angular - 捕获从 中的组件发出的事件？

Question

我有一个使用 <ng-content> 的自定义模态组件嵌入内容:

@Component({
  selector: 'modal-container',
  template: `
    <div [class]="css">
      <div [attr.id]="id" class="reveal" (open)="openModal()">
        <ng-content></ng-content>
      </div>
    </div>
  `
})
export class ModalContainerComponent {
    . . .
}

在<ng-content>的内容中我有一个组件发出 open事件:

@Component({
  selector: 'login-modal',
  template: `
    <modal-container [id]="'login-modal'">
      <section>...</section>
    </modal-container>
  `,
})
export class LoginModalComponent implements OnInit {

    @Output()
    open = new EventEmitter();

    ngOnInit(): void {
        // Here I am checking an ngrx store with code that is not included
        if (state.openLoginModal) {
          this.open.emit();
        }
    }

}

然而，ModalContainerComponent永远不会收到事件。

例如:

• How to observe input element changes in ng-content
• Angular 2: capture events from ng-content

即将短缺。我做错了什么？

---

更新:

自 @Output事件不会冒泡，我决定使用自定义指令来发出事件:

import { Directive, ElementRef, Renderer } from '@angular/core';


@Directive({
  selector: '[open-modal]',
  host: { '(click)': 'openModal()' }
})
export class OpenModalDirective {

  constructor(
    private elementRef: ElementRef,
    private renderer: Renderer
  ) {}

  openModal(): void {
    this.renderer.invokeElementMethod(this.elementRef.nativeElement,
      'dispatchEvent',
      [new CustomEvent('open-modal-container', { bubbles: true })]);
  }

}

使用:in Angular2 how to know when ANY form input field lost focus举个例子。

但是，我还是无法在ModalContainerComponent中获取到自定义事件。 :

@HostListener('open-modal-container')
openModalContainer(): void {
  console.log('openModal() was invoked');
}

我可以记录点击事件，所以它正在发生，但主机监听器失败了。想法？

---

更新2

我放弃了这种支持共享服务的方法，但我遇到了 .next() 的问题未向订户提供值(value):Subscriber doesn't receive value from .next()

Answer 1

您可以使用 @ContentChild() 获取登录模式的实例并手动订阅打开事件

@Component({
    selector: 'modal-container',
    template: `
    <div [class]="css">
      <div [attr.id]="id" class="reveal" (open)="openModal()">
        <ng-content></ng-content>
      </div>
    </div>
  `
})
export class ModalContainerComponent {
    @ContentChild(LoginModalComponent)
    loginModal: LoginModalComponent;

    ngAfterViewInit() {
        this.loginModal.open.subscribe((event) => {
            //Handel event here
        });
    }
}