Introduction
Microsoft ASP.NET AJAX enables you to quickly create Web pages
that include a rich user experience with responsive and familiar user interface
(UI) elements. ASP.NET AJAX provides client-script libraries that incorporate
cross-browser ECMAScript (JavaScript) and dynamic HTML (DHTML) technologies,
and it integrates them with the ASP.NET 2.0 server-based development
platform. By using ASP.NET AJAX, you can improve the user experience and
the efficiency of your Web applications.
Why Use ASP.NET AJAX?
ASP.NET AJAX enables you to build rich Web applications that have
many advantages over Web applications that are completely server-based. ASP.NET
AJAX applications offer:
Improved
efficiency by performing significant parts of a Web page's processing in the
browser. Familiar
UI elements such as progress indicators, tooltips, and pop-up windows. Partial-page
updates that refresh only the parts of the Web page that have been updated. Client
integration with ASP.NET application services for forms authentication and user
profiles. Integration
of data from different sources through calls to Web services. A
framework that simplifies customization of server controls to include client
capabilities. Support
for the most popular and generally used browsers, including Microsoft Internet
Explorer, Mozilla Firefox, and Apple Safari.
ASP.NET AJAX Architecture
ASP.NET AJAX consists of client-script libraries and of
server components that are integrated to provide a robust development
framework. In addition to ASP.NET AJAX, you can use the ASP.NET AJAX Control
Toolkit and the community-supported features in the ASP.NET AJAX Futures
releases.
ASP.NET AJAX Server and client architecture
ASP.NET AJAX Server Architecture
The ASP.NET AJAX server components consist of ASP.NET controls and
components to manage the UI and flow of an application, and to manage
serialization, validation, control extensibility, and so on. There are also
ASP.NET Web services that enable you to access ASP.NET application services for
forms authentication and user profiles.
ASP.NET AJAX Server Controls
The ASP.NET AJAX server controls consist of server and client
code that integrate to produce AJAX-like behavior. The following list describes
the most frequently used ASP.NET AJAX server controls.
Manages script resources for client components, partial-page
rendering, localization, globalization, and custom user scripts. The ScriptManager control is required in order
to use the UpdatePanel, UpdateProgress, and Timer controls.
Enables you to refresh selected parts of the page instead of
refreshing the whole page by using a synchronous postback.
Provides status information about partial-page updates in UpdatePanel controls.
Performs postbacks at defined intervals. You can use the Timer control to post the whole page, or use
it together with the UpdatePanel control to perform partial-page
updates at a defined interval.
ASP.NET AJAX Web Services
ASP.NET AJAX provides Web services that you can use from client
script to work with ASP.NET application services for forms authentication and
user profiles. This enables you to use client script to help protect resources
by using forms authentication and to persist user-specific settings on the
server. In addition, ASP.NET AJAX includes network components that make it easy
to return results from any Web service call. For information and examples, see Asynchronous Communication Layer Overview and ASP.NET Application Services Tutorials.
ASP.NET AJAX Server Control
Extensibility
ASP.NET AJAX enables you to create custom ASP.NET AJAX server
controls that include client behaviors. For more information and examples, see
the ASP.NET AJAX Extensibility tutorials and the
Microsoft ASP.NET AJAX Control Toolkit.
ASP.NET AJAX Client Architecture
The ASP.NET AJAX client-script libraries consist of
JavaScript (.js) files that provide features for object-oriented development.
This has not been previously available to JavaScript developers. The
object-oriented features included in the ASP.NET AJAX client-script
libraries enable a new level of consistency and modularity in client scripting.
The following layers are included in the ASP.NET AJAX script
libraries:
A
browser compatibility layer. This provides compatibility across the most
frequently used browsers (including Microsoft Internet Explorer, Mozilla
Firefox, and Apple Safari) for your ASP.NET AJAX scripts. ASP.NET
AJAX core services, which include extensions to JavaScript, such as
classes, namespaces, event handling, inheritance, data types, and object
serialization. An
ASP.NET AJAX base class library, which includes components such as string
builders and extended error handling. A
networking layer that handles communication with Web-based services and
applications, and that manages asynchronous remote method calls.
ASP.NET AJAX Control Toolkit
The ASP.NET AJAX Control Toolkit is a collection of samples and
components that show you some of the experiences you can create with rich
client ASP.NET AJAX controls and extenders. The Control Toolkit provides both
samples and a powerful SDK to simplify creating and reusing your custom
controls and extenders. You can download the ASP.NET AJAX Control Toolkit from
the ASP.NET Ajax Web site.
ASP.NET AJAX Community-supported
Futures Releases
The ASP.NET AJAX community-supported Futures releases provide
features that extend the core ASP.NET AJAX platform with functionality that
remains under development and that is not included in the Microsoft ASP.NET
AJAX release. This includes additional extender controls, support for
client declarative syntax (xml-script), and more. To download and learn more
about the community-supported Future release, see the ASP.NET
AJAX Web site.
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