Verify Recaptcha

verify-recaptcha.html

<script src="https://www.google.com/recaptcha/api.js?onload=onloadCallback&render=explicit" async defer></script>

<form>
    <div id="re-captcha"></div>
    <input type="submit" value="Submit" id="contactFormSubmit" value="Submit" disabled />
</form>

<script>
    var actCallback = function (response) {  
      $('#contactFormSubmit').prop('disabled', false);
      $('#re-captcha').remove();
    };
          
    var expCallback = function() {
      $('#contactFormSubmit').prop('disabled', true);
    };
          
    var onloadCallback = function () {
      var widget = grecaptcha.render(document.getElementById('re-captcha'), {
        'sitekey' : 'YOUR-SITE-KEY',
        'theme': 'light',
        'callback' : actCallback,
        'expired-callback': expCallback,
      });
    } 
  </script>