Managing Input Events in Angular 2
In AngularJS, developers could utilize the ng-model-options directive to debounce input model updates. In Angular 2 , a similar functionality is available through the use of RxJS operators.
Debouncing with RxJS
To debounce a model in Angular 2 , leverage the debounceTime() operator on the form control's valueChanges observable. This operator delays subsequent value emissions until the specified time elapses after the last event.
<br>import { debounceTime } from 'rxjs/operators';</p>
<p>formCtrlSub = this.firstNameControl.valueChanges</p>
<pre class="brush:php;toolbar:false">.pipe(
debounceTime(1000)
)
.subscribe(newValue => this.firstName = newValue);
Throttling Events
You can also throttle events, such as resize events, to prevent excessive updates. The throttleTime() operator ensures that only one value is emitted within the specified time window.
<br>import { throttleTime } from 'rxjs/operators';</p>
<p>resizeSub = Observable.fromEvent(window, 'resize')</p>
<pre class="brush:php;toolbar:false">.pipe(
throttleTime(200)
)
.subscribe(e => {
console.log('resize event', e);
this.firstName += '*'; // change something to show it worked
});
Efficient Event Handling
The above approaches trigger change detection on every event, even when they are debounced or throttled. For more efficient event handling, consider creating RxJS Observables outside of Angular's zone, manually triggering change detection in subscribe callback methods.
<br>ngAfterViewInit() {</p>
<pre class="brush:php;toolbar:false">this.ngZone.runOutsideAngular(() => {
this.keyupSub = Observable.fromEvent(this.inputElRef.nativeElement, 'keyup')
...
this.resizeSub = Observable.fromEvent(window, 'resize')
...
});
}
By utilizing RxJS operators and proactive change detection trigger, you can effectively manage input events in Angular 2 , ensuring smooth and responsive user interactions.
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