title: Call Angular-function upon $scope-variable change
body: <p>I am new to AngularJS and trying to set up a function that gets called upon whenever a variable is changed. </p>
  
  <p>Currently I have a dropdown-menu, with ng-model bound to a $scope.userRating. And I am trying to get a function that gets called immediately when the user changes the value using the dropdown.</p>
  
  <p>I have been looking at $watch, but not quite sure on how to get it to work. I also tried to make a ng-click function on the  in the html, but ng-clicks don't seem to trigger.</p>