title: Get old value and new value from dropdown
body: <p>I'm trying to simply get the previous value, and the newly selected value from a drop-down.  In this example, the drop-down is pre-populated with the current group the user is assigned. </p>
  
  <p>When the drop-down is changed, I want to be able to return the old value and the new value. I can already get the old value, but I don't know how to return the new value.</p>
  
  <p><strong>Controller Code:</strong></p>
  
  <pre><code>// User Object
  userAccess = [{"user_name":"dodsosr11",
                    "group_level":1,
                    "user_id":500,
                    "group_id":10,
                    "group_name":"Conferences_Admins"},
                {"user_name":"keatikj09",
                    "group_level":1,
                    "user_id":250,
                    "group_id":10,
                    "group_name":"Conferences_Admins"},
                {"user_name":"malinag10",
                    "group_level":1,
                    "user_id":492,
                    "group_id":10,
                    "group_name":"Conferences_Admins"}];
  
  //Group Object
  groupAccess = [{"group_name":"Conferences_Admins",
                     "id":10,
                     "level_id":1},
                 {"group_name":"ticket_sales",
                     "id":59,
                     "level_id":3},
                 {"group_name":"Web Developers",
                     "id":1,
                     "level_id":1}];
  
  
  $scope.reassignUser = function(){
      var oldGroup = this.user.group_id;
      var newGroup = ?????
  
  };
  </code></pre>
  
  <p>HTML:</p>
  
  <pre><code>&lt;tr ng-repeat="user in userAccess"&gt;
      &lt;td&gt;{{ user.user_name}}&lt;/td&gt;
      &lt;td&gt;
          &lt;select ng-change="reassignUser()" 
                  ng-model="user.group_name" 
                  ng-options="g.group_name as g.group_name for g in groupAccess"&gt;
          &lt;/select&gt;
      &lt;/td&gt;
  &lt;/tr&gt;
  </code></pre>
  
  <p>I've created a fiddle here using the watch example that was provided in the first response below.   <a href="http://jsfiddle.net/LHz9D/1/" rel="noreferrer">http://jsfiddle.net/LHz9D/1/</a></p>