AfterContentChecked class abstract

Implement this interface to get notified after every check of your directive's content.

Examples

Try this live example from the Lifecycle Hooks page:

template: '''
  <div>-- projected content begins --</div>
    <ng-content></ng-content>
  <div>-- projected content ends --</div>
  <p *ngIf="comment.isNotEmpty" class="comment">{{comment}}</p>
  ''',

class AfterContentComponent implements AfterContentChecked, AfterContentInit {
  String _prevHero = '';
  String comment = '';

  // Query for a CONTENT child of type `ChildComponent`
  @ContentChild(ChildComponent)
  ChildComponent contentChild;

  @override
  void ngAfterContentInit() {
    // contentChild is set after the content has been initialized
    _logIt('AfterContentInit');
    _doSomething();
  }

  @override
  void ngAfterContentChecked() {
    // contentChild is updated after the content has been checked
    if (_prevHero == contentChild?.hero) {
      _logIt('AfterContentChecked (no change)');
    } else {
      _prevHero = contentChild?.hero;
      _logIt('AfterContentChecked');
      _doSomething();
    }
  }

  // ...
}

Constructors

AfterContentChecked()

Properties

hashCode → int

The hash code for this object.

no setter, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

ngAfterContentChecked() → void

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