Core JavaScript files in the Microsoft AJAX Library

The JavaScript files provide client side functionality for your web pages. Three JavaScript files are stored as resources in the System.Web.Extensions assembly.

At runtime, the HTTP handler ScriptResourceHandler loads the files, caches them for future use, compresses them, and sends them to the web browser when they’re requested:

* MicrosoftAjax.js, contains most of the Microsoft AJAX Library’s functionality, the browser compatibility layer, the core JavaScript classes, and the Base Class Library.

* MicrosoftAjaxTimer.js, contains classes to support the Timer server control. This control enables you to update either part of or an entire web page at regular intervals,

* MicrosoftAjaxWebForms.js, contains classes to support partial page rendering, this functionality allows portions of a page to be updated asynchronously.

Core JavaScript files in the Microsoft AJAX Library