Link function conditional statement (Example) | Treehouse Community Check out our new React Components course! Home Free Trial Sign In Techdegree Tracks Library Community Support Jobs Welcome to the Treehouse Community The Treehouse Community is a meeting place for developers, designers, and programmers of all backgrounds and skill levels to get support. Collaborate here on code errors or bugs that you need feedback on, or asking for an extra set of eyes on your latest project. Join thousands of Treehouse students and alumni in the community today. (Note: Only Treehouse students can comment or ask questions, but non-students are welcome to browse our conversations.) Looking to learn something new? Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today. View Challenge JavaScript AngularJS Extending Inputs Extending Inputs: Optional require derekdekalb 15,072 Points Posted December 15, 2014 5:52am by derekdekalb derekdekalb 15,072 Points Link function conditional statement I don't understand why this isn't working.... Help is very much appreciated. Thanks in advance. app.js angular.module('treehouseCourse', [])   .directive('sometimesTwoWay', function() {     return {       // YOUR CODE HERE       require: '?ngModel',        link: function($scope, $element, $attrs, ngModelCtrl){         var isInitialized = false;         $attrs.$observe('ng-model', function (newValue) {           if (newValue) {             console.log('my model', ngModelCtrl);           }         });       }     }   }); index.html <!DOCTYPE html> <html ng-app="treehouseCourse"> <head>   <title>Angular.js</title>   <script src="js/angular.js"></script>   <script src="app.js"></script> </head> <body>