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Ajax: Asynchronous JavaScript and XML

Ajax: Asynchronous JavaScript and XML. Scott Marks CNT 4104 - Computer Network Programming Florida Gulf Coast University Fort Myers, Florida October 24, 2008. Introduction. Server requests without page reloads Read XML databases Not a new programming or scripting language

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Ajax: Asynchronous JavaScript and XML

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  1. Ajax: Asynchronous JavaScript and XML Scott Marks CNT 4104 - Computer Network Programming Florida Gulf Coast University Fort Myers, Florida October 24, 2008

  2. Introduction • Server requests without page reloads • Read XML databases • Not a new programming or scripting language • Uses current web standards: • JavaScript, XML, HTML, DOM, CSS

  3. Details of the Technology (1/2) • Centers around the XMLHttpRequest (XHR) object • Handles communication with the server • Uses GET or POST • Newer browsers have direct support for the XHR object • IE 6 uses an ActiveX object

  4. Details of the Technology (2/2) • The asynchronous aspect permits page refreshing without the user seeing a page reload • Multithreading is not supported but should be considered during development • Possible that an Ajax program can break the browser’s navigation button • Example: slide shows

  5. Outline of a Programming Example • Data auto-refresh • Example: sports scores and in-place editing • Live validation • Example: account sign-up • Suggestions • Example: Google Suggest

  6. Conclusion • A new method of using old technologies • Permits extensive website interactivity • Can offer a significantly better user experience • Easy to learn the basics

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