Ajax-вызов Datatables в модуле codeigniter (HMVC)

Недавно я разрабатывал простое php-приложение для небольшой компании, пытался использовать кодовый указатель HMVC (расширение MX) и пробовал первый вызов ajax в представлении для таблиц данных, но он не показывает данных. Уже проверил, что функция в контроллере и БД работают, и я получаю var_dump с данными. Вот мои файлы:
МОДУЛЬ МОДЕЛЬ

класс Mdl_categorie extends CI_Model {

var $table ='categorie';
var $column_order = array('ID_anag_type', 'descr'); //set column field database for datatable orderable
var $column_search = array('descr'); //set column field database for datatable searchable just firstname , lastname , address are searchable
var $order = array('ID_anag_type' => 'desc'); // default order

function __construct()
{
parent::__construct();
}

private function _get_datatables_query()
{
$this->db->from($this->table);
$i = 0;

foreach ($this->column_search as $item) // loop column
{
if($_POST['search']['value']) // if datatable send POST for search
{

if($i===0) // first loop
{
$this->db->group_start(); // open bracket. query Where with OR clause better with bracket. because maybe can combine with other WHERE with AND.
$this->db->like($item, $_POST['search']['value']);
}
else
{
$this->db->or_like($item, $_POST['search']['value']);
}

if(count($this->column_search) - 1 == $i) //last loop
$this->db->group_end(); //close bracket
}
$i++;
}


if(isset($_POST['order'])) // here order processing
{
$this->db->order_by($this->column_order[$_POST['order']['0']['column']], $_POST['order']['0']['dir']);
}
else if(isset($this->order))
{
$order = $this->order;
$this->db->order_by(key($order), $order[key($order)]);
}

}

function get_datatables()
{

$this->_get_datatables_query();
if($_POST['length'] != -1)
$this->db->limit($_POST['length'], $_POST['start']);
$query = $this->db->get();
return $query->result();
}

function count_filtered()
{
$this->_get_datatables_query();
$query = $this->db->get();
return $query->num_rows();
}

public function count_all()
{
$this->db->from($this->table);
return $this->db->count_all_results();
}
}

МОДУЛЬ КОНТРОЛЛЕР

<?php

определено (‘BASEPATH’) ИЛИ exit (‘Прямой доступ к сценарию запрещен’);

класс Anagrafiche расширяет MX_Controller {

function __construct()
{
parent::__construct();
$this->load->model('anagrafiche/mdl_categorie','mdl_categorie');
}

public function main (){
$data['module']= 'anagrafiche';
$data['view_file']='main';
$data['_pg_title']='Anagrafiche';
$data['_descr_title']='Tabelle riassuntive anagrfiche clienti/fornitori/vettori/...';
echo Modules::run('template/operator_layout', $data);
}

public function categorie (){
$data['module']= 'anagrafiche';
$data['view_file']='categorie';
$data['_pg_title']='Anagrafiche';
$data['_descr_title']='Tipi di anagrafiche';
echo Modules::run('template/operator_layout', $data);
}

public function ajax_categorie_list(){
$list = $this->mdl_categorie->get_datatables();
$data = array();
$no = $_POST['start'];
foreach ($list as $categoria) {
$no++;
$row = array();
$row[] = $categoria->ID_anag_type;
$row[] = $categoria->descr;
$data[] = $row;
}

$output = array(
"draw" => $_POST['draw'],
"recordsTotal" => $this->mdl_categorie->count_all(),
"recordsFiltered" => $this->mdl_categorie->count_filtered(),
"data" => $data,
);
//output to json format
echo json_encode($output);
}
}

ФАЙЛ С ВИДОМ МОДУЛЯ

<section class="content">
<div class="row">
<div class="col-xs-12">
<div class="box">
<div class="box-header">
<h3 class="box-title"></h3>
<div class="box-body">
<div class="nav-tabs-custom">
<ul class="nav nav-tabs">
<li class="active"><a href="#tab_1" data-toggle="tab"><i class="fa fa-list"></i> Elenco</a></li>
<li><a href="#tab_2" data-toggle="tab"><i class="fa fa-plus"></i> Aggiungi</a></li>
<li><a href="#tab_3" data-toggle="tab">Tab 3</a></li>
</ul>
<div class="tab-content">
<div class="tab-pane active" id="tab_1">
<table id="anag_categorie" class="table table-bordered table-striped">
<thead>
<tr>
<th>ID Catgeoria</th>
<th>Nome Categoria</th>

</tr>
</thead>
<tbody>


</tbody>
</table>
<script type="text/javascript">
$(document).ready(function(){
$('#anag_categorie').DataTable( {
"processing": true,
"serverSide": true,
"ajax": {
"url": "http://sviluppoweb/campanini/anagrafiche/categorie/ajax_categorie_list",
"type": "POST"},);

var versionNo = $.fn.dataTable.version;
alert(versionNo);
});

</script>

<!--
<script type="text/javascript" src="<?php echo base_url('application/modules/anagrafiche/views/js/categorie.js')?>"></script>
//-->
</div>
<!-- /.tab-pane -->
<div class="tab-pane" id="tab_2">
The European languages are members of the same family. Their separate existence is a myth.
For science, music, sport, etc, Europe uses the same vocabulary. The languages only differ
in their grammar, their pronunciation and their most common words. Everyone realizes why a
new common language would be desirable: one could refuse to pay expensive translators. To
achieve this, it would be necessary to have uniform grammar, pronunciation and more common
words. If several languages coalesce, the grammar of the resulting language is more simple
and regular than that of the individual languages.
</div>
<!-- /.tab-pane -->
<div class="tab-pane" id="tab_3">
Lorem Ipsum is simply dummy text of the printing and typesetting industry.
Lorem Ipsum has been the industry's standard dummy text ever since the 1500s,
when an unknown printer took a galley of type and scrambled it to make a type specimen book.
It has survived not only five centuries, but also the leap into electronic typesetting,
remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset
sheets containing Lorem Ipsum passages, and more recently with desktop publishing software
like Aldus PageMaker including versions of Lorem Ipsum.
</div>
<!-- /.tab-pane -->
</div>
<!-- /.tab-content -->
</div>
<!-- nav-tabs-custom -->
</div>
<!-- /.col -->

</div>
</div>
<!-- /.box-body -->
</div>
<!-- /.box -->
</div>
<!-- /.col -->
</div>
<!-- /.row -->
</section>
<!-- /.content -->