php - JSON Parse error - iPad/iPhone Only -

i working within codeigniter framework , on page load making following ajax request:

$.ajax({         url: '/beta/images/loadimages',         type: 'post',         datatype: 'json',         data: {id: id},         success: function(json, textstatus, xhr) {             alert('success');                }         }, error: function(json, textstatus, errorthrown) {             alert(errorthrown);         }     }); 

strong text

public function loadimages()     {         $galleryid = $this->input->post('id');          $data      = array('images' => $this->image_gallery->get_slideimages($galleryid) );          echo json_encode($data);     } 

finally model

public function get_slideimages($galleryid)     {         $this->db->select('id');         $this->db->where('galleryid', $id);          $query = $this->db->get('image_images');          $result = $query->result();         return $result;     } 

json return in chrome

{"images":[{"id":"34","galleryid":"57","clientref":"205","imagename":"769074051374530545.jpg","orgname":"p9180021.jpg","order":"0","timestamp":"1374530546"}]} 

the error occurs on ipad , iphone. syntaxerror: json parse error: unrecognized token '<' ideas on one?

url: '/beta/images/loadimages', type: 'post' 

if loading (especially on page load), why use post? use get instead.

you getting json parse error because aren't returning valid json (you returning html/xml). possible explanation have server side logic dictates

if browser == mobile       return html/xml            else       return json