我有一个组件,单击关闭按钮后可以从页面中删除它.我公开了一个 testClose 事件,当组件关闭时,用户可以注册该事件以执行某些工作.关闭组件后,如何注册该事件以调用函数?例如,当TestComponent关闭时,我想将closeCounter递增1.这是plnkr:
I have a component which can be removed from the page when a close button is clicked. I have exposed a testClose event that a user can register to do some work when the component is closed. How do I register to that event to call a function when the component is closed? For example, I would like to increment the closeCounter by 1 when the TestComponent is closed. Here is the plnkr:
plnkr.co/edit/iGyzIkUQOTCGwaDqr8o0?p=preview
暴露事件的TestComponent:
TestComponent which exposes an event:
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); } }应注册到TestComponent的close事件以调用某些功能的应用程序组件.
App Component which should register to the close event of the TestComponent to call some function.
import {Component} from 'angular2/core'; import {TestComponent} from './testponent'; @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++; } } 推荐答案只需向正在发出的事件添加一个侦听器
Just add a listener to the event being emitted
(testCloseChange)="onTestCloseChange($event)"因此,应用程序组件模板将如下所示
So app component template will look like this
<div class="container"> <test [testClose]="isClose" (testCloseChange)="onTestCloseChange($event)"></test> Close Count: {{closeCount}} </div>在App组件类中,您应该定义onTestCloseChange
And inside the App component class you should define the onTestCloseChange
export class AppComponent{ onTestCloseChange(event) { } }更多推荐
发出事件时,Angular 2调用函数/方法
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