refresh/update div with ajax

Ok, so I have a model called room and a roomController. I also have a room view folder with the following view files

  • login

  • room

  • moderatorRoom

when users login using the login view, the login action in the roomController is called and they are redirected to one of the 2 rooms, room OR moderatorRoom. In both these view files a list of all users in that room is displayed. Below is the code for the div displaying all users in the room.


<div id=logged_in_users_list> 

          <p id="userList">  

            <?php  

              if(isset($allUsers))

              {

                foreach($allUsers as $person_in_the_room) 

                {                            

                     if($person_in_the_room->has_voted==0)

                     {

                       echo $person_in_the_room->username.'<br/>';  

                     }

                     else

                     { 

                        if(isset($poll))

                        {

                           if($poll->before_settings == 'Voter only')

                           {

                             echo $person_in_the_room->username.' '.'<br/>'; // code here for adding vote result beside their name                                 

                           }

                           else

                           {                                 

                             echo $person_in_the_room->username.' '.CHtml::image(Yii::app()->request->baseUrl.'\images\icon_tick_green.gif').'<br/>';

                           }

                        }

                     }                                                  

                 }        

              }

            ?>

          </p>

		

	</div>

What I’d like to know how to do is, how could I write an ajax function to update/refresh this div every time a user logs in? I’m new to yii and php, and even newer to javascript so help is both greatly needed and appreciated. If someone was kind enough a simple code example snippet would be amazing!