Doris AJAX presentation for singapore

Web-tier Programming Codecamp II : AJAX Inyoung Cho Technology Evangelist Sun Microsystems, Inc. Goal Learn how to architect and build rich web applications using AJAX and J2EE™ technologies. Agenda •What is AJAX? •AJAX Anatomy •AJAX Guidelines •AJAX Consideration and Gotchas •Strategies and Best Practices: >AutoComplete Using a Servlet >AutoComplete Using a JSF Component •AJAX Issues & Futures •Summary and Resources What is AJAX? Conventional Rich Web Application •Click, wait, and refresh user interaction >Page refreshes from the server needed for

all events, data submissions, and navigation >Lost of operation context during refresh >Excessive server load and bandwidth consumption •Synchronous “request/response” communication model >Browser always initiates the request >The user has to wait for the response -- Slow response •Lack of two-way, real-time communication capability for server initiated updates •Plugins, applets, or browser black magic What is AJAX •AJAX is an acronym for Asynchronous Javascript And XML >AJAX uses JavaScript combined with xml to grab information from a server without refreshing the page >nothing new, the main requirement is the web browser has the support for XMLHttpRequest object >The term AJAX was coined Jesse James Garrett in February 2005 •Advantages on web apps: >Dramatic improvement in user interface >"Partial screen update" replaces the "click, wait, and refresh" user interaction model User Interface: Traditional Web vs. AJAX Components: Traditional Web vs. AJAX Examples of AJAX apps •Google maps http://maps.google.com/ •Zimbra: demo at http://www.zimbra.com •Goold Suggest http://www.google.com/webhp?complete=1&hl=en •ZUGGEST- an XMLHttp Experiment using Amazon http://www.francisshanahan.com/zuggest.aspx •Mashup housing want-ads (craglist.org)with Google maps http://www.housingmaps.com/ Usage cases for AJAX •Real-time form data validation >user IDs, serial numbers, postal codes, or even special coupon codes that require server-side validation can be validated in a form before the user...

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