76 lines
1.9 KiB
TypeScript
76 lines
1.9 KiB
TypeScript
/**
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* @license
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* Copyright Google LLC All Rights Reserved.
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*
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* Use of this source code is governed by an MIT-style license that can be
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* found in the LICENSE file at https://angular.io/license
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*/
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import {Component} from '@angular/core';
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import {Observable, Observer} from 'rxjs';
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// #docregion AsyncPipePromise
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@Component({
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selector: 'async-promise-pipe',
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template: `<div>
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<code>promise|async</code>:
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<button (click)="clicked()">{{ arrived ? 'Reset' : 'Resolve' }}</button>
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<span>Wait for it... {{ greeting | async }}</span>
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</div>`
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})
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export class AsyncPromisePipeComponent {
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greeting: Promise<string>|null = null;
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arrived: boolean = false;
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private resolve: Function|null = null;
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constructor() {
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this.reset();
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}
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reset() {
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this.arrived = false;
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this.greeting = new Promise<string>((resolve, reject) => {
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this.resolve = resolve;
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});
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}
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clicked() {
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if (this.arrived) {
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this.reset();
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} else {
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this.resolve!('hi there!');
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this.arrived = true;
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}
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}
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}
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// #enddocregion
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// #docregion AsyncPipeObservable
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@Component({
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selector: 'async-observable-pipe',
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template: '<div><code>observable|async</code>: Time: {{ time | async }}</div>'
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})
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export class AsyncObservablePipeComponent {
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time = new Observable<string>((observer: Observer<string>) => {
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setInterval(() => observer.next(new Date().toString()), 1000);
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});
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}
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// #enddocregion
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// For some reason protractor hangs on setInterval. So we will run outside of angular zone so that
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// protractor will not see us. Also we want to have this outside the docregion so as not to confuse
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// the reader.
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function setInterval(fn: Function, delay: number) {
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const zone = (window as any)['Zone'].current;
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let rootZone = zone;
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while (rootZone.parent) {
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rootZone = rootZone.parent;
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}
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rootZone.run(() => {
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window.setInterval(function(this: unknown) {
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zone.run(fn, this, arguments as any);
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}, delay);
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});
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}
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