@angular/cdk
Version:
Angular Material Component Development Kit
185 lines • 25.6 kB
JavaScript
import { __read } from "tslib";
/**
* @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_material/src/cdk/a11y/live-announcer/live-announcer-tokens";
import * as i2 from "@angular/common";
var LiveAnnouncer = /** @class */ (function () {
function LiveAnnouncer(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();
}
LiveAnnouncer.prototype.announce = function (message) {
var _a;
var _this = this;
var args = [];
for (var _i = 1; _i < arguments.length; _i++) {
args[_i - 1] = arguments[_i];
}
var defaultOptions = this._defaultOptions;
var politeness;
var duration;
if (args.length === 1 && typeof args[0] === 'number') {
duration = args[0];
}
else {
_a = __read(args, 2), politeness = _a[0], duration = _a[1];
}
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(function () {
return new Promise(function (resolve) {
clearTimeout(_this._previousTimeout);
_this._previousTimeout = setTimeout(function () {
_this._liveElement.textContent = message;
resolve();
if (typeof duration === 'number') {
_this._previousTimeout = setTimeout(function () { return _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.
*/
LiveAnnouncer.prototype.clear = function () {
if (this._liveElement) {
this._liveElement.textContent = '';
}
};
LiveAnnouncer.prototype.ngOnDestroy = function () {
clearTimeout(this._previousTimeout);
if (this._liveElement && this._liveElement.parentNode) {
this._liveElement.parentNode.removeChild(this._liveElement);
this._liveElement = null;
}
};
LiveAnnouncer.prototype._createLiveElement = function () {
var elementClass = 'cdk-live-announcer-element';
var previousElements = this._document.getElementsByClassName(elementClass);
var liveEl = this._document.createElement('div');
// Remove any old containers. This can happen when coming in from a server-side-rendered page.
for (var i = 0; i < previousElements.length; i++) {
previousElements[i].parentNode.removeChild(previousElements[i]);
}
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.decorators = [
{ type: Injectable, args: [{ providedIn: 'root' },] }
];
/** @nocollapse */
LiveAnnouncer.ctorParameters = function () { return [
{ type: undefined, decorators: [{ type: Optional }, { type: Inject, args: [LIVE_ANNOUNCER_ELEMENT_TOKEN,] }] },
{ type: NgZone },
{ type: undefined, decorators: [{ type: Inject, args: [DOCUMENT,] }] },
{ type: undefined, decorators: [{ type: Optional }, { type: Inject, args: [LIVE_ANNOUNCER_DEFAULT_OPTIONS,] }] }
]; };
LiveAnnouncer.ɵprov = i0.ɵɵdefineInjectable({ factory: function LiveAnnouncer_Factory() { return new LiveAnnouncer(i0.ɵɵinject(i1.LIVE_ANNOUNCER_ELEMENT_TOKEN, 8), i0.ɵɵinject(i0.NgZone), i0.ɵɵinject(i2.DOCUMENT), i0.ɵɵinject(i1.LIVE_ANNOUNCER_DEFAULT_OPTIONS, 8)); }, token: LiveAnnouncer, providedIn: "root" });
return LiveAnnouncer;
}());
export { LiveAnnouncer };
/**
* A directive that works similarly to aria-live, but uses the LiveAnnouncer to ensure compatibility
* with a wider range of browsers and screen readers.
*/
var CdkAriaLive = /** @class */ (function () {
function CdkAriaLive(_elementRef, _liveAnnouncer, _contentObserver, _ngZone) {
this._elementRef = _elementRef;
this._liveAnnouncer = _liveAnnouncer;
this._contentObserver = _contentObserver;
this._ngZone = _ngZone;
this._politeness = 'off';
}
Object.defineProperty(CdkAriaLive.prototype, "politeness", {
/** The aria-live politeness level to use when announcing messages. */
get: function () { return this._politeness; },
set: function (value) {
var _this = this;
this._politeness = value === 'polite' || value === 'assertive' ? value : 'off';
if (this._politeness === 'off') {
if (this._subscription) {
this._subscription.unsubscribe();
this._subscription = null;
}
}
else if (!this._subscription) {
this._subscription = this._ngZone.runOutsideAngular(function () {
return _this._contentObserver
.observe(_this._elementRef)
.subscribe(function () {
// Note that we use textContent here, rather than innerText, in order to avoid a reflow.
var 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;
}
});
});
}
},
enumerable: true,
configurable: true
});
CdkAriaLive.prototype.ngOnDestroy = function () {
if (this._subscription) {
this._subscription.unsubscribe();
}
};
CdkAriaLive.decorators = [
{ type: Directive, args: [{
selector: '[cdkAriaLive]',
exportAs: 'cdkAriaLive',
},] }
];
/** @nocollapse */
CdkAriaLive.ctorParameters = function () { return [
{ type: ElementRef },
{ type: LiveAnnouncer },
{ type: ContentObserver },
{ type: NgZone }
]; };
CdkAriaLive.propDecorators = {
politeness: [{ type: Input, args: ['cdkAriaLive',] }]
};
return CdkAriaLive;
}());
export { 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\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() @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\n    if (this._liveElement && this._liveElement.parentNode) {\n      this._liveElement.parentNode.removeChild(this._liveElement);\n      this._liveElement = null!;\n    }\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].parentNode!.removeChild(previousElements[i]);\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\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 { return this._politeness; }\n  set politeness(value: AriaLivePoliteness) {\n    this._politeness = value === 'polite' || value === 'assertive' ? value : 'off';\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\n          .observe(this._elementRef)\n          .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 = 'off';\n\n  private _previousAnnouncedText?: string;\n  private _subscription: Subscription | null;\n\n  constructor(private _elementRef: ElementRef, private _liveAnnouncer: LiveAnnouncer,\n              private _contentObserver: ContentObserver, private _ngZone: NgZone) {}\n\n  ngOnDestroy() {\n    if (this._subscription) {\n      this._subscription.unsubscribe();\n    }\n  }\n}\n"]}