Codeigniter form validation won't run

Question

There seems to be many questions about form validation but none answer my problem.

Unless I'm missing something obvious, my form validation will not run, but only on a certain page, all other pages are fine.

Here is the problem code:

public function activate($code = '')
    {
        // This function lets a user activate their account with the code or link they recieved in an email
        if($code == '' || isset($_POST[''])){
            $form = '';
            $this->load->library('form_validation');
            $this->load->helper('form');

            if ($this->form_validation->run() == FALSE){
                // No code, so display a box for them to enter it manually
                $this->form_validation->set_rules('activation_code', 'Activation Code', 'trim|required|xss_clean|integer');

                $form .= validation_errors();
                $form .= form_open_multipart('user/activate', array('class' => 'formee'));

                $form .= form_label('Enter your activation code below and click \'Activate\' to start using your account. If you need a hand please contact live chat.', 'activation_code');
                $form .= form_input(array('name' => 'activation_code'));

                $data = array(
                    'name'        => 'submit',
                    'value'       => 'Activate',
                    'class'       => 'right',
                    'style'       => 'margin-top:10px;',
                );

                $form .= form_submit($data);
                $form .= form_close();
            }else{
                $form .= "form run";
            }
        }else{
            // Code recieved through the GET or POST variable XSS clean it and activate the account
        }

        $data = array(
            'title' => $this->lang->line('activate_title'),
            'links' => $this->gen_login->generate_links(),
            'content' => $form
        );
        $this->parser->parse('beer_template', $data);
    }

You can see the page here: http://77.96.119.180/beer/user/activate

You can see form validation working here: http://77.96.119.180/beer/user/register

Can anyone help?

Answer 1

You call the set_rules after the run:

if ($this->form_validation->run() == FALSE){
  // No code, so display a box for them to enter it manually
  $this->form_validation->set_rules('activation_code', 'Activation Code', 'trim|required|xss_clean|integer');

But should be before:

$this->form_validation->set_rules('activation_code', 'Activation Code', 'trim|required|xss_clean|integer');
if ($this->form_validation->run() == FALSE){
}