Bagaimana membuat select (combo box) dinamis dengan AJAX pada swarakalibata_ci ?

Assalam, hampir sama mas dengan yang native, berikut kita contohkan pada swarakalibata ci :
<script type="text/javascript">
      $(document).ready(function(){
        $('#os').change(function(){
          var os_id = $(this).val();
          $.ajax({
            type:"POST",
            url:"<?php echo site_url('administrator/list'); ?>",
            data:"count_id="+os_id,
            success: function(response){
              $('#list').html(response);
            }
          })
        })
</script>
 
// Controller 
function os{
	$data['kategori_os'] = $this->model_app->view('kategori_os');
	$this->template->load('administrator/template','administrator/mod_os/view_os',$data);
}
 
function list(){
	$list_id = $this->input->post('count_id');
	$data['tampil'] = $this->model_app->view_where_ordering('mu_os',array('id_os' => $list_id),'id_os','DESC');
	$this->load->view('administrator/mod_os/view_os_list',$data);
}
 
 
// Views (view_os.php)
<tr><th scope='row'>Kategori OS</th> <td><select class='form-control' name='n' id='os' required>
                                   <option value=''>- Pilih -</option>";
                                     foreach ($kategori_os as $rows) {
                                        echo "<option value='$rows[id_kategori_os]'>$rows[nama_kategori]</option>";
                                     }
                              echo "</select></td></tr>
<tr><th scope='row'>Nama OS</th> <td><select class='form-control' name='m' id='list' required>
                                      <option value=''>- Pilih -</option>
                                    </select></td></tr>
 
 
// Views (view_os_list.php)
  echo "<option value=''>- Pilih -</option>";
  foreach ($tampil as $row){
      echo "<option value='$row[id_os]'>$row[nama_os]</option>";
  }