Chapter: Web Technology : Style Sheets: CSS

Introduction to Java Script

What is JavaScript? JavaScript was designed to add interactivity to HTML pages JavaScript is a scripting language

INTRODUCTION TO JAVA SCRIPT

What is JavaScript?

JavaScript was designed to add interactivity to HTML pages JavaScript is a scripting language

A scripting language is a lightweight programming language A JavaScript consists of lines of executable computer code A 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

Are Java and JavaScript the Same?

NO!

Java and JavaScript are two completely different languages in both concept and design!

Java (developed by Sun Microsystems) is a powerful and much more complex programming language - in the same category as C and C++.

What can a JavaScript Do?

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 detect the visitor's browser, and - depending on the 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

BASIC SYNTAX

How to Put a JavaScript Into an HTML Page

<html>

<body>

HTML Comments to Handle Simple Browsers

Browsers that do not support JavaScript will display JavaScript as page content.

To prevent them from doing this, and as a part of the JavaScript standard, the HTML comment tag can be used to "hide" the JavaScript. Just add an HTML comment tag  (end of comment) after the last JavaScript statement.

<html>

<body>

document.write("Hello World!"); //-->

</script>

</body>

</html>

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Web Technology : Style Sheets: CSS : Introduction to Java Script |