103 lines
		
	
	
		
			2.7 KiB
		
	
	
	
		
			TypeScript
		
	
	
	
	
	
			
		
		
	
	
			103 lines
		
	
	
		
			2.7 KiB
		
	
	
	
		
			TypeScript
		
	
	
	
	
	
| // #docregion
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| import {
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|   Component, Input, Output,
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|   AfterContentChecked, AfterContentInit, ContentChild,
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|   AfterViewInit, ViewChild
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| } from 'angular2/core';
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| 
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| import {ChildComponent} from './child.component';
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| import {LoggerService}  from './logger.service';
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| 
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| @Component({
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|   selector: 'after-content',
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|   template: `
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|   <div class="after-content">
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|     <div>-- child content begins --</div>
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| 
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|     <ng-content></ng-content>
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| 
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|     <div>-- child content ends --</div>
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|   </div>
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|   `,
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|   styles: ['.after-content {background: LightCyan; padding: 8px;}'],
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| 
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| })
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| export class AfterContentComponent
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|   implements AfterContentChecked, AfterContentInit, AfterViewInit {
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| 
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|   private _logger:LoggerService;
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| 
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|   constructor(logger:LoggerService){
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|     this._logger = logger;
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|     logger.log('AfterContent ctor: ' + this._getMessage());
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|   }
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| 
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|   // Query for a CONTENT child of type `ChildComponent`
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|   @ContentChild(ChildComponent) contentChild: ChildComponent;
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| 
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|   // Query for a VIEW child of type`ChildComponent`
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|   // No such VIEW child exists!
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|   // This component holds content but no view of that type.
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|   @ViewChild(ChildComponent) viewChild: ChildComponent;
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| 
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| 
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|   ///// Hooks
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|   ngAfterContentInit() {
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|     // contentChild is set after the content has been initialized
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|     this._logger.log('AfterContentInit: ' + this._getMessage());
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|   }
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| 
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|   ngAfterViewInit() {
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|     this._logger.log(`AfterViewInit: There is ${this.viewChild ? 'a' : 'no'} view child`);
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|   }
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| 
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|   private _prevHero:string;
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|   ngAfterContentChecked() {
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|     // contentChild is updated after the content has been checked
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|     // Called frequently; only report when the hero changes
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|     if (!this.contentChild || this._prevHero === this.contentChild.hero) {return;}
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|     this._prevHero = this.contentChild.hero;
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|     this._logger.log('AfterContentChecked: ' + this._getMessage());
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|   }
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| 
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|   private _getMessage(): string {
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|     let cmp = this.contentChild;
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|     return cmp ? `"${cmp.hero}" child content` : 'no child content';
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|   }
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| 
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| }
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| 
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| /***************************************/
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| 
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| @Component({
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|   selector: 'after-content-parent',
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|   template: `
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|   <div class="parent">
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|     <h2>AfterContent</h2>
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| 
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|     <after-content>
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|       <input [(ngModel)]="hero">
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|       <button (click)="showChild = !showChild">Toggle child view</button>
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| 
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|       <my-child *ngIf="showChild" [hero]="hero"></my-child>
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|     </after-content>
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| 
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|     <h4>-- Lifecycle Hook Log --</h4>
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|     <div *ngFor="#msg of hookLog">{{msg}}</div>
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|   </div>
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|   `,
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|   styles: ['.parent {background: powderblue; padding: 8px; margin:100px 8px;}'],
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|   directives: [AfterContentComponent, ChildComponent],
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|   providers:[LoggerService]
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| })
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| export class AfterContentParentComponent {
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| 
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|   hookLog:string[];
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|   hero = 'Magneta';
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|   showChild = true;
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| 
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|   constructor(logger:LoggerService){
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|     this.hookLog = logger.logs;
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|   }
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| }
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