Question

In my viewModel i want to get the current session value. For that i have written like this :

self.currentUserId = ko.observable(HttpContext.Current.Session["UserID"]);

But its showing me error that

ReferenceError: HttpContext is not defined.

How to define HttpContext? OR Is there any way to get current session value?

Answer 1

Change your statement

self.currentUserId = ko.observable(HttpContext.Current.Session["UserID"]);

To
If your application using webform and viewmodel is inline with aspx page

self.currentUserId = ko.observable('<%=HttpContext.Current.Session["UserID"]%>');

if MVC with razor view engine with inline viewmodel of view

self.currentUserId = ko.observable('@HttpContext.Current.Session["UserID"]');

and if your viewmodel is in external js file, then first store it in a js variable and use in that js

like, you can’t use HttpContext.Current.Session["UserID"] in external js file.

<script type="text/javascript" src='<path_of_knochout.js>'></script>

<script type="text/javascript">
    var userId = '<%=HttpContext.Current.Session["UserID"] %>';
</script>

<script type="text/javascript" src='<your_view_model_js>'></script>

in <your_view_model_js> file use

self.currentUserId = ko.observable(userId);