Angular 4, How to update [(ngModel)] with a delay of 1 seconds

Question

Since ngModel is updating instantly how to put a delay.

Answer 1

Answer by Fredrik Lundin updated for Angular 6:

Template:

Component:

import ......

import { Subject, EMPTY } from 'rxjs';
import { debounceTime, distinctUntilChanged, switchMap } from 'rxjs/operators';

@Component{(
  ...
)}
export class YourComponent implements OnDestroy {

  term$ = new Subject();

  private searchSubscription: Subscription;

  constructor() {
    this.searchSubscription = this.term$.pipe(
      debounceTime(1000),
      distinctUntilChanged(),
      switchMap(term => {
        /*do something*/
        return EMPTY;
      })
    ).subscribe();
  }

  ngOnDestroy() {
    //remember to unsubscribe on destroy

    if (this.searchSubscription) {
      this.searchSubscription.unsubscribe();
      this.searchSubscription = null;
    }
  }
}