Joomla Ajax Form Submit from Module. help link:https://github.com/Joomla-Ajax-Interface

joomla-modul-form-ajax.js

/**
 * @package		Custom use
 * @author 		Abu Huraira Bin Aman shams.bd71@gmail.com
 * @license 	GNU General Public License version 3 or later; see LICENSE.txt
 * @version 	1.0.0
 */
(function($){

  $(document).ready(function(){
    $('#myform').submit(function() {
    
      var value   = $(this).serializeArray(),
      
      $.ajax({
        type   : 'POST',
        data   : value,
        beforeSend: function(){
          $('#myform .submit').addClass('loading');
        },
        success: function (response) {
          $('#myform .message').fadeOut().html(response).fadeIn().delay(1000);
          $('#myform .submit').removeClass('loading');
        }
      });
    
      return false;
    
    });
  });

})(jQuery);

joomla-modul-form-ajax.php

<?php
/**
 * @package		Custom use
 * @author 		Abu Huraira Bin Aman shams.bd71@gmail.com
 * @license 	GNU General Public License version 3 or later; see LICENSE.txt
 * @version 	1.0.0
 */
 // no direct access
defined( '_JEXEC' ) or die( 'Restricted access' );
?>
<form id="myform" name="myform">
  
  <button type="submit" class="submit">Submit</button>
  <div class="message"></div>
  <input type="hidden" name="option" value="com_ajax" />
  <input type="hidden" name="module" value="xpertcontact" />
  <input type="hidden" name="format" value="raw" />
  <?php echo JHtml::_('form.token'); ?>

</form>