Call a scope method when a certain key is pressed

onAction.js

app.directive('onAction', function() {
    return {
        priority: 1,
        link: function(scope, elem, attrs) {
            var keyMap = {
                    'enter': 13,
                    'space': 32
                    // add more keycodes from here: http://www.cambiaresearch.com/articles/15/javascript-char-codes-key-codes
                },
                keyCode = keyMap[attrs.actionKey];

            elem.bind('keypress', function(e) {
                if (e.keyCode === keyCode) {
                    e.preventDefault();
                    scope.$apply(attrs.onAction);
                }
            });
        }
    }
});

/*
*  Usage:
*
*  <input on-action="submit()" action-key="enter" />
*
*/