How to Embed /Access JavaScript, CSS, Images in an Assembly.

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Introduction

This article makes you go through the concept on how to embed/access JavaScript, CSS and images to server control's assembly.

Background

Resources embedded within an assembly can be accessed through the WebResource.axd HTTP Handler. This Handler is needed because we need some mechanism to get this code at the client side to be executed and rendered as well (see the source code of the page - you will observe some strange URL code that you haven't written anywhere though it is present on that page. This is because of embedding and accessing JavaScript/CSS/Images through WebResource.axd).

Using the Code

We need to follow few steps for the completion of Embedding JS/CSS/Images in an Assembly.

Step 0

Simply add the file (JS/CSS/Image) to your project, go to the Properties pane, and set the Build Action to Embedded Resource.

Step 1: AssemblyInfo.cs Entries

[assembly: System.Web.UI.WebResource("Img_Button.gif", "img/gif")];//see Note

[assembly: System.Web.UI.WebResource("TextBox.css", "text/css")];
[assembly: System.Web.UI.WebResource("ABC.js", "text/js")];

Step 2: Embedding an Image

Image img= new Image();
img.ImageUrl = Page.ClientScript.GetWebResourceUrl(this.GetType(), "Img_Button.gif");

Step 3: Embedding a Stylesheet

string tempLink= "<link rel='stylesheet' text='text/css' href='{0}' />";
string location = Page.ClientScript.GetWebResourceUrl(this.GetType(), "TextBox.css");
LiteralControl include = new LiteralControl(String.Format(tempLink, location));
((HtmlControls.HtmlHead) Page.Header).Controls.Add(include);

Step 4: Embedding JavaScript

string srptLoc =Page.ClientScript.GetWebResourceUrl(this.GetType(), "ABC.js");
Page.ClientScript.RegisterClientScriptInclude("ABC.js", srptLoc);

Note

1. Add .axd extension in your virtual directory configuration (all configuration settings should be like that of ASPX extension).
2. File name should be DefaultNamespace.Filename.Extension (use reflector tool to get the actual name in the embedded assembly). This is required in Assemblyinfo.cs file entry see Step-1.
3. Write all the above code for registration OnPrerender(or OnInit) event.

//For Example :

protected override void OnPreRender(EventArgs e)
{
    // When pre-rendering, add in external JavaScript file
    Page.ClientScript.RegisterClientScriptInclude("ABC", 
                 Page.ClientScript.GetWebResourceUrl(this.GetType(), 
                                             "ABC.js"));

    base.OnPreRender(e);
}

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