php - set query string in admin login panel in codeignitor -

i have created admin login panel. here model, view, controller file. if login unsuccessful, want sent querystring. after fetching querystring value want set message

incorrect email/password.

i think have modify in catalog_model.php or else??

my controller(d:\wamp\www\codeigniter\application\controllers\admin\catalog.php)

class catalog extends ci_controller {  public function __construct() {     parent::__construct();     $this->load->library('session');     $this->load->model('catalog_model'); }  function index() {        $this->load->helper(array('form', 'url'));     $this->load->library('form_validation');     $this->load->view('admin/templates/header');     $this->form_validation->set_error_delimiters('<div class="error_admin">', '</div>');     $this->load->database();     $this->form_validation->set_rules('email', 'email', 'required|valid_email');     $this->form_validation->set_rules('password', 'password', 'required');     if ($this->form_validation->run() == false)     {         $this->load->view('admin/catalog/catalog_view');     }     else     {            $this->catalog_model->admin_login();     }     $this->load->view('admin/templates/footer');     //$html_string = $this->load->view('admin/catalog/catalog_view'); }  function logout() {     $this->session->unset_userdata('admin_login');      $this->session->unset_userdata('admin_email');     //print_r($this->session->all_userdata());     $this->load->view('admin/catalog/catalog_view'); } 

}

my model(d:\wamp\www\codeigniter\application\models\cataalog_model)

<?php class catalog_model extends ci_model {      public function __construct()     {         $this->load->database();     }      public function admin_login()    {         $data = array(         'email' => $this->input->post('email'),         'password' => $this->input->post('password'),         );         //return $this->db->insert('school_registration', $data);         $query = $this->db->get_where('admin', $data);         $rowcount = $query->num_rows();         if($rowcount==1)         {         $this->session->set_userdata('admin_login', 'true');         $this->session->set_userdata('admin_email', $this->input->post('email'));         $this->load->view('admin/catalog/home_view');         }         else         {             $this->load->view('admin/catalog/catalog_view');             //parse_str($_server['query_string'],$_get);         }    } } 

my view(d:\wamp\www\codeigniter\application\views\admin\catalog\catalog_view.php)

<?php if (!defined('basepath')) exit(__('no direct script access allowed')); ?> <div class="light_blue_back" align="center">      <div class="adminbox">      <?php echo form_open('admin/catalog'); ?>           <fieldset>             <legend><b>admin login</b></legend>             <dl>                 <dt>                     <label for="street_address1"> <span class="req">*</span>email</label>                 </dt>                 <dd>                     <input type="text"  name="email" id="email"  value="<?php echo set_value('email'); ?>"/><?php echo form_error('email'); ?>                 </dd>             </dl>             <dl>                 <dt>                     <label for="street_address2">password</label>                 </dt>                 <dd>                     <input type="password" name="password" id="password"  value="<?php echo set_value('password'); ?>"/><?php echo form_error('password'); ?>                 </dd>             </dl>             <dl>                 <dt>                 </dt>               <dd>                   <?php echo form_submit('reg_sub', 'submit');?>                   <?php echo form_reset('reg_reset', 'reset');?>               </dd>             </dl>         </fieldset>     <?php //echo form_close('admin/catalog'); ?>     </form>      </div> </div> 

you can use set_flashdata show error message using session function sample code is:

$this->load->library('session');  $this->session->set_flashdata('loginerror', 'username , password mismatch'); 

you can show loginerror flashdata using isset php function on view page.

for more details visit link:

http://ellislab.com/codeigniter/user-guide/libraries/sessions.html