How to Implement Debouncing in Angular 2 ?

Angular 2 Debouncing

Debouncing is a technique used in programming to delay the execution of a task until a specified period of time has elapsed since the most recent call to that task. In Angular, debouncing can be used to improve the performance of your applications by reducing the number of times your application performs expensive operations.

In AngularJS, debouncing was handled using the ng-model-options directive. However, in Angular 2 , there is no built-in debounce function. Instead, you can use the RxJS debounceTime() operator on the valueChanges observable of a form control.

Here's an example of how to debounce a form control in Angular 2 :

<code class="typescript">import {Component}   from '@angular/core';
import {FormControl} from '@angular/forms';
import {Observable}  from 'rxjs/Observable';
import 'rxjs/add/operator/debounceTime';

@Component({
  selector: 'my-app',
  template: `<input type=text [value]="firstName" [formControl]="firstNameControl">
    <br>{{firstName}}`
})
export class AppComponent {
  firstName        = 'Name';
  firstNameControl = new FormControl();

  ngOnInit() {
    this.firstNameControl.valueChanges
      .debounceTime(1000)
      .subscribe(newValue => this.firstName = newValue);
  }
}</code>

In this example, we first create a new FormControl named firstNameControl. Then, we subscribe to the valueChanges observable of the form control. We use the debounceTime() operator to delay the execution of the callback function until 1000 milliseconds have elapsed since the last time the input value changed.

The debounceTime() operator is just one of many RxJS operators that can be used to manipulate and filter observables. For more information on RxJS operators, please refer to the RxJS documentation.

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