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A synchronous J avaScript A nd X ML

A synchronous J avaScript A nd X ML. Gloria Law Joshua Mahaz. A synchronous J avaScript A nd X ML. Technique for creating web applications that are… faster more functional real-time Achieved through client/server communication without page reloads. AJAX a New Name.

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A synchronous J avaScript A nd X ML

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  1. AsynchronousJavaScriptAndXML Gloria Law Joshua Mahaz

  2. AsynchronousJavaScriptAndXML • Technique for creating web applications that are… • faster • more functional • real-time • Achieved through client/server communication without page reloads

  3. AJAX a New Name • Components have been around since mid 90’s • Microsoft Remote Scripting • IFRAME (IE3) • LAYER (Netscape 4) • Provided a means of loading external URLs that could modify a parent page.

  4. AJAX a New Name • Requirements • Plugs-ins • Browser specific add-ons • Repercussions • Hassle of third party software • Page was always browser specific

  5. AJAX a New Name • Advancements in Web Development 2000+ • Widespread adoption and refinement of • Client Side Scripting (JavaScript) • Server Side Scripting (PHP/SQL/ASP) • XML Request (Microsoft Remote Scripting) • Aloud for an easier, portable, and more refined approach, AJAX

  6. AsynchronousJavaScriptAndXML • Technique for creating better, faster, and more interactive web application • JavaScript can communicate directly with server • scripting language in which Ajax function calls are usually made • Uses asynchronous data transfer (HTTP requests) between the browser and the web server • Can use on different OS, free and open source implementations of suitable

  7. Usage • Real-time form data validation • Can validate in a form before the user submit the form • Auto completion • Portion of form data may be auto completed as the user types • Load on demand • An HTML page can fetch more data in the background • Refreshing data and server push • Pull data from a server for a up-to-date data • Not require to reload the full page

  8. Advantage • Bandwidth usage • Quicker loads • Rest of the layout does not have to be redrawn on each update • Compatibility • Works on ‘most’ browsers

  9. Advantage • Functionality • Constant data fetching allows page to stay ahead of user • JavaScript event handler gives page a real-time feel • Mouse click • Focus changes • Timers/Interrupts

  10. Disadvantage • Browser Integration • Does not register itself with the browser history engine • Complexity • Need to have some knowledge of presentation logic in the HTML client page as well as in the server-side logic • Response-time concern • Network latency • Debugging • Processing logic is embedded both in the client and on the server.

  11. Demo Web-based demo: http://www.Mahaz.com

  12. Reference • http://www.adaptivepath.com/ideas/essays/archives/000385.php • http://devedge-temp.mozilla.org/viewsource/2003/inner-browsing/index_en.html • http://groups.google.ca/group/microsoft.public.scripting.remote/browse_thread/thread/99b7e6152b45b2e7/6b3689e2dc7401dc • http://arscif.dsi.unimi.it/ • http://msdn.microsoft.com/msdnmag/issues/04/08/CuttingEdge/ • http://www.ietf.org/rfc/rfc2396.txt • http://www.ietf.org/rfc/rfc3986.txt • http://www.xml.com/pub/a/2005/08/22/ajax.html

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