How do I setup recaptcha on an override of "default_login.php"

Question

I've set up the standard recaptcha plugin in Joomla. I did an override of the login page and it wasn't showing the recaptcha, so I tried to add it by following the answer from these pages:

My Captcha stopped working after upgrading to Joomla 3.5

https://stackoverflow.com/questions/12840015/how-to-use-joomla-recaptcha-plugin-to-my-custom-module

The problem is that the recaptcha shows up fine, but I'm able to login without using the captcha check button / image clicking... I have figured out a way to check it before sending with jquery, but the big hurtle is that I don't understand why it is going through on the server side? should'n Joomla handle that as it's a build in plugin?

Here's the code I've put inside the <form tag> (copy paste from the first link):

<?php
$captcha_plugin = JFactory::getConfig()->get('captcha');
if ($captcha_plugin != '0') {
  $captcha = JCaptcha::getInstance($captcha_plugin);
  $field_id = 'your_old_and_useless_id';
  print $captcha->display($field_id, $field_id, 'g-recaptcha');
}
?>

And I don't know what this defines? $field_id = 'your_old_and_useless_id'; I've tried to look it up, but I can't really find any documentation on how to inplement the Joomla standard recaptcha.

I really apriciate your help! thanks!!

Answer 1

I cannot see how the accepted answer answers the question. So, since you are quoting from my answer on the other question, I will explain what I meant.

The JCaptcha::display() function accepts three arguments: Name, ID and Class. Since Joomla 3.5, the first two arguments were rendered useless. That's why I wrote your_old_and_useless_id as the $field_id. Since it has been more than 2 years since I last checked this Joomla code, I cannot be sure that it is still useless!

Now, your question seems to ask if the captcha is automatically validated. It is not. You need to validate it amongst your other fields to validate. Here is the code I have used:

if (JFactory::getConfig()->get('captcha') != '0') {
    $captcha = JCaptcha::getInstance(JFactory::getConfig()->get('captcha'));
    $isValidated = $captcha->checkAnswer('your_old_and_useless_id');
}

Answer 2

This won't work. View does not and cannot handle data validation. It's a task for controller/model. Login forms in Joomla! do not support plugins at the moment. There are several ways to achieve what you want:

1) Create a custom component for login functionality and a plugin to redirect com_users traffic to this component.

2) Create a plugin that alters the login form and performs custom validation on login task.

3) Use MVCOverride plugin to override com_users login controller/model.