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Editorial Team
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Asked: 2026-05-23T04:46:33+00:00

I would like to get the value of an ASP.NET control from inside of

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I would like to get the value of an ASP.NET control from inside of a javascript file. I know how to do this when the javascript is on the aspx page, but not when it is in a js file. Example:

<head>
    <script type="text/javascript">
        alert('<%= lbl_test.Text %>'); //alerts the text of the ASP.NET label
    </script>

    <script type="text/javascript" src="Scripts/test.js" /> //alerts "<%= lbl_test.Text" %>
</head>

In this example test.js only has alert('<%= lbl_test.Text %>'); in it.

Is there anyway for me to reproduce the behavior in the first piece of javascript in the js file?

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1 Answer

  1. Editorial Team

    You cannot do it like this you will have to either

    1. pass in the control id from an aspx page (some . net page) that calls into the function in your javascript file

    or

    1. make your script file actually a .net output file. Then you can embed your code. name it for example javscriptwhatever.aspx but set the content type of the file in the code behind to be text/javascript as described here for example
      http://social.msdn.microsoft.com/Forums/en-US/jscript/thread/c706d380-9688-4758-9d7e-9522d59d5855
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