Identify when the user ceases typing in Angular 2

Question

Identify when the user ceases typing in Angular 2

I am currently working on implementing a feature that detects whether the user is typing or not. I need to determine when the user has stopped typing for at least 3 seconds in order to perform certain actions. I have successfully detected when the user starts typing using the following code snippet:

     ngOnChanges(searchValue: string) {
    if (!this.searchChangeObserver) {
      Observable.create(observer => {
        this.searchChangeObserver = observer;
      }).debounceTime(3000) 
        .subscribe((data) => {
          if (data) {
            typingStuff();
          }
          else {
            notTypingStuff();
          }
        });
      this.searchChangeObserver.next(searchValue);
    }
  }
}

Now, I need to find a way to detect when the user stops typing so that I can execute the notTypingStuff() function.

Is there a simpler method to achieve this?

EDIT

In addition to the above code snippet, I am also utilizing the following code:

constructor(){
    this.modelChanged
      .debounceTime(300)
      .subscribe((data) => {
        if (data) {
          typingStuff();
        }
        else {
          notTypingStuff();
        }
      });
}

However, I still need to determine when the user stops typing for 3 seconds to trigger the notTypingStuff() function as well.

angular typescript

Answer 1

Answer №1

To avoid executing code while typing, you can set up an observable that triggers on input events with a debounce time:

HTML:

<input #yourElement [(ngModel)]="yourVar"/>

Component:

@ViewChild('yourElement') yourElement: ElementRef;

ngAfterViewInit() {
    Observable.fromEvent(this.yourElement.nativeElement, 'input')
        .map((event: Event) => (<HTMLInputElement>event.target).value)
        .debounceTime(3000)
        .distinctUntilChanged()
        .subscribe(data => notTypingStuff());
}

This setup ensures that the method is only called after 3000ms of inactivity following a modification in the input field, essentially when the user stops typing.

EDIT: Angular 9 w/ RxJS 6.5.4

ngAfterViewInit(): void {
    fromEvent(this.yourElement.nativeElement, 'input')
      .pipe(map((event: Event) => (event.target as HTMLInputElement).value))
      .pipe(debounceTime(3000))
      .pipe(distinctUntilChanged())
      .subscribe(data => notTypingStuff());
  }

Answer 2

To avoid executing code while typing, you can set up an observable that triggers on input events with a debounce time:

HTML:

<input #yourElement [(ngModel)]="yourVar"/>

Component:

@ViewChild('yourElement') yourElement: ElementRef;

ngAfterViewInit() {
    Observable.fromEvent(this.yourElement.nativeElement, 'input')
        .map((event: Event) => (<HTMLInputElement>event.target).value)
        .debounceTime(3000)
        .distinctUntilChanged()
        .subscribe(data => notTypingStuff());
}

This setup ensures that the method is only called after 3000ms of inactivity following a modification in the input field, essentially when the user stops typing.

EDIT: Angular 9 w/ RxJS 6.5.4

ngAfterViewInit(): void {
    fromEvent(this.yourElement.nativeElement, 'input')
      .pipe(map((event: Event) => (event.target as HTMLInputElement).value))
      .pipe(debounceTime(3000))
      .pipe(distinctUntilChanged())
      .subscribe(data => notTypingStuff());
  }

Answer 3

Answer №2

Angular 6 is the version.

The HTML code snippet:

<input matInput type="text" (keyup)="searchInterest()" [(ngModel)]="keyword" [matAutocomplete]="auto">

This is the component:

public searchInterest() {
    let wordSearch = this.keyword;
    setTimeout(() => {
        if (wordSearch == this.keyword) {
            if (this.keyword) {
                //function that will return your list of objects
            }else{
                //implement code here
            }
        }
    }, 2000);
}

Answer 4

Angular 6 is the version.

The HTML code snippet:

<input matInput type="text" (keyup)="searchInterest()" [(ngModel)]="keyword" [matAutocomplete]="auto">

This is the component:

public searchInterest() {
    let wordSearch = this.keyword;
    setTimeout(() => {
        if (wordSearch == this.keyword) {
            if (this.keyword) {
                //function that will return your list of objects
            }else{
                //implement code here
            }
        }
    }, 2000);
}

Answer 5

Answer №3

Whenever a user types in the element, I will capture the (keyup) event and verify if the time elapsed since the event was triggered is equal to or greater than 3 seconds.

Answer 6

Whenever a user types in the element, I will capture the (keyup) event and verify if the time elapsed since the event was triggered is equal to or greater than 3 seconds.

Answer 7

Answer №4

I believe this approach could also be effective.

SCRIPT.ts

doSomething: any = null;
isActive: boolean = false;

trackActivity(event){

    this.isActive = true;

    clearTimeout(this.doSomething);

    this.doSomething = setTimeout( () => {
        this.isActive = false;
    }, 3000);

}

SCRIPT.HTML

<input (keyup)="trackActivity($event)">

Answer 8

I believe this approach could also be effective.

SCRIPT.ts

doSomething: any = null;
isActive: boolean = false;

trackActivity(event){

    this.isActive = true;

    clearTimeout(this.doSomething);

    this.doSomething = setTimeout( () => {
        this.isActive = false;
    }, 3000);

}

SCRIPT.HTML

<input (keyup)="trackActivity($event)">

Identify when the user ceases typing in Angular 2

Answer №1

Answer №2

Answer №3

Answer №4

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