Codeigniter Php自动完成

I am trying to achieve autocomplete search and I added all necessary jQuery but it still doesn't work.

Here is my View :

<script type="text/javascript">
$(document).ready(function(){
   $('#dseancename').autocomplete({
       source:"<?php echo site_url('AddSeance/search/?'); ?>"

   });
});

And my Controller:

function search() {
  $this->load->model('SalonModel');
if(isset($_GET['term'])){
$result = $this->SalonModel->search($_GET['term']);
if(count($result) >0){
    foreach ($result as $pr)
        $arr_result[] = $pr->name;
    echo json_encode($arr_result);
        }
}}

And my Model :

 function search($name) {

    $this->db->like('name',$name,'both');
    return $this->db->get('seance')->result();//table name seance
}

I tried to make it an array and it works. But I can't make it with database values. I searched on the internet and find someone who already did it but it doesn't work to.