markForCheck

Marks all ChangeDetectionStrategy#OnPush ancestors as to be checked.

<!-- TODO: Add a link to a chapter on OnPush components -->

Example

@Component(
    selector: 'cmp',
    changeDetection: ChangeDetectionStrategy.OnPush,
    template: 'Number of ticks: {{numberOfTicks}}')
class Cmp {
  int numberOfTicks = 0;
 
  Cmp(ChangeDetectorRef ref) {
    new Timer.periodic(const Duration(seconds: 1), () {
      numberOfTicks++;
      // the following is required, otherwise the view will not be updated
      ref.markForCheck();
    });
  }
}
 
@Component(
    selector: 'app',
    changeDetection: ChangeDetectionStrategy.OnPush,
    template: '''
        <cmp><cmp>
      ''',
    directives: const [Cmp])
class App {}
 
void main() {
  bootstrap(App);
}