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ViewChildren

decorator

Parameter decorator that configures a view query.

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Description

Use to get the QueryList of elements or directives from the view DOM. Any time a child element is added, removed, or moved, the query list will be updated, and the changes observable of the query list will emit a new value.

View queries are set before the ngAfterViewInit callback is called.

Metadata Properties:

  • selector - The directive type or the name used for querying.
  • read - True to read a different token from the queried elements.

Options

Usage notes

import {AfterViewInit, Component, Directive, QueryList, ViewChildren} from '@angular/core';

@Directive({selector: 'child-directive'})
class ChildDirective {
}

@Component({selector: 'someCmp', templateUrl: 'someCmp.html'})
class SomeCmp implements AfterViewInit {
  @ViewChildren(ChildDirective) viewChildren !: QueryList<ChildDirective>;

  ngAfterViewInit() {
    // viewChildren is set
  }
}

Another example

import {AfterViewInit, Component, Directive, Input, QueryList, ViewChildren} from '@angular/core';

@Directive({selector: 'pane'})
export class Pane {
  @Input() id !: string;
}

@Component({
  selector: 'example-app',
  template: `
    <pane id="1"></pane>
    <pane id="2"></pane>
    <pane id="3" *ngIf="shouldShow"></pane>

    <button (click)="show()">Show 3</button>

    <div>panes: {{serializedPanes}}</div>
  `,
})
export class ViewChildrenComp implements AfterViewInit {
  @ViewChildren(Pane) panes !: QueryList<Pane>;
  serializedPanes: string = '';

  shouldShow = false;

  show() { this.shouldShow = true; }

  ngAfterViewInit() {
    this.calculateSerializedPanes();
    this.panes.changes.subscribe((r) => { this.calculateSerializedPanes(); });
  }

  calculateSerializedPanes() {
    setTimeout(() => { this.serializedPanes = this.panes.map(p => p.id).join(', '); }, 0);
  }
}

© 2010–2019 Google, Inc.
Licensed under the Creative Commons Attribution License 4.0.
https://angular.io/api/core/ViewChildren