rx-throttle directive for angular.js

gistfile1.js

directive('ngThrottle', function () {
  return {
    restrict: 'A',
    require: 'ngModel',
    link: function (scope, elm, attr, ngModelCtrl) {
      if (attr.type === 'radio' || attr.type === 'checkbox') return;
      elm.unbind('input').unbind('keydown').unbind('change');
      var disp = elm.keyupAsObservable().
        throttle(attr.ngThrottle).
        select(function(){ return elm.val() }).
        subscribe(function (x) {
          scope.$apply(function () { ngModelCtrl.$setViewValue(x) })
        });
      elm.bind('$destroy', disp.dispose);
    }
  }
});