ContentChildren class

Declares a reference to multiple child nodes projected into <ng-content>.

The annotated List is replaced when the DOM is updated.

Example

@Component(
  selector: 'root-comp',
  directives: [TabPanelComponent, TabComponent],
  template: '''
    <tab-panel>
      <tab-comp></tab-comp>
      <tab-comp></tab-comp>
      <tab-comp></tab-comp>
    </tab-panel>
  ''',
)
class RootComponent {}

@Component(
  selector: 'tab-comp',
  template: 'I am a Tab!',
)
class TabComponent {}

@Component(
  selector: 'tab-panel',
  template: '<ng-content></ng-content>',
)
class TabPanelComponent implements AfterContentInit {
  @ContentChildren(TabComponent)
  List<TabComponent> tabs;

  @override
  void ngAfterContentInit() {
    for (var tab in tabs) {
      // Do something.
    }
  }
}

See ViewChildren for a full documentation of parameters and more examples.

WARNING: There is a known issue (b/129297484) where, when used in combination with an NgFor (or a custom directive that supports moving embedded views) this field or setter may not be updated. For details see go/angular-dart/dev/template-queries.

Annotations
  • @Target({TargetKind.field, TargetKind.setter})

Constructors

ContentChildren(Object selector, {bool descendants = true, Object? read})
const

Properties

descendants → bool
Whether to query only direct children (false) or all children (true).
finalinherited
first → bool
Whether to only query the first child.
finalinherited
hashCode → int
The hash code for this object.
no setterinherited
read → Object?
The DI token to read from an element that matches the selector.
finalinherited
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
selector → Object
Either the class Type or selector String.
finalinherited

Methods

noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
toString() → String
A string representation of this object.
inherited

Operators

operator ==(Object other) → bool
The equality operator.
inherited