/** * @license * Copyright Google LLC All Rights Reserved. * * Use of this source code is governed by an MIT-style license that can be * found in the LICENSE file at https://angular.io/license */ import { DOCUMENT } from '@angular/common'; import { Inject, Injectable } from '@angular/core'; import { addAriaReferencedId, getAriaReferenceIds, removeAriaReferencedId } from './aria-reference'; import * as i0 from "@angular/core"; import * as i1 from "@angular/common"; /** ID used for the body container where all messages are appended. */ export const MESSAGES_CONTAINER_ID = 'cdk-describedby-message-container'; /** ID prefix used for each created message element. */ export const CDK_DESCRIBEDBY_ID_PREFIX = 'cdk-describedby-message'; /** Attribute given to each host element that is described by a message element. */ export const CDK_DESCRIBEDBY_HOST_ATTRIBUTE = 'cdk-describedby-host'; /** Global incremental identifier for each registered message element. */ let nextId = 0; /** Global map of all registered message elements that have been placed into the document. */ const messageRegistry = new Map(); /** Container for all registered messages. */ let messagesContainer = null; /** * Utility that creates visually hidden elements with a message content. Useful for elements that * want to use aria-describedby to further describe themselves without adding additional visual * content. */ export class AriaDescriber { constructor(_document) { this._document = _document; } describe(hostElement, message, role) { if (!this._canBeDescribed(hostElement, message)) { return; } const key = getKey(message, role); if (typeof message !== 'string') { // We need to ensure that the element has an ID. setMessageId(message); messageRegistry.set(key, { messageElement: message, referenceCount: 0 }); } else if (!messageRegistry.has(key)) { this._createMessageElement(message, role); } if (!this._isElementDescribedByMessage(hostElement, key)) { this._addMessageReference(hostElement, key); } } removeDescription(hostElement, message, role) { if (!message || !this._isElementNode(hostElement)) { return; } const key = getKey(message, role); if (this._isElementDescribedByMessage(hostElement, key)) { this._removeMessageReference(hostElement, key); } // If the message is a string, it means that it's one that we created for the // consumer so we can remove it safely, otherwise we should leave it in place. if (typeof message === 'string') { const registeredMessage = messageRegistry.get(key); if (registeredMessage && registeredMessage.referenceCount === 0) { this._deleteMessageElement(key); } } if (messagesContainer && messagesContainer.childNodes.length === 0) { this._deleteMessagesContainer(); } } /** Unregisters all created message elements and removes the message container. */ ngOnDestroy() { const describedElements = this._document.querySelectorAll(`[${CDK_DESCRIBEDBY_HOST_ATTRIBUTE}]`); for (let i = 0; i < describedElements.length; i++) { this._removeCdkDescribedByReferenceIds(describedElements[i]); describedElements[i].removeAttribute(CDK_DESCRIBEDBY_HOST_ATTRIBUTE); } if (messagesContainer) { this._deleteMessagesContainer(); } messageRegistry.clear(); } /** * Creates a new element in the visually hidden message container element with the message * as its content and adds it to the message registry. */ _createMessageElement(message, role) { const messageElement = this._document.createElement('div'); setMessageId(messageElement); messageElement.textContent = message; if (role) { messageElement.setAttribute('role', role); } this._createMessagesContainer(); messagesContainer.appendChild(messageElement); messageRegistry.set(getKey(message, role), { messageElement, referenceCount: 0 }); } /** Deletes the message element from the global messages container. */ _deleteMessageElement(key) { const registeredMessage = messageRegistry.get(key); const messageElement = registeredMessage && registeredMessage.messageElement; if (messagesContainer && messageElement) { messagesContainer.removeChild(messageElement); } messageRegistry.delete(key); } /** Creates the global container for all aria-describedby messages. */ _createMessagesContainer() { if (!messagesContainer) { const preExistingContainer = this._document.getElementById(MESSAGES_CONTAINER_ID); // When going from the server to the client, we may end up in a situation where there's // already a container on the page, but we don't have a reference to it. Clear the // old container so we don't get duplicates. Doing this, instead of emptying the previous // container, should be slightly faster. if (preExistingContainer && preExistingContainer.parentNode) { preExistingContainer.parentNode.removeChild(preExistingContainer); } messagesContainer = this._document.createElement('div'); messagesContainer.id = MESSAGES_CONTAINER_ID; // We add `visibility: hidden` in order to prevent text in this container from // being searchable by the browser's Ctrl + F functionality. // Screen-readers will still read the description for elements with aria-describedby even // when the description element is not visible. messagesContainer.style.visibility = 'hidden'; // Even though we use `visibility: hidden`, we still apply `cdk-visually-hidden` so that // the description element doesn't impact page layout. messagesContainer.classList.add('cdk-visually-hidden'); this._document.body.appendChild(messagesContainer); } } /** Deletes the global messages container. */ _deleteMessagesContainer() { if (messagesContainer && messagesContainer.parentNode) { messagesContainer.parentNode.removeChild(messagesContainer); messagesContainer = null; } } /** Removes all cdk-describedby messages that are hosted through the element. */ _removeCdkDescribedByReferenceIds(element) { // Remove all aria-describedby reference IDs that are prefixed by CDK_DESCRIBEDBY_ID_PREFIX const originalReferenceIds = getAriaReferenceIds(element, 'aria-describedby') .filter(id => id.indexOf(CDK_DESCRIBEDBY_ID_PREFIX) != 0); element.setAttribute('aria-describedby', originalReferenceIds.join(' ')); } /** * Adds a message reference to the element using aria-describedby and increments the registered * message's reference count. */ _addMessageReference(element, key) { const registeredMessage = messageRegistry.get(key); // Add the aria-describedby reference and set the // describedby_host attribute to mark the element. addAriaReferencedId(element, 'aria-describedby', registeredMessage.messageElement.id); element.setAttribute(CDK_DESCRIBEDBY_HOST_ATTRIBUTE, ''); registeredMessage.referenceCount++; } /** * Removes a message reference from the element using aria-describedby * and decrements the registered message's reference count. */ _removeMessageReference(element, key) { const registeredMessage = messageRegistry.get(key); registeredMessage.referenceCount--; removeAriaReferencedId(element, 'aria-describedby', registeredMessage.messageElement.id); element.removeAttribute(CDK_DESCRIBEDBY_HOST_ATTRIBUTE); } /** Returns true if the element has been described by the provided message ID. */ _isElementDescribedByMessage(element, key) { const referenceIds = getAriaReferenceIds(element, 'aria-describedby'); const registeredMessage = messageRegistry.get(key); const messageId = registeredMessage && registeredMessage.messageElement.id; return !!messageId && referenceIds.indexOf(messageId) != -1; } /** Determines whether a message can be described on a particular element. */ _canBeDescribed(element, message) { if (!this._isElementNode(element)) { return false; } if (message && typeof message === 'object') { // We'd have to make some assumptions about the description element's text, if the consumer // passed in an element. Assume that if an element is passed in, the consumer has verified // that it can be used as a description. return true; } const trimmedMessage = message == null ? '' : `${message}`.trim(); const ariaLabel = element.getAttribute('aria-label'); // We shouldn't set descriptions if they're exactly the same as the `aria-label` of the // element, because screen readers will end up reading out the same text twice in a row. return trimmedMessage ? (!ariaLabel || ariaLabel.trim() !== trimmedMessage) : false; } /** Checks whether a node is an Element node. */ _isElementNode(element) { return element.nodeType === this._document.ELEMENT_NODE; } } AriaDescriber.ɵprov = i0.ɵɵdefineInjectable({ factory: function AriaDescriber_Factory() { return new AriaDescriber(i0.ɵɵinject(i1.DOCUMENT)); }, token: AriaDescriber, providedIn: "root" }); AriaDescriber.decorators = [ { type: Injectable, args: [{ providedIn: 'root' },] } ]; AriaDescriber.ctorParameters = () => [ { type: undefined, decorators: [{ type: Inject, args: [DOCUMENT,] }] } ]; /** Gets a key that can be used to look messages up in the registry. */ function getKey(message, role) { return typeof message === 'string' ? `${role || ''}/${message}` : message; } /** Assigns a unique ID to an element, if it doesn't have one already. */ function setMessageId(element) { if (!element.id) { element.id = `${CDK_DESCRIBEDBY_ID_PREFIX}-${nextId++}`; } } //# 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'cdk-describedby-message-container';\n\n/** ID prefix used for each created message element. */\nexport const CDK_DESCRIBEDBY_ID_PREFIX = 'cdk-describedby-message';\n\n/** Attribute given to each host element that is described by a message element. */\nexport const CDK_DESCRIBEDBY_HOST_ATTRIBUTE = 'cdk-describedby-host';\n\n/** Global incremental identifier for each registered message element. */\nlet nextId = 0;\n\n/** Global map of all registered message elements that have been placed into the document. */\nconst messageRegistry = new Map<string|Element, RegisteredMessage>();\n\n/** Container for all registered messages. */\nlet messagesContainer: HTMLElement | null = null;\n\n/**\n * Utility that creates visually hidden elements with a message content. Useful for elements that\n * want to use aria-describedby to further describe themselves without adding additional visual\n * content.\n */\n@Injectable({providedIn: 'root'})\nexport class AriaDescriber implements OnDestroy {\n  private _document: Document;\n\n  constructor(\n    @Inject(DOCUMENT) _document: any) {\n    this._document = _document;\n  }\n\n  /**\n   * Adds to the host element an aria-describedby reference to a hidden element that contains\n   * the message. If the same message has already been registered, then it will reuse the created\n   * message element.\n   */\n  describe(hostElement: Element, message: string, role?: string): void;\n\n  /**\n   * Adds to the host element an aria-describedby reference to an already-existing message element.\n   */\n  describe(hostElement: Element, message: HTMLElement): void;\n\n  describe(hostElement: Element, message: string|HTMLElement, role?: string): void {\n    if (!this._canBeDescribed(hostElement, message)) {\n      return;\n    }\n\n    const key = getKey(message, role);\n\n    if (typeof message !== 'string') {\n      // We need to ensure that the element has an ID.\n      setMessageId(message);\n      messageRegistry.set(key, {messageElement: message, referenceCount: 0});\n    } else if (!messageRegistry.has(key)) {\n      this._createMessageElement(message, role);\n    }\n\n    if (!this._isElementDescribedByMessage(hostElement, key)) {\n      this._addMessageReference(hostElement, key);\n    }\n  }\n\n  /** Removes the host element's aria-describedby reference to the message. */\n  removeDescription(hostElement: Element, message: string, role?: string): void;\n\n  /** Removes the host element's aria-describedby reference to the message element. */\n  removeDescription(hostElement: Element, message: HTMLElement): void;\n\n  removeDescription(hostElement: Element, message: string|HTMLElement, role?: string): void {\n    if (!message || !this._isElementNode(hostElement)) {\n      return;\n    }\n\n    const key = getKey(message, role);\n\n    if (this._isElementDescribedByMessage(hostElement, key)) {\n      this._removeMessageReference(hostElement, key);\n    }\n\n    // If the message is a string, it means that it's one that we created for the\n    // consumer so we can remove it safely, otherwise we should leave it in place.\n    if (typeof message === 'string') {\n      const registeredMessage = messageRegistry.get(key);\n      if (registeredMessage && registeredMessage.referenceCount === 0) {\n        this._deleteMessageElement(key);\n      }\n    }\n\n    if (messagesContainer && messagesContainer.childNodes.length === 0) {\n      this._deleteMessagesContainer();\n    }\n  }\n\n  /** Unregisters all created message elements and removes the message container. */\n  ngOnDestroy() {\n    const describedElements =\n        this._document.querySelectorAll(`[${CDK_DESCRIBEDBY_HOST_ATTRIBUTE}]`);\n\n    for (let i = 0; i < describedElements.length; i++) {\n      this._removeCdkDescribedByReferenceIds(describedElements[i]);\n      describedElements[i].removeAttribute(CDK_DESCRIBEDBY_HOST_ATTRIBUTE);\n    }\n\n    if (messagesContainer) {\n      this._deleteMessagesContainer();\n    }\n\n    messageRegistry.clear();\n  }\n\n  /**\n   * Creates a new element in the visually hidden message container element with the message\n   * as its content and adds it to the message registry.\n   */\n  private _createMessageElement(message: string, role?: string) {\n    const messageElement = this._document.createElement('div');\n    setMessageId(messageElement);\n    messageElement.textContent = message;\n\n    if (role) {\n      messageElement.setAttribute('role', role);\n    }\n\n    this._createMessagesContainer();\n    messagesContainer!.appendChild(messageElement);\n    messageRegistry.set(getKey(message, role), {messageElement, referenceCount: 0});\n  }\n\n  /** Deletes the message element from the global messages container. */\n  private _deleteMessageElement(key: string|Element) {\n    const registeredMessage = messageRegistry.get(key);\n    const messageElement = registeredMessage && registeredMessage.messageElement;\n    if (messagesContainer && messageElement) {\n      messagesContainer.removeChild(messageElement);\n    }\n    messageRegistry.delete(key);\n  }\n\n  /** Creates the global container for all aria-describedby messages. */\n  private _createMessagesContainer() {\n    if (!messagesContainer) {\n      const preExistingContainer = this._document.getElementById(MESSAGES_CONTAINER_ID);\n\n      // When going from the server to the client, we may end up in a situation where there's\n      // already a container on the page, but we don't have a reference to it. Clear the\n      // old container so we don't get duplicates. Doing this, instead of emptying the previous\n      // container, should be slightly faster.\n      if (preExistingContainer && preExistingContainer.parentNode) {\n        preExistingContainer.parentNode.removeChild(preExistingContainer);\n      }\n\n      messagesContainer = this._document.createElement('div');\n      messagesContainer.id = MESSAGES_CONTAINER_ID;\n      // We add `visibility: hidden` in order to prevent text in this container from\n      // being searchable by the browser's Ctrl + F functionality.\n      // Screen-readers will still read the description for elements with aria-describedby even\n      // when the description element is not visible.\n      messagesContainer.style.visibility = 'hidden';\n      // Even though we use `visibility: hidden`, we still apply `cdk-visually-hidden` so that\n      // the description element doesn't impact page layout.\n      messagesContainer.classList.add('cdk-visually-hidden');\n\n      this._document.body.appendChild(messagesContainer);\n    }\n  }\n\n  /** Deletes the global messages container. */\n  private _deleteMessagesContainer() {\n    if (messagesContainer && messagesContainer.parentNode) {\n      messagesContainer.parentNode.removeChild(messagesContainer);\n      messagesContainer = null;\n    }\n  }\n\n  /** Removes all cdk-describedby messages that are hosted through the element. */\n  private _removeCdkDescribedByReferenceIds(element: Element) {\n    // Remove all aria-describedby reference IDs that are prefixed by CDK_DESCRIBEDBY_ID_PREFIX\n    const originalReferenceIds = getAriaReferenceIds(element, 'aria-describedby')\n        .filter(id => id.indexOf(CDK_DESCRIBEDBY_ID_PREFIX) != 0);\n    element.setAttribute('aria-describedby', originalReferenceIds.join(' '));\n  }\n\n  /**\n   * Adds a message reference to the element using aria-describedby and increments the registered\n   * message's reference count.\n   */\n  private _addMessageReference(element: Element, key: string|Element) {\n    const registeredMessage = messageRegistry.get(key)!;\n\n    // Add the aria-describedby reference and set the\n    // describedby_host attribute to mark the element.\n    addAriaReferencedId(element, 'aria-describedby', registeredMessage.messageElement.id);\n    element.setAttribute(CDK_DESCRIBEDBY_HOST_ATTRIBUTE, '');\n    registeredMessage.referenceCount++;\n  }\n\n  /**\n   * Removes a message reference from the element using aria-describedby\n   * and decrements the registered message's reference count.\n   */\n  private _removeMessageReference(element: Element, key: string|Element) {\n    const registeredMessage = messageRegistry.get(key)!;\n    registeredMessage.referenceCount--;\n\n    removeAriaReferencedId(element, 'aria-describedby', registeredMessage.messageElement.id);\n    element.removeAttribute(CDK_DESCRIBEDBY_HOST_ATTRIBUTE);\n  }\n\n  /** Returns true if the element has been described by the provided message ID. */\n  private _isElementDescribedByMessage(element: Element, key: string|Element): boolean {\n    const referenceIds = getAriaReferenceIds(element, 'aria-describedby');\n    const registeredMessage = messageRegistry.get(key);\n    const messageId = registeredMessage && registeredMessage.messageElement.id;\n\n    return !!messageId && referenceIds.indexOf(messageId) != -1;\n  }\n\n  /** Determines whether a message can be described on a particular element. */\n  private _canBeDescribed(element: Element, message: string|HTMLElement|void): boolean {\n    if (!this._isElementNode(element)) {\n      return false;\n    }\n\n    if (message && typeof message === 'object') {\n      // We'd have to make some assumptions about the description element's text, if the consumer\n      // passed in an element. Assume that if an element is passed in, the consumer has verified\n      // that it can be used as a description.\n      return true;\n    }\n\n    const trimmedMessage = message == null ? '' : `${message}`.trim();\n    const ariaLabel = element.getAttribute('aria-label');\n\n    // We shouldn't set descriptions if they're exactly the same as the `aria-label` of the\n    // element, because screen readers will end up reading out the same text twice in a row.\n    return trimmedMessage ? (!ariaLabel || ariaLabel.trim() !== trimmedMessage) : false;\n  }\n\n  /** Checks whether a node is an Element node. */\n  private _isElementNode(element: Node): element is Element {\n    return element.nodeType === this._document.ELEMENT_NODE;\n  }\n}\n\n/** Gets a key that can be used to look messages up in the registry. */\nfunction getKey(message: string|Element, role?: string): string|Element {\n  return typeof message === 'string' ? `${role || ''}/${message}` : message;\n}\n\n/** Assigns a unique ID to an element, if it doesn't have one already. */\nfunction setMessageId(element: HTMLElement) {\n  if (!element.id) {\n    element.id = `${CDK_DESCRIBEDBY_ID_PREFIX}-${nextId++}`;\n  }\n}\n"]}