Thursday, 1 May 2014

Bundling and minification in MVC



You can also implement bundling and minification techniques with in Asp.net MVC3 and Asp.net 4.0.

Adding Reference
First of all add the references of System.Web.Optimization.dll and WebGrease.dll to your MVC3 and Asp.Net 4.0 projects as shown below. You can download the dll by using download link.




Creating Bundle
Now create the bundle for your css and js files with in the Global.asax file as shown below.
public static void RegisterBundles(BundleCollection bundles)
{
 //Creating bundle for your css files
 bundles.Add(new StyleBundle("~/Content/css").Include("~/Content/mystyle.min.css",
 "~/Content/site.min.css"));
 //Creating bundle for your js files
 bundles.Add(new ScriptBundle("~/bundles/jquery").Include(
 "~/Scripts/jquery-1.5.1.min.js",
 "~/Scripts/jquery.validate.min.js",
 "~/Scripts/jquery.validate.unobtrusive.min.js"));
}
Here, I have created the bundle of all required css and js files. You can also add your own css and js files with complete path using Include method.

Registering Bundle
You need to register above created bundles with in Application_Start event of Global.asax like as:
protected void Application_Start()
{
 RegisterBundles(BundleTable.Bundles);
 // Other Code is removed for clarity
}


Adding Bundles to Layout Page in MVC3
Now you can add the above created style and script bundles to the Layout page or where you want to use as shown below:
@System.Web.Optimization.Styles.Render("~/Content/css")
@System.Web.Optimization.Scripts.Render("~/bundles/jquery")


Adding Bundles to Master Page in Asp.Net 4.0
Now you can add the above created style and script bundles to the Master page or where you want to use as shown below:
<%: Styles.Render("~/Content/css") %>
<%: Scripts.Render("~/bundles/jquery")%>
In Asp.Net 4.0 you also required to add System.Web.Optimization namespace and assembly Microsoft.AspNet.Web.Optimization.WebForms reference to the web.config file of your Asp.Net 4.0 project as shown below:
<system.web>
 <compilation debug="true" targetFramework="4.0" />
 <pages>
 <namespaces>
 <add namespace="System.Web.Optimization" />
 </namespaces>
 <controls>
 <add assembly="Microsoft.AspNet.Web.Optimization.WebForms" namespace="Microsoft.AspNet.Web.Optimization.WebForms" tagPrefix="webopt" />
 </controls>
 </pages>
<!-- Other Code is removed for clarity -->
</sytem.web >
You need not to do any changes in web.config file of your MVC3 project.

Enabling Bundling and Minification in debug mode
Bundling and minification doesn't work in debug mode. So to enable this feature you need to add below line of code with in Application_Start event of Global.asax.
protected void Application_Start()
{
 BundleConfig.RegisterBundles(BundleTable.Bundles);
 //Enabling Bundling and Minification
 BundleTable.EnableOptimizations = true;
 // Other Code is removed for clarity
}


How it works..
Now run your application and you will see that all the css and js files are converted to single css and js file as shown below:



Minification
Minification is technique for removing unnecessary characters (like white space, newline, tab) and comments from the JavaScript and CSS files to reduce the size which cause improved load times of a webpage. There are so many tools for minifying the js and css files. JSMin and YUI Compressor are two most popular tools for minifying the js and css files. Use these tools for minifiying your css and js files and use in your application with ".min" suffix. So that you can easily identified that this is a minimize version of your css or js file.

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