I have built a email newsletter signup form which posts into mailchimp from my website. I have Google reCAPTCHA added to the form and have a data-callback to enable the submit button as it is initially disabled. This was working fine in all browsers last night and did tests with success & signed off on it..and went home. I got in this morning and found the subscribe button will not enable / data-callback does not work? Strange..

Callback

<div class=g-recaptcha data-callback=recaptcha_callback data-sitekey=xxxxx></div>  

Input button at bottom of form

<input type=submit value=Subscribe name=subscribe id=mc-embedded-subscribe class=button disabled>

Scripts

<script src='https://www.google.com/recaptcha/api.js'></script>

<script src=//ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js></script>    

<script type=text/javascript>

    $(document).ready(function() {

      function recaptcha_callback(){

        alert(callback working);

        $('.button').prop(disabled, false);

      }

    )};

</script>