AfterViewChecked class abstract

Implement this interface to get notified after every check of your component's view.

Examples

Try this live example from the Lifecycle Hooks page:

template: '''
  <div>-- child view begins --</div>
    <my-child-view></my-child-view>
  <div>-- child view ends --</div>
  <p *ngIf="comment.isNotEmpty" class="comment">{{comment}}</p>''',

class AfterViewComponent implements AfterViewChecked, AfterViewInit {
  var _prevHero = '';

  // Query for a VIEW child of type `ChildViewComponent`
  @ViewChild(ChildViewComponent)
  ChildViewComponent viewChild;

  @override
  void ngAfterViewInit() {
    // viewChild is set after the view has been initialized
    _logIt('AfterViewInit');
    _doSomething();
  }

  @override
  void ngAfterViewChecked() {
    // viewChild is updated after the view has been checked
    if (_prevHero == viewChild.hero) {
      _logIt('AfterViewChecked (no change)');
    } else {
      _prevHero = viewChild.hero;
      _logIt('AfterViewChecked');
      _doSomething();
    }
  }
  // ...
}

Constructors

AfterViewChecked()

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

ngAfterViewChecked() → 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