source: trip-planner-front/node_modules/@angular/forms/esm2015/src/directives/ng_model.js

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1/**
2 * @license
3 * Copyright Google LLC All Rights Reserved.
4 *
5 * Use of this source code is governed by an MIT-style license that can be
6 * found in the LICENSE file at https://angular.io/license
7 */
8import { Directive, EventEmitter, forwardRef, Host, Inject, Input, Optional, Output, Self } from '@angular/core';
9import { FormControl } from '../model';
10import { NG_ASYNC_VALIDATORS, NG_VALIDATORS } from '../validators';
11import { AbstractFormGroupDirective } from './abstract_form_group_directive';
12import { ControlContainer } from './control_container';
13import { NG_VALUE_ACCESSOR } from './control_value_accessor';
14import { NgControl } from './ng_control';
15import { NgForm } from './ng_form';
16import { NgModelGroup } from './ng_model_group';
17import { controlPath, isPropertyUpdated, selectValueAccessor, setUpControl } from './shared';
18import { formGroupNameException, missingNameException, modelParentException } from './template_driven_errors';
19export const formControlBinding = {
20 provide: NgControl,
21 useExisting: forwardRef(() => NgModel)
22};
23const ɵ0 = () => Promise.resolve(null);
24/**
25 * `ngModel` forces an additional change detection run when its inputs change:
26 * E.g.:
27 * ```
28 * <div>{{myModel.valid}}</div>
29 * <input [(ngModel)]="myValue" #myModel="ngModel">
30 * ```
31 * I.e. `ngModel` can export itself on the element and then be used in the template.
32 * Normally, this would result in expressions before the `input` that use the exported directive
33 * to have an old value as they have been
34 * dirty checked before. As this is a very common case for `ngModel`, we added this second change
35 * detection run.
36 *
37 * Notes:
38 * - this is just one extra run no matter how many `ngModel`s have been changed.
39 * - this is a general problem when using `exportAs` for directives!
40 */
41const resolvedPromise = (ɵ0)();
42/**
43 * @description
44 * Creates a `FormControl` instance from a domain model and binds it
45 * to a form control element.
46 *
47 * The `FormControl` instance tracks the value, user interaction, and
48 * validation status of the control and keeps the view synced with the model. If used
49 * within a parent form, the directive also registers itself with the form as a child
50 * control.
51 *
52 * This directive is used by itself or as part of a larger form. Use the
53 * `ngModel` selector to activate it.
54 *
55 * It accepts a domain model as an optional `Input`. If you have a one-way binding
56 * to `ngModel` with `[]` syntax, changing the domain model's value in the component
57 * class sets the value in the view. If you have a two-way binding with `[()]` syntax
58 * (also known as 'banana-in-a-box syntax'), the value in the UI always syncs back to
59 * the domain model in your class.
60 *
61 * To inspect the properties of the associated `FormControl` (like the validity state),
62 * export the directive into a local template variable using `ngModel` as the key (ex:
63 * `#myVar="ngModel"`). You can then access the control using the directive's `control` property.
64 * However, the most commonly used properties (like `valid` and `dirty`) also exist on the control
65 * for direct access. See a full list of properties directly available in
66 * `AbstractControlDirective`.
67 *
68 * @see `RadioControlValueAccessor`
69 * @see `SelectControlValueAccessor`
70 *
71 * @usageNotes
72 *
73 * ### Using ngModel on a standalone control
74 *
75 * The following examples show a simple standalone control using `ngModel`:
76 *
77 * {@example forms/ts/simpleNgModel/simple_ng_model_example.ts region='Component'}
78 *
79 * When using the `ngModel` within `<form>` tags, you'll also need to supply a `name` attribute
80 * so that the control can be registered with the parent form under that name.
81 *
82 * In the context of a parent form, it's often unnecessary to include one-way or two-way binding,
83 * as the parent form syncs the value for you. You access its properties by exporting it into a
84 * local template variable using `ngForm` such as (`#f="ngForm"`). Use the variable where
85 * needed on form submission.
86 *
87 * If you do need to populate initial values into your form, using a one-way binding for
88 * `ngModel` tends to be sufficient as long as you use the exported form's value rather
89 * than the domain model's value on submit.
90 *
91 * ### Using ngModel within a form
92 *
93 * The following example shows controls using `ngModel` within a form:
94 *
95 * {@example forms/ts/simpleForm/simple_form_example.ts region='Component'}
96 *
97 * ### Using a standalone ngModel within a group
98 *
99 * The following example shows you how to use a standalone ngModel control
100 * within a form. This controls the display of the form, but doesn't contain form data.
101 *
102 * ```html
103 * <form>
104 * <input name="login" ngModel placeholder="Login">
105 * <input type="checkbox" ngModel [ngModelOptions]="{standalone: true}"> Show more options?
106 * </form>
107 * <!-- form value: {login: ''} -->
108 * ```
109 *
110 * ### Setting the ngModel `name` attribute through options
111 *
112 * The following example shows you an alternate way to set the name attribute. Here,
113 * an attribute identified as name is used within a custom form control component. To still be able
114 * to specify the NgModel's name, you must specify it using the `ngModelOptions` input instead.
115 *
116 * ```html
117 * <form>
118 * <my-custom-form-control name="Nancy" ngModel [ngModelOptions]="{name: 'user'}">
119 * </my-custom-form-control>
120 * </form>
121 * <!-- form value: {user: ''} -->
122 * ```
123 *
124 * @ngModule FormsModule
125 * @publicApi
126 */
127export class NgModel extends NgControl {
128 constructor(parent, validators, asyncValidators, valueAccessors) {
129 super();
130 this.control = new FormControl();
131 /** @internal */
132 this._registered = false;
133 /**
134 * @description
135 * Event emitter for producing the `ngModelChange` event after
136 * the view model updates.
137 */
138 this.update = new EventEmitter();
139 this._parent = parent;
140 this._setValidators(validators);
141 this._setAsyncValidators(asyncValidators);
142 this.valueAccessor = selectValueAccessor(this, valueAccessors);
143 }
144 /** @nodoc */
145 ngOnChanges(changes) {
146 this._checkForErrors();
147 if (!this._registered)
148 this._setUpControl();
149 if ('isDisabled' in changes) {
150 this._updateDisabled(changes);
151 }
152 if (isPropertyUpdated(changes, this.viewModel)) {
153 this._updateValue(this.model);
154 this.viewModel = this.model;
155 }
156 }
157 /** @nodoc */
158 ngOnDestroy() {
159 this.formDirective && this.formDirective.removeControl(this);
160 }
161 /**
162 * @description
163 * Returns an array that represents the path from the top-level form to this control.
164 * Each index is the string name of the control on that level.
165 */
166 get path() {
167 return this._parent ? controlPath(this.name, this._parent) : [this.name];
168 }
169 /**
170 * @description
171 * The top-level directive for this control if present, otherwise null.
172 */
173 get formDirective() {
174 return this._parent ? this._parent.formDirective : null;
175 }
176 /**
177 * @description
178 * Sets the new value for the view model and emits an `ngModelChange` event.
179 *
180 * @param newValue The new value emitted by `ngModelChange`.
181 */
182 viewToModelUpdate(newValue) {
183 this.viewModel = newValue;
184 this.update.emit(newValue);
185 }
186 _setUpControl() {
187 this._setUpdateStrategy();
188 this._isStandalone() ? this._setUpStandalone() : this.formDirective.addControl(this);
189 this._registered = true;
190 }
191 _setUpdateStrategy() {
192 if (this.options && this.options.updateOn != null) {
193 this.control._updateOn = this.options.updateOn;
194 }
195 }
196 _isStandalone() {
197 return !this._parent || !!(this.options && this.options.standalone);
198 }
199 _setUpStandalone() {
200 setUpControl(this.control, this);
201 this.control.updateValueAndValidity({ emitEvent: false });
202 }
203 _checkForErrors() {
204 if (!this._isStandalone()) {
205 this._checkParentType();
206 }
207 this._checkName();
208 }
209 _checkParentType() {
210 if (typeof ngDevMode === 'undefined' || ngDevMode) {
211 if (!(this._parent instanceof NgModelGroup) &&
212 this._parent instanceof AbstractFormGroupDirective) {
213 throw formGroupNameException();
214 }
215 else if (!(this._parent instanceof NgModelGroup) && !(this._parent instanceof NgForm)) {
216 throw modelParentException();
217 }
218 }
219 }
220 _checkName() {
221 if (this.options && this.options.name)
222 this.name = this.options.name;
223 if (!this._isStandalone() && !this.name && (typeof ngDevMode === 'undefined' || ngDevMode)) {
224 throw missingNameException();
225 }
226 }
227 _updateValue(value) {
228 resolvedPromise.then(() => {
229 this.control.setValue(value, { emitViewToModelChange: false });
230 });
231 }
232 _updateDisabled(changes) {
233 const disabledValue = changes['isDisabled'].currentValue;
234 const isDisabled = disabledValue === '' || (disabledValue && disabledValue !== 'false');
235 resolvedPromise.then(() => {
236 if (isDisabled && !this.control.disabled) {
237 this.control.disable();
238 }
239 else if (!isDisabled && this.control.disabled) {
240 this.control.enable();
241 }
242 });
243 }
244}
245NgModel.decorators = [
246 { type: Directive, args: [{
247 selector: '[ngModel]:not([formControlName]):not([formControl])',
248 providers: [formControlBinding],
249 exportAs: 'ngModel'
250 },] }
251];
252NgModel.ctorParameters = () => [
253 { type: ControlContainer, decorators: [{ type: Optional }, { type: Host }] },
254 { type: Array, decorators: [{ type: Optional }, { type: Self }, { type: Inject, args: [NG_VALIDATORS,] }] },
255 { type: Array, decorators: [{ type: Optional }, { type: Self }, { type: Inject, args: [NG_ASYNC_VALIDATORS,] }] },
256 { type: Array, decorators: [{ type: Optional }, { type: Self }, { type: Inject, args: [NG_VALUE_ACCESSOR,] }] }
257];
258NgModel.propDecorators = {
259 name: [{ type: Input }],
260 isDisabled: [{ type: Input, args: ['disabled',] }],
261 model: [{ type: Input, args: ['ngModel',] }],
262 options: [{ type: Input, args: ['ngModelOptions',] }],
263 update: [{ type: Output, args: ['ngModelChange',] }]
264};
265export { ɵ0 };
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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 {Directive, EventEmitter, forwardRef, Host, Inject, Input, OnChanges, OnDestroy, Optional, Output, Self, SimpleChanges} from '@angular/core';\n\nimport {FormControl, FormHooks} from '../model';\nimport {NG_ASYNC_VALIDATORS, NG_VALIDATORS} from '../validators';\n\nimport {AbstractFormGroupDirective} from './abstract_form_group_directive';\nimport {ControlContainer} from './control_container';\nimport {ControlValueAccessor, NG_VALUE_ACCESSOR} from './control_value_accessor';\nimport {NgControl} from './ng_control';\nimport {NgForm} from './ng_form';\nimport {NgModelGroup} from './ng_model_group';\nimport {controlPath, isPropertyUpdated, selectValueAccessor, setUpControl} from './shared';\nimport {formGroupNameException, missingNameException, modelParentException} from './template_driven_errors';\nimport {AsyncValidator, AsyncValidatorFn, Validator, ValidatorFn} from './validators';\n\nexport const formControlBinding: any = {\n  provide: NgControl,\n  useExisting: forwardRef(() => NgModel)\n};\n\n/**\n * `ngModel` forces an additional change detection run when its inputs change:\n * E.g.:\n * ```\n * <div>{{myModel.valid}}</div>\n * <input [(ngModel)]=\"myValue\" #myModel=\"ngModel\">\n * ```\n * I.e. `ngModel` can export itself on the element and then be used in the template.\n * Normally, this would result in expressions before the `input` that use the exported directive\n * to have an old value as they have been\n * dirty checked before. As this is a very common case for `ngModel`, we added this second change\n * detection run.\n *\n * Notes:\n * - this is just one extra run no matter how many `ngModel`s have been changed.\n * - this is a general problem when using `exportAs` for directives!\n */\nconst resolvedPromise = (() => Promise.resolve(null))();\n\n/**\n * @description\n * Creates a `FormControl` instance from a domain model and binds it\n * to a form control element.\n *\n * The `FormControl` instance tracks the value, user interaction, and\n * validation status of the control and keeps the view synced with the model. If used\n * within a parent form, the directive also registers itself with the form as a child\n * control.\n *\n * This directive is used by itself or as part of a larger form. Use the\n * `ngModel` selector to activate it.\n *\n * It accepts a domain model as an optional `Input`. If you have a one-way binding\n * to `ngModel` with `[]` syntax, changing the domain model's value in the component\n * class sets the value in the view. If you have a two-way binding with `[()]` syntax\n * (also known as 'banana-in-a-box syntax'), the value in the UI always syncs back to\n * the domain model in your class.\n *\n * To inspect the properties of the associated `FormControl` (like the validity state),\n * export the directive into a local template variable using `ngModel` as the key (ex:\n * `#myVar=\"ngModel\"`). You can then access the control using the directive's `control` property.\n * However, the most commonly used properties (like `valid` and `dirty`) also exist on the control\n * for direct access. See a full list of properties directly available in\n * `AbstractControlDirective`.\n *\n * @see `RadioControlValueAccessor`\n * @see `SelectControlValueAccessor`\n *\n * @usageNotes\n *\n * ### Using ngModel on a standalone control\n *\n * The following examples show a simple standalone control using `ngModel`:\n *\n * {@example forms/ts/simpleNgModel/simple_ng_model_example.ts region='Component'}\n *\n * When using the `ngModel` within `<form>` tags, you'll also need to supply a `name` attribute\n * so that the control can be registered with the parent form under that name.\n *\n * In the context of a parent form, it's often unnecessary to include one-way or two-way binding,\n * as the parent form syncs the value for you. You access its properties by exporting it into a\n * local template variable using `ngForm` such as (`#f=\"ngForm\"`). Use the variable where\n * needed on form submission.\n *\n * If you do need to populate initial values into your form, using a one-way binding for\n * `ngModel` tends to be sufficient as long as you use the exported form's value rather\n * than the domain model's value on submit.\n *\n * ### Using ngModel within a form\n *\n * The following example shows controls using `ngModel` within a form:\n *\n * {@example forms/ts/simpleForm/simple_form_example.ts region='Component'}\n *\n * ### Using a standalone ngModel within a group\n *\n * The following example shows you how to use a standalone ngModel control\n * within a form. This controls the display of the form, but doesn't contain form data.\n *\n * ```html\n * <form>\n *   <input name=\"login\" ngModel placeholder=\"Login\">\n *   <input type=\"checkbox\" ngModel [ngModelOptions]=\"{standalone: true}\"> Show more options?\n * </form>\n * <!-- form value: {login: ''} -->\n * ```\n *\n * ### Setting the ngModel `name` attribute through options\n *\n * The following example shows you an alternate way to set the name attribute. Here,\n * an attribute identified as name is used within a custom form control component. To still be able\n * to specify the NgModel's name, you must specify it using the `ngModelOptions` input instead.\n *\n * ```html\n * <form>\n *   <my-custom-form-control name=\"Nancy\" ngModel [ngModelOptions]=\"{name: 'user'}\">\n *   </my-custom-form-control>\n * </form>\n * <!-- form value: {user: ''} -->\n * ```\n *\n * @ngModule FormsModule\n * @publicApi\n */\n@Directive({\n  selector: '[ngModel]:not([formControlName]):not([formControl])',\n  providers: [formControlBinding],\n  exportAs: 'ngModel'\n})\nexport class NgModel extends NgControl implements OnChanges, OnDestroy {\n  public override readonly control: FormControl = new FormControl();\n\n  // At runtime we coerce arbitrary values assigned to the \"disabled\" input to a \"boolean\".\n  // This is not reflected in the type of the property because outside of templates, consumers\n  // should only deal with booleans. In templates, a string is allowed for convenience and to\n  // match the native \"disabled attribute\" semantics which can be observed on input elements.\n  // This static member tells the compiler that values of type \"string\" can also be assigned\n  // to the input in a template.\n  /** @nodoc */\n  static ngAcceptInputType_isDisabled: boolean|string;\n\n  /** @internal */\n  _registered = false;\n\n  /**\n   * Internal reference to the view model value.\n   * @nodoc\n   */\n  viewModel: any;\n\n  /**\n   * @description\n   * Tracks the name bound to the directive. If a parent form exists, it\n   * uses this name as a key to retrieve this control's value.\n   */\n  // TODO(issue/24571): remove '!'.\n  @Input() override name!: string;\n\n  /**\n   * @description\n   * Tracks whether the control is disabled.\n   */\n  // TODO(issue/24571): remove '!'.\n  @Input('disabled') isDisabled!: boolean;\n\n  /**\n   * @description\n   * Tracks the value bound to this directive.\n   */\n  @Input('ngModel') model: any;\n\n  /**\n   * @description\n   * Tracks the configuration options for this `ngModel` instance.\n   *\n   * **name**: An alternative to setting the name attribute on the form control element. See\n   * the [example](api/forms/NgModel#using-ngmodel-on-a-standalone-control) for using `NgModel`\n   * as a standalone control.\n   *\n   * **standalone**: When set to true, the `ngModel` will not register itself with its parent form,\n   * and acts as if it's not in the form. Defaults to false. If no parent form exists, this option\n   * has no effect.\n   *\n   * **updateOn**: Defines the event upon which the form control value and validity update.\n   * Defaults to 'change'. Possible values: `'change'` | `'blur'` | `'submit'`.\n   *\n   */\n  // TODO(issue/24571): remove '!'.\n  @Input('ngModelOptions') options!: {name?: string, standalone?: boolean, updateOn?: FormHooks};\n\n  /**\n   * @description\n   * Event emitter for producing the `ngModelChange` event after\n   * the view model updates.\n   */\n  @Output('ngModelChange') update = new EventEmitter();\n\n  constructor(\n      @Optional() @Host() parent: ControlContainer,\n      @Optional() @Self() @Inject(NG_VALIDATORS) validators: (Validator|ValidatorFn)[],\n      @Optional() @Self() @Inject(NG_ASYNC_VALIDATORS) asyncValidators:\n          (AsyncValidator|AsyncValidatorFn)[],\n      @Optional() @Self() @Inject(NG_VALUE_ACCESSOR) valueAccessors: ControlValueAccessor[]) {\n    super();\n    this._parent = parent;\n    this._setValidators(validators);\n    this._setAsyncValidators(asyncValidators);\n    this.valueAccessor = selectValueAccessor(this, valueAccessors);\n  }\n\n  /** @nodoc */\n  ngOnChanges(changes: SimpleChanges) {\n    this._checkForErrors();\n    if (!this._registered) this._setUpControl();\n    if ('isDisabled' in changes) {\n      this._updateDisabled(changes);\n    }\n\n    if (isPropertyUpdated(changes, this.viewModel)) {\n      this._updateValue(this.model);\n      this.viewModel = this.model;\n    }\n  }\n\n  /** @nodoc */\n  ngOnDestroy(): void {\n    this.formDirective && this.formDirective.removeControl(this);\n  }\n\n  /**\n   * @description\n   * Returns an array that represents the path from the top-level form to this control.\n   * Each index is the string name of the control on that level.\n   */\n  override get path(): string[] {\n    return this._parent ? controlPath(this.name, this._parent) : [this.name];\n  }\n\n  /**\n   * @description\n   * The top-level directive for this control if present, otherwise null.\n   */\n  get formDirective(): any {\n    return this._parent ? this._parent.formDirective : null;\n  }\n\n  /**\n   * @description\n   * Sets the new value for the view model and emits an `ngModelChange` event.\n   *\n   * @param newValue The new value emitted by `ngModelChange`.\n   */\n  override viewToModelUpdate(newValue: any): void {\n    this.viewModel = newValue;\n    this.update.emit(newValue);\n  }\n\n  private _setUpControl(): void {\n    this._setUpdateStrategy();\n    this._isStandalone() ? this._setUpStandalone() : this.formDirective.addControl(this);\n    this._registered = true;\n  }\n\n  private _setUpdateStrategy(): void {\n    if (this.options && this.options.updateOn != null) {\n      this.control._updateOn = this.options.updateOn;\n    }\n  }\n\n  private _isStandalone(): boolean {\n    return !this._parent || !!(this.options && this.options.standalone);\n  }\n\n  private _setUpStandalone(): void {\n    setUpControl(this.control, this);\n    this.control.updateValueAndValidity({emitEvent: false});\n  }\n\n  private _checkForErrors(): void {\n    if (!this._isStandalone()) {\n      this._checkParentType();\n    }\n    this._checkName();\n  }\n\n  private _checkParentType(): void {\n    if (typeof ngDevMode === 'undefined' || ngDevMode) {\n      if (!(this._parent instanceof NgModelGroup) &&\n          this._parent instanceof AbstractFormGroupDirective) {\n        throw formGroupNameException();\n      } else if (!(this._parent instanceof NgModelGroup) && !(this._parent instanceof NgForm)) {\n        throw modelParentException();\n      }\n    }\n  }\n\n  private _checkName(): void {\n    if (this.options && this.options.name) this.name = this.options.name;\n\n    if (!this._isStandalone() && !this.name && (typeof ngDevMode === 'undefined' || ngDevMode)) {\n      throw missingNameException();\n    }\n  }\n\n  private _updateValue(value: any): void {\n    resolvedPromise.then(() => {\n      this.control.setValue(value, {emitViewToModelChange: false});\n    });\n  }\n\n  private _updateDisabled(changes: SimpleChanges) {\n    const disabledValue = changes['isDisabled'].currentValue;\n\n    const isDisabled = disabledValue === '' || (disabledValue && disabledValue !== 'false');\n\n    resolvedPromise.then(() => {\n      if (isDisabled && !this.control.disabled) {\n        this.control.disable();\n      } else if (!isDisabled && this.control.disabled) {\n        this.control.enable();\n      }\n    });\n  }\n}\n"]}
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