58 lines
1.6 KiB
TypeScript
58 lines
1.6 KiB
TypeScript
// #docplaster
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// #docregion vc
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import { AfterViewInit, ViewChild } from '@angular/core';
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// #docregion lv
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import { Component } from '@angular/core';
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import { CountdownTimerComponent } from './countdown-timer.component';
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// #enddocregion lv
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// #enddocregion vc
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//// Local variable, #timer, version
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// #docregion lv
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@Component({
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selector: 'countdown-parent-lv',
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template: `
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<h3>Countdown to Liftoff (via local variable)</h3>
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<button (click)="timer.start()">Start</button>
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<button (click)="timer.stop()">Stop</button>
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<div class="seconds">{{timer.seconds}}</div>
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<countdown-timer #timer></countdown-timer>
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`,
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styleUrls: ['demo.css']
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})
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export class CountdownLocalVarParentComponent { }
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// #enddocregion lv
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//// View Child version
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// #docregion vc
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@Component({
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selector: 'countdown-parent-vc',
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template: `
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<h3>Countdown to Liftoff (via ViewChild)</h3>
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<button (click)="start()">Start</button>
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<button (click)="stop()">Stop</button>
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<div class="seconds">{{ seconds() }}</div>
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<countdown-timer></countdown-timer>
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`,
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styleUrls: ['demo.css']
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})
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export class CountdownViewChildParentComponent implements AfterViewInit {
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@ViewChild(CountdownTimerComponent)
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private timerComponent: CountdownTimerComponent;
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seconds() { return 0; }
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ngAfterViewInit() {
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// Redefine `seconds()` to get from the `CountdownTimerComponent.seconds` ...
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// but wait a tick first to avoid one-time devMode
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// unidirectional-data-flow-violation error
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setTimeout(() => this.seconds = () => this.timerComponent.seconds, 0);
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}
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start() { this.timerComponent.start(); }
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stop() { this.timerComponent.stop(); }
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}
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// #enddocregion vc
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