asp.net - How2: what event to hook in HttpModule for putting js links into head element

Question

I want to have HttpModule to inject javascripts, css links into HEAD element from some simple config data. I am not sure which event I should hook?

Curently I use
- context.PreRequestHandlerExecute for changing the masterpage dynamically
- Context.BeginRequest for SEO optimalization

There is some help at HTTPModule Event Execution Order?

Thanks for any tip. Cheers, X.

Answer 1

using System;
using System.Web;
using System.Web.UI;

namespace YourNamespace
{
    public class YourModule : IHttpModule
    {
        public void Init(HttpApplication context)
        {
            context.PreRequestHandlerExecute += Application_PreRequestHandlerExecute;
        }

        private void Application_PreRequestHandlerExecute(object sender, EventArgs e)
        {
            Page page = HttpContext.Current.CurrentHandler as Page;
            if (page != null)
            {
                string script = "/js/jquery.1.3.2.min.js";
                if (page.Header != null)
                {
                    string scriptTag = String.Format("<script language="javascript" type="text/javascript" src="{0}"></script>
", script);
                    page.Header.Controls.Add(new LiteralControl(scriptTag));
                }
                else if (!page.ClientScript.IsClientScriptIncludeRegistered(page.GetType(), script))
                    page.ClientScript.RegisterClientScriptInclude(page.GetType(), script, script);
            }
        }

        public void Dispose() { }
    }
}

ASP.Net Lifecycle: http://msdn.microsoft.com/en-us/library/ms178473.aspx