OnEnter.js

myApp.directive('onEnter', function() {
  return function($scope, element, attrs) {
    element.bind('keydown keypress', function(e) {
      if (e.which === 13) {
        $scope.$apply(function() {
          $scope.$eval(attrs.onEnter);
        });
        e.preventDefault();
      }
    });
  };
});