AJAX Patterns with ASP.NET
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This session takes a deeper look at the AJAX paradigm by discussing key development patterns. It demonstrates implementing them using a combination of out-of-the-box features and as well as features built by leveraging the extensibility of the platform. Patterns covered range from fundamentals such as networking, search optimization, navigation, and unobtrusive script attachment to user interface usability techniques such as visual notifications, and customization. The demonstrations are illustrated in the context of a simple scenario, but are designed to be applied directly to real-world applications.
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AJAX Patterns with ASP.NET
- 2. Nikhil Kothari Software Architect Microsoft Corporation
- 3. Look at Ajax scenarios beyond the basics Run through a sequence of patterns and solutions Solve real-world problems Create better user experiences Demonstrate how ASP.NET enables these scenarios
- 4. From Wikipedia… Design pattern: General repeatable solution to commonly occurring problem in software design. Various categories of patterns Foundational patterns Separation of code and behavior, data access, searchability User experience patterns Notifications, intuitive navigation, …
- 6. Script attachment to enable interactivity (eg. accordion) Logical navigation to provide optimal back/forward behavior and bookmarkability Update indicators and gestures to provide feedback in dynamic user interfaces Smart data access to enable rich visualization and indexability Mashing up to enhance application content
- 7. - Separation of content and behavior - Enhancing semantic markup with script
- 8. Attaching script functionality to static content Separation of content (HTML+CSS) and behavior (Script) Include scripts as referenced files and attach event handlers dynamically Benefits Facilitate designer/developer workflow Independently work on content and functionality at the same time More likely to work in script-disabled environments ASP.NET AJAX offering Client-side behaviors and controls are first class concept Class pattern for script to enable encapsulating data and logic ExtenderControl allows extending existing UI controls on server
- 9. - Controlling or “fixing” the back button - Adding support for bookmarking
- 10. Implement logical views and associated back/forward navigation Define logical views Be selective about which views and user interaction end up in history Benefits User model is preserved – back takes user to previous view Back through form entry can be prevented Different views of the page can be bookmarked AJAX actually enables a better navigation model ASP.NET AJAX offering History server control and client-side API API supports multiple parts of the page participating in history
- 11. - User gestures and feedback for dynamic UI
- 12. Use UI gestures to indicate changes and updates to pages as a result of user actions Highlighting, scrolling, focus, progress, … Be subtle, use simple animations, don't be annoying Benefits Ability to guide user Add additional pizzaz to your application AJAX can actually enable a better UI model for dynamic UI ASP.NET AJAX offering UpdateAnimation control in Ajax Control Toolkit UpateIndicator prototype control
- 13. Data access in Ajax applications without sacrificing indexability
- 14. Accessing data in an Ajax application without sacrificing indexability Don't send empty pages Embed initial data in page as semantically correct markup Client-side script might completely alter the visualization to create a rich experience Include additional pages of data in sitemap Benefits Use of semantic markup aids indexability Works well with script-disabled environments Saves initial Ajax request for data ASP.NET Ajax offering Enables leveraging the server programming model Data controls infrastructure
- 15. - Enhancing content with external content - Accessing services using JSONP and server proxies
- 16. Lots of interesting scenarios for integrating services One is content enhancement Typically mashups are written using server-side proxies Require cross-domain calls Enables use of configuration (eg. for API key), local caching, throttling calls JSONP enables use of services directly from the client Service needs to support it Uses script tags to enable cross-domain calls Implied trust in service API and service provider ASP.NET AJAX networking stack allows plugging in JSONP ScriptExecutor instead of default XMLHttpExecutor
- 17. There are many more interesting and relevant patterns Richer Plugin Diagnostics … Patterns on the Web http://ajaxpatterns.org Yahoo! Design Patterns site: http://developer.yahoo.com/ypatterns
- 18. DEV08 – Go Deep with AJAX DEV19 – High-Speed Development with the AJAX Control Toolkit BD007 – Search Capabilities for ASP.NET Web Content DEV05 – Developing ASP.NET AJAX Controls with Silverlight
- 19. ASP.NET AJAX site http://ajax.asp.net - Download bits, read docs/quickstarts, watch how-to videos, participate in forums and community Just released: ASP.NET Futures CTP ASP.NET AJAX Control Toolkit http://www.codeplex.com/AtlasControlToolkit - Open source community project, 30+ controls Blogs http://www.nikhilk.net http://weblogs.asp.net/scottgu http://weblogs.asp.net/bleroy http://weblogs.asp.net/elipton
- 20. Think about the set of problems at the app infrastructure and user experience How can Ajax help improve and differentiate? Patterns provide terminology to talk about these problems and solutions Check out ASP.NET AJAX Extensible platform for building and scaling to broad range of applications ASP.NET AJAX Control Toolkit has a number of out-of-box controls to get you started
- 23. © 2007 Microsoft Corporation. All rights reserved. Microsoft, Windows, Windows Vista and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries. The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.
- 24. This session takes a deeper look at the AJAX paradigm by discussing key development patterns. It demonstrates implementing them using a combination of out-of-the-box features and as well as features built by leveraging the extensibility of the platform. Patterns covered range from fundamentals such as networking, search optimization, navigation, and unobtrusive script attachment to user interface usability techniques such as visual notifications, and customization. The demonstrations are illustrated in the context of a simple scenario, but are designed to be applied directly to real-world applications.