如何要求子组件访问它的 html 模板并使用组件的类实例在父组件的 UI 上显示某些内容？

Question

I am working on one project in which, I have 2 component :

1. Main component,
2. Popup component

Main Component TS:

popupCompo = new popupComponent();

onButtonClick() {
   popupCompo.showModal();
}

popup Component TS :

==> HTML

<ng-template #popup>
...
</ng-template>

==> TS :

@Viewchild("popup") popupElement : Elementref;

constructor(public modalService: NgbModalService) {}

showModal() {
   console.log("popupElement", this.popupElement);         // undefine
   this.modalService.open(this.popupElement, {...});
}

console in above child's function will be undefined if showModal() is called from parent on button click. If showModal() function will click from child component, then it will put log without any undefine.

I can't move html template at any other places.

StackBlitz : https://stackblitz.com/edit/angular-multiple-component-th9dna?devtoolsheight=33&file=src/app/dy1.component.ts

It might due to @viewchild can't access outside of class. Is there any this kind of code possible to access child's viewChild reference? :

onButtonClick() {
   popupCompo.showModal.bind(popupCompo)
}

So that showModal will call in a context of child component instead of parent class.

How can I show modal from child component , Please guide me what Can I do for access viewchild when call method from parent class.

Answer 1

You have to use ViewChild again.

Try this in app.component.ts and app.component.html :

// assign reference variable to child element
<dy1 #child></dy1>
<button (click)="getchildP()">parent : get P</button>
......
@Component({
  selector: 'my-app',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})
export class AppComponent {
  compo1: any;
  demo = 'string';
  // get a handle on the child component
  @ViewChild('child') dy1Component: Dy1Component;
  constructor() {
    
  }
  ngOnInit() {}

  getchildP() {
    // use the reference
    this.dy1Component.getP();
  }
}

Your way doesn't work because you're creating a new instance of the child component and not grabbing a handle on the instance that your parent component creates in the HTML.