CODEWITHSUNDEEP
typescriptdebouncingngxs
Maks K
Maks K

Reputation: 3914

How to implement Debounce analog for ngxs action?

I have search input:

<input type="text" (ngModelChange)="projectFilter()">

When user is typing It will call projectFilter function after every model change.

How can I implement Debounce with ngxs?

for example dispatch actions only after 0.5 sec after user finish typing?

  projectFilter() {
      this.store.dispatch([
        new SomeAction()
      );
    });
  }

Upvotes: 1

Views: 1000

Answers (1)

kctang
kctang

Reputation: 11192

One way to do this would be to create an observable chain using a BehaviorSubject that dispatches the action with debounceTime().

// somewhere in your component class
projectFilter$ = new BehaviorSubject<string>('')

projectFilter() {
  // set next value instead of dispatching
  this.projectFilter$.next('current value')
}

ngOnInit() {
    // debounce whenever a new value is available with debounce
    this.projectFilter$.pipe(
      debounceTime(1000),
      tap(() => {
        this.store.dispatch(new MyAction())
      })
    ).subscribe()
}

Note: Code not tested. Just use it to understand the concept & implement accordingly.

Alternatively, you might want to use reactive forms. With that, you get things like valueChanges as an observable for free.

Hope this helps.

Upvotes: 3

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