form-validation depending on a checkbox

[eluser]Haloperidol[/eluser]
maybe:

Code:

...
   // all the validations you want to run by default
   $this->form_validation->set_rules('email', 'E-mail', 'trim|required|valid_email');

   if (isset($this->input->post('checkbox_name')) && $this->input->post('checkbox_name') == 'on')
   {
      $this->form_validation->set_rules('other_variables', 'blablabla', 'trim|required');
   }

   if ($this->form_validation->run() === TRUE) {
...