php - Empty post response ajax -


i'm trying use ajax geta response codeigniter controller method doesn't work ,the response it's empty.

    <script type="text/javascript">             $(document).ready(function(){                 $("#crear").click(function() {                     //$('#error_msg').html("error");                     $.ajax({                         type:"post",                         url:"clase/create",                         success:function(data){                             $('#error_msg').html(data);                         }                     });                 });             });     </script>

and controller

<?php if ( ! defined('basepath')) exit('no direct script access allowed');  class clase extends ci_controller {   function __construct()  {    parent::__construct();    $this->load->model('clase_model','',true);    $this->load->helper(array('form'));  }   function index()  {     if($this->session->userdata('logged_in')){         $data['title'] = 'gestión de clases';         $data['clases'] = $this->clase_model->getall();       $this->load->view('header', $data);       $this->load->view('clase_view', $data);       }      else{            redirect('login', 'refresh');      }  }   function create(){     if($this->session->userdata('logged_in')){       $this->load->library('form_validation');       $this->form_validation->set_rules('name', 'nombre', 'trim|min_length[2]|required');       $this->form_validation->set_rules('info', 'información', 'trim');         if($this->form_validation->run() == false){           $data = array(             'error_message1' => form_error('name'),             'error_message2' => form_error('info')             );            return $data['error_message1'];        }        else{           if($this->input->post('info')){              $this->insert2($this->input->post('name'),$this->input->post('info'));           }           else{             $this->insert1($this->input->post('name'));            }        }        }     else{           redirect('login', 'refresh');     }  }   function insert2($name,$information){     $dat = array(       'nombre'=>$name,       'info'=>$information     );     $this-> db ->insert('clase',$dat);      echo $name;     redirect('clase', 'refresh');  }  function insert1($name){     $dat = array(       'nombre'=>$name,     );      $this-> db ->insert('clase',$dat);     redirect('clase', 'refresh');  } } ?>

and response header

cache-control    no-store, no-cache, must-revalidate, post-check=0, pre-check=0 connection   keep-alive content-length   0 content-type     text/html; charset=utf-8 date     sat, 25 apr 2015 16:04:47 gmt expires  thu, 19 nov 1981 08:52:00 gmt keep-alive   timeout=5, max=100 pragma   no-cache server   apache/2.4.10 (win32) openssl/1.0.1i php/5.6.3 set-cookie   ci_session=941a601d7eaf9f590d21bd4c0aa8c2ac043faa81; expires=sat, 25-apr-2015 18:04:47 gmt; max-age=7200 ; path=/; httponly x-powered-by     php/5.6.3

somebody can tell me wrong?it's first time ajax

to response in ajax request in codeigniter should use-

echo json_encode('your data');

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