Using ReCaptcha in Joomla Anywhere from XML and Validate it

RecaptchaUserGuide.md

Joomla ReCaptcha plugin

Steps to use Google ReCaptcha

1. Get recaptcha keys from

https://www.google.com/recaptcha/intro/index.html
i. Register new site
ii. Collect Site key
iii. Collect Secret key

2. Now go to Joomla Plugin manager and edit Captcha - ReCaptcha plugin, fill up the info and activate it if it's not already.

Captcha - ReCaptcha

3. Apply Settings in Joomla. Go to

Joomla Site => Global Configuration => Site => Default Captcha
set "Default Captcha"  =>  "Captcha - ReCaptcha"

4. Create xml form XML which has your captcha field

<field
  name="captcha"
  type="captcha"
  label="COM_CONTACT_CAPTCHA_LABEL"
  description="COM_CONTACT_CAPTCHA_DESC"
  validate="captcha"

/>

So your XML for gonna look like this

<?xml version="1.0" encoding="utf-8"?>
<form>
  <fieldset name="basic">        
    <field id="name"
      name="name"
      type="text"
      label="Name"
      description=""
      class="inputbox"
      size="30"
      default=""
      required="true"
    />  
  
    <field
      name="captcha"
      type="captcha"
      label="COM_CONTACT_CAPTCHA_LABEL"
      description="COM_CONTACT_CAPTCHA_DESC"
      validate="captcha"
    />
  
  </fieldset> 
</form>

5. Now load you XML form with joomla JForm

$form = JForm::getInstance('customForm','path/to/form/form.xml',array('control' => 'jform'));

6. Now load the form in your view file

$fieldSets = $form->getFieldsets();
foreach ($fieldSets as $name => $fieldSet) :
  foreach ($form->getFieldset($name) as $field):
    echo $field->getControlGroup();
  endforeach;
endforeach; 

or you can do it like this for extended styles

echo $form->getLabel('name');
echo $form->getInput('name')

6. After form submission validate form, first get the data

$data   = $this->input->get('jform', array(), 'array');
$form   = JForm::getInstance('customForm','path/to/form/form.xml');
$result = $form->validate($data);
// Check for validation errors.
if ($return === false)
{
  // codes goes here
  $return = '';
  // Get the validation messages from the form.
  foreach ($form->getErrors() as $message)
  {
    $return .= $message->getMessage();
  }
  
  //now you can return error msg
  return $return;
}
// validation successful, do your job here

7. you may need to include this code if your site fails to load jform class

jimport( 'joomla.form.form' );