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Introduction to Ajax: Enhancing Web Interactivity Through Asynchronous Communication

This presentation by Scott Marks explores Ajax—a powerful web technology that enables server requests without page reloads by utilizing JavaScript and XMLHttpRequest (XHR) objects. It focuses on how Ajax enhances user interactivity on websites by employing current web standards like XML, HTML, and CSS. Key features discussed include auto-refreshing data, live validation, and in-place editing, exemplified through applications like sports scores and account sign-up. This method leverages existing technologies to create a significantly improved user experience.

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Introduction to Ajax: Enhancing Web Interactivity Through Asynchronous Communication

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Presentation Transcript

  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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