<p>Typing in the input box below updates the key count</p>
<input ng-keyup="count = count + 1" ng-init="count=0"> key up count: {{count}}

<p>Typing in the input box below updates the keycode</p>
<input ng-keyup="event=$event">
<p>event keyCode: {{ event.keyCode }}</p>
<p>event altKey: {{ event.altKey }}</p>