$(document).ready(function() {
  $('form').submit(function() {
    if(typeof jQuery.data(this, "disabledOnSubmit") == 'undefined') {
      jQuery.data(this, "disabledOnSubmit", { submited: true });
      $('input[type=submit], input[type=button]', this).each(function() {
        $(this).attr("disabled", "disabled");
      });
      return true;
    }
    else
    {
      return false;
    }
  });
});

http://blog.damienalexandre.fr/index.php?post/2009/08/02/jQuery-eviter-la-soumission-multiple-d-un-formulaire

To prevent multiple submit from sending more than one request, 
bind the submit event and store a "disabledOnSubmit" data. Next time the event "submit" will be fire, the following jQuery code will return false. All submit buttons are also disabled (nice user feedback).

jQuery to prevent multiple submit on a form

javascript, jquery

jQuery