 | *
|
---|
| 1000 | * * `onlySelf`: When true, each change only affects this control, and not its parent. Default is
|
---|
| 1001 | * false.
|
---|
| 1002 | * * `emitEvent`: When true or not supplied (the default), both the `statusChanges` and
|
---|
| 1003 | * `valueChanges`
|
---|
| 1004 | * observables emit events with the latest status and value when the control value is updated.
|
---|
| 1005 | * When false, no events are emitted.
|
---|
| 1006 | * * `emitModelToViewChange`: When true or not supplied (the default), each change triggers an
|
---|
| 1007 | * `onChange` event to
|
---|
| 1008 | * update the view.
|
---|
| 1009 | * * `emitViewToModelChange`: When true or not supplied (the default), each change triggers an
|
---|
| 1010 | * `ngModelChange`
|
---|
| 1011 | * event to update the model.
|
---|
| 1012 | *
|
---|
| 1013 | */
|
---|
| 1014 | setValue(value, options = {}) {
|
---|
| 1015 | this.value = this._pendingValue = value;
|
---|
| 1016 | if (this._onChange.length && options.emitModelToViewChange !== false) {
|
---|
| 1017 | this._onChange.forEach((changeFn) => changeFn(this.value, options.emitViewToModelChange !== false));
|
---|
| 1018 | }
|
---|
| 1019 | this.updateValueAndValidity(options);
|
---|
| 1020 | }
|
---|
| 1021 | /**
|
---|
| 1022 | * Patches the value of a control.
|
---|
| 1023 | *
|
---|
| 1024 | * This function is functionally the same as {@link FormControl#setValue setValue} at this level.
|
---|
| 1025 | * It exists for symmetry with {@link FormGroup#patchValue patchValue} on `FormGroups` and
|
---|
| 1026 | * `FormArrays`, where it does behave differently.
|
---|
| 1027 | *
|
---|
| 1028 | * @see `setValue` for options
|
---|
| 1029 | */
|
---|
| 1030 | patchValue(value, options = {}) {
|
---|
| 1031 | this.setValue(value, options);
|
---|
| 1032 | }
|
---|
| 1033 | /**
|
---|
| 1034 | * Resets the form control, marking it `pristine` and `untouched`, and setting
|
---|
| 1035 | * the value to null.
|
---|
| 1036 | *
|
---|
| 1037 | * @param formState Resets the control with an initial value,
|
---|
| 1038 | * or an object that defines the initial value and disabled state.
|
---|
| 1039 | *
|
---|
| 1040 | * @param options Configuration options that determine how the control propagates changes
|
---|
| 1041 | * and emits events after the value changes.
|
---|
| 1042 | *
|
---|
| 1043 | * * `onlySelf`: When true, each change only affects this control, and not its parent. Default is
|
---|
| 1044 | * false.
|
---|
| 1045 | * * `emitEvent`: When true or not supplied (the default), both the `statusChanges` and
|
---|
| 1046 | * `valueChanges`
|
---|
| 1047 | * observables emit events with the latest status and value when the control is reset.
|
---|
| 1048 | * When false, no events are emitted.
|
---|
| 1049 | *
|
---|
| 1050 | */
|
---|
| 1051 | reset(formState = null, options = {}) {
|
---|
| 1052 | this._applyFormState(formState);
|
---|
| 1053 | this.markAsPristine(options);
|
---|
| 1054 | this.markAsUntouched(options);
|
---|
| 1055 | this.setValue(this.value, options);
|
---|
| 1056 | this._pendingChange = false;
|
---|
| 1057 | }
|
---|
| 1058 | /**
|
---|
| 1059 | * @internal
|
---|
| 1060 | */
|
---|
| 1061 | _updateValue() { }
|
---|
| 1062 | /**
|
---|
| 1063 | * @internal
|
---|
| 1064 | */
|
---|
| 1065 | _anyControls(condition) {
|
---|
| 1066 | return false;
|
---|
| 1067 | }
|
---|
| 1068 | /**
|
---|
| 1069 | * @internal
|
---|
| 1070 | */
|
---|
| 1071 | _allControlsDisabled() {
|
---|
| 1072 | return this.disabled;
|
---|
| 1073 | }
|
---|
| 1074 | /**
|
---|
| 1075 | * Register a listener for change events.
|
---|
| 1076 | *
|
---|
| 1077 | * @param fn The method that is called when the value changes
|
---|
| 1078 | */
|
---|
| 1079 | registerOnChange(fn) {
|
---|
| 1080 | this._onChange.push(fn);
|
---|
| 1081 | }
|
---|
| 1082 | /**
|
---|
| 1083 | * Internal function to unregister a change events listener.
|
---|
| 1084 | * @internal
|
---|
| 1085 | */
|
---|
| 1086 | _unregisterOnChange(fn) {
|
---|
| 1087 | removeListItem(this._onChange, fn);
|
---|
| 1088 | }
|
---|
| 1089 | /**
|
---|
| 1090 | * Register a listener for disabled events.
|
---|
| 1091 | *
|
---|
| 1092 | * @param fn The method that is called when the disabled status changes.
|
---|
| 1093 | */
|
---|
| 1094 | registerOnDisabledChange(fn) {
|
---|
| 1095 | this._onDisabledChange.push(fn);
|
---|
| 1096 | }
|
---|
| 1097 | /**
|
---|
| 1098 | * Internal function to unregister a disabled event listener.
|
---|
| 1099 | * @internal
|
---|
| 1100 | */
|
---|
| 1101 | _unregisterOnDisabledChange(fn) {
|
---|
| 1102 | removeListItem(this._onDisabledChange, fn);
|
---|
| 1103 | }
|
---|
| 1104 | /**
|
---|
| 1105 | * @internal
|
---|
| 1106 | */
|
---|
| 1107 | _forEachChild(cb) { }
|
---|
| 1108 | /** @internal */
|
---|
| 1109 | _syncPendingControls() {
|
---|
| 1110 | if (this.updateOn === 'submit') {
|
---|
| 1111 | if (this._pendingDirty)
|
---|
| 1112 | this.markAsDirty();
|
---|
| 1113 | if (this._pendingTouched)
|
---|
| 1114 | this.markAsTouched();
|
---|
| 1115 | if (this._pendingChange) {
|
---|
| 1116 | this.setValue(this._pendingValue, { onlySelf: true, emitModelToViewChange: false });
|
---|
| 1117 | return true;
|
---|
| 1118 | }
|
---|
| 1119 | }
|
---|
| 1120 | return false;
|
---|
| 1121 | }
|
---|
| 1122 | _applyFormState(formState) {
|
---|
| 1123 | if (this._isBoxedValue(formState)) {
|
---|
| 1124 | this.value = this._pendingValue = formState.value;
|
---|
| 1125 | formState.disabled ? this.disable({ onlySelf: true, emitEvent: false }) :
|
---|
| 1126 | this.enable({ onlySelf: true, emitEvent: false });
|
---|
| 1127 | }
|
---|
| 1128 | else {
|
---|
| 1129 | this.value = this._pendingValue = formState;
|
---|
| 1130 | }
|
---|
| 1131 | }
|
---|
| 1132 | }
|
---|
| 1133 | /**
|
---|
| 1134 | * Tracks the value and validity state of a group of `FormControl` instances.
|
---|
| 1135 | *
|
---|
| 1136 | * A `FormGroup` aggregates the values of each child `FormControl` into one object,
|
---|
| 1137 | * with each control name as the key. It calculates its status by reducing the status values
|
---|
| 1138 | * of its children. For example, if one of the controls in a group is invalid, the entire
|
---|
| 1139 | * group becomes invalid.
|
---|
| 1140 | *
|
---|
| 1141 | * `FormGroup` is one of the three fundamental building blocks used to define forms in Angular,
|
---|
| 1142 | * along with `FormControl` and `FormArray`.
|
---|
| 1143 | *
|
---|
| 1144 | * When instantiating a `FormGroup`, pass in a collection of child controls as the first
|
---|
| 1145 | * argument. The key for each child registers the name for the control.
|
---|
| 1146 | *
|
---|
| 1147 | * @usageNotes
|
---|
| 1148 | *
|
---|
| 1149 | * ### Create a form group with 2 controls
|
---|
| 1150 | *
|
---|
| 1151 | * ```
|
---|
| 1152 | * const form = new FormGroup({
|
---|
| 1153 | * first: new FormControl('Nancy', Validators.minLength(2)),
|
---|
| 1154 | * last: new FormControl('Drew'),
|
---|
| 1155 | * });
|
---|
| 1156 | *
|
---|
| 1157 | * console.log(form.value); // {first: 'Nancy', last; 'Drew'}
|
---|
| 1158 | * console.log(form.status); // 'VALID'
|
---|
| 1159 | * ```
|
---|
| 1160 | *
|
---|
| 1161 | * ### Create a form group with a group-level validator
|
---|
| 1162 | *
|
---|
| 1163 | * You include group-level validators as the second arg, or group-level async
|
---|
| 1164 | * validators as the third arg. These come in handy when you want to perform validation
|
---|
| 1165 | * that considers the value of more than one child control.
|
---|
| 1166 | *
|
---|
| 1167 | * ```
|
---|
| 1168 | * const form = new FormGroup({
|
---|
| 1169 | * password: new FormControl('', Validators.minLength(2)),
|
---|
| 1170 | * passwordConfirm: new FormControl('', Validators.minLength(2)),
|
---|
| 1171 | * }, passwordMatchValidator);
|
---|
| 1172 | *
|
---|
| 1173 | *
|
---|
| 1174 | * function passwordMatchValidator(g: FormGroup) {
|
---|
| 1175 | * return g.get('password').value === g.get('passwordConfirm').value
|
---|
| 1176 | * ? null : {'mismatch': true};
|
---|
| 1177 | * }
|
---|
| 1178 | * ```
|
---|
| 1179 | *
|
---|
| 1180 | * Like `FormControl` instances, you choose to pass in
|
---|
| 1181 | * validators and async validators as part of an options object.
|
---|
| 1182 | *
|
---|
| 1183 | * ```
|
---|
| 1184 | * const form = new FormGroup({
|
---|
| 1185 | * password: new FormControl('')
|
---|
| 1186 | * passwordConfirm: new FormControl('')
|
---|
| 1187 | * }, { validators: passwordMatchValidator, asyncValidators: otherValidator });
|
---|
| 1188 | * ```
|
---|
| 1189 | *
|
---|
| 1190 | * ### Set the updateOn property for all controls in a form group
|
---|
| 1191 | *
|
---|
| 1192 | * The options object is used to set a default value for each child
|
---|
| 1193 | * control's `updateOn` property. If you set `updateOn` to `'blur'` at the
|
---|
| 1194 | * group level, all child controls default to 'blur', unless the child
|
---|
| 1195 | * has explicitly specified a different `updateOn` value.
|
---|
| 1196 | *
|
---|
| 1197 | * ```ts
|
---|
| 1198 | * const c = new FormGroup({
|
---|
| 1199 | * one: new FormControl()
|
---|
| 1200 | * }, { updateOn: 'blur' });
|
---|
| 1201 | * ```
|
---|
| 1202 | *
|
---|
| 1203 | * @publicApi
|
---|
| 1204 | */
|
---|
| 1205 | export class FormGroup extends AbstractControl {
|
---|
| 1206 | /**
|
---|
| 1207 | * Creates a new `FormGroup` instance.
|
---|
| 1208 | *
|
---|
| 1209 | * @param controls A collection of child controls. The key for each child is the name
|
---|
| 1210 | * under which it is registered.
|
---|
| 1211 | *
|
---|
| 1212 | * @param validatorOrOpts A synchronous validator function, or an array of
|
---|
| 1213 | * such functions, or an `AbstractControlOptions` object that contains validation functions
|
---|
| 1214 | * and a validation trigger.
|
---|
| 1215 | *
|
---|
| 1216 | * @param asyncValidator A single async validator or array of async validator functions
|
---|
| 1217 | *
|
---|
| 1218 | */
|
---|
| 1219 | constructor(controls, validatorOrOpts, asyncValidator) {
|
---|
| 1220 | super(pickValidators(validatorOrOpts), pickAsyncValidators(asyncValidator, validatorOrOpts));
|
---|
| 1221 | this.controls = controls;
|
---|
| 1222 | this._initObservables();
|
---|
| 1223 | this._setUpdateStrategy(validatorOrOpts);
|
---|
| 1224 | this._setUpControls();
|
---|
| 1225 | this.updateValueAndValidity({
|
---|
| 1226 | onlySelf: true,
|
---|
| 1227 | // If `asyncValidator` is present, it will trigger control status change from `PENDING` to
|
---|
| 1228 | // `VALID` or `INVALID`. The status should be broadcasted via the `statusChanges` observable,
|
---|
| 1229 | // so we set `emitEvent` to `true` to allow that during the control creation process.
|
---|
| 1230 | emitEvent: !!this.asyncValidator
|
---|
| 1231 | });
|
---|
| 1232 | }
|
---|
| 1233 | /**
|
---|
| 1234 | * Registers a control with the group's list of controls.
|
---|
| 1235 | *
|
---|
| 1236 | * This method does not update the value or validity of the control.
|
---|
| 1237 | * Use {@link FormGroup#addControl addControl} instead.
|
---|
| 1238 | *
|
---|
| 1239 | * @param name The control name to register in the collection
|
---|
| 1240 | * @param control Provides the control for the given name
|
---|
| 1241 | */
|
---|
| 1242 | registerControl(name, control) {
|
---|
| 1243 | if (this.controls[name])
|
---|
| 1244 | return this.controls[name];
|
---|
| 1245 | this.controls[name] = control;
|
---|
| 1246 | control.setParent(this);
|
---|
| 1247 | control._registerOnCollectionChange(this._onCollectionChange);
|
---|
| 1248 | return control;
|
---|
| 1249 | }
|
---|
| 1250 | /**
|
---|
| 1251 | * Add a control to this group.
|
---|
| 1252 | *
|
---|
| 1253 | * If a control with a given name already exists, it would *not* be replaced with a new one.
|
---|
| 1254 | * If you want to replace an existing control, use the {@link FormGroup#setControl setControl}
|
---|
| 1255 | * method instead. This method also updates the value and validity of the control.
|
---|
| 1256 | *
|
---|
| 1257 | * @param name The control name to add to the collection
|
---|
| 1258 | * @param control Provides the control for the given name
|
---|
| 1259 | * @param options Specifies whether this FormGroup instance should emit events after a new
|
---|
| 1260 | * control is added.
|
---|
| 1261 | * * `emitEvent`: When true or not supplied (the default), both the `statusChanges` and
|
---|
| 1262 | * `valueChanges` observables emit events with the latest status and value when the control is
|
---|
| 1263 | * added. When false, no events are emitted.
|
---|
| 1264 | */
|
---|
| 1265 | addControl(name, control, options = {}) {
|
---|
| 1266 | this.registerControl(name, control);
|
---|
| 1267 | this.updateValueAndValidity({ emitEvent: options.emitEvent });
|
---|
| 1268 | this._onCollectionChange();
|
---|
| 1269 | }
|
---|
| 1270 | /**
|
---|
| 1271 | * Remove a control from this group.
|
---|
| 1272 | *
|
---|
| 1273 | * This method also updates the value and validity of the control.
|
---|
| 1274 | *
|
---|
| 1275 | * @param name The control name to remove from the collection
|
---|
| 1276 | * @param options Specifies whether this FormGroup instance should emit events after a
|
---|
| 1277 | * control is removed.
|
---|
| 1278 | * * `emitEvent`: When true or not supplied (the default), both the `statusChanges` and
|
---|
| 1279 | * `valueChanges` observables emit events with the latest status and value when the control is
|
---|
| 1280 | * removed. When false, no events are emitted.
|
---|
| 1281 | */
|
---|
| 1282 | removeControl(name, options = {}) {
|
---|
| 1283 | if (this.controls[name])
|
---|
| 1284 | this.controls[name]._registerOnCollectionChange(() => { });
|
---|
| 1285 | delete (this.controls[name]);
|
---|
| 1286 | this.updateValueAndValidity({ emitEvent: options.emitEvent });
|
---|
| 1287 | this._onCollectionChange();
|
---|
| 1288 | }
|
---|
| 1289 | /**
|
---|
| 1290 | * Replace an existing control.
|
---|
| 1291 | *
|
---|
| 1292 | * If a control with a given name does not exist in this `FormGroup`, it will be added.
|
---|
| 1293 | *
|
---|
| 1294 | * @param name The control name to replace in the collection
|
---|
| 1295 | * @param control Provides the control for the given name
|
---|
| 1296 | * @param options Specifies whether this FormGroup instance should emit events after an
|
---|
| 1297 | * existing control is replaced.
|
---|
| 1298 | * * `emitEvent`: When true or not supplied (the default), both the `statusChanges` and
|
---|
| 1299 | * `valueChanges` observables emit events with the latest status and value when the control is
|
---|
| 1300 | * replaced with a new one. When false, no events are emitted.
|
---|
| 1301 | */
|
---|
| 1302 | setControl(name, control, options = {}) {
|
---|
| 1303 | if (this.controls[name])
|
---|
| 1304 | this.controls[name]._registerOnCollectionChange(() => { });
|
---|
| 1305 | delete (this.controls[name]);
|
---|
| 1306 | if (control)
|
---|
| 1307 | this.registerControl(name, control);
|
---|
| 1308 | this.updateValueAndValidity({ emitEvent: options.emitEvent });
|
---|
| 1309 | this._onCollectionChange();
|
---|
| 1310 | }
|
---|
| 1311 | /**
|
---|
| 1312 | * Check whether there is an enabled control with the given name in the group.
|
---|
| 1313 | *
|
---|
| 1314 | * Reports false for disabled controls. If you'd like to check for existence in the group
|
---|
| 1315 | * only, use {@link AbstractControl#get get} instead.
|
---|
| 1316 | *
|
---|
| 1317 | * @param controlName The control name to check for existence in the collection
|
---|
| 1318 | *
|
---|
| 1319 | * @returns false for disabled controls, true otherwise.
|
---|
| 1320 | */
|
---|
| 1321 | contains(controlName) {
|
---|
| 1322 | return this.controls.hasOwnProperty(controlName) && this.controls[controlName].enabled;
|
---|
| 1323 | }
|
---|
| 1324 | /**
|
---|
| 1325 | * Sets the value of the `FormGroup`. It accepts an object that matches
|
---|
| 1326 | * the structure of the group, with control names as keys.
|
---|
| 1327 | *
|
---|
| 1328 | * @usageNotes
|
---|
| 1329 | * ### Set the complete value for the form group
|
---|
| 1330 | *
|
---|
| 1331 | * ```
|
---|
| 1332 | * const form = new FormGroup({
|
---|
| 1333 | * first: new FormControl(),
|
---|
| 1334 | * last: new FormControl()
|
---|
| 1335 | * });
|
---|
| 1336 | *
|
---|
| 1337 | * console.log(form.value); // {first: null, last: null}
|
---|
| 1338 | *
|
---|
| 1339 | * form.setValue({first: 'Nancy', last: 'Drew'});
|
---|
| 1340 | * console.log(form.value); // {first: 'Nancy', last: 'Drew'}
|
---|
| 1341 | * ```
|
---|
| 1342 | *
|
---|
| 1343 | * @throws When strict checks fail, such as setting the value of a control
|
---|
| 1344 | * that doesn't exist or if you exclude a value of a control that does exist.
|
---|
| 1345 | *
|
---|
| 1346 | * @param value The new value for the control that matches the structure of the group.
|
---|
| 1347 | * @param options Configuration options that determine how the control propagates changes
|
---|
| 1348 | * and emits events after the value changes.
|
---|
| 1349 | * The configuration options are passed to the {@link AbstractControl#updateValueAndValidity
|
---|
| 1350 | * updateValueAndValidity} method.
|
---|
| 1351 | *
|
---|
| 1352 | * * `onlySelf`: When true, each change only affects this control, and not its parent. Default is
|
---|
| 1353 | * false.
|
---|
| 1354 | * * `emitEvent`: When true or not supplied (the default), both the `statusChanges` and
|
---|
| 1355 | * `valueChanges`
|
---|
| 1356 | * observables emit events with the latest status and value when the control value is updated.
|
---|
| 1357 | * When false, no events are emitted.
|
---|
| 1358 | */
|
---|
| 1359 | setValue(value, options = {}) {
|
---|
| 1360 | this._checkAllValuesPresent(value);
|
---|
| 1361 | Object.keys(value).forEach(name => {
|
---|
| 1362 | this._throwIfControlMissing(name);
|
---|
| 1363 | this.controls[name].setValue(value[name], { onlySelf: true, emitEvent: options.emitEvent });
|
---|
| 1364 | });
|
---|
| 1365 | this.updateValueAndValidity(options);
|
---|
| 1366 | }
|
---|
| 1367 | /**
|
---|
| 1368 | * Patches the value of the `FormGroup`. It accepts an object with control
|
---|
| 1369 | * names as keys, and does its best to match the values to the correct controls
|
---|
| 1370 | * in the group.
|
---|
| 1371 | *
|
---|
| 1372 | * It accepts both super-sets and sub-sets of the group without throwing an error.
|
---|
| 1373 | *
|
---|
| 1374 | * @usageNotes
|
---|
| 1375 | * ### Patch the value for a form group
|
---|
| 1376 | *
|
---|
| 1377 | * ```
|
---|
| 1378 | * const form = new FormGroup({
|
---|
| 1379 | * first: new FormControl(),
|
---|
| 1380 | * last: new FormControl()
|
---|
| 1381 | * });
|
---|
| 1382 | * console.log(form.value); // {first: null, last: null}
|
---|
| 1383 | *
|
---|
| 1384 | * form.patchValue({first: 'Nancy'});
|
---|
| 1385 | * console.log(form.value); // {first: 'Nancy', last: null}
|
---|
| 1386 | * ```
|
---|
| 1387 | *
|
---|
| 1388 | * @param value The object that matches the structure of the group.
|
---|
| 1389 | * @param options Configuration options that determine how the control propagates changes and
|
---|
| 1390 | * emits events after the value is patched.
|
---|
| 1391 | * * `onlySelf`: When true, each change only affects this control and not its parent. Default is
|
---|
| 1392 | * true.
|
---|
| 1393 | * * `emitEvent`: When true or not supplied (the default), both the `statusChanges` and
|
---|
| 1394 | * `valueChanges` observables emit events with the latest status and value when the control value
|
---|
| 1395 | * is updated. When false, no events are emitted. The configuration options are passed to
|
---|
| 1396 | * the {@link AbstractControl#updateValueAndValidity updateValueAndValidity} method.
|
---|
| 1397 | */
|
---|
| 1398 | patchValue(value, options = {}) {
|
---|
| 1399 | // Even though the `value` argument type doesn't allow `null` and `undefined` values, the
|
---|
| 1400 | // `patchValue` can be called recursively and inner data structures might have these values, so
|
---|
| 1401 | // we just ignore such cases when a field containing FormGroup instance receives `null` or
|
---|
| 1402 | // `undefined` as a value.
|
---|
| 1403 | if (value == null /* both `null` and `undefined` */)
|
---|
| 1404 | return;
|
---|
| 1405 | Object.keys(value).forEach(name => {
|
---|
| 1406 | if (this.controls[name]) {
|
---|
| 1407 | this.controls[name].patchValue(value[name], { onlySelf: true, emitEvent: options.emitEvent });
|
---|
| 1408 | }
|
---|
| 1409 | });
|
---|
| 1410 | this.updateValueAndValidity(options);
|
---|
| 1411 | }
|
---|
| 1412 | /**
|
---|
| 1413 | * Resets the `FormGroup`, marks all descendants `pristine` and `untouched` and sets
|
---|
| 1414 | * the value of all descendants to null.
|
---|
| 1415 | *
|
---|
| 1416 | * You reset to a specific form state by passing in a map of states
|
---|
| 1417 | * that matches the structure of your form, with control names as keys. The state
|
---|
| 1418 | * is a standalone value or a form state object with both a value and a disabled
|
---|
| 1419 | * status.
|
---|
| 1420 | *
|
---|
| 1421 | * @param value Resets the control with an initial value,
|
---|
| 1422 | * or an object that defines the initial value and disabled state.
|
---|
| 1423 | *
|
---|
| 1424 | * @param options Configuration options that determine how the control propagates changes
|
---|
| 1425 | * and emits events when the group is reset.
|
---|
| 1426 | * * `onlySelf`: When true, each change only affects this control, and not its parent. Default is
|
---|
| 1427 | * false.
|
---|
| 1428 | * * `emitEvent`: When true or not supplied (the default), both the `statusChanges` and
|
---|
| 1429 | * `valueChanges`
|
---|
| 1430 | * observables emit events with the latest status and value when the control is reset.
|
---|
| 1431 | * When false, no events are emitted.
|
---|
| 1432 | * The configuration options are passed to the {@link AbstractControl#updateValueAndValidity
|
---|
| 1433 | * updateValueAndValidity} method.
|
---|
| 1434 | *
|
---|
| 1435 | * @usageNotes
|
---|
| 1436 | *
|
---|
| 1437 | * ### Reset the form group values
|
---|
| 1438 | *
|
---|
| 1439 | * ```ts
|
---|
| 1440 | * const form = new FormGroup({
|
---|
| 1441 | * first: new FormControl('first name'),
|
---|
| 1442 | * last: new FormControl('last name')
|
---|
| 1443 | * });
|
---|
| 1444 | *
|
---|
| 1445 | * console.log(form.value); // {first: 'first name', last: 'last name'}
|
---|
| 1446 | *
|
---|
| 1447 | * form.reset({ first: 'name', last: 'last name' });
|
---|
| 1448 | *
|
---|
| 1449 | * console.log(form.value); // {first: 'name', last: 'last name'}
|
---|
| 1450 | * ```
|
---|
| 1451 | *
|
---|
| 1452 | * ### Reset the form group values and disabled status
|
---|
| 1453 | *
|
---|
| 1454 | * ```
|
---|
| 1455 | * const form = new FormGroup({
|
---|
| 1456 | * first: new FormControl('first name'),
|
---|
| 1457 | * last: new FormControl('last name')
|
---|
| 1458 | * });
|
---|
| 1459 | *
|
---|
| 1460 | * form.reset({
|
---|
| 1461 | * first: {value: 'name', disabled: true},
|
---|
| 1462 | * last: 'last'
|
---|
| 1463 | * });
|
---|
| 1464 | *
|
---|
| 1465 | * console.log(form.value); // {last: 'last'}
|
---|
| 1466 | * console.log(form.get('first').status); // 'DISABLED'
|
---|
| 1467 | * ```
|
---|
| 1468 | */
|
---|
| 1469 | reset(value = {}, options = {}) {
|
---|
| 1470 | this._forEachChild((control, name) => {
|
---|
| 1471 | control.reset(value[name], { onlySelf: true, emitEvent: options.emitEvent });
|
---|
| 1472 | });
|
---|
| 1473 | this._updatePristine(options);
|
---|
| 1474 | this._updateTouched(options);
|
---|
| 1475 | this.updateValueAndValidity(options);
|
---|
| 1476 | }
|
---|
| 1477 | /**
|
---|
| 1478 | * The aggregate value of the `FormGroup`, including any disabled controls.
|
---|
| 1479 | *
|
---|
| 1480 | * Retrieves all values regardless of disabled status.
|
---|
| 1481 | * The `value` property is the best way to get the value of the group, because
|
---|
| 1482 | * it excludes disabled controls in the `FormGroup`.
|
---|
| 1483 | */
|
---|
| 1484 | getRawValue() {
|
---|
| 1485 | return this._reduceChildren({}, (acc, control, name) => {
|
---|
| 1486 | acc[name] = control instanceof FormControl ? control.value : control.getRawValue();
|
---|
| 1487 | return acc;
|
---|
| 1488 | });
|
---|
| 1489 | }
|
---|
| 1490 | /** @internal */
|
---|
| 1491 | _syncPendingControls() {
|
---|
| 1492 | let subtreeUpdated = this._reduceChildren(false, (updated, child) => {
|
---|
| 1493 | return child._syncPendingControls() ? true : updated;
|
---|
| 1494 | });
|
---|
| 1495 | if (subtreeUpdated)
|
---|
| 1496 | this.updateValueAndValidity({ onlySelf: true });
|
---|
| 1497 | return subtreeUpdated;
|
---|
| 1498 | }
|
---|
| 1499 | /** @internal */
|
---|
| 1500 | _throwIfControlMissing(name) {
|
---|
| 1501 | if (!Object.keys(this.controls).length) {
|
---|
| 1502 | throw new Error(`
|
---|
| 1503 | There are no form controls registered with this group yet. If you're using ngModel,
|
---|
| 1504 | you may want to check next tick (e.g. use setTimeout).
|
---|
| 1505 | `);
|
---|
| 1506 | }
|
---|
| 1507 | if (!this.controls[name]) {
|
---|
| 1508 | throw new Error(`Cannot find form control with name: ${name}.`);
|
---|
| 1509 | }
|
---|
| 1510 | }
|
---|
| 1511 | /** @internal */
|
---|
| 1512 | _forEachChild(cb) {
|
---|
| 1513 | Object.keys(this.controls).forEach(key => {
|
---|
| 1514 | // The list of controls can change (for ex. controls might be removed) while the loop
|
---|
| 1515 | // is running (as a result of invoking Forms API in `valueChanges` subscription), so we
|
---|
| 1516 | // have to null check before invoking the callback.
|
---|
| 1517 | const control = this.controls[key];
|
---|
| 1518 | control && cb(control, key);
|
---|
| 1519 | });
|
---|
| 1520 | }
|
---|
| 1521 | /** @internal */
|
---|
| 1522 | _setUpControls() {
|
---|
| 1523 | this._forEachChild((control) => {
|
---|
| 1524 | control.setParent(this);
|
---|
| 1525 | control._registerOnCollectionChange(this._onCollectionChange);
|
---|
| 1526 | });
|
---|
| 1527 | }
|
---|
| 1528 | /** @internal */
|
---|
| 1529 | _updateValue() {
|
---|
| 1530 | this.value = this._reduceValue();
|
---|
| 1531 | }
|
---|
| 1532 | /** @internal */
|
---|
| 1533 | _anyControls(condition) {
|
---|
| 1534 | for (const controlName of Object.keys(this.controls)) {
|
---|
| 1535 | const control = this.controls[controlName];
|
---|
| 1536 | if (this.contains(controlName) && condition(control)) {
|
---|
| 1537 | return true;
|
---|
| 1538 | }
|
---|
| 1539 | }
|
---|
| 1540 | return false;
|
---|
| 1541 | }
|
---|
| 1542 | /** @internal */
|
---|
| 1543 | _reduceValue() {
|
---|
| 1544 | return this._reduceChildren({}, (acc, control, name) => {
|
---|
| 1545 | if (control.enabled || this.disabled) {
|
---|
| 1546 | acc[name] = control.value;
|
---|
| 1547 | }
|
---|
| 1548 | return acc;
|
---|
| 1549 | });
|
---|
| 1550 | }
|
---|
| 1551 | /** @internal */
|
---|
| 1552 | _reduceChildren(initValue, fn) {
|
---|
| 1553 | let res = initValue;
|
---|
| 1554 | this._forEachChild((control, name) => {
|
---|
| 1555 | res = fn(res, control, name);
|
---|
| 1556 | });
|
---|
| 1557 | return res;
|
---|
| 1558 | }
|
---|
| 1559 | /** @internal */
|
---|
| 1560 | _allControlsDisabled() {
|
---|
| 1561 | for (const controlName of Object.keys(this.controls)) {
|
---|
| 1562 | if (this.controls[controlName].enabled) {
|
---|
| 1563 | return false;
|
---|
| 1564 | }
|
---|
| 1565 | }
|
---|
| 1566 | return Object.keys(this.controls).length > 0 || this.disabled;
|
---|
| 1567 | }
|
---|
| 1568 | /** @internal */
|
---|
| 1569 | _checkAllValuesPresent(value) {
|
---|
| 1570 | this._forEachChild((control, name) => {
|
---|
| 1571 | if (value[name] === undefined) {
|
---|
| 1572 | throw new Error(`Must supply a value for form control with name: '${name}'.`);
|
---|
| 1573 | }
|
---|
| 1574 | });
|
---|
| 1575 | }
|
---|
| 1576 | }
|
---|
| 1577 | /**
|
---|
| 1578 | * Tracks the value and validity state of an array of `FormControl`,
|
---|
| 1579 | * `FormGroup` or `FormArray` instances.
|
---|
| 1580 | *
|
---|
| 1581 | * A `FormArray` aggregates the values of each child `FormControl` into an array.
|
---|
| 1582 | * It calculates its status by reducing the status values of its children. For example, if one of
|
---|
| 1583 | * the controls in a `FormArray` is invalid, the entire array becomes invalid.
|
---|
| 1584 | *
|
---|
| 1585 | * `FormArray` is one of the three fundamental building blocks used to define forms in Angular,
|
---|
| 1586 | * along with `FormControl` and `FormGroup`.
|
---|
| 1587 | *
|
---|
| 1588 | * @usageNotes
|
---|
| 1589 | *
|
---|
| 1590 | * ### Create an array of form controls
|
---|
| 1591 | *
|
---|
| 1592 | * ```
|
---|
| 1593 | * const arr = new FormArray([
|
---|
| 1594 | * new FormControl('Nancy', Validators.minLength(2)),
|
---|
| 1595 | * new FormControl('Drew'),
|
---|
| 1596 | * ]);
|
---|
| 1597 | *
|
---|
| 1598 | * console.log(arr.value); // ['Nancy', 'Drew']
|
---|
| 1599 | * console.log(arr.status); // 'VALID'
|
---|
| 1600 | * ```
|
---|
| 1601 | *
|
---|
| 1602 | * ### Create a form array with array-level validators
|
---|
| 1603 | *
|
---|
| 1604 | * You include array-level validators and async validators. These come in handy
|
---|
| 1605 | * when you want to perform validation that considers the value of more than one child
|
---|
| 1606 | * control.
|
---|
| 1607 | *
|
---|
| 1608 | * The two types of validators are passed in separately as the second and third arg
|
---|
| 1609 | * respectively, or together as part of an options object.
|
---|
| 1610 | *
|
---|
| 1611 | * ```
|
---|
| 1612 | * const arr = new FormArray([
|
---|
| 1613 | * new FormControl('Nancy'),
|
---|
| 1614 | * new FormControl('Drew')
|
---|
| 1615 | * ], {validators: myValidator, asyncValidators: myAsyncValidator});
|
---|
| 1616 | * ```
|
---|
| 1617 | *
|
---|
| 1618 | * ### Set the updateOn property for all controls in a form array
|
---|
| 1619 | *
|
---|
| 1620 | * The options object is used to set a default value for each child
|
---|
| 1621 | * control's `updateOn` property. If you set `updateOn` to `'blur'` at the
|
---|
| 1622 | * array level, all child controls default to 'blur', unless the child
|
---|
| 1623 | * has explicitly specified a different `updateOn` value.
|
---|
| 1624 | *
|
---|
| 1625 | * ```ts
|
---|
| 1626 | * const arr = new FormArray([
|
---|
| 1627 | * new FormControl()
|
---|
| 1628 | * ], {updateOn: 'blur'});
|
---|
| 1629 | * ```
|
---|
| 1630 | *
|
---|
| 1631 | * ### Adding or removing controls from a form array
|
---|
| 1632 | *
|
---|
| 1633 | * To change the controls in the array, use the `push`, `insert`, `removeAt` or `clear` methods
|
---|
| 1634 | * in `FormArray` itself. These methods ensure the controls are properly tracked in the
|
---|
| 1635 | * form's hierarchy. Do not modify the array of `AbstractControl`s used to instantiate
|
---|
| 1636 | * the `FormArray` directly, as that result in strange and unexpected behavior such
|
---|
| 1637 | * as broken change detection.
|
---|
| 1638 | *
|
---|
| 1639 | * @publicApi
|
---|
| 1640 | */
|
---|
| 1641 | export class FormArray extends AbstractControl {
|
---|
| 1642 | /**
|
---|
| 1643 | * Creates a new `FormArray` instance.
|
---|
| 1644 | *
|
---|
| 1645 | * @param controls An array of child controls. Each child control is given an index
|
---|
| 1646 | * where it is registered.
|
---|
| 1647 | *
|
---|
| 1648 | * @param validatorOrOpts A synchronous validator function, or an array of
|
---|
| 1649 | * such functions, or an `AbstractControlOptions` object that contains validation functions
|
---|
| 1650 | * and a validation trigger.
|
---|
| 1651 | *
|
---|
| 1652 | * @param asyncValidator A single async validator or array of async validator functions
|
---|
| 1653 | *
|
---|
| 1654 | */
|
---|
| 1655 | constructor(controls, validatorOrOpts, asyncValidator) {
|
---|
| 1656 | super(pickValidators(validatorOrOpts), pickAsyncValidators(asyncValidator, validatorOrOpts));
|
---|
| 1657 | this.controls = controls;
|
---|
| 1658 | this._initObservables();
|
---|
| 1659 | this._setUpdateStrategy(validatorOrOpts);
|
---|
| 1660 | this._setUpControls();
|
---|
| 1661 | this.updateValueAndValidity({
|
---|
| 1662 | onlySelf: true,
|
---|
| 1663 | // If `asyncValidator` is present, it will trigger control status change from `PENDING` to
|
---|
| 1664 | // `VALID` or `INVALID`.
|
---|
| 1665 | // The status should be broadcasted via the `statusChanges` observable, so we set `emitEvent`
|
---|
| 1666 | // to `true` to allow that during the control creation process.
|
---|
| 1667 | emitEvent: !!this.asyncValidator
|
---|
| 1668 | });
|
---|
| 1669 | }
|
---|
| 1670 | /**
|
---|
| 1671 | * Get the `AbstractControl` at the given `index` in the array.
|
---|
| 1672 | *
|
---|
| 1673 | * @param index Index in the array to retrieve the control
|
---|
| 1674 | */
|
---|
| 1675 | at(index) {
|
---|
| 1676 | return this.controls[index];
|
---|
| 1677 | }
|
---|
| 1678 | /**
|
---|
| 1679 | * Insert a new `AbstractControl` at the end of the array.
|
---|
| 1680 | *
|
---|
| 1681 | * @param control Form control to be inserted
|
---|
| 1682 | * @param options Specifies whether this FormArray instance should emit events after a new
|
---|
| 1683 | * control is added.
|
---|
| 1684 | * * `emitEvent`: When true or not supplied (the default), both the `statusChanges` and
|
---|
| 1685 | * `valueChanges` observables emit events with the latest status and value when the control is
|
---|
| 1686 | * inserted. When false, no events are emitted.
|
---|
| 1687 | */
|
---|
| 1688 | push(control, options = {}) {
|
---|
| 1689 | this.controls.push(control);
|
---|
| 1690 | this._registerControl(control);
|
---|
| 1691 | this.updateValueAndValidity({ emitEvent: options.emitEvent });
|
---|
| 1692 | this._onCollectionChange();
|
---|
| 1693 | }
|
---|
| 1694 | /**
|
---|
| 1695 | * Insert a new `AbstractControl` at the given `index` in the array.
|
---|
| 1696 | *
|
---|
| 1697 | * @param index Index in the array to insert the control
|
---|
| 1698 | * @param control Form control to be inserted
|
---|
| 1699 | * @param options Specifies whether this FormArray instance should emit events after a new
|
---|
| 1700 | * control is inserted.
|
---|
| 1701 | * * `emitEvent`: When true or not supplied (the default), both the `statusChanges` and
|
---|
| 1702 | * `valueChanges` observables emit events with the latest status and value when the control is
|
---|
| 1703 | * inserted. When false, no events are emitted.
|
---|
| 1704 | */
|
---|
| 1705 | insert(index, control, options = {}) {
|
---|
| 1706 | this.controls.splice(index, 0, control);
|
---|
| 1707 | this._registerControl(control);
|
---|
| 1708 | this.updateValueAndValidity({ emitEvent: options.emitEvent });
|
---|
| 1709 | }
|
---|
| 1710 | /**
|
---|
| 1711 | * Remove the control at the given `index` in the array.
|
---|
| 1712 | *
|
---|
| 1713 | * @param index Index in the array to remove the control
|
---|
| 1714 | * @param options Specifies whether this FormArray instance should emit events after a
|
---|
| 1715 | * control is removed.
|
---|
| 1716 | * * `emitEvent`: When true or not supplied (the default), both the `statusChanges` and
|
---|
| 1717 | * `valueChanges` observables emit events with the latest status and value when the control is
|
---|
| 1718 | * removed. When false, no events are emitted.
|
---|
| 1719 | */
|
---|
| 1720 | removeAt(index, options = {}) {
|
---|
| 1721 | if (this.controls[index])
|
---|
| 1722 | this.controls[index]._registerOnCollectionChange(() => { });
|
---|
| 1723 | this.controls.splice(index, 1);
|
---|
| 1724 | this.updateValueAndValidity({ emitEvent: options.emitEvent });
|
---|
| 1725 | }
|
---|
| 1726 | /**
|
---|
| 1727 | * Replace an existing control.
|
---|
| 1728 | *
|
---|
| 1729 | * @param index Index in the array to replace the control
|
---|
| 1730 | * @param control The `AbstractControl` control to replace the existing control
|
---|
| 1731 | * @param options Specifies whether this FormArray instance should emit events after an
|
---|
| 1732 | * existing control is replaced with a new one.
|
---|
| 1733 | * * `emitEvent`: When true or not supplied (the default), both the `statusChanges` and
|
---|
| 1734 | * `valueChanges` observables emit events with the latest status and value when the control is
|
---|
| 1735 | * replaced with a new one. When false, no events are emitted.
|
---|
| 1736 | */
|
---|
| 1737 | setControl(index, control, options = {}) {
|
---|
| 1738 | if (this.controls[index])
|
---|
| 1739 | this.controls[index]._registerOnCollectionChange(() => { });
|
---|
| 1740 | this.controls.splice(index, 1);
|
---|
| 1741 | if (control) {
|
---|
| 1742 | this.controls.splice(index, 0, control);
|
---|
| 1743 | this._registerControl(control);
|
---|
| 1744 | }
|
---|
| 1745 | this.updateValueAndValidity({ emitEvent: options.emitEvent });
|
---|
| 1746 | this._onCollectionChange();
|
---|
| 1747 | }
|
---|
| 1748 | /**
|
---|
| 1749 | * Length of the control array.
|
---|
| 1750 | */
|
---|
| 1751 | get length() {
|
---|
| 1752 | return this.controls.length;
|
---|
| 1753 | }
|
---|
| 1754 | /**
|
---|
| 1755 | * Sets the value of the `FormArray`. It accepts an array that matches
|
---|
| 1756 | * the structure of the control.
|
---|
| 1757 | *
|
---|
| 1758 | * This method performs strict checks, and throws an error if you try
|
---|
| 1759 | * to set the value of a control that doesn't exist or if you exclude the
|
---|
| 1760 | * value of a control.
|
---|
| 1761 | *
|
---|
| 1762 | * @usageNotes
|
---|
| 1763 | * ### Set the values for the controls in the form array
|
---|
| 1764 | *
|
---|
| 1765 | * ```
|
---|
| 1766 | * const arr = new FormArray([
|
---|
| 1767 | * new FormControl(),
|
---|
| 1768 | * new FormControl()
|
---|
| 1769 | * ]);
|
---|
| 1770 | * console.log(arr.value); // [null, null]
|
---|
| 1771 | *
|
---|
| 1772 | * arr.setValue(['Nancy', 'Drew']);
|
---|
| 1773 | * console.log(arr.value); // ['Nancy', 'Drew']
|
---|
| 1774 | * ```
|
---|
| 1775 | *
|
---|
| 1776 | * @param value Array of values for the controls
|
---|
| 1777 | * @param options Configure options that determine how the control propagates changes and
|
---|
| 1778 | * emits events after the value changes
|
---|
| 1779 | *
|
---|
| 1780 | * * `onlySelf`: When true, each change only affects this control, and not its parent. Default
|
---|
| 1781 | * is false.
|
---|
| 1782 | * * `emitEvent`: When true or not supplied (the default), both the `statusChanges` and
|
---|
| 1783 | * `valueChanges`
|
---|
| 1784 | * observables emit events with the latest status and value when the control value is updated.
|
---|
| 1785 | * When false, no events are emitted.
|
---|
| 1786 | * The configuration options are passed to the {@link AbstractControl#updateValueAndValidity
|
---|
| 1787 | * updateValueAndValidity} method.
|
---|
| 1788 | */
|
---|
| 1789 | setValue(value, options = {}) {
|
---|
| 1790 | this._checkAllValuesPresent(value);
|
---|
| 1791 | value.forEach((newValue, index) => {
|
---|
| 1792 | this._throwIfControlMissing(index);
|
---|
| 1793 | this.at(index).setValue(newValue, { onlySelf: true, emitEvent: options.emitEvent });
|
---|
| 1794 | });
|
---|
| 1795 | this.updateValueAndValidity(options);
|
---|
| 1796 | }
|
---|
| 1797 | /**
|
---|
| 1798 | * Patches the value of the `FormArray`. It accepts an array that matches the
|
---|
| 1799 | * structure of the control, and does its best to match the values to the correct
|
---|
| 1800 | * controls in the group.
|
---|
| 1801 | *
|
---|
| 1802 | * It accepts both super-sets and sub-sets of the array without throwing an error.
|
---|
| 1803 | *
|
---|
| 1804 | * @usageNotes
|
---|
| 1805 | * ### Patch the values for controls in a form array
|
---|
| 1806 | *
|
---|
| 1807 | * ```
|
---|
| 1808 | * const arr = new FormArray([
|
---|
| 1809 | * new FormControl(),
|
---|
| 1810 | * new FormControl()
|
---|
| 1811 | * ]);
|
---|
| 1812 | * console.log(arr.value); // [null, null]
|
---|
| 1813 | *
|
---|
| 1814 | * arr.patchValue(['Nancy']);
|
---|
| 1815 | * console.log(arr.value); // ['Nancy', null]
|
---|
| 1816 | * ```
|
---|
| 1817 | *
|
---|
| 1818 | * @param value Array of latest values for the controls
|
---|
| 1819 | * @param options Configure options that determine how the control propagates changes and
|
---|
| 1820 | * emits events after the value changes
|
---|
| 1821 | *
|
---|
| 1822 | * * `onlySelf`: When true, each change only affects this control, and not its parent. Default
|
---|
| 1823 | * is false.
|
---|
| 1824 | * * `emitEvent`: When true or not supplied (the default), both the `statusChanges` and
|
---|
| 1825 | * `valueChanges` observables emit events with the latest status and value when the control value
|
---|
| 1826 | * is updated. When false, no events are emitted. The configuration options are passed to
|
---|
| 1827 | * the {@link AbstractControl#updateValueAndValidity updateValueAndValidity} method.
|
---|
| 1828 | */
|
---|
| 1829 | patchValue(value, options = {}) {
|
---|
| 1830 | // Even though the `value` argument type doesn't allow `null` and `undefined` values, the
|
---|
| 1831 | // `patchValue` can be called recursively and inner data structures might have these values, so
|
---|
| 1832 | // we just ignore such cases when a field containing FormArray instance receives `null` or
|
---|
| 1833 | // `undefined` as a value.
|
---|
| 1834 | if (value == null /* both `null` and `undefined` */)
|
---|
| 1835 | return;
|
---|
| 1836 | value.forEach((newValue, index) => {
|
---|
| 1837 | if (this.at(index)) {
|
---|
| 1838 | this.at(index).patchValue(newValue, { onlySelf: true, emitEvent: options.emitEvent });
|
---|
| 1839 | }
|
---|
| 1840 | });
|
---|
| 1841 | this.updateValueAndValidity(options);
|
---|
| 1842 | }
|
---|
| 1843 | /**
|
---|
| 1844 | * Resets the `FormArray` and all descendants are marked `pristine` and `untouched`, and the
|
---|
| 1845 | * value of all descendants to null or null maps.
|
---|
| 1846 | *
|
---|
| 1847 | * You reset to a specific form state by passing in an array of states
|
---|
| 1848 | * that matches the structure of the control. The state is a standalone value
|
---|
| 1849 | * or a form state object with both a value and a disabled status.
|
---|
| 1850 | *
|
---|
| 1851 | * @usageNotes
|
---|
| 1852 | * ### Reset the values in a form array
|
---|
| 1853 | *
|
---|
| 1854 | * ```ts
|
---|
| 1855 | * const arr = new FormArray([
|
---|
| 1856 | * new FormControl(),
|
---|
| 1857 | * new FormControl()
|
---|
| 1858 | * ]);
|
---|
| 1859 | * arr.reset(['name', 'last name']);
|
---|
| 1860 | *
|
---|
| 1861 | * console.log(arr.value); // ['name', 'last name']
|
---|
| 1862 | * ```
|
---|
| 1863 | *
|
---|
| 1864 | * ### Reset the values in a form array and the disabled status for the first control
|
---|
| 1865 | *
|
---|
| 1866 | * ```
|
---|
| 1867 | * arr.reset([
|
---|
| 1868 | * {value: 'name', disabled: true},
|
---|
| 1869 | * 'last'
|
---|
| 1870 | * ]);
|
---|
| 1871 | *
|
---|
| 1872 | * console.log(arr.value); // ['last']
|
---|
| 1873 | * console.log(arr.at(0).status); // 'DISABLED'
|
---|
| 1874 | * ```
|
---|
| 1875 | *
|
---|
| 1876 | * @param value Array of values for the controls
|
---|
| 1877 | * @param options Configure options that determine how the control propagates changes and
|
---|
| 1878 | * emits events after the value changes
|
---|
| 1879 | *
|
---|
| 1880 | * * `onlySelf`: When true, each change only affects this control, and not its parent. Default
|
---|
| 1881 | * is false.
|
---|
| 1882 | * * `emitEvent`: When true or not supplied (the default), both the `statusChanges` and
|
---|
| 1883 | * `valueChanges`
|
---|
| 1884 | * observables emit events with the latest status and value when the control is reset.
|
---|
| 1885 | * When false, no events are emitted.
|
---|
| 1886 | * The configuration options are passed to the {@link AbstractControl#updateValueAndValidity
|
---|
| 1887 | * updateValueAndValidity} method.
|
---|
| 1888 | */
|
---|
| 1889 | reset(value = [], options = {}) {
|
---|
| 1890 | this._forEachChild((control, index) => {
|
---|
| 1891 | control.reset(value[index], { onlySelf: true, emitEvent: options.emitEvent });
|
---|
| 1892 | });
|
---|
| 1893 | this._updatePristine(options);
|
---|
| 1894 | this._updateTouched(options);
|
---|
| 1895 | this.updateValueAndValidity(options);
|
---|
| 1896 | }
|
---|
| 1897 | /**
|
---|
| 1898 | * The aggregate value of the array, including any disabled controls.
|
---|
| 1899 | *
|
---|
| 1900 | * Reports all values regardless of disabled status.
|
---|
| 1901 | * For enabled controls only, the `value` property is the best way to get the value of the array.
|
---|
| 1902 | */
|
---|
| 1903 | getRawValue() {
|
---|
| 1904 | return this.controls.map((control) => {
|
---|
| 1905 | return control instanceof FormControl ? control.value : control.getRawValue();
|
---|
| 1906 | });
|
---|
| 1907 | }
|
---|
| 1908 | /**
|
---|
| 1909 | * Remove all controls in the `FormArray`.
|
---|
| 1910 | *
|
---|
| 1911 | * @param options Specifies whether this FormArray instance should emit events after all
|
---|
| 1912 | * controls are removed.
|
---|
| 1913 | * * `emitEvent`: When true or not supplied (the default), both the `statusChanges` and
|
---|
| 1914 | * `valueChanges` observables emit events with the latest status and value when all controls
|
---|
| 1915 | * in this FormArray instance are removed. When false, no events are emitted.
|
---|
| 1916 | *
|
---|
| 1917 | * @usageNotes
|
---|
| 1918 | * ### Remove all elements from a FormArray
|
---|
| 1919 | *
|
---|
| 1920 | * ```ts
|
---|
| 1921 | * const arr = new FormArray([
|
---|
| 1922 | * new FormControl(),
|
---|
| 1923 | * new FormControl()
|
---|
| 1924 | * ]);
|
---|
| 1925 | * console.log(arr.length); // 2
|
---|
| 1926 | *
|
---|
| 1927 | * arr.clear();
|
---|
| 1928 | * console.log(arr.length); // 0
|
---|
| 1929 | * ```
|
---|
| 1930 | *
|
---|
| 1931 | * It's a simpler and more efficient alternative to removing all elements one by one:
|
---|
| 1932 | *
|
---|
| 1933 | * ```ts
|
---|
| 1934 | * const arr = new FormArray([
|
---|
| 1935 | * new FormControl(),
|
---|
| 1936 | * new FormControl()
|
---|
| 1937 | * ]);
|
---|
| 1938 | *
|
---|
| 1939 | * while (arr.length) {
|
---|
| 1940 | * arr.removeAt(0);
|
---|
| 1941 | * }
|
---|
| 1942 | * ```
|
---|
| 1943 | */
|
---|
| 1944 | clear(options = {}) {
|
---|
| 1945 | if (this.controls.length < 1)
|
---|
| 1946 | return;
|
---|
| 1947 | this._forEachChild((control) => control._registerOnCollectionChange(() => { }));
|
---|
| 1948 | this.controls.splice(0);
|
---|
| 1949 | this.updateValueAndValidity({ emitEvent: options.emitEvent });
|
---|
| 1950 | }
|
---|
| 1951 | /** @internal */
|
---|
| 1952 | _syncPendingControls() {
|
---|
| 1953 | let subtreeUpdated = this.controls.reduce((updated, child) => {
|
---|
| 1954 | return child._syncPendingControls() ? true : updated;
|
---|
| 1955 | }, false);
|
---|
| 1956 | if (subtreeUpdated)
|
---|
| 1957 | this.updateValueAndValidity({ onlySelf: true });
|
---|
| 1958 | return subtreeUpdated;
|
---|
| 1959 | }
|
---|
| 1960 | /** @internal */
|
---|
| 1961 | _throwIfControlMissing(index) {
|
---|
| 1962 | if (!this.controls.length) {
|
---|
| 1963 | throw new Error(`
|
---|
| 1964 | There are no form controls registered with this array yet. If you're using ngModel,
|
---|
| 1965 | you may want to check next tick (e.g. use setTimeout).
|
---|
| 1966 | `);
|
---|
| 1967 | }
|
---|
| 1968 | if (!this.at(index)) {
|
---|
| 1969 | throw new Error(`Cannot find form control at index ${index}`);
|
---|
| 1970 | }
|
---|
| 1971 | }
|
---|
| 1972 | /** @internal */
|
---|
| 1973 | _forEachChild(cb) {
|
---|
| 1974 | this.controls.forEach((control, index) => {
|
---|
| 1975 | cb(control, index);
|
---|
| 1976 | });
|
---|
| 1977 | }
|
---|
| 1978 | /** @internal */
|
---|
| 1979 | _updateValue() {
|
---|
| 1980 | this.value =
|
---|
| 1981 | this.controls.filter((control) => control.enabled || this.disabled)
|
---|
| 1982 | .map((control) => control.value);
|
---|
| 1983 | }
|
---|
| 1984 | /** @internal */
|
---|
| 1985 | _anyControls(condition) {
|
---|
| 1986 | return this.controls.some((control) => control.enabled && condition(control));
|
---|
| 1987 | }
|
---|
| 1988 | /** @internal */
|
---|
| 1989 | _setUpControls() {
|
---|
| 1990 | this._forEachChild((control) => this._registerControl(control));
|
---|
| 1991 | }
|
---|
| 1992 | /** @internal */
|
---|
| 1993 | _checkAllValuesPresent(value) {
|
---|
| 1994 | this._forEachChild((control, i) => {
|
---|
| 1995 | if (value[i] === undefined) {
|
---|
| 1996 | throw new Error(`Must supply a value for form control at index: ${i}.`);
|
---|
| 1997 | }
|
---|
| 1998 | });
|
---|
| 1999 | }
|
---|
| 2000 | /** @internal */
|
---|
| 2001 | _allControlsDisabled() {
|
---|
| 2002 | for (const control of this.controls) {
|
---|
| 2003 | if (control.enabled)
|
---|
| 2004 | return false;
|
---|
| 2005 | }
|
---|
| 2006 | return this.controls.length > 0 || this.disabled;
|
---|
| 2007 | }
|
---|
| 2008 | _registerControl(control) {
|
---|
| 2009 | control.setParent(this);
|
---|
| 2010 | control._registerOnCollectionChange(this._onCollectionChange);
|
---|
| 2011 | }
|
---|
| 2012 | }
|
---|
| 2013 | //# 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* @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {EventEmitter} from '@angular/core';\nimport {Observable} from 'rxjs';\n\nimport {removeListItem} from './directives/shared';\nimport {AsyncValidatorFn, ValidationErrors, ValidatorFn} from './directives/validators';\nimport {addValidators, composeAsyncValidators, composeValidators, hasValidator, makeValidatorsArray, removeValidators, toObservable} from './validators';\n\n/**\n * Reports that a FormControl is valid, meaning that no errors exist in the input value.\n *\n * @see `status`\n */\nexport const VALID = 'VALID';\n\n/**\n * Reports that a FormControl is invalid, meaning that an error exists in the input value.\n *\n * @see `status`\n */\nexport const INVALID = 'INVALID';\n\n/**\n * Reports that a FormControl is pending, meaning that that async validation is occurring and\n * errors are not yet available for the input value.\n *\n * @see `markAsPending`\n * @see `status`\n */\nexport const PENDING = 'PENDING';\n\n/**\n * Reports that a FormControl is disabled, meaning that the control is exempt from ancestor\n * calculations of validity or value.\n *\n * @see `markAsDisabled`\n * @see `status`\n */\nexport const DISABLED = 'DISABLED';\n\nfunction _find(control: AbstractControl, path: Array<string|number>|string, delimiter: string) {\n  if (path == null) return null;\n\n  if (!Array.isArray(path)) {\n    path = path.split(delimiter);\n  }\n  if (Array.isArray(path) && path.length === 0) return null;\n\n  // Not using Array.reduce here due to a Chrome 80 bug\n  // https://bugs.chromium.org/p/chromium/issues/detail?id=1049982\n  let controlToFind: AbstractControl|null = control;\n  path.forEach((name: string|number) => {\n    if (controlToFind instanceof FormGroup) {\n      controlToFind = controlToFind.controls.hasOwnProperty(name as string) ?\n          controlToFind.controls[name] :\n          null;\n    } else if (controlToFind instanceof FormArray) {\n      controlToFind = controlToFind.at(<number>name) || null;\n    } else {\n      controlToFind = null;\n    }\n  });\n  return controlToFind;\n}\n\n/**\n * Gets validators from either an options object or given validators.\n */\nfunction pickValidators(validatorOrOpts?: ValidatorFn|ValidatorFn[]|AbstractControlOptions|\n                        null): ValidatorFn|ValidatorFn[]|null {\n  return (isOptionsObj(validatorOrOpts) ? validatorOrOpts.validators : validatorOrOpts) || null;\n}\n\n/**\n * Creates validator function by combining provided validators.\n */\nfunction coerceToValidator(validator: ValidatorFn|ValidatorFn[]|null): ValidatorFn|null {\n  return Array.isArray(validator) ? composeValidators(validator) : validator || null;\n}\n\n/**\n * Gets async validators from either an options object or given validators.\n */\nfunction pickAsyncValidators(\n    asyncValidator?: AsyncValidatorFn|AsyncValidatorFn[]|null,\n    validatorOrOpts?: ValidatorFn|ValidatorFn[]|AbstractControlOptions|null): AsyncValidatorFn|\n    AsyncValidatorFn[]|null {\n  return (isOptionsObj(validatorOrOpts) ? validatorOrOpts.asyncValidators : asyncValidator) || null;\n}\n\n/**\n * Creates async validator function by combining provided async validators.\n */\nfunction coerceToAsyncValidator(asyncValidator?: AsyncValidatorFn|AsyncValidatorFn[]|\n                                null): AsyncValidatorFn|null {\n  return Array.isArray(asyncValidator) ? composeAsyncValidators(asyncValidator) :\n                                         asyncValidator || null;\n}\n\nexport type FormHooks = 'change'|'blur'|'submit';\n\n/**\n * Interface for options provided to an `AbstractControl`.\n *\n * @publicApi\n */\nexport interface AbstractControlOptions {\n  /**\n   * @description\n   * The list of validators applied to a control.\n   */\n  validators?: ValidatorFn|ValidatorFn[]|null;\n  /**\n   * @description\n   * The list of async validators applied to control.\n   */\n  asyncValidators?: AsyncValidatorFn|AsyncValidatorFn[]|null;\n  /**\n   * @description\n   * The event name for control to update upon.\n   */\n  updateOn?: 'change'|'blur'|'submit';\n}\n\nfunction isOptionsObj(validatorOrOpts?: ValidatorFn|ValidatorFn[]|AbstractControlOptions|\n                      null): validatorOrOpts is AbstractControlOptions {\n  return validatorOrOpts != null && !Array.isArray(validatorOrOpts) &&\n      typeof validatorOrOpts === 'object';\n}\n\n/**\n * This is the base class for `FormControl`, `FormGroup`, and `FormArray`.\n *\n * It provides some of the shared behavior that all controls and groups of controls have, like\n * running validators, calculating status, and resetting state. It also defines the properties\n * that are shared between all sub-classes, like `value`, `valid`, and `dirty`. It shouldn't be\n * instantiated directly.\n *\n * @see [Forms Guide](/guide/forms)\n * @see [Reactive Forms Guide](/guide/reactive-forms)\n * @see [Dynamic Forms Guide](/guide/dynamic-form)\n *\n * @publicApi\n */\nexport abstract class AbstractControl {\n  /** @internal */\n  // TODO(issue/24571): remove '!'.\n  _pendingDirty!: boolean;\n\n  /**\n   * Indicates that a control has its own pending asynchronous validation in progress.\n   *\n   * @internal\n   */\n  _hasOwnPendingAsyncValidator = false;\n\n  /** @internal */\n  // TODO(issue/24571): remove '!'.\n  _pendingTouched!: boolean;\n\n  /** @internal */\n  _onCollectionChange = () => {};\n\n  /** @internal */\n  // TODO(issue/24571): remove '!'.\n  _updateOn!: FormHooks;\n\n  private _parent: FormGroup|FormArray|null = null;\n  private _asyncValidationSubscription: any;\n\n  /**\n   * Contains the result of merging synchronous validators into a single validator function\n   * (combined using `Validators.compose`).\n   *\n   * @internal\n   */\n  private _composedValidatorFn: ValidatorFn|null;\n\n  /**\n   * Contains the result of merging asynchronous validators into a single validator function\n   * (combined using `Validators.composeAsync`).\n   *\n   * @internal\n   */\n  private _composedAsyncValidatorFn: AsyncValidatorFn|null;\n\n  /**\n   * Synchronous validators as they were provided:\n   *  - in `AbstractControl` constructor\n   *  - as an argument while calling `setValidators` function\n   *  - while calling the setter on the `validator` field (e.g. `control.validator = validatorFn`)\n   *\n   * @internal\n   */\n  private _rawValidators: ValidatorFn|ValidatorFn[]|null;\n\n  /**\n   * Asynchronous validators as they were provided:\n   *  - in `AbstractControl` constructor\n   *  - as an argument while calling `setAsyncValidators` function\n   *  - while calling the setter on the `asyncValidator` field (e.g. `control.asyncValidator =\n   * asyncValidatorFn`)\n   *\n   * @internal\n   */\n  private _rawAsyncValidators: AsyncValidatorFn|AsyncValidatorFn[]|null;\n\n  /**\n   * The current value of the control.\n   *\n   * * For a `FormControl`, the current value.\n   * * For an enabled `FormGroup`, the values of enabled controls as an object\n   * with a key-value pair for each member of the group.\n   * * For a disabled `FormGroup`, the values of all controls as an object\n   * with a key-value pair for each member of the group.\n   * * For a `FormArray`, the values of enabled controls as an array.\n   *\n   */\n  public readonly value: any;\n\n  /**\n   * Initialize the AbstractControl instance.\n   *\n   * @param validators The function or array of functions that is used to determine the validity of\n   *     this control synchronously.\n   * @param asyncValidators The function or array of functions that is used to determine validity of\n   *     this control asynchronously.\n   */\n  constructor(\n      validators: ValidatorFn|ValidatorFn[]|null,\n      asyncValidators: AsyncValidatorFn|AsyncValidatorFn[]|null) {\n    this._rawValidators = validators;\n    this._rawAsyncValidators = asyncValidators;\n    this._composedValidatorFn = coerceToValidator(this._rawValidators);\n    this._composedAsyncValidatorFn = coerceToAsyncValidator(this._rawAsyncValidators);\n  }\n\n  /**\n   * Returns the function that is used to determine the validity of this control synchronously.\n   * If multiple validators have been added, this will be a single composed function.\n   * See `Validators.compose()` for additional information.\n   */\n  get validator(): ValidatorFn|null {\n    return this._composedValidatorFn;\n  }\n  set validator(validatorFn: ValidatorFn|null) {\n    this._rawValidators = this._composedValidatorFn = validatorFn;\n  }\n\n  /**\n   * Returns the function that is used to determine the validity of this control asynchronously.\n   * If multiple validators have been added, this will be a single composed function.\n   * See `Validators.compose()` for additional information.\n   */\n  get asyncValidator(): AsyncValidatorFn|null {\n    return this._composedAsyncValidatorFn;\n  }\n  set asyncValidator(asyncValidatorFn: AsyncValidatorFn|null) {\n    this._rawAsyncValidators = this._composedAsyncValidatorFn = asyncValidatorFn;\n  }\n\n  /**\n   * The parent control.\n   */\n  get parent(): FormGroup|FormArray|null {\n    return this._parent;\n  }\n\n  /**\n   * The validation status of the control. There are four possible\n   * validation status values:\n   *\n   * * **VALID**: This control has passed all validation checks.\n   * * **INVALID**: This control has failed at least one validation check.\n   * * **PENDING**: This control is in the midst of conducting a validation check.\n   * * **DISABLED**: This control is exempt from validation checks.\n   *\n   * These status values are mutually exclusive, so a control cannot be\n   * both valid AND invalid or invalid AND disabled.\n   */\n  // TODO(issue/24571): remove '!'.\n  public readonly status!: string;\n\n  /**\n   * A control is `valid` when its `status` is `VALID`.\n   *\n   * @see {@link AbstractControl.status}\n   *\n   * @returns True if the control has passed all of its validation tests,\n   * false otherwise.\n   */\n  get valid(): boolean {\n    return this.status === VALID;\n  }\n\n  /**\n   * A control is `invalid` when its `status` is `INVALID`.\n   *\n   * @see {@link AbstractControl.status}\n   *\n   * @returns True if this control has failed one or more of its validation checks,\n   * false otherwise.\n   */\n  get invalid(): boolean {\n    return this.status === INVALID;\n  }\n\n  /**\n   * A control is `pending` when its `status` is `PENDING`.\n   *\n   * @see {@link AbstractControl.status}\n   *\n   * @returns True if this control is in the process of conducting a validation check,\n   * false otherwise.\n   */\n  get pending(): boolean {\n    return this.status == PENDING;\n  }\n\n  /**\n   * A control is `disabled` when its `status` is `DISABLED`.\n   *\n   * Disabled controls are exempt from validation checks and\n   * are not included in the aggregate value of their ancestor\n   * controls.\n   *\n   * @see {@link AbstractControl.status}\n   *\n   * @returns True if the control is disabled, false otherwise.\n   */\n  get disabled(): boolean {\n    return this.status === DISABLED;\n  }\n\n  /**\n   * A control is `enabled` as long as its `status` is not `DISABLED`.\n   *\n   * @returns True if the control has any status other than 'DISABLED',\n   * false if the status is 'DISABLED'.\n   *\n   * @see {@link AbstractControl.status}\n   *\n   */\n  get enabled(): boolean {\n    return this.status !== DISABLED;\n  }\n\n  /**\n   * An object containing any errors generated by failing validation,\n   * or null if there are no errors.\n   */\n  // TODO(issue/24571): remove '!'.\n  public readonly errors!: ValidationErrors|null;\n\n  /**\n   * A control is `pristine` if the user has not yet changed\n   * the value in the UI.\n   *\n   * @returns True if the user has not yet changed the value in the UI; compare `dirty`.\n   * Programmatic changes to a control's value do not mark it dirty.\n   */\n  public readonly pristine: boolean = true;\n\n  /**\n   * A control is `dirty` if the user has changed the value\n   * in the UI.\n   *\n   * @returns True if the user has changed the value of this control in the UI; compare `pristine`.\n   * Programmatic changes to a control's value do not mark it dirty.\n   */\n  get dirty(): boolean {\n    return !this.pristine;\n  }\n\n  /**\n   * True if the control is marked as `touched`.\n   *\n   * A control is marked `touched` once the user has triggered\n   * a `blur` event on it.\n   */\n  public readonly touched: boolean = false;\n\n  /**\n   * True if the control has not been marked as touched\n   *\n   * A control is `untouched` if the user has not yet triggered\n   * a `blur` event on it.\n   */\n  get untouched(): boolean {\n    return !this.touched;\n  }\n\n  /**\n   * A multicasting observable that emits an event every time the value of the control changes, in\n   * the UI or programmatically. It also emits an event each time you call enable() or disable()\n   * without passing along {emitEvent: false} as a function argument.\n   */\n  // TODO(issue/24571): remove '!'.\n  public readonly valueChanges!: Observable<any>;\n\n  /**\n   * A multicasting observable that emits an event every time the validation `status` of the control\n   * recalculates.\n   *\n   * @see {@link AbstractControl.status}\n   *\n   */\n  // TODO(issue/24571): remove '!'.\n  public readonly statusChanges!: Observable<any>;\n\n  /**\n   * Reports the update strategy of the `AbstractControl` (meaning\n   * the event on which the control updates itself).\n   * Possible values: `'change'` | `'blur'` | `'submit'`\n   * Default value: `'change'`\n   */\n  get updateOn(): FormHooks {\n    return this._updateOn ? this._updateOn : (this.parent ? this.parent.updateOn : 'change');\n  }\n\n  /**\n   * Sets the synchronous validators that are active on this control.  Calling\n   * this overwrites any existing synchronous validators.\n   *\n   * When you add or remove a validator at run time, you must call\n   * `updateValueAndValidity()` for the new validation to take effect.\n   *\n   * If you want to add a new validator without affecting existing ones, consider\n   * using `addValidators()` method instead.\n   */\n  setValidators(validators: ValidatorFn|ValidatorFn[]|null): void {\n    this._rawValidators = validators;\n    this._composedValidatorFn = coerceToValidator(validators);\n  }\n\n  /**\n   * Sets the asynchronous validators that are active on this control. Calling this\n   * overwrites any existing asynchronous validators.\n   *\n   * When you add or remove a validator at run time, you must call\n   * `updateValueAndValidity()` for the new validation to take effect.\n   *\n   * If you want to add a new validator without affecting existing ones, consider\n   * using `addAsyncValidators()` method instead.\n   */\n  setAsyncValidators(validators: AsyncValidatorFn|AsyncValidatorFn[]|null): void {\n    this._rawAsyncValidators = validators;\n    this._composedAsyncValidatorFn = coerceToAsyncValidator(validators);\n  }\n\n  /**\n   * Add a synchronous validator or validators to this control, without affecting other validators.\n   *\n   * When you add or remove a validator at run time, you must call\n   * `updateValueAndValidity()` for the new validation to take effect.\n   *\n   * Adding a validator that already exists will have no effect. If duplicate validator functions\n   * are present in the `validators` array, only the first instance would be added to a form\n   * control.\n   *\n   * @param validators The new validator function or functions to add to this control.\n   */\n  addValidators(validators: ValidatorFn|ValidatorFn[]): void {\n    this.setValidators(addValidators(validators, this._rawValidators));\n  }\n\n  /**\n   * Add an asynchronous validator or validators to this control, without affecting other\n   * validators.\n   *\n   * When you add or remove a validator at run time, you must call\n   * `updateValueAndValidity()` for the new validation to take effect.\n   *\n   * Adding a validator that already exists will have no effect.\n   *\n   * @param validators The new asynchronous validator function or functions to add to this control.\n   */\n  addAsyncValidators(validators: AsyncValidatorFn|AsyncValidatorFn[]): void {\n    this.setAsyncValidators(addValidators(validators, this._rawAsyncValidators));\n  }\n\n  /**\n   * Remove a synchronous validator from this control, without affecting other validators.\n   * Validators are compared by function reference; you must pass a reference to the exact same\n   * validator function as the one that was originally set. If a provided validator is not found,\n   * it is ignored.\n   *\n   * When you add or remove a validator at run time, you must call\n   * `updateValueAndValidity()` for the new validation to take effect.\n   *\n   * @param validators The validator or validators to remove.\n   */\n  removeValidators(validators: ValidatorFn|ValidatorFn[]): void {\n    this.setValidators(removeValidators(validators, this._rawValidators));\n  }\n\n  /**\n   * Remove an asynchronous validator from this control, without affecting other validators.\n   * Validators are compared by function reference; you must pass a reference to the exact same\n   * validator function as the one that was originally set. If a provided validator is not found, it\n   * is ignored.\n   *\n   * When you add or remove a validator at run time, you must call\n   * `updateValueAndValidity()` for the new validation to take effect.\n   *\n   * @param validators The asynchronous validator or validators to remove.\n   */\n  removeAsyncValidators(validators: AsyncValidatorFn|AsyncValidatorFn[]): void {\n    this.setAsyncValidators(removeValidators(validators, this._rawAsyncValidators));\n  }\n\n  /**\n   * Check whether a synchronous validator function is present on this control. The provided\n   * validator must be a reference to the exact same function that was provided.\n   *\n   * @param validator The validator to check for presence. Compared by function reference.\n   * @returns Whether the provided validator was found on this control.\n   */\n  hasValidator(validator: ValidatorFn): boolean {\n    return hasValidator(this._rawValidators, validator);\n  }\n\n  /**\n   * Check whether an asynchronous validator function is present on this control. The provided\n   * validator must be a reference to the exact same function that was provided.\n   *\n   * @param validator The asynchronous validator to check for presence. Compared by function\n   *     reference.\n   * @returns Whether the provided asynchronous validator was found on this control.\n   */\n  hasAsyncValidator(validator: AsyncValidatorFn): boolean {\n    return hasValidator(this._rawAsyncValidators, validator);\n  }\n\n  /**\n   * Empties out the synchronous validator list.\n   *\n   * When you add or remove a validator at run time, you must call\n   * `updateValueAndValidity()` for the new validation to take effect.\n   *\n   */\n  clearValidators(): void {\n    this.validator = null;\n  }\n\n  /**\n   * Empties out the async validator list.\n   *\n   * When you add or remove a validator at run time, you must call\n   * `updateValueAndValidity()` for the new validation to take effect.\n   *\n   */\n  clearAsyncValidators(): void {\n    this.asyncValidator = null;\n  }\n\n  /**\n   * Marks the control as `touched`. A control is touched by focus and\n   * blur events that do not change the value.\n   *\n   * @see `markAsUntouched()`\n   * @see `markAsDirty()`\n   * @see `markAsPristine()`\n   *\n   * @param opts Configuration options that determine how the control propagates changes\n   * and emits events after marking is applied.\n   * * `onlySelf`: When true, mark only this control. When false or not supplied,\n   * marks all direct ancestors. Default is false.\n   */\n  markAsTouched(opts: {onlySelf?: boolean} = {}): void {\n    (this as {touched: boolean}).touched = true;\n\n    if (this._parent && !opts.onlySelf) {\n      this._parent.markAsTouched(opts);\n    }\n  }\n\n  /**\n   * Marks the control and all its descendant controls as `touched`.\n   * @see `markAsTouched()`\n   */\n  markAllAsTouched(): void {\n    this.markAsTouched({onlySelf: true});\n\n    this._forEachChild((control: AbstractControl) => control.markAllAsTouched());\n  }\n\n  /**\n   * Marks the control as `untouched`.\n   *\n   * If the control has any children, also marks all children as `untouched`\n   * and recalculates the `touched` status of all parent controls.\n   *\n   * @see `markAsTouched()`\n   * @see `markAsDirty()`\n   * @see `markAsPristine()`\n   *\n   * @param opts Configuration options that determine how the control propagates changes\n   * and emits events after the marking is applied.\n   * * `onlySelf`: When true, mark only this control. When false or not supplied,\n   * marks all direct ancestors. Default is false.\n   */\n  markAsUntouched(opts: {onlySelf?: boolean} = {}): void {\n    (this as {touched: boolean}).touched = false;\n    this._pendingTouched = false;\n\n    this._forEachChild((control: AbstractControl) => {\n      control.markAsUntouched({onlySelf: true});\n    });\n\n    if (this._parent && !opts.onlySelf) {\n      this._parent._updateTouched(opts);\n    }\n  }\n\n  /**\n   * Marks the control as `dirty`. A control becomes dirty when\n   * the control's value is changed through the UI; compare `markAsTouched`.\n   *\n   * @see `markAsTouched()`\n   * @see `markAsUntouched()`\n   * @see `markAsPristine()`\n   *\n   * @param opts Configuration options that determine how the control propagates changes\n   * and emits events after marking is applied.\n   * * `onlySelf`: When true, mark only this control. When false or not supplied,\n   * marks all direct ancestors. Default is false.\n   */\n  markAsDirty(opts: {onlySelf?: boolean} = {}): void {\n    (this as {pristine: boolean}).pristine = false;\n\n    if (this._parent && !opts.onlySelf) {\n      this._parent.markAsDirty(opts);\n    }\n  }\n\n  /**\n   * Marks the control as `pristine`.\n   *\n   * If the control has any children, marks all children as `pristine`,\n   * and recalculates the `pristine` status of all parent\n   * controls.\n   *\n   * @see `markAsTouched()`\n   * @see `markAsUntouched()`\n   * @see `markAsDirty()`\n   *\n   * @param opts Configuration options that determine how the control emits events after\n   * marking is applied.\n   * * `onlySelf`: When true, mark only this control. When false or not supplied,\n   * marks all direct ancestors. Default is false.\n   */\n  markAsPristine(opts: {onlySelf?: boolean} = {}): void {\n    (this as {pristine: boolean}).pristine = true;\n    this._pendingDirty = false;\n\n    this._forEachChild((control: AbstractControl) => {\n      control.markAsPristine({onlySelf: true});\n    });\n\n    if (this._parent && !opts.onlySelf) {\n      this._parent._updatePristine(opts);\n    }\n  }\n\n  /**\n   * Marks the control as `pending`.\n   *\n   * A control is pending while the control performs async validation.\n   *\n   * @see {@link AbstractControl.status}\n   *\n   * @param opts Configuration options that determine how the control propagates changes and\n   * emits events after marking is applied.\n   * * `onlySelf`: When true, mark only this control. When false or not supplied,\n   * marks all direct ancestors. Default is false.\n   * * `emitEvent`: When true or not supplied (the default), the `statusChanges`\n   * observable emits an event with the latest status the control is marked pending.\n   * When false, no events are emitted.\n   *\n   */\n  markAsPending(opts: {onlySelf?: boolean, emitEvent?: boolean} = {}): void {\n    (this as {status: string}).status = PENDING;\n\n    if (opts.emitEvent !== false) {\n      (this.statusChanges as EventEmitter<any>).emit(this.status);\n    }\n\n    if (this._parent && !opts.onlySelf) {\n      this._parent.markAsPending(opts);\n    }\n  }\n\n  /**\n   * Disables the control. This means the control is exempt from validation checks and\n   * excluded from the aggregate value of any parent. Its status is `DISABLED`.\n   *\n   * If the control has children, all children are also disabled.\n   *\n   * @see {@link AbstractControl.status}\n   *\n   * @param opts Configuration options that determine how the control propagates\n   * changes and emits events after the control is disabled.\n   * * `onlySelf`: When true, mark only this control. When false or not supplied,\n   * marks all direct ancestors. Default is false.\n   * * `emitEvent`: When true or not supplied (the default), both the `statusChanges` and\n   * `valueChanges`\n   * observables emit events with the latest status and value when the control is disabled.\n   * When false, no events are emitted.\n   */\n  disable(opts: {onlySelf?: boolean, emitEvent?: boolean} = {}): void {\n    // If parent has been marked artificially dirty we don't want to re-calculate the\n    // parent's dirtiness based on the children.\n    const skipPristineCheck = this._parentMarkedDirty(opts.onlySelf);\n\n    (this as {status: string}).status = DISABLED;\n    (this as {errors: ValidationErrors | null}).errors = null;\n    this._forEachChild((control: AbstractControl) => {\n      control.disable({...opts, onlySelf: true});\n    });\n    this._updateValue();\n\n    if (opts.emitEvent !== false) {\n      (this.valueChanges as EventEmitter<any>).emit(this.value);\n      (this.statusChanges as EventEmitter<string>).emit(this.status);\n    }\n\n    this._updateAncestors({...opts, skipPristineCheck});\n    this._onDisabledChange.forEach((changeFn) => changeFn(true));\n  }\n\n  /**\n   * Enables the control. This means the control is included in validation checks and\n   * the aggregate value of its parent. Its status recalculates based on its value and\n   * its validators.\n   *\n   * By default, if the control has children, all children are enabled.\n   *\n   * @see {@link AbstractControl.status}\n   *\n   * @param opts Configure options that control how the control propagates changes and\n   * emits events when marked as untouched\n   * * `onlySelf`: When true, mark only this control. When false or not supplied,\n   * marks all direct ancestors. Default is false.\n   * * `emitEvent`: When true or not supplied (the default), both the `statusChanges` and\n   * `valueChanges`\n   * observables emit events with the latest status and value when the control is enabled.\n   * When false, no events are emitted.\n   */\n  enable(opts: {onlySelf?: boolean, emitEvent?: boolean} = {}): void {\n    // If parent has been marked artificially dirty we don't want to re-calculate the\n    // parent's dirtiness based on the children.\n    const skipPristineCheck = this._parentMarkedDirty(opts.onlySelf);\n\n    (this as {status: string}).status = VALID;\n    this._forEachChild((control: AbstractControl) => {\n      control.enable({...opts, onlySelf: true});\n    });\n    this.updateValueAndValidity({onlySelf: true, emitEvent: opts.emitEvent});\n\n    this._updateAncestors({...opts, skipPristineCheck});\n    this._onDisabledChange.forEach((changeFn) => changeFn(false));\n  }\n\n  private _updateAncestors(\n      opts: {onlySelf?: boolean, emitEvent?: boolean, skipPristineCheck?: boolean}) {\n    if (this._parent && !opts.onlySelf) {\n      this._parent.updateValueAndValidity(opts);\n      if (!opts.skipPristineCheck) {\n        this._parent._updatePristine();\n      }\n      this._parent._updateTouched();\n    }\n  }\n\n  /**\n   * @param parent Sets the parent of the control\n   */\n  setParent(parent: FormGroup|FormArray): void {\n    this._parent = parent;\n  }\n\n  /**\n   * Sets the value of the control. Abstract method (implemented in sub-classes).\n   */\n  abstract setValue(value: any, options?: Object): void;\n\n  /**\n   * Patches the value of the control. Abstract method (implemented in sub-classes).\n   */\n  abstract patchValue(value: any, options?: Object): void;\n\n  /**\n   * Resets the control. Abstract method (implemented in sub-classes).\n   */\n  abstract reset(value?: any, options?: Object): void;\n\n  /**\n   * Recalculates the value and validation status of the control.\n   *\n   * By default, it also updates the value and validity of its ancestors.\n   *\n   * @param opts Configuration options determine how the control propagates changes and emits events\n   * after updates and validity checks are applied.\n   * * `onlySelf`: When true, only update this control. When false or not supplied,\n   * update all direct ancestors. Default is false.\n   * * `emitEvent`: When true or not supplied (the default), both the `statusChanges` and\n   * `valueChanges`\n   * observables emit events with the latest status and value when the control is updated.\n   * When false, no events are emitted.\n   */\n  updateValueAndValidity(opts: {onlySelf?: boolean, emitEvent?: boolean} = {}): void {\n    this._setInitialStatus();\n    this._updateValue();\n\n    if (this.enabled) {\n      this._cancelExistingSubscription();\n      (this as {errors: ValidationErrors | null}).errors = this._runValidator();\n      (this as {status: string}).status = this._calculateStatus();\n\n      if (this.status === VALID || this.status === PENDING) {\n        this._runAsyncValidator(opts.emitEvent);\n      }\n    }\n\n    if (opts.emitEvent !== false) {\n      (this.valueChanges as EventEmitter<any>).emit(this.value);\n      (this.statusChanges as EventEmitter<string>).emit(this.status);\n    }\n\n    if (this._parent && !opts.onlySelf) {\n      this._parent.updateValueAndValidity(opts);\n    }\n  }\n\n  /** @internal */\n  _updateTreeValidity(opts: {emitEvent?: boolean} = {emitEvent: true}) {\n    this._forEachChild((ctrl: AbstractControl) => ctrl._updateTreeValidity(opts));\n    this.updateValueAndValidity({onlySelf: true, emitEvent: opts.emitEvent});\n  }\n\n  private _setInitialStatus() {\n    (this as {status: string}).status = this._allControlsDisabled() ? DISABLED : VALID;\n  }\n\n  private _runValidator(): ValidationErrors|null {\n    return this.validator ? this.validator(this) : null;\n  }\n\n  private _runAsyncValidator(emitEvent?: boolean): void {\n    if (this.asyncValidator) {\n      (this as {status: string}).status = PENDING;\n      this._hasOwnPendingAsyncValidator = true;\n      const obs = toObservable(this.asyncValidator(this));\n      this._asyncValidationSubscription = obs.subscribe((errors: ValidationErrors|null) => {\n        this._hasOwnPendingAsyncValidator = false;\n        // This will trigger the recalculation of the validation status, which depends on\n        // the state of the asynchronous validation (whether it is in progress or not). So, it is\n        // necessary that we have updated the `_hasOwnPendingAsyncValidator` boolean flag first.\n        this.setErrors(errors, {emitEvent});\n      });\n    }\n  }\n\n  private _cancelExistingSubscription(): void {\n    if (this._asyncValidationSubscription) {\n      this._asyncValidationSubscription.unsubscribe();\n      this._hasOwnPendingAsyncValidator = false;\n    }\n  }\n\n  /**\n   * Sets errors on a form control when running validations manually, rather than automatically.\n   *\n   * Calling `setErrors` also updates the validity of the parent control.\n   *\n   * @usageNotes\n   *\n   * ### Manually set the errors for a control\n   *\n   * ```\n   * const login = new FormControl('someLogin');\n   * login.setErrors({\n   *   notUnique: true\n   * });\n   *\n   * expect(login.valid).toEqual(false);\n   * expect(login.errors).toEqual({ notUnique: true });\n   *\n   * login.setValue('someOtherLogin');\n   *\n   * expect(login.valid).toEqual(true);\n   * ```\n   */\n  setErrors(errors: ValidationErrors|null, opts: {emitEvent?: boolean} = {}): void {\n    (this as {errors: ValidationErrors | null}).errors = errors;\n    this._updateControlsErrors(opts.emitEvent !== false);\n  }\n\n  /**\n   * Retrieves a child control given the control's name or path.\n   *\n   * @param path A dot-delimited string or array of string/number values that define the path to the\n   * control.\n   *\n   * @usageNotes\n   * ### Retrieve a nested control\n   *\n   * For example, to get a `name` control nested within a `person` sub-group:\n   *\n   * * `this.form.get('person.name');`\n   *\n   * -OR-\n   *\n   * * `this.form.get(['person', 'name']);`\n   *\n   * ### Retrieve a control in a FormArray\n   *\n   * When accessing an element inside a FormArray, you can use an element index.\n   * For example, to get a `price` control from the first element in an `items` array you can use:\n   *\n   * * `this.form.get('items.0.price');`\n   *\n   * -OR-\n   *\n   * * `this.form.get(['items', 0, 'price']);`\n   */\n  get(path: Array<string|number>|string): AbstractControl|null {\n    return _find(this, path, '.');\n  }\n\n  /**\n   * @description\n   * Reports error data for the control with the given path.\n   *\n   * @param errorCode The code of the error to check\n   * @param path A list of control names that designates how to move from the current control\n   * to the control that should be queried for errors.\n   *\n   * @usageNotes\n   * For example, for the following `FormGroup`:\n   *\n   * ```\n   * form = new FormGroup({\n   *   address: new FormGroup({ street: new FormControl() })\n   * });\n   * ```\n   *\n   * The path to the 'street' control from the root form would be 'address' -> 'street'.\n   *\n   * It can be provided to this method in one of two formats:\n   *\n   * 1. An array of string control names, e.g. `['address', 'street']`\n   * 1. A period-delimited list of control names in one string, e.g. `'address.street'`\n   *\n   * @returns error data for that particular error. If the control or error is not present,\n   * null is returned.\n   */\n  getError(errorCode: string, path?: Array<string|number>|string): any {\n    const control = path ? this.get(path) : this;\n    return control && control.errors ? control.errors[errorCode] : null;\n  }\n\n  /**\n   * @description\n   * Reports whether the control with the given path has the error specified.\n   *\n   * @param errorCode The code of the error to check\n   * @param path A list of control names that designates how to move from the current control\n   * to the control that should be queried for errors.\n   *\n   * @usageNotes\n   * For example, for the following `FormGroup`:\n   *\n   * ```\n   * form = new FormGroup({\n   *   address: new FormGroup({ street: new FormControl() })\n   * });\n   * ```\n   *\n   * The path to the 'street' control from the root form would be 'address' -> 'street'.\n   *\n   * It can be provided to this method in one of two formats:\n   *\n   * 1. An array of string control names, e.g. `['address', 'street']`\n   * 1. A period-delimited list of control names in one string, e.g. `'address.street'`\n   *\n   * If no path is given, this method checks for the error on the current control.\n   *\n   * @returns whether the given error is present in the control at the given path.\n   *\n   * If the control is not present, false is returned.\n   */\n  hasError(errorCode: string, path?: Array<string|number>|string): boolean {\n    return !!this.getError(errorCode, path);\n  }\n\n  /**\n   * Retrieves the top-level ancestor of this control.\n   */\n  get root(): AbstractControl {\n    let x: AbstractControl = this;\n\n    while (x._parent) {\n      x = x._parent;\n    }\n\n    return x;\n  }\n\n  /** @internal */\n  _updateControlsErrors(emitEvent: boolean): void {\n    (this as {status: string}).status = this._calculateStatus();\n\n    if (emitEvent) {\n      (this.statusChanges as EventEmitter<string>).emit(this.status);\n    }\n\n    if (this._parent) {\n      this._parent._updateControlsErrors(emitEvent);\n    }\n  }\n\n  /** @internal */\n  _initObservables() {\n    (this as {valueChanges: Observable<any>}).valueChanges = new EventEmitter();\n    (this as {statusChanges: Observable<any>}).statusChanges = new EventEmitter();\n  }\n\n\n  private _calculateStatus(): string {\n    if (this._allControlsDisabled()) return DISABLED;\n    if (this.errors) return INVALID;\n    if (this._hasOwnPendingAsyncValidator || this._anyControlsHaveStatus(PENDING)) return PENDING;\n    if (this._anyControlsHaveStatus(INVALID)) return INVALID;\n    return VALID;\n  }\n\n  /** @internal */\n  abstract _updateValue(): void;\n\n  /** @internal */\n  abstract _forEachChild(cb: Function): void;\n\n  /** @internal */\n  abstract _anyControls(condition: Function): boolean;\n\n  /** @internal */\n  abstract _allControlsDisabled(): boolean;\n\n  /** @internal */\n  abstract _syncPendingControls(): boolean;\n\n  /** @internal */\n  _anyControlsHaveStatus(status: string): boolean {\n    return this._anyControls((control: AbstractControl) => control.status === status);\n  }\n\n  /** @internal */\n  _anyControlsDirty(): boolean {\n    return this._anyControls((control: AbstractControl) => control.dirty);\n  }\n\n  /** @internal */\n  _anyControlsTouched(): boolean {\n    return this._anyControls((control: AbstractControl) => control.touched);\n  }\n\n  /** @internal */\n  _updatePristine(opts: {onlySelf?: boolean} = {}): void {\n    (this as {pristine: boolean}).pristine = !this._anyControlsDirty();\n\n    if (this._parent && !opts.onlySelf) {\n      this._parent._updatePristine(opts);\n    }\n  }\n\n  /** @internal */\n  _updateTouched(opts: {onlySelf?: boolean} = {}): void {\n    (this as {touched: boolean}).touched = this._anyControlsTouched();\n\n    if (this._parent && !opts.onlySelf) {\n      this._parent._updateTouched(opts);\n    }\n  }\n\n  /** @internal */\n  _onDisabledChange: Function[] = [];\n\n  /** @internal */\n  _isBoxedValue(formState: any): boolean {\n    return typeof formState === 'object' && formState !== null &&\n        Object.keys(formState).length === 2 && 'value' in formState && 'disabled' in formState;\n  }\n\n  /** @internal */\n  _registerOnCollectionChange(fn: () => void): void {\n    this._onCollectionChange = fn;\n  }\n\n  /** @internal */\n  _setUpdateStrategy(opts?: ValidatorFn|ValidatorFn[]|AbstractControlOptions|null): void {\n    if (isOptionsObj(opts) && opts.updateOn != null) {\n      this._updateOn = opts.updateOn!;\n    }\n  }\n\n  /**\n   * Check to see if parent has been marked artificially dirty.\n   *\n   * @internal\n   */\n  private _parentMarkedDirty(onlySelf?: boolean): boolean {\n    const parentDirty = this._parent && this._parent.dirty;\n    return !onlySelf && !!parentDirty && !this._parent!._anyControlsDirty();\n  }\n}\n\n/**\n * Tracks the value and validation status of an individual form control.\n *\n * This is one of the three fundamental building blocks of Angular forms, along with\n * `FormGroup` and `FormArray`. It extends the `AbstractControl` class that\n * implements most of the base functionality for accessing the value, validation status,\n * user interactions and events. See [usage examples below](#usage-notes).\n *\n * @see `AbstractControl`\n * @see [Reactive Forms Guide](guide/reactive-forms)\n * @see [Usage Notes](#usage-notes)\n *\n * @usageNotes\n *\n * ### Initializing Form Controls\n *\n * Instantiate a `FormControl`, with an initial value.\n *\n * ```ts\n * const control = new FormControl('some value');\n * console.log(control.value);     // 'some value'\n *```\n *\n * The following example initializes the control with a form state object. The `value`\n * and `disabled` keys are required in this case.\n *\n * ```ts\n * const control = new FormControl({ value: 'n/a', disabled: true });\n * console.log(control.value);     // 'n/a'\n * console.log(control.status);    // 'DISABLED'\n * ```\n *\n * The following example initializes the control with a synchronous validator.\n *\n * ```ts\n * const control = new FormControl('', Validators.required);\n * console.log(control.value);      // ''\n * console.log(control.status);     // 'INVALID'\n * ```\n *\n * The following example initializes the control using an options object.\n *\n * ```ts\n * const control = new FormControl('', {\n *    validators: Validators.required,\n *    asyncValidators: myAsyncValidator\n * });\n * ```\n *\n * ### Configure the control to update on a blur event\n *\n * Set the `updateOn` option to `'blur'` to update on the blur `event`.\n *\n * ```ts\n * const control = new FormControl('', { updateOn: 'blur' });\n * ```\n *\n * ### Configure the control to update on a submit event\n *\n * Set the `updateOn` option to `'submit'` to update on a submit `event`.\n *\n * ```ts\n * const control = new FormControl('', { updateOn: 'submit' });\n * ```\n *\n * ### Reset the control back to an initial value\n *\n * You reset to a specific form state by passing through a standalone\n * value or a form state object that contains both a value and a disabled state\n * (these are the only two properties that cannot be calculated).\n *\n * ```ts\n * const control = new FormControl('Nancy');\n *\n * console.log(control.value); // 'Nancy'\n *\n * control.reset('Drew');\n *\n * console.log(control.value); // 'Drew'\n * ```\n *\n * ### Reset the control back to an initial value and disabled\n *\n * ```\n * const control = new FormControl('Nancy');\n *\n * console.log(control.value); // 'Nancy'\n * console.log(control.status); // 'VALID'\n *\n * control.reset({ value: 'Drew', disabled: true });\n *\n * console.log(control.value); // 'Drew'\n * console.log(control.status); // 'DISABLED'\n * ```\n *\n * @publicApi\n */\nexport class FormControl extends AbstractControl {\n  /** @internal */\n  _onChange: Function[] = [];\n\n  /** @internal */\n  _pendingValue: any;\n\n  /** @internal */\n  _pendingChange: any;\n\n  /**\n   * Creates a new `FormControl` instance.\n   *\n   * @param formState Initializes the control with an initial value,\n   * or an object that defines the initial value and disabled state.\n   *\n   * @param validatorOrOpts A synchronous validator function, or an array of\n   * such functions, or an `AbstractControlOptions` object that contains validation functions\n   * and a validation trigger.\n   *\n   * @param asyncValidator A single async validator or array of async validator functions\n   *\n   */\n  constructor(\n      formState: any = null,\n      validatorOrOpts?: ValidatorFn|ValidatorFn[]|AbstractControlOptions|null,\n      asyncValidator?: AsyncValidatorFn|AsyncValidatorFn[]|null) {\n    super(pickValidators(validatorOrOpts), pickAsyncValidators(asyncValidator, validatorOrOpts));\n    this._applyFormState(formState);\n    this._setUpdateStrategy(validatorOrOpts);\n    this._initObservables();\n    this.updateValueAndValidity({\n      onlySelf: true,\n      // If `asyncValidator` is present, it will trigger control status change from `PENDING` to\n      // `VALID` or `INVALID`.\n      // The status should be broadcasted via the `statusChanges` observable, so we set `emitEvent`\n      // to `true` to allow that during the control creation process.\n      emitEvent: !!this.asyncValidator\n    });\n  }\n\n  /**\n   * Sets a new value for the form control.\n   *\n   * @param value The new value for the control.\n   * @param options Configuration options that determine how the control propagates changes\n   * and emits events when the value changes.\n   * The configuration options are passed to the {@link AbstractControl#updateValueAndValidity\n   * updateValueAndValidity} method.\n   *\n   * * `onlySelf`: When true, each change only affects this control, and not its parent. Default is\n   * false.\n   * * `emitEvent`: When true or not supplied (the default), both the `statusChanges` and\n   * `valueChanges`\n   * observables emit events with the latest status and value when the control value is updated.\n   * When false, no events are emitted.\n   * * `emitModelToViewChange`: When true or not supplied  (the default), each change triggers an\n   * `onChange` event to\n   * update the view.\n   * * `emitViewToModelChange`: When true or not supplied (the default), each change triggers an\n   * `ngModelChange`\n   * event to update the model.\n   *\n   */\n  override setValue(value: any, options: {\n    onlySelf?: boolean,\n    emitEvent?: boolean,\n    emitModelToViewChange?: boolean,\n    emitViewToModelChange?: boolean\n  } = {}): void {\n    (this as {value: any}).value = this._pendingValue = value;\n    if (this._onChange.length && options.emitModelToViewChange !== false) {\n      this._onChange.forEach(\n          (changeFn) => changeFn(this.value, options.emitViewToModelChange !== false));\n    }\n    this.updateValueAndValidity(options);\n  }\n\n  /**\n   * Patches the value of a control.\n   *\n   * This function is functionally the same as {@link FormControl#setValue setValue} at this level.\n   * It exists for symmetry with {@link FormGroup#patchValue patchValue} on `FormGroups` and\n   * `FormArrays`, where it does behave differently.\n   *\n   * @see `setValue` for options\n   */\n  override patchValue(value: any, options: {\n    onlySelf?: boolean,\n    emitEvent?: boolean,\n    emitModelToViewChange?: boolean,\n    emitViewToModelChange?: boolean\n  } = {}): void {\n    this.setValue(value, options);\n  }\n\n  /**\n   * Resets the form control, marking it `pristine` and `untouched`, and setting\n   * the value to null.\n   *\n   * @param formState Resets the control with an initial value,\n   * or an object that defines the initial value and disabled state.\n   *\n   * @param options Configuration options that determine how the control propagates changes\n   * and emits events after the value changes.\n   *\n   * * `onlySelf`: When true, each change only affects this control, and not its parent. Default is\n   * false.\n   * * `emitEvent`: When true or not supplied (the default), both the `statusChanges` and\n   * `valueChanges`\n   * observables emit events with the latest status and value when the control is reset.\n   * When false, no events are emitted.\n   *\n   */\n  override reset(formState: any = null, options: {onlySelf?: boolean, emitEvent?: boolean} = {}):\n      void {\n    this._applyFormState(formState);\n    this.markAsPristine(options);\n    this.markAsUntouched(options);\n    this.setValue(this.value, options);\n    this._pendingChange = false;\n  }\n\n  /**\n   * @internal\n   */\n  override _updateValue() {}\n\n  /**\n   * @internal\n   */\n  override _anyControls(condition: Function): boolean {\n    return false;\n  }\n\n  /**\n   * @internal\n   */\n  override _allControlsDisabled(): boolean {\n    return this.disabled;\n  }\n\n  /**\n   * Register a listener for change events.\n   *\n   * @param fn The method that is called when the value changes\n   */\n  registerOnChange(fn: Function): void {\n    this._onChange.push(fn);\n  }\n\n  /**\n   * Internal function to unregister a change events listener.\n   * @internal\n   */\n  _unregisterOnChange(fn: Function): void {\n    removeListItem(this._onChange, fn);\n  }\n\n  /**\n   * Register a listener for disabled events.\n   *\n   * @param fn The method that is called when the disabled status changes.\n   */\n  registerOnDisabledChange(fn: (isDisabled: boolean) => void): void {\n    this._onDisabledChange.push(fn);\n  }\n\n  /**\n   * Internal function to unregister a disabled event listener.\n   * @internal\n   */\n  _unregisterOnDisabledChange(fn: (isDisabled: boolean) => void): void {\n    removeListItem(this._onDisabledChange, fn);\n  }\n\n  /**\n   * @internal\n   */\n  override _forEachChild(cb: Function): void {}\n\n  /** @internal */\n  override _syncPendingControls(): boolean {\n    if (this.updateOn === 'submit') {\n      if (this._pendingDirty) this.markAsDirty();\n      if (this._pendingTouched) this.markAsTouched();\n      if (this._pendingChange) {\n        this.setValue(this._pendingValue, {onlySelf: true, emitModelToViewChange: false});\n        return true;\n      }\n    }\n    return false;\n  }\n\n  private _applyFormState(formState: any) {\n    if (this._isBoxedValue(formState)) {\n      (this as {value: any}).value = this._pendingValue = formState.value;\n      formState.disabled ? this.disable({onlySelf: true, emitEvent: false}) :\n                           this.enable({onlySelf: true, emitEvent: false});\n    } else {\n      (this as {value: any}).value = this._pendingValue = formState;\n    }\n  }\n}\n\n/**\n * Tracks the value and validity state of a group of `FormControl` instances.\n *\n * A `FormGroup` aggregates the values of each child `FormControl` into one object,\n * with each control name as the key.  It calculates its status by reducing the status values\n * of its children. For example, if one of the controls in a group is invalid, the entire\n * group becomes invalid.\n *\n * `FormGroup` is one of the three fundamental building blocks used to define forms in Angular,\n * along with `FormControl` and `FormArray`.\n *\n * When instantiating a `FormGroup`, pass in a collection of child controls as the first\n * argument. The key for each child registers the name for the control.\n *\n * @usageNotes\n *\n * ### Create a form group with 2 controls\n *\n * ```\n * const form = new FormGroup({\n *   first: new FormControl('Nancy', Validators.minLength(2)),\n *   last: new FormControl('Drew'),\n * });\n *\n * console.log(form.value);   // {first: 'Nancy', last; 'Drew'}\n * console.log(form.status);  // 'VALID'\n * ```\n *\n * ### Create a form group with a group-level validator\n *\n * You include group-level validators as the second arg, or group-level async\n * validators as the third arg. These come in handy when you want to perform validation\n * that considers the value of more than one child control.\n *\n * ```\n * const form = new FormGroup({\n *   password: new FormControl('', Validators.minLength(2)),\n *   passwordConfirm: new FormControl('', Validators.minLength(2)),\n * }, passwordMatchValidator);\n *\n *\n * function passwordMatchValidator(g: FormGroup) {\n *    return g.get('password').value === g.get('passwordConfirm').value\n *       ? null : {'mismatch': true};\n * }\n * ```\n *\n * Like `FormControl` instances, you choose to pass in\n * validators and async validators as part of an options object.\n *\n * ```\n * const form = new FormGroup({\n *   password: new FormControl('')\n *   passwordConfirm: new FormControl('')\n * }, { validators: passwordMatchValidator, asyncValidators: otherValidator });\n * ```\n *\n * ### Set the updateOn property for all controls in a form group\n *\n * The options object is used to set a default value for each child\n * control's `updateOn` property. If you set `updateOn` to `'blur'` at the\n * group level, all child controls default to 'blur', unless the child\n * has explicitly specified a different `updateOn` value.\n *\n * ```ts\n * const c = new FormGroup({\n *   one: new FormControl()\n * }, { updateOn: 'blur' });\n * ```\n *\n * @publicApi\n */\nexport class FormGroup extends AbstractControl {\n  /**\n   * Creates a new `FormGroup` instance.\n   *\n   * @param controls A collection of child controls. The key for each child is the name\n   * under which it is registered.\n   *\n   * @param validatorOrOpts A synchronous validator function, or an array of\n   * such functions, or an `AbstractControlOptions` object that contains validation functions\n   * and a validation trigger.\n   *\n   * @param asyncValidator A single async validator or array of async validator functions\n   *\n   */\n  constructor(\n      public controls: {[key: string]: AbstractControl},\n      validatorOrOpts?: ValidatorFn|ValidatorFn[]|AbstractControlOptions|null,\n      asyncValidator?: AsyncValidatorFn|AsyncValidatorFn[]|null) {\n    super(pickValidators(validatorOrOpts), pickAsyncValidators(asyncValidator, validatorOrOpts));\n    this._initObservables();\n    this._setUpdateStrategy(validatorOrOpts);\n    this._setUpControls();\n    this.updateValueAndValidity({\n      onlySelf: true,\n      // If `asyncValidator` is present, it will trigger control status change from `PENDING` to\n      // `VALID` or `INVALID`. The status should be broadcasted via the `statusChanges` observable,\n      // so we set `emitEvent` to `true` to allow that during the control creation process.\n      emitEvent: !!this.asyncValidator\n    });\n  }\n\n  /**\n   * Registers a control with the group's list of controls.\n   *\n   * This method does not update the value or validity of the control.\n   * Use {@link FormGroup#addControl addControl} instead.\n   *\n   * @param name The control name to register in the collection\n   * @param control Provides the control for the given name\n   */\n  registerControl(name: string, control: AbstractControl): AbstractControl {\n    if (this.controls[name]) return this.controls[name];\n    this.controls[name] = control;\n    control.setParent(this);\n    control._registerOnCollectionChange(this._onCollectionChange);\n    return control;\n  }\n\n  /**\n   * Add a control to this group.\n   *\n   * If a control with a given name already exists, it would *not* be replaced with a new one.\n   * If you want to replace an existing control, use the {@link FormGroup#setControl setControl}\n   * method instead. This method also updates the value and validity of the control.\n   *\n   * @param name The control name to add to the collection\n   * @param control Provides the control for the given name\n   * @param options Specifies whether this FormGroup instance should emit events after a new\n   *     control is added.\n   * * `emitEvent`: When true or not supplied (the default), both the `statusChanges` and\n   * `valueChanges` observables emit events with the latest status and value when the control is\n   * added. When false, no events are emitted.\n   */\n  addControl(name: string, control: AbstractControl, options: {emitEvent?: boolean} = {}): void {\n    this.registerControl(name, control);\n    this.updateValueAndValidity({emitEvent: options.emitEvent});\n    this._onCollectionChange();\n  }\n\n  /**\n   * Remove a control from this group.\n   *\n   * This method also updates the value and validity of the control.\n   *\n   * @param name The control name to remove from the collection\n   * @param options Specifies whether this FormGroup instance should emit events after a\n   *     control is removed.\n   * * `emitEvent`: When true or not supplied (the default), both the `statusChanges` and\n   * `valueChanges` observables emit events with the latest status and value when the control is\n   * removed. When false, no events are emitted.\n   */\n  removeControl(name: string, options: {emitEvent?: boolean} = {}): void {\n    if (this.controls[name]) this.controls[name]._registerOnCollectionChange(() => {});\n    delete (this.controls[name]);\n    this.updateValueAndValidity({emitEvent: options.emitEvent});\n    this._onCollectionChange();\n  }\n\n  /**\n   * Replace an existing control.\n   *\n   * If a control with a given name does not exist in this `FormGroup`, it will be added.\n   *\n   * @param name The control name to replace in the collection\n   * @param control Provides the control for the given name\n   * @param options Specifies whether this FormGroup instance should emit events after an\n   *     existing control is replaced.\n   * * `emitEvent`: When true or not supplied (the default), both the `statusChanges` and\n   * `valueChanges` observables emit events with the latest status and value when the control is\n   * replaced with a new one. When false, no events are emitted.\n   */\n  setControl(name: string, control: AbstractControl, options: {emitEvent?: boolean} = {}): void {\n    if (this.controls[name]) this.controls[name]._registerOnCollectionChange(() => {});\n    delete (this.controls[name]);\n    if (control) this.registerControl(name, control);\n    this.updateValueAndValidity({emitEvent: options.emitEvent});\n    this._onCollectionChange();\n  }\n\n  /**\n   * Check whether there is an enabled control with the given name in the group.\n   *\n   * Reports false for disabled controls. If you'd like to check for existence in the group\n   * only, use {@link AbstractControl#get get} instead.\n   *\n   * @param controlName The control name to check for existence in the collection\n   *\n   * @returns false for disabled controls, true otherwise.\n   */\n  contains(controlName: string): boolean {\n    return this.controls.hasOwnProperty(controlName) && this.controls[controlName].enabled;\n  }\n\n  /**\n   * Sets the value of the `FormGroup`. It accepts an object that matches\n   * the structure of the group, with control names as keys.\n   *\n   * @usageNotes\n   * ### Set the complete value for the form group\n   *\n   * ```\n   * const form = new FormGroup({\n   *   first: new FormControl(),\n   *   last: new FormControl()\n   * });\n   *\n   * console.log(form.value);   // {first: null, last: null}\n   *\n   * form.setValue({first: 'Nancy', last: 'Drew'});\n   * console.log(form.value);   // {first: 'Nancy', last: 'Drew'}\n   * ```\n   *\n   * @throws When strict checks fail, such as setting the value of a control\n   * that doesn't exist or if you exclude a value of a control that does exist.\n   *\n   * @param value The new value for the control that matches the structure of the group.\n   * @param options Configuration options that determine how the control propagates changes\n   * and emits events after the value changes.\n   * The configuration options are passed to the {@link AbstractControl#updateValueAndValidity\n   * updateValueAndValidity} method.\n   *\n   * * `onlySelf`: When true, each change only affects this control, and not its parent. Default is\n   * false.\n   * * `emitEvent`: When true or not supplied (the default), both the `statusChanges` and\n   * `valueChanges`\n   * observables emit events with the latest status and value when the control value is updated.\n   * When false, no events are emitted.\n   */\n  override setValue(\n      value: {[key: string]: any}, options: {onlySelf?: boolean, emitEvent?: boolean} = {}): void {\n    this._checkAllValuesPresent(value);\n    Object.keys(value).forEach(name => {\n      this._throwIfControlMissing(name);\n      this.controls[name].setValue(value[name], {onlySelf: true, emitEvent: options.emitEvent});\n    });\n    this.updateValueAndValidity(options);\n  }\n\n  /**\n   * Patches the value of the `FormGroup`. It accepts an object with control\n   * names as keys, and does its best to match the values to the correct controls\n   * in the group.\n   *\n   * It accepts both super-sets and sub-sets of the group without throwing an error.\n   *\n   * @usageNotes\n   * ### Patch the value for a form group\n   *\n   * ```\n   * const form = new FormGroup({\n   *    first: new FormControl(),\n   *    last: new FormControl()\n   * });\n   * console.log(form.value);   // {first: null, last: null}\n   *\n   * form.patchValue({first: 'Nancy'});\n   * console.log(form.value);   // {first: 'Nancy', last: null}\n   * ```\n   *\n   * @param value The object that matches the structure of the group.\n   * @param options Configuration options that determine how the control propagates changes and\n   * emits events after the value is patched.\n   * * `onlySelf`: When true, each change only affects this control and not its parent. Default is\n   * true.\n   * * `emitEvent`: When true or not supplied (the default), both the `statusChanges` and\n   * `valueChanges` observables emit events with the latest status and value when the control value\n   * is updated. When false, no events are emitted. The configuration options are passed to\n   * the {@link AbstractControl#updateValueAndValidity updateValueAndValidity} method.\n   */\n  override patchValue(\n      value: {[key: string]: any}, options: {onlySelf?: boolean, emitEvent?: boolean} = {}): void {\n    // Even though the `value` argument type doesn't allow `null` and `undefined` values, the\n    // `patchValue` can be called recursively and inner data structures might have these values, so\n    // we just ignore such cases when a field containing FormGroup instance receives `null` or\n    // `undefined` as a value.\n    if (value == null /* both `null` and `undefined` */) return;\n\n    Object.keys(value).forEach(name => {\n      if (this.controls[name]) {\n        this.controls[name].patchValue(value[name], {onlySelf: true, emitEvent: options.emitEvent});\n      }\n    });\n    this.updateValueAndValidity(options);\n  }\n\n  /**\n   * Resets the `FormGroup`, marks all descendants `pristine` and `untouched` and sets\n   * the value of all descendants to null.\n   *\n   * You reset to a specific form state by passing in a map of states\n   * that matches the structure of your form, with control names as keys. The state\n   * is a standalone value or a form state object with both a value and a disabled\n   * status.\n   *\n   * @param value Resets the control with an initial value,\n   * or an object that defines the initial value and disabled state.\n   *\n   * @param options Configuration options that determine how the control propagates changes\n   * and emits events when the group is reset.\n   * * `onlySelf`: When true, each change only affects this control, and not its parent. Default is\n   * false.\n   * * `emitEvent`: When true or not supplied (the default), both the `statusChanges` and\n   * `valueChanges`\n   * observables emit events with the latest status and value when the control is reset.\n   * When false, no events are emitted.\n   * The configuration options are passed to the {@link AbstractControl#updateValueAndValidity\n   * updateValueAndValidity} method.\n   *\n   * @usageNotes\n   *\n   * ### Reset the form group values\n   *\n   * ```ts\n   * const form = new FormGroup({\n   *   first: new FormControl('first name'),\n   *   last: new FormControl('last name')\n   * });\n   *\n   * console.log(form.value);  // {first: 'first name', last: 'last name'}\n   *\n   * form.reset({ first: 'name', last: 'last name' });\n   *\n   * console.log(form.value);  // {first: 'name', last: 'last name'}\n   * ```\n   *\n   * ### Reset the form group values and disabled status\n   *\n   * ```\n   * const form = new FormGroup({\n   *   first: new FormControl('first name'),\n   *   last: new FormControl('last name')\n   * });\n   *\n   * form.reset({\n   *   first: {value: 'name', disabled: true},\n   *   last: 'last'\n   * });\n   *\n   * console.log(form.value);  // {last: 'last'}\n   * console.log(form.get('first').status);  // 'DISABLED'\n   * ```\n   */\n  override reset(value: any = {}, options: {onlySelf?: boolean, emitEvent?: boolean} = {}): void {\n    this._forEachChild((control: AbstractControl, name: string) => {\n      control.reset(value[name], {onlySelf: true, emitEvent: options.emitEvent});\n    });\n    this._updatePristine(options);\n    this._updateTouched(options);\n    this.updateValueAndValidity(options);\n  }\n\n  /**\n   * The aggregate value of the `FormGroup`, including any disabled controls.\n   *\n   * Retrieves all values regardless of disabled status.\n   * The `value` property is the best way to get the value of the group, because\n   * it excludes disabled controls in the `FormGroup`.\n   */\n  getRawValue(): any {\n    return this._reduceChildren(\n        {}, (acc: {[k: string]: AbstractControl}, control: AbstractControl, name: string) => {\n          acc[name] = control instanceof FormControl ? control.value : (<any>control).getRawValue();\n          return acc;\n        });\n  }\n\n  /** @internal */\n  override _syncPendingControls(): boolean {\n    let subtreeUpdated = this._reduceChildren(false, (updated: boolean, child: AbstractControl) => {\n      return child._syncPendingControls() ? true : updated;\n    });\n    if (subtreeUpdated) this.updateValueAndValidity({onlySelf: true});\n    return subtreeUpdated;\n  }\n\n  /** @internal */\n  _throwIfControlMissing(name: string): void {\n    if (!Object.keys(this.controls).length) {\n      throw new Error(`\n        There are no form controls registered with this group yet. If you're using ngModel,\n        you may want to check next tick (e.g. use setTimeout).\n      `);\n    }\n    if (!this.controls[name]) {\n      throw new Error(`Cannot find form control with name: ${name}.`);\n    }\n  }\n\n  /** @internal */\n  override _forEachChild(cb: (v: any, k: string) => void): void {\n    Object.keys(this.controls).forEach(key => {\n      // The list of controls can change (for ex. controls might be removed) while the loop\n      // is running (as a result of invoking Forms API in `valueChanges` subscription), so we\n      // have to null check before invoking the callback.\n      const control = this.controls[key];\n      control && cb(control, key);\n    });\n  }\n\n  /** @internal */\n  _setUpControls(): void {\n    this._forEachChild((control: AbstractControl) => {\n      control.setParent(this);\n      control._registerOnCollectionChange(this._onCollectionChange);\n    });\n  }\n\n  /** @internal */\n  override _updateValue(): void {\n    (this as {value: any}).value = this._reduceValue();\n  }\n\n  /** @internal */\n  override _anyControls(condition: Function): boolean {\n    for (const controlName of Object.keys(this.controls)) {\n      const control = this.controls[controlName];\n      if (this.contains(controlName) && condition(control)) {\n        return true;\n      }\n    }\n    return false;\n  }\n\n  /** @internal */\n  _reduceValue() {\n    return this._reduceChildren(\n        {}, (acc: {[k: string]: AbstractControl}, control: AbstractControl, name: string) => {\n          if (control.enabled || this.disabled) {\n            acc[name] = control.value;\n          }\n          return acc;\n        });\n  }\n\n  /** @internal */\n  _reduceChildren(initValue: any, fn: Function) {\n    let res = initValue;\n    this._forEachChild((control: AbstractControl, name: string) => {\n      res = fn(res, control, name);\n    });\n    return res;\n  }\n\n  /** @internal */\n  override _allControlsDisabled(): boolean {\n    for (const controlName of Object.keys(this.controls)) {\n      if (this.controls[controlName].enabled) {\n        return false;\n      }\n    }\n    return Object.keys(this.controls).length > 0 || this.disabled;\n  }\n\n  /** @internal */\n  _checkAllValuesPresent(value: any): void {\n    this._forEachChild((control: AbstractControl, name: string) => {\n      if (value[name] === undefined) {\n        throw new Error(`Must supply a value for form control with name: '${name}'.`);\n      }\n    });\n  }\n}\n\n/**\n * Tracks the value and validity state of an array of `FormControl`,\n * `FormGroup` or `FormArray` instances.\n *\n * A `FormArray` aggregates the values of each child `FormControl` into an array.\n * It calculates its status by reducing the status values of its children. For example, if one of\n * the controls in a `FormArray` is invalid, the entire array becomes invalid.\n *\n * `FormArray` is one of the three fundamental building blocks used to define forms in Angular,\n * along with `FormControl` and `FormGroup`.\n *\n * @usageNotes\n *\n * ### Create an array of form controls\n *\n * ```\n * const arr = new FormArray([\n *   new FormControl('Nancy', Validators.minLength(2)),\n *   new FormControl('Drew'),\n * ]);\n *\n * console.log(arr.value);   // ['Nancy', 'Drew']\n * console.log(arr.status);  // 'VALID'\n * ```\n *\n * ### Create a form array with array-level validators\n *\n * You include array-level validators and async validators. These come in handy\n * when you want to perform validation that considers the value of more than one child\n * control.\n *\n * The two types of validators are passed in separately as the second and third arg\n * respectively, or together as part of an options object.\n *\n * ```\n * const arr = new FormArray([\n *   new FormControl('Nancy'),\n *   new FormControl('Drew')\n * ], {validators: myValidator, asyncValidators: myAsyncValidator});\n * ```\n *\n * ### Set the updateOn property for all controls in a form array\n *\n * The options object is used to set a default value for each child\n * control's `updateOn` property. If you set `updateOn` to `'blur'` at the\n * array level, all child controls default to 'blur', unless the child\n * has explicitly specified a different `updateOn` value.\n *\n * ```ts\n * const arr = new FormArray([\n *    new FormControl()\n * ], {updateOn: 'blur'});\n * ```\n *\n * ### Adding or removing controls from a form array\n *\n * To change the controls in the array, use the `push`, `insert`, `removeAt` or `clear` methods\n * in `FormArray` itself. These methods ensure the controls are properly tracked in the\n * form's hierarchy. Do not modify the array of `AbstractControl`s used to instantiate\n * the `FormArray` directly, as that result in strange and unexpected behavior such\n * as broken change detection.\n *\n * @publicApi\n */\nexport class FormArray extends AbstractControl {\n  /**\n   * Creates a new `FormArray` instance.\n   *\n   * @param controls An array of child controls. Each child control is given an index\n   * where it is registered.\n   *\n   * @param validatorOrOpts A synchronous validator function, or an array of\n   * such functions, or an `AbstractControlOptions` object that contains validation functions\n   * and a validation trigger.\n   *\n   * @param asyncValidator A single async validator or array of async validator functions\n   *\n   */\n  constructor(\n      public controls: AbstractControl[],\n      validatorOrOpts?: ValidatorFn|ValidatorFn[]|AbstractControlOptions|null,\n      asyncValidator?: AsyncValidatorFn|AsyncValidatorFn[]|null) {\n    super(pickValidators(validatorOrOpts), pickAsyncValidators(asyncValidator, validatorOrOpts));\n    this._initObservables();\n    this._setUpdateStrategy(validatorOrOpts);\n    this._setUpControls();\n    this.updateValueAndValidity({\n      onlySelf: true,\n      // If `asyncValidator` is present, it will trigger control status change from `PENDING` to\n      // `VALID` or `INVALID`.\n      // The status should be broadcasted via the `statusChanges` observable, so we set `emitEvent`\n      // to `true` to allow that during the control creation process.\n      emitEvent: !!this.asyncValidator\n    });\n  }\n\n  /**\n   * Get the `AbstractControl` at the given `index` in the array.\n   *\n   * @param index Index in the array to retrieve the control\n   */\n  at(index: number): AbstractControl {\n    return this.controls[index];\n  }\n\n  /**\n   * Insert a new `AbstractControl` at the end of the array.\n   *\n   * @param control Form control to be inserted\n   * @param options Specifies whether this FormArray instance should emit events after a new\n   *     control is added.\n   * * `emitEvent`: When true or not supplied (the default), both the `statusChanges` and\n   * `valueChanges` observables emit events with the latest status and value when the control is\n   * inserted. When false, no events are emitted.\n   */\n  push(control: AbstractControl, options: {emitEvent?: boolean} = {}): void {\n    this.controls.push(control);\n    this._registerControl(control);\n    this.updateValueAndValidity({emitEvent: options.emitEvent});\n    this._onCollectionChange();\n  }\n\n  /**\n   * Insert a new `AbstractControl` at the given `index` in the array.\n   *\n   * @param index Index in the array to insert the control\n   * @param control Form control to be inserted\n   * @param options Specifies whether this FormArray instance should emit events after a new\n   *     control is inserted.\n   * * `emitEvent`: When true or not supplied (the default), both the `statusChanges` and\n   * `valueChanges` observables emit events with the latest status and value when the control is\n   * inserted. When false, no events are emitted.\n   */\n  insert(index: number, control: AbstractControl, options: {emitEvent?: boolean} = {}): void {\n    this.controls.splice(index, 0, control);\n\n    this._registerControl(control);\n    this.updateValueAndValidity({emitEvent: options.emitEvent});\n  }\n\n  /**\n   * Remove the control at the given `index` in the array.\n   *\n   * @param index Index in the array to remove the control\n   * @param options Specifies whether this FormArray instance should emit events after a\n   *     control is removed.\n   * * `emitEvent`: When true or not supplied (the default), both the `statusChanges` and\n   * `valueChanges` observables emit events with the latest status and value when the control is\n   * removed. When false, no events are emitted.\n   */\n  removeAt(index: number, options: {emitEvent?: boolean} = {}): void {\n    if (this.controls[index]) this.controls[index]._registerOnCollectionChange(() => {});\n    this.controls.splice(index, 1);\n    this.updateValueAndValidity({emitEvent: options.emitEvent});\n  }\n\n  /**\n   * Replace an existing control.\n   *\n   * @param index Index in the array to replace the control\n   * @param control The `AbstractControl` control to replace the existing control\n   * @param options Specifies whether this FormArray instance should emit events after an\n   *     existing control is replaced with a new one.\n   * * `emitEvent`: When true or not supplied (the default), both the `statusChanges` and\n   * `valueChanges` observables emit events with the latest status and value when the control is\n   * replaced with a new one. When false, no events are emitted.\n   */\n  setControl(index: number, control: AbstractControl, options: {emitEvent?: boolean} = {}): void {\n    if (this.controls[index]) this.controls[index]._registerOnCollectionChange(() => {});\n    this.controls.splice(index, 1);\n\n    if (control) {\n      this.controls.splice(index, 0, control);\n      this._registerControl(control);\n    }\n\n    this.updateValueAndValidity({emitEvent: options.emitEvent});\n    this._onCollectionChange();\n  }\n\n  /**\n   * Length of the control array.\n   */\n  get length(): number {\n    return this.controls.length;\n  }\n\n  /**\n   * Sets the value of the `FormArray`. It accepts an array that matches\n   * the structure of the control.\n   *\n   * This method performs strict checks, and throws an error if you try\n   * to set the value of a control that doesn't exist or if you exclude the\n   * value of a control.\n   *\n   * @usageNotes\n   * ### Set the values for the controls in the form array\n   *\n   * ```\n   * const arr = new FormArray([\n   *   new FormControl(),\n   *   new FormControl()\n   * ]);\n   * console.log(arr.value);   // [null, null]\n   *\n   * arr.setValue(['Nancy', 'Drew']);\n   * console.log(arr.value);   // ['Nancy', 'Drew']\n   * ```\n   *\n   * @param value Array of values for the controls\n   * @param options Configure options that determine how the control propagates changes and\n   * emits events after the value changes\n   *\n   * * `onlySelf`: When true, each change only affects this control, and not its parent. Default\n   * is false.\n   * * `emitEvent`: When true or not supplied (the default), both the `statusChanges` and\n   * `valueChanges`\n   * observables emit events with the latest status and value when the control value is updated.\n   * When false, no events are emitted.\n   * The configuration options are passed to the {@link AbstractControl#updateValueAndValidity\n   * updateValueAndValidity} method.\n   */\n  override setValue(value: any[], options: {onlySelf?: boolean, emitEvent?: boolean} = {}): void {\n    this._checkAllValuesPresent(value);\n    value.forEach((newValue: any, index: number) => {\n      this._throwIfControlMissing(index);\n      this.at(index).setValue(newValue, {onlySelf: true, emitEvent: options.emitEvent});\n    });\n    this.updateValueAndValidity(options);\n  }\n\n  /**\n   * Patches the value of the `FormArray`. It accepts an array that matches the\n   * structure of the control, and does its best to match the values to the correct\n   * controls in the group.\n   *\n   * It accepts both super-sets and sub-sets of the array without throwing an error.\n   *\n   * @usageNotes\n   * ### Patch the values for controls in a form array\n   *\n   * ```\n   * const arr = new FormArray([\n   *    new FormControl(),\n   *    new FormControl()\n   * ]);\n   * console.log(arr.value);   // [null, null]\n   *\n   * arr.patchValue(['Nancy']);\n   * console.log(arr.value);   // ['Nancy', null]\n   * ```\n   *\n   * @param value Array of latest values for the controls\n   * @param options Configure options that determine how the control propagates changes and\n   * emits events after the value changes\n   *\n   * * `onlySelf`: When true, each change only affects this control, and not its parent. Default\n   * is false.\n   * * `emitEvent`: When true or not supplied (the default), both the `statusChanges` and\n   * `valueChanges` observables emit events with the latest status and value when the control value\n   * is updated. When false, no events are emitted. The configuration options are passed to\n   * the {@link AbstractControl#updateValueAndValidity updateValueAndValidity} method.\n   */\n  override patchValue(value: any[], options: {onlySelf?: boolean, emitEvent?: boolean} = {}): void {\n    // Even though the `value` argument type doesn't allow `null` and `undefined` values, the\n    // `patchValue` can be called recursively and inner data structures might have these values, so\n    // we just ignore such cases when a field containing FormArray instance receives `null` or\n    // `undefined` as a value.\n    if (value == null /* both `null` and `undefined` */) return;\n\n    value.forEach((newValue: any, index: number) => {\n      if (this.at(index)) {\n        this.at(index).patchValue(newValue, {onlySelf: true, emitEvent: options.emitEvent});\n      }\n    });\n    this.updateValueAndValidity(options);\n  }\n\n  /**\n   * Resets the `FormArray` and all descendants are marked `pristine` and `untouched`, and the\n   * value of all descendants to null or null maps.\n   *\n   * You reset to a specific form state by passing in an array of states\n   * that matches the structure of the control. The state is a standalone value\n   * or a form state object with both a value and a disabled status.\n   *\n   * @usageNotes\n   * ### Reset the values in a form array\n   *\n   * ```ts\n   * const arr = new FormArray([\n   *    new FormControl(),\n   *    new FormControl()\n   * ]);\n   * arr.reset(['name', 'last name']);\n   *\n   * console.log(arr.value);  // ['name', 'last name']\n   * ```\n   *\n   * ### Reset the values in a form array and the disabled status for the first control\n   *\n   * ```\n   * arr.reset([\n   *   {value: 'name', disabled: true},\n   *   'last'\n   * ]);\n   *\n   * console.log(arr.value);  // ['last']\n   * console.log(arr.at(0).status);  // 'DISABLED'\n   * ```\n   *\n   * @param value Array of values for the controls\n   * @param options Configure options that determine how the control propagates changes and\n   * emits events after the value changes\n   *\n   * * `onlySelf`: When true, each change only affects this control, and not its parent. Default\n   * is false.\n   * * `emitEvent`: When true or not supplied (the default), both the `statusChanges` and\n   * `valueChanges`\n   * observables emit events with the latest status and value when the control is reset.\n   * When false, no events are emitted.\n   * The configuration options are passed to the {@link AbstractControl#updateValueAndValidity\n   * updateValueAndValidity} method.\n   */\n  override reset(value: any = [], options: {onlySelf?: boolean, emitEvent?: boolean} = {}): void {\n    this._forEachChild((control: AbstractControl, index: number) => {\n      control.reset(value[index], {onlySelf: true, emitEvent: options.emitEvent});\n    });\n    this._updatePristine(options);\n    this._updateTouched(options);\n    this.updateValueAndValidity(options);\n  }\n\n  /**\n   * The aggregate value of the array, including any disabled controls.\n   *\n   * Reports all values regardless of disabled status.\n   * For enabled controls only, the `value` property is the best way to get the value of the array.\n   */\n  getRawValue(): any[] {\n    return this.controls.map((control: AbstractControl) => {\n      return control instanceof FormControl ? control.value : (<any>control).getRawValue();\n    });\n  }\n\n  /**\n   * Remove all controls in the `FormArray`.\n   *\n   * @param options Specifies whether this FormArray instance should emit events after all\n   *     controls are removed.\n   * * `emitEvent`: When true or not supplied (the default), both the `statusChanges` and\n   * `valueChanges` observables emit events with the latest status and value when all controls\n   * in this FormArray instance are removed. When false, no events are emitted.\n   *\n   * @usageNotes\n   * ### Remove all elements from a FormArray\n   *\n   * ```ts\n   * const arr = new FormArray([\n   *    new FormControl(),\n   *    new FormControl()\n   * ]);\n   * console.log(arr.length);  // 2\n   *\n   * arr.clear();\n   * console.log(arr.length);  // 0\n   * ```\n   *\n   * It's a simpler and more efficient alternative to removing all elements one by one:\n   *\n   * ```ts\n   * const arr = new FormArray([\n   *    new FormControl(),\n   *    new FormControl()\n   * ]);\n   *\n   * while (arr.length) {\n   *    arr.removeAt(0);\n   * }\n   * ```\n   */\n  clear(options: {emitEvent?: boolean} = {}): void {\n    if (this.controls.length < 1) return;\n    this._forEachChild((control: AbstractControl) => control._registerOnCollectionChange(() => {}));\n    this.controls.splice(0);\n    this.updateValueAndValidity({emitEvent: options.emitEvent});\n  }\n\n  /** @internal */\n  override _syncPendingControls(): boolean {\n    let subtreeUpdated = this.controls.reduce((updated: boolean, child: AbstractControl) => {\n      return child._syncPendingControls() ? true : updated;\n    }, false);\n    if (subtreeUpdated) this.updateValueAndValidity({onlySelf: true});\n    return subtreeUpdated;\n  }\n\n  /** @internal */\n  _throwIfControlMissing(index: number): void {\n    if (!this.controls.length) {\n      throw new Error(`\n        There are no form controls registered with this array yet. If you're using ngModel,\n        you may want to check next tick (e.g. use setTimeout).\n      `);\n    }\n    if (!this.at(index)) {\n      throw new Error(`Cannot find form control at index ${index}`);\n    }\n  }\n\n  /** @internal */\n  override _forEachChild(cb: Function): void {\n    this.controls.forEach((control: AbstractControl, index: number) => {\n      cb(control, index);\n    });\n  }\n\n  /** @internal */\n  override _updateValue(): void {\n    (this as {value: any}).value =\n        this.controls.filter((control) => control.enabled || this.disabled)\n            .map((control) => control.value);\n  }\n\n  /** @internal */\n  override _anyControls(condition: Function): boolean {\n    return this.controls.some((control: AbstractControl) => control.enabled && condition(control));\n  }\n\n  /** @internal */\n  _setUpControls(): void {\n    this._forEachChild((control: AbstractControl) => this._registerControl(control));\n  }\n\n  /** @internal */\n  _checkAllValuesPresent(value: any): void {\n    this._forEachChild((control: AbstractControl, i: number) => {\n      if (value[i] === undefined) {\n        throw new Error(`Must supply a value for form control at index: ${i}.`);\n      }\n    });\n  }\n\n  /** @internal */\n  override _allControlsDisabled(): boolean {\n    for (const control of this.controls) {\n      if (control.enabled) return false;\n    }\n    return this.controls.length > 0 || this.disabled;\n  }\n\n  private _registerControl(control: AbstractControl) {\n    control.setParent(this);\n    control._registerOnCollectionChange(this._onCollectionChange);\n  }\n}\n"]} |
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