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Editorial Team
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Asked: 2026-05-21T05:11:17+00:00

I’m currently working on a project where I need to use a lot of

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I’m currently working on a project where I need to use a lot of AJAX AutoCompleteExtenders, and they have been working fine- but now I’m tidying up the code and implementing a master page, I’m running into issues. I have this JS:

$find('txtName')._onMethodComplete = function(result, context) {

$find('txtName')._update(context, result, false);
webservice_callback(result,context);
};

And when I load the page, this error occurs relating to that snippet:

Microsoft JScript runtime error: ‘null’ is null or not an object

Just to reiterate, this only happens when I have a master page for some bizarre reason. Any ideas?

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1 Answer

  1. Editorial Team

    You need to use <%=txtName.ClientID%> because with master pages in use your ids will be mangled to avoid namecollision between masterpage and aspx/usercontrols etc.

    However please note that to be able to use <%= you will have to include the JS in the ASP.NET markup code. This can be done with the IIS #include rather than using script‘s src.

    Example:

    <!-- #Include virtual=".\JS\YourJSFileWithASPNETMarkup.js" -->
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