function listAll($offset = 0, $limit = 20)
{
$levels = new Level();
$levels->order_by('position');
$searchKey = "";
if ($_SERVER['METHOD_REQUEST'] == 'GET') {
} else {
$searchKey = $this->input->post("search_name");
$levels->distinct();
$levels->group_start();
$levels->like('name_vietnamese', $searchKey);
$levels->group_end();
}
$levels->get_paged($offset, $limit, TRUE);
setPagination($this->admin . 'levels/listAll/', $levels->paged->total_rows, $limit, 4);
$dis['base_url'] = base_url();
$dis['view'] = 'level/list';
$dis['levels'] = $levels;
$dis['searchKey'] = $searchKey;
$dis['menu_active'] = "Trình độ";
$dis['title_table'] = "Trang hiện tại:" . $levels->paged->current_page . '/' . $levels->paged->total_pages;
$dis['title'] = "Danh sách levels";
$dis['nav_menu'] = array(array("type" => "add", "text" => "Thêm level", "link" => "{$this->admin_url}levels/edit/0", "onclick" => ""));
$this->viewadmin($dis);
}