@angular/cdk
Version:
Angular Material Component Development Kit
218 lines • 33.4 kB
JavaScript
/**
* @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 { Platform } from '@angular/cdk/platform';
import * as i0 from "@angular/core";
import * as i1 from "@angular/common";
import * as i2 from "@angular/cdk/platform";
/** 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,
/**
* @breaking-change 8.0.0 `_platform` parameter to be made required.
*/
_platform) {
this._platform = _platform;
this._document = _document;
}
/**
* Adds to the host element an aria-describedby reference to a hidden element that contains
* the message. If the same message has already been registered, then it will reuse the created
* message element.
*/
describe(hostElement, message) {
if (!this._canBeDescribed(hostElement, message)) {
return;
}
if (typeof message !== 'string') {
// We need to ensure that the element has an ID.
this._setMessageId(message);
messageRegistry.set(message, { messageElement: message, referenceCount: 0 });
}
else if (!messageRegistry.has(message)) {
this._createMessageElement(message);
}
if (!this._isElementDescribedByMessage(hostElement, message)) {
this._addMessageReference(hostElement, message);
}
}
/** Removes the host element's aria-describedby reference to the message element. */
removeDescription(hostElement, message) {
if (!message || !this._isElementNode(hostElement)) {
return;
}
if (this._isElementDescribedByMessage(hostElement, message)) {
this._removeMessageReference(hostElement, message);
}
// 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(message);
if (registeredMessage && registeredMessage.referenceCount === 0) {
this._deleteMessageElement(message);
}
}
if (messagesContainer && messagesContainer.childNodes.length === 0) {
this._deleteMessagesContainer();
}
}
/** Unregisters all created message elements and removes the message container. */
ngOnDestroy() {
const describedElements = this._document.querySelectorAll(`[${CDK_DESCRIBEDBY_HOST_ATTRIBUTE}]`);
for (let i = 0; i < describedElements.length; i++) {
this._removeCdkDescribedByReferenceIds(describedElements[i]);
describedElements[i].removeAttribute(CDK_DESCRIBEDBY_HOST_ATTRIBUTE);
}
if (messagesContainer) {
this._deleteMessagesContainer();
}
messageRegistry.clear();
}
/**
* Creates a new element in the visually hidden message container element with the message
* as its content and adds it to the message registry.
*/
_createMessageElement(message) {
const messageElement = this._document.createElement('div');
this._setMessageId(messageElement);
messageElement.textContent = message;
this._createMessagesContainer();
messagesContainer.appendChild(messageElement);
messageRegistry.set(message, { messageElement, referenceCount: 0 });
}
/** Assigns a unique ID to an element, if it doesn't have one already. */
_setMessageId(element) {
if (!element.id) {
element.id = `${CDK_DESCRIBEDBY_ID_PREFIX}-${nextId++}`;
}
}
/** Deletes the message element from the global messages container. */
_deleteMessageElement(message) {
const registeredMessage = messageRegistry.get(message);
const messageElement = registeredMessage && registeredMessage.messageElement;
if (messagesContainer && messageElement) {
messagesContainer.removeChild(messageElement);
}
messageRegistry.delete(message);
}
/** Creates the global container for all aria-describedby messages. */
_createMessagesContainer() {
if (!messagesContainer) {
// @breaking-change 8.0.0 `_platform` null check can be removed once the parameter is required
const canBeAriaHidden = !this._platform || (!this._platform.EDGE && !this._platform.TRIDENT);
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;
messagesContainer.classList.add('cdk-visually-hidden');
// IE and Edge won't read out the messages if they're in an `aria-hidden` container.
// We only disable `aria-hidden` for these platforms, because it comes with the
// disadvantage that people might hit the messages when they've navigated past
// the end of the document using the arrow keys.
messagesContainer.setAttribute('aria-hidden', canBeAriaHidden + '');
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, message) {
const registeredMessage = messageRegistry.get(message);
// 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, message) {
const registeredMessage = messageRegistry.get(message);
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, message) {
const referenceIds = getAriaReferenceIds(element, 'aria-describedby');
const registeredMessage = messageRegistry.get(message);
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), i0.ɵɵinject(i2.Platform)); }, token: AriaDescriber, providedIn: "root" });
AriaDescriber.decorators = [
{ type: Injectable, args: [{ providedIn: 'root' },] }
];
AriaDescriber.ctorParameters = () => [
{ type: undefined, decorators: [{ type: Inject, args: [DOCUMENT,] }] },
{ type: Platform }
];
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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 {DOCUMENT} from '@angular/common';\nimport {Inject, Injectable, OnDestroy} from '@angular/core';\nimport {addAriaReferencedId, getAriaReferenceIds, removeAriaReferencedId} from './aria-reference';\nimport {Platform} from '@angular/cdk/platform';\n\n\n/**\n * Interface used to register message elements and keep a count of how many registrations have\n * the same message and the reference to the message element used for the `aria-describedby`.\n */\nexport interface RegisteredMessage {\n  /** The element containing the message. */\n  messageElement: Element;\n\n  /** The number of elements that reference this message element via `aria-describedby`. */\n  referenceCount: number;\n}\n\n/** ID used for the body container where all messages are appended. */\nexport const MESSAGES_CONTAINER_ID = '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|HTMLElement, 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    /**\n     * @breaking-change 8.0.0 `_platform` parameter to be made required.\n     */\n    private _platform?: Platform) {\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|HTMLElement) {\n    if (!this._canBeDescribed(hostElement, message)) {\n      return;\n    }\n\n    if (typeof message !== 'string') {\n      // We need to ensure that the element has an ID.\n      this._setMessageId(message);\n      messageRegistry.set(message, {messageElement: message, referenceCount: 0});\n    } else if (!messageRegistry.has(message)) {\n      this._createMessageElement(message);\n    }\n\n    if (!this._isElementDescribedByMessage(hostElement, message)) {\n      this._addMessageReference(hostElement, message);\n    }\n  }\n\n  /** Removes the host element's aria-describedby reference to the message element. */\n  removeDescription(hostElement: Element, message: string|HTMLElement) {\n    if (!message || !this._isElementNode(hostElement)) {\n      return;\n    }\n\n    if (this._isElementDescribedByMessage(hostElement, message)) {\n      this._removeMessageReference(hostElement, message);\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(message);\n      if (registeredMessage && registeredMessage.referenceCount === 0) {\n        this._deleteMessageElement(message);\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(`[${CDK_DESCRIBEDBY_HOST_ATTRIBUTE}]`);\n\n    for (let i = 0; i < describedElements.length; i++) {\n      this._removeCdkDescribedByReferenceIds(describedElements[i]);\n      describedElements[i].removeAttribute(CDK_DESCRIBEDBY_HOST_ATTRIBUTE);\n    }\n\n    if (messagesContainer) {\n      this._deleteMessagesContainer();\n    }\n\n    messageRegistry.clear();\n  }\n\n  /**\n   * Creates a new element in the visually hidden message container element with the message\n   * as its content and adds it to the message registry.\n   */\n  private _createMessageElement(message: string) {\n    const messageElement = this._document.createElement('div');\n    this._setMessageId(messageElement);\n    messageElement.textContent = message;\n\n    this._createMessagesContainer();\n    messagesContainer!.appendChild(messageElement);\n\n    messageRegistry.set(message, {messageElement, referenceCount: 0});\n  }\n\n  /** Assigns a unique ID to an element, if it doesn't have one already. */\n  private _setMessageId(element: HTMLElement) {\n    if (!element.id) {\n      element.id = `${CDK_DESCRIBEDBY_ID_PREFIX}-${nextId++}`;\n    }\n  }\n\n  /** Deletes the message element from the global messages container. */\n  private _deleteMessageElement(message: string) {\n    const registeredMessage = messageRegistry.get(message);\n    const messageElement = registeredMessage && registeredMessage.messageElement;\n    if (messagesContainer && messageElement) {\n      messagesContainer.removeChild(messageElement);\n    }\n    messageRegistry.delete(message);\n  }\n\n  /** Creates the global container for all aria-describedby messages. */\n  private _createMessagesContainer() {\n    if (!messagesContainer) {\n      // @breaking-change 8.0.0 `_platform` null check can be removed once the parameter is required\n      const canBeAriaHidden = !this._platform || (!this._platform.EDGE && !this._platform.TRIDENT);\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      messagesContainer.classList.add('cdk-visually-hidden');\n\n      // IE and Edge won't read out the messages if they're in an `aria-hidden` container.\n      // We only disable `aria-hidden` for these platforms, because it comes with the\n      // disadvantage that people might hit the messages when they've navigated past\n      // the end of the document using the arrow keys.\n      messagesContainer.setAttribute('aria-hidden', canBeAriaHidden + '');\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, message: string|HTMLElement) {\n    const registeredMessage = messageRegistry.get(message)!;\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\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, message: string|HTMLElement) {\n    const registeredMessage = messageRegistry.get(message)!;\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, message: string|HTMLElement): boolean {\n    const referenceIds = getAriaReferenceIds(element, 'aria-describedby');\n    const registeredMessage = messageRegistry.get(message);\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"]}