fix on sending post data without session cookie

frontend-js/src/main/js/ServerConnector.js

@@ -117,6 +117,7 @@ ServerConnector._readFile = function(url) {
 };
 
 ServerConnector.sendPostRequest = function(url, params) {
+  var self = this; 
   if (self.getSessionData().getToken() === undefined) {
     self.getSessionData().setLogin(undefined);
     window.location.reload(false);
@@ -140,6 +141,7 @@ ServerConnector.sendPostRequest = function(url, params) {
 };
 
 ServerConnector.sendPutRequest = function(url, params) {
+  var self = this; 
   if (self.getSessionData().getToken() === undefined) {
     self.getSessionData().setLogin(undefined);
     window.location.reload(false);
@@ -162,6 +164,7 @@ ServerConnector.sendPutRequest = function(url, params) {
 };
 
 ServerConnector.sendDeleteRequest = function(url, params) {
+  var self = this; 
   if (self.getSessionData().getToken() === undefined) {
     self.getSessionData().setLogin(undefined);
     window.location.reload(false);
@@ -185,6 +188,7 @@ ServerConnector.sendDeleteRequest = function(url, params) {
 };
 
 ServerConnector.sendPatchRequest = function(url, params) {
+  var self = this; 
   if (self.getSessionData().getToken() === undefined) {
     self.getSessionData().setLogin(undefined);
     window.location.reload(false);