jquery was not referenced in file

frontend-js/src/main/js/gui/MapContextMenu.js

@@ -4,6 +4,7 @@
 
 var ContextMenu = require('./ContextMenu');
 
+var $ = require('jquery');
 var logger = require('../logger');
 
 /**

frontend-js/src/main/js/gui/SelectionContextMenu.js

@@ -3,6 +3,7 @@
 /* exported logger */
 
 var ContextMenu = require('./ContextMenu');
+var $ = require('jquery');
 
 var logger = require('../logger');