Is there a way to use “<%= someObject.ClientID %>” in an external javascript file?

Question

Is there a way to use \"<%= someObject.ClientID %>\" in an external javascript file?

If I use the code

<%= someObject.ClientID %>
         


        

Answer 1

This is totally possible.

In your .aspx page, create a script reference to an aspx page that contains your javascript code:

Then, in MyJavaScriptFile.js.aspx you can write the following:

<%@ Page Language="C#" AutoEventWireup="false"  ContentType="text/javascript" %>

<% 
    var foo = new Whatever();
    foo.ClientId = 123;
%>

// Start Javascript
var clientId = <% HttpContext.Current.Response.Write(foo.ClientId); %>;

.

Also helpful - this technique supports querystring parameters:

Then, in MyJavaScriptFile.js.aspx, I can reference the value with

var username = '<% Request.QueryString["username"] %>';

It's not the "best practice" way to do things, but it gets the job done in a way that my caveman brain can understand without resorting to fancy workarounds.