87 lines
2.0 KiB
TypeScript
87 lines
2.0 KiB
TypeScript
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// #docregion
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import {
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Component, Input, Output,
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OnChanges, SimpleChange,
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} from 'angular2/core';
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import {Spy} from './spy.directive';
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import {LoggerService} from './logger.service';
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@Component({
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selector: 'my-counter',
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template: `
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<div class="counter">
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Counter = {{counter}}
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<h5>-- Counter Change Log --</h5>
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<div *ngFor="#chg of changeLog" my-spy>{{chg}}</div>
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</div>
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`,
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styles: ['.counter {background: LightYellow; padding: 8px; margin-top: 8px}'],
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directives:[Spy]
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})
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export class MyCounter implements OnChanges {
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@Input() counter: number;
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changeLog:string[] = [];
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ngOnChanges(changes: {[propertyName: string]: SimpleChange}) {
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// Empty the changeLog whenever counter goes to zero
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// hint: this is a way to respond programmatically to external value changes.
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if (this.counter === 0) {
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this.changeLog.length = 0;
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}
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// A change to `counter` is the only change we care about
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let prop = changes['counter'];
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let cur = prop.currentValue;
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let prev = JSON.stringify(prop.previousValue); // first time is {}; after is integer
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this.changeLog.push(`counter: currentValue = ${cur}, previousValue = ${prev}`);
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}
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}
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/***************************************/
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@Component({
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selector: 'counter-parent',
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template: `
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<div class="parent">
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<h2>Counter Spy</h2>
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<button (click)="updateCounter()">Update counter</button>
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<button (click)="reset()">Reset Counter</button>
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<my-counter [counter]="value"></my-counter>
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<h4>-- Spy Lifecycle Hook Log --</h4>
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<div *ngFor="#msg of spyLog">{{msg}}</div>
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</div>
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`,
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styles: ['.parent {background: gold; padding: 10px; margin:100px 8px;}'],
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directives: [MyCounter],
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providers: [LoggerService]
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})
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export class CounterParentComponent {
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value: number;
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spyLog:string[] = [];
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private _logger:LoggerService;
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constructor(logger:LoggerService){
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this._logger = logger;
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this.spyLog = logger.logs;
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this.reset();
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}
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updateCounter() {
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this.value += 1;
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}
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reset(){
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this._logger.log('-- reset --');
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this.value=0;
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}
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}
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