组件可以调用自毁事件吗 [英] Can component invoke a self destroy event

问题描述

我有一个父组件，单击链接后会打开一个新组件，这个新组件应该有一个关闭按钮，当关闭时，该按钮会向父母发送一个关闭消息并销毁自身.

I have a parent component which opens a new component on click of a link, this new component is supposed to have a close button which on close sends a closing message to parent and destroy itself.

我们可以使用ngOnDestroy方法发送关闭消息，但是如何调用子组件的销毁.

We can send the closing message using ngOnDestroy method, but how do I invoke the destroying of the child component.

<parent>
    <child></child> //child to be opened on click but close 
                    //event should be inside the child componenet
</parent>

如果我在这里遇到一些概念上的错误，请纠正我.谢谢

Do correct me if i am having some conceptual mistake here. Thanks

推荐答案

如果您使用ViewContainerRef.createComponent()添加组件，如

If you add a component using ViewContainerRef.createComponent() like shown in Angular 2 dynamic tabs with user-click chosen components, then the component can destroy itself when you pass cmpRef to the created component.

否则，我认为没有办法.您可以将值传递给父级，以便*ngIf删除该组件.

Otherwise I don't think there is a way. You can pass a value to the parent so that an *ngIf removes the component.

<child *ngIf="showChild" (close)="showChild = false"></child>

class ParentComponent {
  showChild:boolean = true;
}

class ChildComponent {
  @Output() close = new EventEmitter();

  onClose() {
    this.close.emit(null);
  }
}

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