@angular/cdk
Version:
Angular Material Component Development Kit
170 lines • 24.9 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 { ContentObserver } from '@angular/cdk/observers';
import { DOCUMENT } from '@angular/common';
import { Directive, ElementRef, Inject, Injectable, Input, NgZone, Optional, } from '@angular/core';
import { LIVE_ANNOUNCER_ELEMENT_TOKEN, LIVE_ANNOUNCER_DEFAULT_OPTIONS, } from './live-announcer-tokens';
import * as i0 from "@angular/core";
import * as i1 from "@angular/cdk/observers";
export class LiveAnnouncer {
constructor(elementToken, _ngZone, _document, _defaultOptions) {
this._ngZone = _ngZone;
this._defaultOptions = _defaultOptions;
// We inject the live element and document as `any` because the constructor signature cannot
// reference browser globals (HTMLElement, Document) on non-browser environments, since having
// a class decorator causes TypeScript to preserve the constructor signature types.
this._document = _document;
this._liveElement = elementToken || this._createLiveElement();
}
announce(message, ...args) {
const defaultOptions = this._defaultOptions;
let politeness;
let duration;
if (args.length === 1 && typeof args[0] === 'number') {
duration = args[0];
}
else {
[politeness, duration] = args;
}
this.clear();
clearTimeout(this._previousTimeout);
if (!politeness) {
politeness =
defaultOptions && defaultOptions.politeness ? defaultOptions.politeness : 'polite';
}
if (duration == null && defaultOptions) {
duration = defaultOptions.duration;
}
// TODO: ensure changing the politeness works on all environments we support.
this._liveElement.setAttribute('aria-live', politeness);
// This 100ms timeout is necessary for some browser + screen-reader combinations:
// - Both JAWS and NVDA over IE11 will not announce anything without a non-zero timeout.
// - With Chrome and IE11 with NVDA or JAWS, a repeated (identical) message won't be read a
// second time without clearing and then using a non-zero delay.
// (using JAWS 17 at time of this writing).
return this._ngZone.runOutsideAngular(() => {
return new Promise(resolve => {
clearTimeout(this._previousTimeout);
this._previousTimeout = setTimeout(() => {
this._liveElement.textContent = message;
resolve();
if (typeof duration === 'number') {
this._previousTimeout = setTimeout(() => this.clear(), duration);
}
}, 100);
});
});
}
/**
* Clears the current text from the announcer element. Can be used to prevent
* screen readers from reading the text out again while the user is going
* through the page landmarks.
*/
clear() {
if (this._liveElement) {
this._liveElement.textContent = '';
}
}
ngOnDestroy() {
clearTimeout(this._previousTimeout);
this._liveElement?.remove();
this._liveElement = null;
}
_createLiveElement() {
const elementClass = 'cdk-live-announcer-element';
const previousElements = this._document.getElementsByClassName(elementClass);
const liveEl = this._document.createElement('div');
// Remove any old containers. This can happen when coming in from a server-side-rendered page.
for (let i = 0; i < previousElements.length; i++) {
previousElements[i].remove();
}
liveEl.classList.add(elementClass);
liveEl.classList.add('cdk-visually-hidden');
liveEl.setAttribute('aria-atomic', 'true');
liveEl.setAttribute('aria-live', 'polite');
this._document.body.appendChild(liveEl);
return liveEl;
}
}
LiveAnnouncer.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "13.2.0", ngImport: i0, type: LiveAnnouncer, deps: [{ token: LIVE_ANNOUNCER_ELEMENT_TOKEN, optional: true }, { token: i0.NgZone }, { token: DOCUMENT }, { token: LIVE_ANNOUNCER_DEFAULT_OPTIONS, optional: true }], target: i0.ɵɵFactoryTarget.Injectable });
LiveAnnouncer.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "13.2.0", ngImport: i0, type: LiveAnnouncer, providedIn: 'root' });
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "13.2.0", ngImport: i0, type: LiveAnnouncer, decorators: [{
type: Injectable,
args: [{ providedIn: 'root' }]
}], ctorParameters: function () { return [{ type: undefined, decorators: [{
type: Optional
}, {
type: Inject,
args: [LIVE_ANNOUNCER_ELEMENT_TOKEN]
}] }, { type: i0.NgZone }, { type: undefined, decorators: [{
type: Inject,
args: [DOCUMENT]
}] }, { type: undefined, decorators: [{
type: Optional
}, {
type: Inject,
args: [LIVE_ANNOUNCER_DEFAULT_OPTIONS]
}] }]; } });
/**
* A directive that works similarly to aria-live, but uses the LiveAnnouncer to ensure compatibility
* with a wider range of browsers and screen readers.
*/
export class CdkAriaLive {
constructor(_elementRef, _liveAnnouncer, _contentObserver, _ngZone) {
this._elementRef = _elementRef;
this._liveAnnouncer = _liveAnnouncer;
this._contentObserver = _contentObserver;
this._ngZone = _ngZone;
this._politeness = 'polite';
}
/** The aria-live politeness level to use when announcing messages. */
get politeness() {
return this._politeness;
}
set politeness(value) {
this._politeness = value === 'off' || value === 'assertive' ? value : 'polite';
if (this._politeness === 'off') {
if (this._subscription) {
this._subscription.unsubscribe();
this._subscription = null;
}
}
else if (!this._subscription) {
this._subscription = this._ngZone.runOutsideAngular(() => {
return this._contentObserver.observe(this._elementRef).subscribe(() => {
// Note that we use textContent here, rather than innerText, in order to avoid a reflow.
const elementText = this._elementRef.nativeElement.textContent;
// The `MutationObserver` fires also for attribute
// changes which we don't want to announce.
if (elementText !== this._previousAnnouncedText) {
this._liveAnnouncer.announce(elementText, this._politeness);
this._previousAnnouncedText = elementText;
}
});
});
}
}
ngOnDestroy() {
if (this._subscription) {
this._subscription.unsubscribe();
}
}
}
CdkAriaLive.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "13.2.0", ngImport: i0, type: CdkAriaLive, deps: [{ token: i0.ElementRef }, { token: LiveAnnouncer }, { token: i1.ContentObserver }, { token: i0.NgZone }], target: i0.ɵɵFactoryTarget.Directive });
CdkAriaLive.ɵdir = i0.ɵɵngDeclareDirective({ minVersion: "12.0.0", version: "13.2.0", type: CdkAriaLive, selector: "[cdkAriaLive]", inputs: { politeness: ["cdkAriaLive", "politeness"] }, exportAs: ["cdkAriaLive"], ngImport: i0 });
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "13.2.0", ngImport: i0, type: CdkAriaLive, decorators: [{
type: Directive,
args: [{
selector: '[cdkAriaLive]',
exportAs: 'cdkAriaLive',
}]
}], ctorParameters: function () { return [{ type: i0.ElementRef }, { type: LiveAnnouncer }, { type: i1.ContentObserver }, { type: i0.NgZone }]; }, propDecorators: { politeness: [{
type: Input,
args: ['cdkAriaLive']
}] } });
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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 {ContentObserver} from '@angular/cdk/observers';\nimport {DOCUMENT} from '@angular/common';\nimport {\n  Directive,\n  ElementRef,\n  Inject,\n  Injectable,\n  Input,\n  NgZone,\n  OnDestroy,\n  Optional,\n} from '@angular/core';\nimport {Subscription} from 'rxjs';\nimport {\n  AriaLivePoliteness,\n  LiveAnnouncerDefaultOptions,\n  LIVE_ANNOUNCER_ELEMENT_TOKEN,\n  LIVE_ANNOUNCER_DEFAULT_OPTIONS,\n} from './live-announcer-tokens';\n\n@Injectable({providedIn: 'root'})\nexport class LiveAnnouncer implements OnDestroy {\n  private _liveElement: HTMLElement;\n  private _document: Document;\n  private _previousTimeout: number;\n\n  constructor(\n    @Optional() @Inject(LIVE_ANNOUNCER_ELEMENT_TOKEN) elementToken: any,\n    private _ngZone: NgZone,\n    @Inject(DOCUMENT) _document: any,\n    @Optional()\n    @Inject(LIVE_ANNOUNCER_DEFAULT_OPTIONS)\n    private _defaultOptions?: LiveAnnouncerDefaultOptions,\n  ) {\n    // We inject the live element and document as `any` because the constructor signature cannot\n    // reference browser globals (HTMLElement, Document) on non-browser environments, since having\n    // a class decorator causes TypeScript to preserve the constructor signature types.\n    this._document = _document;\n    this._liveElement = elementToken || this._createLiveElement();\n  }\n\n  /**\n   * Announces a message to screenreaders.\n   * @param message Message to be announced to the screenreader.\n   * @returns Promise that will be resolved when the message is added to the DOM.\n   */\n  announce(message: string): Promise<void>;\n\n  /**\n   * Announces a message to screenreaders.\n   * @param message Message to be announced to the screenreader.\n   * @param politeness The politeness of the announcer element.\n   * @returns Promise that will be resolved when the message is added to the DOM.\n   */\n  announce(message: string, politeness?: AriaLivePoliteness): Promise<void>;\n\n  /**\n   * Announces a message to screenreaders.\n   * @param message Message to be announced to the screenreader.\n   * @param duration Time in milliseconds after which to clear out the announcer element. Note\n   *   that this takes effect after the message has been added to the DOM, which can be up to\n   *   100ms after `announce` has been called.\n   * @returns Promise that will be resolved when the message is added to the DOM.\n   */\n  announce(message: string, duration?: number): Promise<void>;\n\n  /**\n   * Announces a message to screenreaders.\n   * @param message Message to be announced to the screenreader.\n   * @param politeness The politeness of the announcer element.\n   * @param duration Time in milliseconds after which to clear out the announcer element. Note\n   *   that this takes effect after the message has been added to the DOM, which can be up to\n   *   100ms after `announce` has been called.\n   * @returns Promise that will be resolved when the message is added to the DOM.\n   */\n  announce(message: string, politeness?: AriaLivePoliteness, duration?: number): Promise<void>;\n\n  announce(message: string, ...args: any[]): Promise<void> {\n    const defaultOptions = this._defaultOptions;\n    let politeness: AriaLivePoliteness | undefined;\n    let duration: number | undefined;\n\n    if (args.length === 1 && typeof args[0] === 'number') {\n      duration = args[0];\n    } else {\n      [politeness, duration] = args;\n    }\n\n    this.clear();\n    clearTimeout(this._previousTimeout);\n\n    if (!politeness) {\n      politeness =\n        defaultOptions && defaultOptions.politeness ? defaultOptions.politeness : 'polite';\n    }\n\n    if (duration == null && defaultOptions) {\n      duration = defaultOptions.duration;\n    }\n\n    // TODO: ensure changing the politeness works on all environments we support.\n    this._liveElement.setAttribute('aria-live', politeness);\n\n    // This 100ms timeout is necessary for some browser + screen-reader combinations:\n    // - Both JAWS and NVDA over IE11 will not announce anything without a non-zero timeout.\n    // - With Chrome and IE11 with NVDA or JAWS, a repeated (identical) message won't be read a\n    //   second time without clearing and then using a non-zero delay.\n    // (using JAWS 17 at time of this writing).\n    return this._ngZone.runOutsideAngular(() => {\n      return new Promise(resolve => {\n        clearTimeout(this._previousTimeout);\n        this._previousTimeout = setTimeout(() => {\n          this._liveElement.textContent = message;\n          resolve();\n\n          if (typeof duration === 'number') {\n            this._previousTimeout = setTimeout(() => this.clear(), duration);\n          }\n        }, 100);\n      });\n    });\n  }\n\n  /**\n   * Clears the current text from the announcer element. Can be used to prevent\n   * screen readers from reading the text out again while the user is going\n   * through the page landmarks.\n   */\n  clear() {\n    if (this._liveElement) {\n      this._liveElement.textContent = '';\n    }\n  }\n\n  ngOnDestroy() {\n    clearTimeout(this._previousTimeout);\n    this._liveElement?.remove();\n    this._liveElement = null!;\n  }\n\n  private _createLiveElement(): HTMLElement {\n    const elementClass = 'cdk-live-announcer-element';\n    const previousElements = this._document.getElementsByClassName(elementClass);\n    const liveEl = this._document.createElement('div');\n\n    // Remove any old containers. This can happen when coming in from a server-side-rendered page.\n    for (let i = 0; i < previousElements.length; i++) {\n      previousElements[i].remove();\n    }\n\n    liveEl.classList.add(elementClass);\n    liveEl.classList.add('cdk-visually-hidden');\n\n    liveEl.setAttribute('aria-atomic', 'true');\n    liveEl.setAttribute('aria-live', 'polite');\n\n    this._document.body.appendChild(liveEl);\n\n    return liveEl;\n  }\n}\n\n/**\n * A directive that works similarly to aria-live, but uses the LiveAnnouncer to ensure compatibility\n * with a wider range of browsers and screen readers.\n */\n@Directive({\n  selector: '[cdkAriaLive]',\n  exportAs: 'cdkAriaLive',\n})\nexport class CdkAriaLive implements OnDestroy {\n  /** The aria-live politeness level to use when announcing messages. */\n  @Input('cdkAriaLive')\n  get politeness(): AriaLivePoliteness {\n    return this._politeness;\n  }\n  set politeness(value: AriaLivePoliteness) {\n    this._politeness = value === 'off' || value === 'assertive' ? value : 'polite';\n    if (this._politeness === 'off') {\n      if (this._subscription) {\n        this._subscription.unsubscribe();\n        this._subscription = null;\n      }\n    } else if (!this._subscription) {\n      this._subscription = this._ngZone.runOutsideAngular(() => {\n        return this._contentObserver.observe(this._elementRef).subscribe(() => {\n          // Note that we use textContent here, rather than innerText, in order to avoid a reflow.\n          const elementText = this._elementRef.nativeElement.textContent;\n\n          // The `MutationObserver` fires also for attribute\n          // changes which we don't want to announce.\n          if (elementText !== this._previousAnnouncedText) {\n            this._liveAnnouncer.announce(elementText, this._politeness);\n            this._previousAnnouncedText = elementText;\n          }\n        });\n      });\n    }\n  }\n  private _politeness: AriaLivePoliteness = 'polite';\n\n  private _previousAnnouncedText?: string;\n  private _subscription: Subscription | null;\n\n  constructor(\n    private _elementRef: ElementRef,\n    private _liveAnnouncer: LiveAnnouncer,\n    private _contentObserver: ContentObserver,\n    private _ngZone: NgZone,\n  ) {}\n\n  ngOnDestroy() {\n    if (this._subscription) {\n      this._subscription.unsubscribe();\n    }\n  }\n}\n"]}