js file Compressor for ASP.Net applications

• Download ClassLibrary1.zip - 3.0 KB

Introduction

Compress js file while rendering by browser

Using the code

Download the code, and build the dll.

Create a WebSite, or Add a reference of the dll to the WebSite.

In Web.Config file a new httpHandler in HttpHandlers Section.

<add verb="*" path="*.js" validate="false" type="ClassLibrary1.Handler, ClassLibrary1, Version=1.0.0.0, Culture=neutral" />

That's all, rest of the work will be done by our Handler.

Let us see how it works,

Basically the HttpHandlers are used to handle the request of the WebApplication.

This Handler is to handle the javascript file.

it removes the white spaces, new line characters, inline comments and multiline comments.

the Handlers class is inherited from the IHttpHandler Interface, it implements ProcessRequest method.

//Getting the script file name from request 

Uri url = context.Request.Url; 
string filename = url.Segments[url.Segments.Length-1]; 

//Creating a file stream to read the script file. 

FileStream fs = new FileStream(context.Server.MapPath(filename), FileMode.Open); 
StreamReader sr = new StreamReader(fs); 
string js = sr.ReadToEnd(); 
string a = string.Empty , b = string.Empty; 
//Removing the single line comments 

while (js.IndexOf("//")!=-1) 
{
 a = js.Substring(0, js.IndexOf("//"));
 b = js.Substring(js.IndexOf("\r\n", js.IndexOf("//")));
 js = a+b; 
} 
//Removing multiline comments 

while (js.IndexOf("/*") != -1) 
{
 a = js.Substring(0, js.IndexOf("/*"));
 b = js.Substring(js.IndexOf("*/", js.IndexOf("/*"))+2);
 js = a + b; 
} 
//To Remove Blank spaces 

js = js.Replace(" ", string.Empty); 
//To remove Carrige retun and new line character 

js = js.Replace("\r", string.Empty); 
js = js.Replace("\n", string.Empty); 
//Flushing it in response 

context.Response.Write(js); 
//Closing the resourses used 

sr.Close(); 
fs.Close(); 
sr.Dispose(); 
fs.Dispose(); 

This makes the file compressed, and if any intruder tries to access your code, he will feel difficult to trace back the functionalities since the indentation and comments are missing. But still he can do it if he have patience:).

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