Get which key pressed from (keypress) angular2

Pass $event to your event handler. The $event is a DOM KeyboardEvent.

<input type=text (keypress)="eventHandler($event)">

eventHandler(event) {
   console.log(event, event.keyCode, event.keyIdentifier);
} 

If you know which KeyboardEvent property you want, you can pass that into your event handler:

<input type=text (keypress)="eventHandler($event.keyCode)">

eventHandler(keyCode) {...}