title: Confirm form submission error in codeigniter grocery crud
body: <p>When i click on back button, i got the confirm form submission error .How to prevent this issue?Please provide solution for this.
  I am trying to login to the admi panel   and   edit in admin in this following code</p>
  
  <pre><code> Admin controller:
          public function index()
          {
  
              $data = $this-&gt;data;
              $this-&gt;load-&gt;view('admin/login.php',$data);
          }
          public function login()
          {
              $data = $this-&gt;data;
              $username=$this-&gt;input-&gt;post("username");
              $password=$this-&gt;input-&gt;post("password");
  
              if($username=='admin'&amp;&amp;$password=='admin123')
              {
  
                  $this-&gt;load-&gt;view('admin/home.php',$data);
  
              }
              else
              {
                  $data['error']="Invalid Username or Password";
                  $this-&gt;load-&gt;view('admin/login.php',$data);
              }
          }
  
          /* Function For Displaying the home page*/
          public function home()
          {
  
              $data = $this-&gt;data;
              $this-&gt;load-&gt;view('admin/index.php',$data);
          }
          /* Common Function for calling the View*/
          public function _admin_output($output = null)
          {
              $output-&gt;base=$this-&gt;config-&gt;item('base_url');
              $output-&gt;site=$this-&gt;config-&gt;item('site_url');
              $output-&gt;css=$this-&gt;config-&gt;item('css');
              $output-&gt;js=$this-&gt;config-&gt;item('js');
              $this-&gt;load-&gt;view('admin/home_page.php',$output,'refresh');
  
          }
  
              public function loadSlidingimg()
          {
              $crud = new grocery_CRUD();
              $crud-&gt;set_table('tbl_slideimg');
              $crud-&gt;columns('imgname','active');
              $crud-&gt;set_subject('Frontpage Sliding Images');
              $crud-&gt;display_as('imgname','Image name');
              $crud-&gt;set_field_upload('imgname','uploads');   
              $crud-&gt;display_as('active','Active Flag');
              $crud-&gt;callback_after_update(array($this,'rename_slideimg_db'));
              $crud-&gt;callback_after_insert(array($this,'rename_slideimg_db'));
  
              $output = $crud-&gt;render();
              $this-&gt;_admin_output($output);
          }
          }
  </code></pre>
  
  <p>Please provide solution for this issue</p>