Javascript quick start

Introduction to Javascript (JS)

- JavaScript is a scripting language
- A scripting language is a lightweight programming language
- A JavaScript is usually embedded directly into HTML pages
- JavaScript is an interpreted language (means that scripts execute without preliminary compilation)
- JavaScript was designed to add interactivity to HTML pages
- JavaScript is used in millions of Web pages to improve the design, validate forms, detect browsers, create      cookies, and much more .

Before you continue you should have a basic understanding of the following : HTML / XHTML

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 can put dynamic text into an HTML page - A JavaScript statement like this: document.write(fname + "   " + lname) 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.

Javascript History

Language            :    JavaScript
Official Name            :    ECMAScript
Designed By            :     Brendan Eich
Developer            :    Netscape(ECMA Organisation)
Invented             :    1996
Standard was Approved    :    1998

First and simple Javascript Example 

Create a HelloSaalram.html file and write the given script to write text using JavaScript.

Output: " Hello Saalram! "

Questions ??? Please write us "saalram.service@gmail.com".