FIX: locking the select subject menu, when faculty is chosen.

If you choose any faculty at the menu, it is possible to catch drop down menu with subjects at the previous stage. Now that behaviour is fixed.

Improves usability.

~dev_rating/media/js/discipline/general.js

@@ -15,8 +15,9 @@ $(function() {
         var optionVal = parseInt($("select.SelectFaculty").children("option:selected").val());
         if (optionVal <= 0)
             return;
-        
-        var g_facultyID = optionVal; 
+
+        selectSubject.attr("disabled", true);
+        var g_facultyID = optionVal;
         $.post(
             g_URLdir + "handler/map/GetSubjectsList",
             {
@@ -25,15 +26,18 @@ $(function() {
             function(data)
             {
                 selectSubject.select2("val", "");
-                selectSubject.attr("disabled", true);
                 data = (data !== "") ? $.parseJSON(data) : {};
                 var jProto = $($.parseHTML("<option></option>"));
                 selectSubject.html("");
-                
+
                 $.each(data, function (key, cur) { 
                     jProto.html(cur.Title).val(cur.ID);
                     selectSubject.append(jProto.clone());	
-                });  
+                });
+            }
+        ).always(
+            function(success)
+            {
                 selectSubject.removeAttr("disabled");
             }
         );