is there a way to process .NET/C# variables on external .js?

Question

I have my variable in an aspx.cs , such as :

protected string myVar="Hello";

Now, if I go to my scripts.js file added as :

<head>
    <script src="/scripts/scripts.js" type="text/javascript"></script>
</head>

and I try this :

var myVarJs="<%=myVar&>";

it doesnt get the .NET myVar value.

Is there a way to catch it or am I dreaming?

I think you can mark the script as .aspx and then you should be able to. — bevacqua
– bevacqua, Commented Sep 6, 2011 at 14:17
There are ways that you can get ASP.Net to dynamically process .js files, however doing this sort of thing inside a .js file is a bad idea as it would probably break client side caching. The answer that Ivan has posted is a much better solution. — Justin
– Justin, Commented Sep 6, 2011 at 14:20
I would like to see which is the best way to pass an Array to java script array ,maybe 2 dimensional String Array's . — Rosmarine Popcorn
– Rosmarine Popcorn, Commented Sep 6, 2011 at 14:37

Ivan Nikolchov · Accepted Answer · 2014-01-06 07:22:30Z

7

Insert the variable before the script:

<head>
    <script type="text/javascript"> var myVarJs="<%=myVar%>"; </script>
    <script src="/scripts/scripts.js" type="text/javascript"></script>
</head>

edited Jan 6, 2014 at 7:22

answered Sep 6, 2011 at 14:12

Ivan Nikolchov

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Comments

Base33 · Accepted Answer · 2011-09-06 14:17:34Z

2

You can also register/render client script. So you can declare variables in the backend and then render the javascript variables.

answered Sep 6, 2011 at 14:17

Base33

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1 Comment

Base33 Over a year ago

Check this ClientScriptManager out msdn.microsoft.com/en-us/library/…

Mac · Accepted Answer · 2011-09-06 14:19:57Z

2

I don't think it is possible to directly access C# variable in javascript code. As C# is client side and Javscript is server side.

Unless on the Asp.net page you save the variable in a hidden field or label as text which is not visible.

Asp:

<asp:HiddenField ID="hidden" runat="server" value="<%=strvariable %>" />

Javascript:

function Button_Click()
{
    alert(document.getElementById('hidden').value); 
}

So this would get the hidden field with the ID of "hidden".

This could work I think.

edited Sep 6, 2011 at 14:19

answered Sep 6, 2011 at 14:14

Mac

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