file.js update

src/base/single/input/file.js

@@ -214,8 +214,10 @@
                                 break;
                         }
                     };
+                    if (isFunction(upload.onloadstart)) {
                         upload.onloadstart();
                     }
+                }
                 var boundary = "AjaxUploadBoundary" + (new Date).getTime();
                 xhr.setRequestHeader("Content-Type", "multipart/form-data; boundary=" + boundary);
                 if (handler.file.getAsBinary) {