* Completed ajax file upload support

Author: Brendon

ajax.js

@@ -80,23 +80,35 @@ Drupal.Ajax.invoke = function(hook, args) {
  * @return {Bool}
  */
 Drupal.Ajax.go = function(formObj, submitter) {
-  var submitterVal;
+  var submitterVal, submitterName, extraData;
   Drupal.Ajax.invoke('submit');
   submitterVal = submitter.val();
+  submitterName = submitter.attr('name');
   submitter.val(Drupal.t('Loading...'));
+  extraData = {};
+  extraData[submitterName] = submitterVal;
+  extraData['drupal_ajax'] = '1';
   formObj.ajaxSubmit({
-    beforeSend : function(xhr) {
-      xhr.setRequestHeader("X-Drupal-Ajax", "1");
-      return true;
-    },
+    extraData : extraData,
     beforeSubmit : function(data) {
       data[data.length] = {
-        name : submitter.attr('name'),
+        name : submitterName,
         value : submitterVal
       }
+      data[data.length] = {
+        name : 'drupal_ajax',
+        value : '1'
+      }
       return true;
     },
     dataType : 'json',
+    error: function (XMLHttpRequest, textStatus, errorThrown) {
+      window.alert(Drupal.t('ajax.module: An unknown error has occurred.'));
+      if (window.console) {
+        console.log('error', arguments);
+      }
+      return true;
+    },
     success: function(data){
       submitter.val(submitterVal);
       Drupal.Ajax.response(submitter, formObj, data);

ajax.module

@@ -47,15 +47,28 @@ function ajax_preprocess_page(&$variables) {
  */
 function ajax_form_alter(&$form, $form_state, $form_id) {
   if (array_key_exists('#ajax', $form) && $form['#ajax']) {
-    $found = FALSE;
+    $found = array('upload' => FALSE, 'submitter' => FALSE);
     ajax_invoke_alter($form, $form_state, $form_id);
     ajax_validator_set($form);
+    ajax_upload_find($form, $found);
     ajax_submitter_find($form, $found);
     ajax_submitter_set($form, $found);
   }
   return TRUE;
 }
 
+/**
+ * Finds upload field
+ *
+ * @param $form Assoc
+ * @param $found Assoc
+ *
+ */
+function ajax_upload_find(&$form, &$found) {
+
+}
+
+
 /**
  * Gets internal path from actual url path
  *
@@ -114,11 +127,11 @@ function ajax_validator_set(&$form) {
  * Sets the submitter
  *
  * @param $form Assoc
- * @param $found Bool
+ * @param $found Assoc
  * @return Bool
  */
 function ajax_submitter_set(&$form, $found) {
-  if (!$found) {
+  if (!$found['submitter']) {
     $form['#submit'][] = 'ajax_submitter';
     $form['#attributes']['class'] = 'ajax-form';
   }
@@ -129,7 +142,7 @@ function ajax_submitter_set(&$form, $found) {
  * Finds the submitter
  *
  * @param $form Assoc
- * @param $found Bool
+ * @param $found Assoc
  * @return Bool
  */
 function ajax_submitter_find(&$form, &$found) {
@@ -145,7 +158,7 @@ function ajax_submitter_find(&$form, &$found) {
         if (array_key_exists('#submit', $form[$form_key]) &&
             !empty($form[$form_key]['#submit'])) {
           $form[$form_key]['#submit'][] = 'ajax_submitter';
-          $found = TRUE;
+          $found['submitter'] = TRUE;
         }
       }
       //nested
@@ -284,7 +297,7 @@ function ajax_invoke_alter(&$form, &$form_state, $form_id) {
  * @return Bool
  */
 function ajax_validator(&$form, &$form_state) {
-  if (array_key_exists('HTTP_X_DRUPAL_AJAX', $_SERVER)) {
+  if (array_key_exists('drupal_ajax', $_REQUEST)) {
     drupal_get_messages(NULL, TRUE);
     $data = ajax_build(array(
       'messages_error' => form_get_errors()