Index: branches/5.3.x/core/units/helpers/ajax_form_helper.php
===================================================================
diff -u -N -r15677 -r15902
--- branches/5.3.x/core/units/helpers/ajax_form_helper.php	(.../ajax_form_helper.php)	(revision 15677)
+++ branches/5.3.x/core/units/helpers/ajax_form_helper.php	(.../ajax_form_helper.php)	(revision 15902)
@@ -39,13 +39,49 @@
 				}
 
 				$error_field = $object->GetFieldOption($field, 'error_field', false, $field);
-				$error_msgs[$field] = $object->GetErrorMsg($error_field);
+				$error_msgs[$field] = $object->GetErrorMsg($error_field, false);
 			}
 
 			return $error_msgs;
 		}
 
 		/**
+		 * Returns information about all uploader fields.
+		 *
+		 * @param kDBItem $object Object to process
+		 * @param array|null $fields Fields filter.
+		 *
+		 * @return array
+		 * @access public
+		 */
+		public function getUploaderInfo(kDBItem $object, $fields = null)
+		{
+			$ret = array();
+
+			if ( !isset($fields) ) {
+				$fields = array_keys($object->getFields());
+			}
+
+			foreach ($fields as $field) {
+				$formatter = $object->GetFieldOption($field, 'formatter');
+
+				if ( !$formatter ) {
+					continue;
+				}
+
+				if ( $formatter == 'kUploadFormatter' || in_array('kUploadFormatter', class_parents($formatter)) ) {
+					$ret[$field] = array(
+						'urls' => $object->GetField($field, 'file_urls'),
+						'names' => $object->GetField($field, 'file_names'),
+						'sizes' => $object->GetField($field, 'file_sizes'),
+					);
+				}
+			}
+
+			return $ret;
+		}
+
+		/**
 		 * Sends JSON-encoded response as event result to the browser
 		 *
 		 * @param kEvent $event
@@ -71,12 +107,28 @@
 		 * @param kEvent $event
 		 * @param string $call_event
 		 * @param Array $params
+		 * @param Closure $callback
+		 * @return bool
+		 * @access public
 		 */
-		public function transitEvent($event, $call_event, $params = Array ())
+		public function transitEvent($event, $call_event, $params = Array (), $callback = null)
 		{
 			$params['status'] = 'OK';
 			$event->CallSubEvent($call_event);
 
+			$form_data = $event->getEventParam('form_data');
+
+			if ( $form_data !== false ) {
+				$object = $event->getObject();
+				/* @var $object kDBItem */
+
+				$params['uploader_info'] = $this->getUploaderInfo($object, array_keys($form_data));
+			}
+
+			if ( is_callable($callback) ) {
+				call_user_func($callback, $event);
+			}
+
 			if ( $event->status != kEvent::erSUCCESS ) {
 				$this->prepareJSONErrors($event, $params);
 			}
@@ -92,5 +144,7 @@
 			}
 
 			$this->sendResponse($event, $params);
+
+			return $params['status'] == 'OK';
 		}
 	}
\ No newline at end of file