title: Controller Function is not getting called on ng-click
body: <h2>This is my View Code</h2>
  
  <pre><code>&lt;div ng-controller="signupCtrl"&gt;
  &lt;ul class="list-group" &gt;
      &lt;li class="list-group-item"&gt;
          &lt;div class="form-group"&gt;
              &lt;input type="text" ng-model="signupCtrl.firstName"&gt;
          &lt;/div&gt;
      ...
          &lt;/div&gt;
  
  
          &lt;div class="form-group"&gt;
              &lt;div class="pull-right"&gt;
                  &lt;button ng-click="signupCtrl.signupUser()"&gt;Register&lt;/button&gt;
              &lt;/div&gt;
          &lt;/div&gt;
      &lt;/li&gt;
  &lt;/ul&gt;
  &lt;/div&gt;
  </code></pre>
  
  <h2>Update- This is my Controller Code ##</h2>
  
  <pre><code>someAppControllers.controller('signupCtrl', [
      '$window', 
      '$scope',     
      'HttpReqHandlerService',     
      '$location', 
      'localStorageService'],
      function($window, $scope, HttpReqHandlerService, 
               $location, localStorageService) { 
          $scope.signupUser=function signupUser() {
          alert("hello");
      }]);
  </code></pre>
  
  <p>The button is not calling signupUser function in my controller</p>