Question

I have a question about form validation in CodeIgniter:

<? form_open('user/check_login' ?>
  <fieldset id="login_fields">
     <label for="login">Login</label>
          <input name="login" type="text" class="textfield" id="login" />
     <label for="password">Password</label>
          <input name="password" type="password" class="textfield" id="password" />
     <input type="submit" name="Submit" value="Login" />
  </fieldset>
</form>

As the you can see above, the form is submitted to check_login method in user controller.

After a certain number of unsuccessful login attempts, I would include another input field (captcha) in the form. For example

<? if ($attempts > 3) { ?>
<label for="captcha">captcha</label>
          <input name="captcha" type="text" class="textfield" id="captcha" />
<? } ?>

But the problem is that when the extra field is added, and the form is submitted then, how the check_login method will know that this time captcha field was added in the form, and that can not be left blank.

Thanks.

Answer 1

isset( $_POST[‘captcha’] )

or

$this->input->post(‘captcha’) not equals to FALSE

if any of this conditions are meet, the add the rule to the form_validation.