javascript - AngularJS keypress event listener - NOT INPUT ELEMENT -

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i trying create div responds keypress events, arrow , down arrow. when div open, want window/document respond specific keypress events. i've seen jquery solutions, i'd rather not use jquery. what's best way accomplish this?

specifically, have different audio volume images , want these images change each keypress.

    $scope.keypress = function($event) {      $scope.key = $event.keycode      };

you can write in div ng-keydown="keypress($event)" codepen url reference-http://codepen.io/nagasai/pen/beeqre

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