ASP.NET MVC 1.0 Release Candidate Now Available
page 18 of 20
by Scott Guthrie
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AJAX Improvements

The ASP.NET MVC RC includes a number of AJAX enhancements:

jQuery Intellisense Files included within ASP.NET MVC Project Template

Newly created ASP.NET MVC projects now include both the standard jQuery library (both full and compressed versions), as well as the –vsdoc intellisense documentation file used by Visual Studio to provide richer intellisense support for it (you can learn more about this here):

Figure 43

This enables rich jQuery JavaScript intellisense within client-script blocks and JavaScript files:

Figure 44

Today’s RC build ships jQuery 1.2.6.  We are planning to ship the upcoming jQuery 1.3.1 release for the final ASP.NET MVC 1.0 release, and will include an updated JavaScript intellisense file for it. 

Request.IsAjaxRequest Property

The Request.IsAjaxRequest property can be used to detect whether a request is being sent from an AJAX call on the client (and is useful for scenarios where you want to gracefully degrade if AJAX is not enabled).  The logic within this method was updated with the RC to now recognize the “X-Requested-With” HTTP header (in addition to the form field sent by ASP.NET AJAX).  This is a well known header sent by JavaScript libraries such a Prototype, jQuery, and Dojo – and now enables a unified way to check for AJAX within an ASP.NET MVC request. 

JavaScriptResult ActionResult and JavaScript() helper method

The Controller base class now has a JavaScript() helper method that returns a new ActionResult class of type JavaScriptResult.  This supports the ability to return raw JavaScript that will then be executed on the client by the built-in ASP.NET MVC helper methods.  This can be useful for scenarios where you want to cause conditional JavaScript to execute on the client based on server logic.

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User Comments

Title: Awesome article, great work!   
Name: George Loew
Date: 2009-03-25 12:20:05 AM
excellent article, scott! It is very useful and contain excellent information about ASP.NET MVC framework. I have had a chance to try this ASP.NET MVC technology with my current host ( and everything works beautifully.

I am rating 5 stars for this article and I am looking forward to your next articles.
Title: Cache Photo   
Name: Meysam
Date: 2009-03-05 2:14:50 AM
Is it possible to send cache status (304) in response to subsequent requests for a photo?

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