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ajax_lecture1 - Rapid Application Web Development Lecture 1...

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Rapid Application Web Development Fall 2006 Dr. McDaniel Lecture 1: AJAX
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Announcements Office hours for today are cancelled. If you need to schedule office hours this week, send me an email and we’ll set up an appointment. No class next week (Labor Day). Check your email or the WebCT discussion boards for the book you need to purchase for the course. Programming assignment 1 has been posted to WebCT. Read the instructions carefully!
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AJAX AJAX is shorthand for A synchronous J avaScript a nd X ML AJAX is not a programming language! It is more like a framework or methodology. Although the technologies supporting AJAX have been around for years, recent Web applications have popularized its techniques: e.g. Gmail , Google Maps , Google Suggest , Flikr , MySpace , etc.
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AJAX Components Ajax is based upon the following technologies: JavaScript HTML CSS XML (or alternate format like JSON: JavaScript Object Notation) Ajax is cross-browser, cross-platform compatible (if implemented correctly). Ajax applications rely both on client- side and server-side technologies.
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Fundamental Concepts of AJAX Two features in particular make the AJAX framework very powerful: 1. The ability to make requests to a server without reloading the page. 2. The ability to easily parse and work with XML documents. What are XML documents?
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What is AJAX Used For? AJAX can be used for: Building dynamic applications with less load on server-side processing In addition, the AJAX framework supports: Communication with databases Communication with XML/JSON files Proposed benefits of AJAX are: 1. Increased speed 2. Better usability 3. Better interactivity
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How does AJAX Work? AJAX uses XML and HTTP requests. Basically, the HTTP request is sent to the server using JavaScript. Data is then returned in XML format. To enable this functionality, we need an interface that supports this behavior.
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