ViewChildren with templateRef

Question

I want to use ViewChildren make QueryList from TemplateRef, but can't pass to input component.

For example

Component.ts:

@ViewChildren(TemplateRef) cellTemplates: QueryList<TemplateRef<any>>;

View:

<my-component [templatesRef]="cellTemplates"></my-component>

Input :

_templatesRef;
@Input()
set templatesRef(refs: any) {
   this._templatesRef = refs;
}

ExpressionChangedAfterItHasBeenCheckedError: Expression has changed after it was checked. Previous value: 'ngIf: false'. Current value: 'ngIf: true'.

See in Stackbilitz

Answer 1

You should force parent to detect changes after getting the cellTemplates from template, so try to use ChangeDetectorRef in parent:

export class AppComponent  {
  name = 'Angular';
  @ViewChildren(TemplateRef, {read: TemplateRef}) cellTemplates: QueryList<TemplateRef<any>>;
  constructor(private cd: ChangeDetectorRef) { }
  ngOnInit(){ }
  ngAfterViewInit(){
    this.cd.detectChanges();
  }
}

You can find detailed explanations about that exception in this article.

DEMO 🚀🚀