Listening for combinations of keys pressed using HostListener

Question

Listening for combinations of keys pressed using HostListener

I've been attempting to detect when a user presses the Shift+Tab key combination on the keyboard, but for some reason I can't get the event to trigger.

@HostListener('keyup', ['$event'])
@HostListener('keydown', ['$event'])

onkeyup(event) {
  if (event.keyCode == 16 && event.keyCode == 9) {
    this.isShift = true;
    console.log("On Keyup " + event.keyCode);
  }
}

onkeydown(event) {
  console.log("On KeyDown" + event.keyCode);
}

angular typescript

Answer 1

Answer №1

While Frank Modica's solution is effective, leveraging Angular's key event filtering and pseudo-events offers a more organized and streamlined approach:

@Directive({
    selector: '[keyHandler]'
})
export class KeyHandlerDirective {

    @HostListener('keydown.shift.tab', ['$event'])
    onKeyDown(e) {
        // You can use preventDefault() if necessary
        // e.preventDefault();
        console.log('shift and tab');
    }
}

// In the template:
<input type="text" keyHandler />

To explore further examples of how pseudo-events function, check out this resource.

Answer 2

While Frank Modica's solution is effective, leveraging Angular's key event filtering and pseudo-events offers a more organized and streamlined approach:

@Directive({
    selector: '[keyHandler]'
})
export class KeyHandlerDirective {

    @HostListener('keydown.shift.tab', ['$event'])
    onKeyDown(e) {
        // You can use preventDefault() if necessary
        // e.preventDefault();
        console.log('shift and tab');
    }
}

// In the template:
<input type="text" keyHandler />

To explore further examples of how pseudo-events function, check out this resource.

Answer 3

Answer №2

This solution is effective for handling the specified key event:

@Directive({
  selector: '[test-directive]'
})
export class TestDirective {
  @HostListener('keydown', ['$event']) onKeyDown(e) {
    if (e.shiftKey && e.keyCode == 9) {
      console.log('shift and tab');
    }
  }
}

<input type="text" test-directive />

Keep in mind that using the keyup event can be problematic as pressing the Tab key may cause the element to lose focus. As a result, the keyup event might trigger on a different element. Therefore, depending on your requirements, the use of keydown could be more suitable for handling events on the current element.

Answer 4

This solution is effective for handling the specified key event:

@Directive({
  selector: '[test-directive]'
})
export class TestDirective {
  @HostListener('keydown', ['$event']) onKeyDown(e) {
    if (e.shiftKey && e.keyCode == 9) {
      console.log('shift and tab');
    }
  }
}

<input type="text" test-directive />

Keep in mind that using the keyup event can be problematic as pressing the Tab key may cause the element to lose focus. As a result, the keyup event might trigger on a different element. Therefore, depending on your requirements, the use of keydown could be more suitable for handling events on the current element.

Listening for combinations of keys pressed using HostListener

Answer №1

Answer №2

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