1. MSc. Publishing on WWW JavaScript

2. What is JavaScript? A scripting language devised by Netscape Adds functionality to web pages by: Embedding code into HTML (client side) Providing processing features (server side) Object oriented NOT Java

3. Features of JavaScript Usually embedded in the HTML Generally browser independent Event driven Interpreted scripting language

4. Uses of JavaScript Frame control Data validation Rollovers, drop down menus Graphics effects – animation etc.

5. JavaScript Terminology Interact with computer or applications by pressing keys Trigger events which cause things to happen Events are associated with code JavaScript is: Event driven Uses event handlers

6. Where to Put JavaScript Within tags Attached directly to event handlers Create functions (small programs)

7. Within Tags Simplest method. Place in of a web doc using the tag. alert(“Hello world”)

8. Attached to Handler Can be attached to an event handler of an HTML object e.g. a FORM button Will run when the event occurs. Example

9. Functions Functions can be written and placed in the of a document. Runs either: When called within tags When attached to an HTML object in

10. Example function hello() {alert("Hello World")} A Sample JavaScript A Simple JavaScript Example hello()