title: Can't get data from a codeigniter function with ajax
body: <p>This is what I've got so far:</p>
  
  <p>This function that returns data from the model:</p>
  
  <pre><code>function get_user2()
  {
      $this-&gt;load-&gt;model('my_model');
      $id=$this-&gt;input-&gt;post('users1');
      $users2=$this-&gt;my_model-&gt;get_relations($id);
      return $users2;
  }   
  </code></pre>
  
  <p>the model function:</p>
  
  <pre><code>function get_relations($usr)
  {
          $this-&gt;db-&gt;where('id',$usr);
          $rel=$this-&gt;db-&gt;get('relacion');
  
      if($rel-&gt;num_rows!=0)
      {
          $relacion=array();
          foreach ($rel-&gt;result_array() as $row) 
          {
              $relacion[]=array(
                              'id'=&gt;$row['id'],
                              'username1'=&gt;$row['username1'],
                              'username2'=&gt;$row['username2'],
                          );
          }
          return $relacion;
      }else{
          return false;
      }
  }
  </code></pre>
  
  <p>and in my view:</p>
  
  <pre><code>&lt;select name="users1" id="drop1"&gt;
  &lt;?php
      if($opciones!=false){
          foreach ($opciones as $row) {
              echo '&lt;option value="'.$row['user_id'].'"&gt;'.$row['username'].'&lt;/option&gt;';
          }
  
      }
  ?&gt;
  &lt;/select&gt;
  &lt;script src="jquery.js"&gt;&lt;/script&gt;
  &lt;script type="text/javascript"&gt;
  $("#drop1").change(function(){
      $.ajax({
                  type: "POST",
                  url: "example.com/CI/index.php/evaluation/get_user2",
                  data: "users1="+$('#drop1').val(),
                  success: function(){
                      alert('it works!');
                  }
              });
  });
  &lt;/script&gt;
  </code></pre>
  
  <p>I want to fill a second dropdown with the options returned by the controller function, but the ajax request doesn't do anything so I haven't even got to that part. Can someone help me spot what's wrong? I already tested the controller and model's function and they work. And could you tell me how to fill the second dropdown's options?
  Thank you very much!</p>