I have a ASP .Net MVC4 Web application. In it I have my usual html for the _Layout.cshtml, which in turn loads the default Home/Index. All works fine.

In my index I am also loading a partial view. This works fine too. No probs.

I am using a the UI tools from the following site:

http://www.keenthemes.com/preview/index.php?theme=metronic

The problem is it seems to be primarily HTML4 and not designed for MVC out of the box so I am having to tweak it slightly to get it to work the way I want. (Nothing beyond anything very basic). For example, moving one part out to the index and using Renderbody() to load it so the actual html structure never changes. I have done this a million times to be sure I am not missing any closing tags or anything else that could cause my problem.

Up to this point there is no problem at all. Everything loads as it should.

I continued to create a 2nd View and its partial to extract other parts of the site. As usual, baby steps first. Before extracting any other code, I just used a little Hello World in the first page, and a similar string in the partial to be sure it was working. It was.

Now when I type in the url Home/ActionName the whole thing reloads as it should but looks horrible. and I get this error message:

0x800a1391 - JavaScript runtime error: 'jQuery' is undefined

Below is my code which clearly defines it:

<!-- BEGIN CORE PLUGINS -->

<script src=assets/plugins/jquery-1.8.3.min.js type=text/javascript></script>

<script>

    jQuery(document).ready(function ()

    {

        App.init(); // initlayout and core plugins

        _Layout.init();

        _Layout.initJQVMAP(); // init index page's custom scripts

        _Layout.initCalendar(); // init index page's custom scripts

        _Layout.initCharts(); // init index page's custom scripts

        _Layout.initChat();

        _Layout.initDashboardDaterange(); //Red date range

        _Layout.initIntro(); //Pop up messages

    });

</script>

It points me to the jQuery(document).ready part when I see the message.

Again, when I load the page normally, it works fine. When I type Home on its own it works fine. Its only when I type Home/AnythingElse that it gives this error message. Even if I type Home/ which should load in the Index file, it gives me this error message.

jQuery is defined, so why is this happening on postback?

Any help is appreciated.