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MSc. Publishing on WWW JavaScript
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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
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Features of JavaScript Usually embedded in the HTML Generally browser independent Event driven Interpreted scripting language
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Uses of JavaScript Frame control Data validation Rollovers, drop down menus Graphics effects – animation etc.
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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
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Where to Put JavaScript Within tags Attached directly to event handlers Create functions (small programs)
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Within Tags Simplest method. Place in of a web doc using the tag. alert(“Hello world”)
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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
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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
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Example function hello() {alert("Hello World")} A Sample JavaScript A Simple JavaScript Example hello()
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