Chapter: Web or internet Programming : Scripting Elements

JavaScript

JavaScript was designed to add interactivity to HTML pages

JavaScript

• JavaScript was designed to add interactivity to HTML pages

• JavaScript is a scripting language

• A scripting language is a lightweight programming language

• JavaScript is usually embedded directly into HTML pages

• JavaScript is an interpreted language (means that scripts execute without preliminary compilation)

• Everyone can use JavaScript without purchasing a license

Purpose

• JavaScript gives HTML designers a programming tool - HTML authors are normally not programmers, but JavaScript is a scripting language with a very simple syntax! Almost anyone can put small "snippets" of code into their HTML pages

• JavaScript can put dynamic text into an HTML page - A JavaScript statement like this: document.write("<h1>" + name + "</h1>") can write a variable text into an HTML page

• JavaScript can react to events - A JavaScript can be set to execute when something happens, like when a page has finished loading or when a user clicks on an HTML element

• JavaScript can read and write HTML elements - A JavaScript can read and change the content of an HTML element

• JavaScript can be used to validate data - A JavaScript can be used to validate form data before it is submitted to a server. This saves the server from extra processing

• JavaScript can be used to detect the visitor's browser - A JavaScript can be used to detect the visitor's browser, and - depending on the browser - load another page specifically designed for that browser

• JavaScript can be used to create cookies - A JavaScript can be used to store and retrieve information on the visitor's computer

Example

<html>

<body>

</html>

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Web or internet Programming : Scripting Elements : JavaScript |