Jquery – ‘JQuery’ is undefined


I am working on a ASP.net project created with local file system settings. I am using MVC and Jquery. Jquery is working fine when I run the application in debug mode i.e. in ASP.net Development server. I am trying to host the application in IIS 7. In hosted mode, it does not recognize Jquery and gives scripting error 'Jquery is undefined'. The locations of the script files is unchanged in both modes. Can anybody have any clue what can be the reason and how to solve this.

My code look like this;

<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<script src="../../Scripts/MicrosoftAjax.debug.js" type="text/javascript"></script>

<script src="../../Scripts/MicrosoftMvcAjax.debug.js" type="text/javascript"></script>

<script src="../../Scripts/jquery-1.2.6.js" type="text/javascript"></script>

<!-- YUI Styles -->
<link href="../../Content/reset.css" rel="stylesheet" type="text/css" />
<link href="../../Content/fonts.css" rel="stylesheet" type="text/css" />
<link href="../../Content/grids.css" rel="stylesheet" type="text/css" />
<!-- /YUI Styles -->
<link href="../../Content/knowledgebase.css" rel="stylesheet" type="text/css" />

<script type="text/javascript">
    //this hides the javascript warning if javascript is enabled
    (function($) {
        $(document).ready(function() {

<asp:ContentPlaceHolder ID="ScriptContent" runat="server" />


Best Solution

0 I do not know whether you guys found the solution to your problem or not. I was facing the same problem and going nuts to figure out why do I get "jQuery is undefined" error on the plugins i use. I tried all the solutions i get from the internet but no luck at all.

But, suddenly something splash on my mind that may be the script files should be in order. So, I moved the jquery referece to first position and everything start working like charm.

Remember guys, if you're using any plugins with jquery, make sure you use the folloing order of setting reference to those fiels.

  1. reference to the jquery library
  2. reference to the other subsequent plug-in (dependant) libraries and so on...


  1. "script src="js/jquery-1.3.2.min.js" type="text/javascript"...
  2. "script src="js/jqDnR.min.js" type="text/javascript"...
  3. "script src="js/jquery.jqpopup.min.js" type="text/javascript"...
  4. "script src="js/jquery.bgiframe.min.js" type="text/javascript"...

Always make sure you must put the jquery reference to first and then the subsequent libraries.

Hope, this solves your problem especially when you use with MasterPages. Its very strange that it works no matter what order you use when you don't use MasterPages but when you do, then it somehow requres the proper order.

Good luck and happy coding,

Vincent D'Souza