Accurately locate all ChildComponents throughout the entire Component hierarchy

I am facing a challenge in Angular where I need to retrieve all the ChildComponents from my ParentComponent. The issue is that the ChildComponents are not directly nested within the ParentComponent, but instead they are children of other components which are then children of the parent component.

Consider the following template:

<parent>
    <child>Child 1</child>
    <another_component>
        <child>Child 2</child>
    </another_component>
</parent>

This is how my Parent Component looks like:

export class ParentComponent implements OnInit, AfterViewInit {

@ContentChildren(ChildComponent) entries: QueryList<ChildComponent>;

constructor() {

}

ngOnInit() {

}

ngAfterViewInit() {
  this.entries.toArray().forEach(component => {
    // Only Child 1 is accessible here
  });
}

In conclusion, although only Child 1 is present in the QueryList, I also require access to Child 2.

Answer №1

According to the documentation, it is not possible to "retrieve elements or directives that are in other components' templates, since a component's template is always a black box to its ancestors."

In order to access elements from AnotherComponent, you will need:

@ContentChildren(ChildComponent) entries: QueryList<ChildComponent>;

...

getEntries(): ChildComponent[] {
  return this.entries.toArray();
}

Within ParentComponent:

@ContentChild(AnotherComponent) anotherComponent: AnotherComponent;
@ContentChildren(ChildComponent) entries: QueryList<ChildComponent>;

ngAfterViewInit() {
  const entries = this.entries.toArray().concat(this.anotherComponent.getEntries());
  entries.forEach(component => {
    // Your code.
  });
}

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