Angular2 ngOnDestroy,发出事件

Question

是否可以在ngOnDestroy上发出自定义事件？我试过,但似乎它不起作用......我基本上需要知道从UI中删除指令的时间.

@Output() rowInit = new EventEmitter();
@Output() rowDestroy = new EventEmitter();

ngAfterViewInit() {

    this.rowInit.emit(this);
}

ngOnDestroy() {
    console.log("I get called, but not emit :(, ngAfterViewInit works :)");
    this.rowDestroy.emit(this);
}

Answer 1

我认为您可以使用EventEmitter服务中定义的而不是组件本身.这样,您的组件将利用服务的此属性来发出事件.

import {EventEmitter} from 'angular2/core';

export class NotificationService {
  onDestroyEvent: EventEmitter<string> = new EventEmitter();
  constructor() {}
}

export class MyComponent implements OnDestroy {
  constructor(service:NotificationService) {
    this.service = service;
  }

  ngOnDestroy() {
    this.service.onDestroyEvent.emit('component destroyed');
  }
}

其他元素/组件可以在此EventEmitter上订阅以通知:

this.service.onDestroyEvent.subscribe(data => { ... });

希望它对你有帮助,蒂埃里