<script type="text/javascript" data-author="Tony Partner">  
  $(document).on('ready pjax:scriptcomplete',function(){
 
    // Hide the submit button
    $('#ls-button-submit').hide();
 
    // Listener on the (hidden) radio inputs 
    $('#question{QID} :radio').on('change', function(e) {
      $('#ls-button-submit').trigger('click');
    });
  });
</script>