Question

我有一个组件可以在单击关闭按钮时从页面中删除。我已经暴露了一个testClose事件，用户可以在组件关闭时注册以执行某些工作。当组件关闭时，如何注册该事件以调用函数？例如，当TestComponent关闭时，我想将closeCounter增加1。这是plnkr：

https://plnkr.co/edit/iGyzIkUQOTCGwaDqr8o0?p=preview

暴露事件的TestComponent：

import {Component, Input, Output, EventEmitter} from 'angular2/core';

@Component({
  selector: 'test',
  template: `
      <div class="box" *ngIf="!_close">
        <button class="close" (click)="close()">x</button>
      </div>
    `,
    styles:[
      `
        .box{
          background: yellow;
          height: 100px;
          width: 100px;
        }
      ` 
    ]
})
export class TestComponent{

  @Input("testClose") _close = false;
  @Output("testCloseChange") _closeChange = new EventEmitter<boolean>(false);

  close(): void{
    this._close = true;
    this._closeChange.emit(true);
  }

  open(): void{
    this._close = false;
    this._closeChange.emit(true);
  }

}

App Component应该注册到TestComponent的close事件来调用某个函数。

import {Component} from 'angular2/core';
import {TestComponent} from './test.component';

@Component({
    selector: "my-app",
    template: `
      <div class="container">
        <test [testClose]="isClose"></test>
        Close Count: {{closeCount}}
      </div>
    `,
    directives: [TestComponent]
})
export class AppComponent{

  isClose: boolean = false;
  closeCount: number = 0;

  incrementClose(): void{
    this.closeCount++;
  }

}

Answer 1

只需为正在发出的事件添加一个侦听器

(testCloseChange)="onTestCloseChange($event)"

因此，应用程序组件模板将如下所示

<div class="container">
   <test [testClose]="isClose" (testCloseChange)="onTestCloseChange($event)"></test>
   Close Count: {{closeCount}}
</div>

在App组件类中，您应该定义onTestCloseChange

export class AppComponent{

  onTestCloseChange(event) {

  }

}

Angular 2在发出事件时调用函数/方法

1 个答案: