Insert code into <head> using ASP.NET

Question

I have some code that looks something like this:

<head runat="server">
  <script type="text/javascript">
     var params = {};
     params.param1 = 'value1';
     params.param2 = 'value2';
     params.param3 = 'value3';
     params.param4 = ''; // ASP.NET value 1
     params.param5 = ''; // ASP.NET value 2
     function.call(params);
  </script>
</head>

How do I use ASP.NET to populate param4 and param5? I've read about master pages and content placeholders, but is there a way that I can just do something like params.param4 = '<%= var1 %>'; or params.param4 = '<asp:var />';?

Edit

Thanks to everyone who answered so quickly. I must have had a parsing error or something that made me think this wasn't possible. Just to make it clear what I did to solve my problem:

ASPX page:

<head>
  <script type="text/javascript">
     var params = {};
     params.param1 = 'value1';
     params.param2 = 'value2';
     params.param3 = 'value3';
     params.param4 = '<%= var1 %>';
     params.param5 = '<%= var2 %>';
     function.call(params);
  </script>
</head>

CS Code-Behind:

public string var1 { get; set; }

public string var2 { get; set; }

protected void Page_Load(object sender, EventArgs e)
{
   // setup code goes here
   var1 = 'param4';
   var2 = 'param5';
}

Note: You don't need runat="server" in the head, and just as long as the variables are public in the code-behind, they can be accessed via <%= %> in the <head>.

Scott Arrington · Accepted Answer · 2010-01-19 17:29:29Z

2

You sort of answered your own question. You can declare your variables in the code-behind and then use them in your code with <%= %> tags, or you can use the RegisterClientScriptBlock method to add the JavaScript to your page on the fly.

answered Jan 19, 2010 at 17:29

Scott Arrington

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1 Comment

JR. Over a year ago

Heh, thanks. For some reason, I tried this yesterday but got errors when trying to use those tags. Not sure what I did differently this time, but whatever; it works now. ^_^

hunter · Accepted Answer · 2010-01-19 17:29:32Z

1

you could do exactly that if weren't runat="server"

alternatively you could render out that params array server-side

Page.ClientScript.RegisterArrayDeclaration("params", "'value1','value2','value3','" + value4 + "','" + value5 + "'");

answered Jan 19, 2010 at 17:29

hunter

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Comments

Sheff · Accepted Answer · 2010-01-19 17:29:48Z

1

If your your values are public variables declared in the .cs part of the class you can do exactly what you described and read them out in server tags.

answered Jan 19, 2010 at 17:29

Sheff

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