#380; reset form enctype attribute

Author: malsup

jquery.form.js

@@ -12,6 +12,7 @@
 
 // AMD support
 (function (factory) {
+    "use strict";
     if (typeof define === 'function' && define.amd) {
         // using AMD; register as anon module
         define(['jquery'], factory);
@@ -491,7 +492,10 @@ $.fn.ajaxSubmit = function(options) {
         // take a breath so that pending repaints get some cpu time before the upload starts
         function doSubmit() {
             // make sure form attrs are set
-            var t = $form.attr2('target'), a = $form.attr2('action');
+            var t = $form.attr2('target'), 
+                a = $form.attr2('action'), 
+                mp = 'multipart/form-data',
+                et = $form.attr('enctype') || $form.attr('encoding') || mp;
 
             // update form attrs in IE friendly way
             form.setAttribute('target',id);
@@ -573,6 +577,7 @@ $.fn.ajaxSubmit = function(options) {
             finally {
                 // reset attrs and remove "extra" input elements
                 form.setAttribute('action',a);
+                form.setAttribute('enctype', et); // #380
                 if(t) {
                     form.setAttribute('target', t);
                 } else {