discontinuedPackage angular has been discontinued and replaced by ngdart.

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 setterinherited
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited

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