AngularJS: directive to auto focus input field when ng-show is triggered

show-focus

app.directive('showFocus', function($timeout) {
  return function(scope, element, attrs) {
    scope.$watch(attrs.showFocus, 
      function (newValue) { 
        $timeout(function() {
            newValue && element.focus();
        });
      },true);
  };    
});

Usage: <input type="text" ng-show="customcondition" show-focus="customcondition">

You would want to leave the third parameter out of the $watch function as setting it as 'true' will cause unnecessary deep object tree comparison. Find more info here

What License can this be used under? I would assume the MIT license but some sort of header or confirmation would be nice.
Thanks.