Prevent double submission of forms in jQuery

Question

I have a form that takes a little while for the server to process. I need to ensure that the user waits and does not attempt to resubmit the form by clicking the button agai

Answer 1

In my case the form's onsubmit had some validation code, so I increment Nathan Long answer including an onsubmit checkpoint

$.fn.preventDoubleSubmission = function() {
      $(this).on('submit',function(e){
        var $form = $(this);
        //if the form has something in onsubmit
        var submitCode = $form.attr('onsubmit');
        if(submitCode != undefined && submitCode != ''){
            var submitFunction = new Function (submitCode);
            if(!submitFunction()){
                event.preventDefault();
                return false;
            }                   
        }

        if ($form.data('submitted') === true) {
            /*Previously submitted - don't submit again */
            e.preventDefault();
        } else {
          /*Mark it so that the next submit can be ignored*/
          $form.data('submitted', true);
        }
      });

      /*Keep chainability*/
      return this;
    };