JavaScript & Introduction to AJAX 2006.05.11

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Copyright © 2004 ProsoftTraining, All Rights Reserved. Lesson 11: Advanced Web Technologies.

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Presentation transcript:

JavaScript & Introduction to AJAX

Introduction to JavaScript The most popular scripting language used in Web pages. Most web browser support it. But….  The function support and object definition differ between browsers and versions.  It’s not JAVA.

Introduction to JavaScript Where to write it:  In the HTML …  Or include it  At some web object’s action

Introduction to JavaScript Hello World!  Alert(“Hello world!!”); Debug friend  Alert(“Debug message.”);  Mark part of code you think might have problem.

Why do we need JavaScript? DHTML  Dynamically update the web page. Without reload the hole page. Data validation  Check user input data before sending. Do some work at client side  Some web based tool even application.

The reference documents Netscape  ascript/ ascript/ Resources listed by mozilla (ECMA)  MSDN (JScript)  ary/en-us/script56/html/b7a0a54e-dfaa-4e41-bf25- bcaa43e601fb.asp ary/en-us/script56/html/b7a0a54e-dfaa-4e41-bf25- bcaa43e601fb.asp

What’s AJAX? Asynchronous JavaScript And XML How it works?  Using XHTML(HTML), CSS, for marking up and styling information.  DOM?  Special Object: Mozilla: XMLHttpReques IE: ActiveXObject("Microsoft.XMLHTTP")  XML?