Angular2, HostListener, how can I target an element? can I target based on class?

Since the accepted answer doesn't actually help to solve the problem, here is a solution.

A better way to achieve this is by creating a directive, this way you can add the directive to any element you wish, and the listeners will only trigger for this particular element.

For example:

@Directive({
   selector: "[focus-out-directive]"
})
export class FocusOutDirective {
   @Output() onFocusOut: EventEmitter<boolean> = new EventEmitter<false>();

   @HostListener("focusout", ["$event"])
   public onListenerTriggered(event: any): void {
       this.onFocusOut.emit(true);
   }
}

Then on your HTML elements you wish to apply this listener to, just add the directive selector, in this case focus-out-directive, and then supply the function you wish to trigger on your component.

Example:

<input type='text' focus-out-directive (onFocusOut)='myFunction($event)'/>

@HostListener() only supports window, document, and body as global event targets, otherwise it only supports the components host element.

I think better way for global listener is @hostliterner but if you want to target some element you can do like this

<div (event)="onEvent($e)"></div>

in your angular component

onEvent($e) { //do something ... }