Question

我正在尝试使用Material 2 sidenav计算如何在子组件模板点击事件#rightNav中触发父组件模板中的本地引用，即(click)="rightNav.open()"。我想我需要使用@ViewChild注释，但不确定如何。

子组件模板（app-conditions-list）：

<div *ngFor="let condition of conditions" [class.selected]="condition === selectedCondition"
            (click)="rightNav.open()"></div>

父组件模板（条件组件）：

import { Component} from '@angular/core';
import { ConditionsListComponent } from './listComponent/conditions-list.component';


@Component({
    moduleId: module.id,
    selector: 'app-conditions',
    template: `
            <md-sidenav #rightNav align="end" mode="side">
            "Condition details will open here on click event"
            </md-sidenav>
            <app-conditions-list></app-conditions-list>`,
    styleUrls: ['./conditions.component.css'],
    directives: [
        ConditionsListComponent,
    ]
})

export class ConditionsComponent  {
    title = "Conditions Manager"
}

子组件嵌套在父组件模板中。谢谢！

Answer 1

您可以向子组件添加输出并从中侦听事件

export class ConditionsListComponent {
  @Output() navOpen:EventEmitter = new EventEmitter();
}

您可以使用模板变量来引用兄弟元素，如：

<div #rightNav align="end" mode="side" (close)="close($event)"</div>
<app-conditions-list (navOpen)="rightNav.open()"></app-conditions-list>`,

并举办像

这样的活动

<div *ngFor="let condition of conditions" [class.selected]="condition === selectedCondition"
        (click)="navOpen.next(null)"></div>

Answer 2

您需要将您的活动从您的孩子冒充到您的父母：

The child :  

export class ConditionsListComponent  {
   @Output('myEvent') myEvent = new EventEmitter();

   private bubbleUp($event:Event){

     myEvent.emit($event)
  }
}

它的观点：

  <div *ngFor="let condition of conditions" [class.selected]="condition === selectedCondition"
        (click)="bubbleUp($event)"></div>

父母：

     import { Component} from '@angular/core';

@Component({
moduleId: module.id,
selector: 'app-conditions',
template: `
        <div #rightNav align="end" mode="side" (close)="close($event)"</div>
        <app-conditions-list (myEvent)='gotTheEvent($event)' ></app-conditions-list>`,
styleUrls: ['./conditions.component.css'],
providers: [],
directives: [
    ConditionsListComponent,
]
})

export class ConditionsComponent  {
   title = "Conditions Manager";

   gotTheEvent($event){

     console.log('I got this event from my child',$event);

    //you can do whatever you want : 

     rightNav.open()
  }
}

如何在Angular 2中从子组件事件触发父组件中的本地引用？

2 个答案: