Professional Ajax 2nd Edition provides a developer-level tutorial of Ajax techniques, patterns, and use cases. The book begins by exploring the roots of Ajax, covering how the evolution of the web and new technologies directly led to the development of Ajax techniques

Professional Ajax 2nd edition adds nearly 200 pages of new and expanded coverage compared to the first edition. Some of the new topics covered here include:
Ajax Libraries including the Yahoo! Connection Manager, Prototype, and jQuery
Request Management with Priority Queues and the RequestManager Object
Comet push-based web systems and HTTP streaming
Maps and Mashups with Geocoding, Google Maps API and Yahoo! Maps API
Ajax Debugging with FireBug and Microsoft FiddlerASP.NET AJAX Extensions (formerly code-named Atlas)

And of course the Second Edition retains and updates the core first edition content including:
the range of request brokers (including the hidden frame technique, iframes, and XMLHttp) and explains when one should be used over another
different Ajax techniques and patterns for executing client-server communication
Ajax patterns including predictive fetch, page preloading, submission throttling, incremental field and form validation, periodic refresh, multi-stage download and more
Syndication with RSS, Atom, and XParser
JSON and creating an autosuggest textbox example
web site widgets for a news ticker, weather information, web search, and site search
Ajax Frameworks JSpan, DWR, and Ajax.NET Professional
A Web-based RSS/Atom aggregator case study
An AjaxMail case study

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