Angular12：一次触发多个子组件

Question

我有这样一种情况，父组件呈现了 5 个不同的子组件，并且在父组件单击按钮或父组件的值发生更改时，所有 5 个子组件都应该做某事（执行一个方法）

请推荐Angular 12 或 13 版本

的站立练习

Answer 1

我建议共享服务和 RXJS Subject。

举个例子：https://stackblitz.com/edit/angular-ivy-fvllm7?file=src/app/app.component.ts

服务

@Injectable({
  providedIn: 'root',
})
export class DoSomethingService {
  subject = new Subject<void>();
}

Parent

export class AppComponent {
  constructor(private doSomethingService: DoSomethingService) {}

  makeSomethingHappen() {
    this.doSomethingService.subject.next();
  }
}

<button (click)="makeSomethingHappen()">CLICK ME</button>

<app-one></app-one>
<app-two></app-two>
<app-three></app-three>

Children

export class OneComponent implements OnInit {
  message = 'Component one standing by...';
  sub = new Subscription();

  constructor(private doSomethingService: DoSomethingService) {}

  ngOnInit() {
    this.sub = this.doSomethingService.subject.subscribe(() =>
      this.doSomething()
    );
  }

  doSomething() {
    this.message = 'Component one did something!';
  }

  ngOnDestroy() {
    this.sub.unsubscribe();
  }
}

Angular12：一次触发多个子组件

Angular 12: Trigger multiple child components at once

angularjs

angular