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Editorial Team
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Asked: 2026-05-31T01:25:12+00:00

Using C# .NET 3.5 Framework here to make an .aspx web page. Anyways, the

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Using C# .NET 3.5 Framework here to make an .aspx web page. Anyways, the page accepts a GET variable x, and if supplied, I want the page to hook a JavaScript function foo(x) to the onload event of the page. The GET variable must be passed as an argument to foo.

I’m more familiar with other server-side scripting languages, and for example, in php I might do something like the following snippet, where I embed the php right into the <head> of the html page in the <script> (for simplicity I just set foo to the window.onload as I probably will only ever have one function set to this event anyways):

...

<script language="javascript" type="text/javascript">
function foo(x) {
    alert( x );
}

<?php

if( isset($_GET["x"]) )
    echo "window.onload = foo('" . $_GET["x"] . "');";
?>
</script>

...

Alternatively, I make the .js file a php parsed file that outputs the same and link that from the html file via src attribute of <script> (but I would still need a bit of embedded PHP to pass the GET variable to that script file src URL).

Anyways, with this aspx stuff, it looks a lot different, in that I have an underlying .cs file and there seems to be a huge strive to separate logic like this from the content of the page (.aspx) file. I wasn’t really sure how to get this same kind of behavior in this kind of environment.

It’s kind of not really ideal to have my JavaScript source inside my C# source as a string, etc.

Anyways, I did some searches on this but I can’t really find a clean solution. Anyone have a sensible solution for this type of thing in .aspx?

I should also point out that I do not want to rely on JavaScript to parse the window.location for the GET variables, as I use extensive path rewriting and I want to be flexible for POST variables.

UPDATE

Ok, so using the answers so far that are more focused on asp side of things I can mimic the php flavor as close as possible with something like this:

...
    <script language="javascript" type="text/javascript">

    function foo(x) {
        alert( x );
    }


    <%    
       String x = this.Request["x"];
       if(!String.IsNullOrEmpty(x))
           Response.Write( "window.onload = foo('" + Server.UrlDecode(x) + "');" );

    %>
</script>
...

Though this works, it’s not exactly the answer I am looking for. I was hoping for an aspx.cs solution that would divorce the need to embed this kind of code in my html file. Perhaps I was misleading when I gave the PHP example. I’d like to handle this on the .cs side of the world rather than embedding it directly in the html of the aspx file. Any ideas?

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1 Answer

  1. Editorial Team

    I would define some global variables in your own script block and leave the main JS file alone.

    <script type="text/javascript">
var foo = <% = yourVar %>
</script>
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