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JS Basic

JS HOME

JS Introduction

JS How To

JS Where To

JS Statements

JS Comments

JS Variables

JS Operators

JS Comparisons

JS If...Else

JS Switch

JS Popup Boxes

JS Functions

JS For Loop

JS While Loop

JS Break Loops

JS For...In

JS Events

JS Try...Catch

JS Throw

JS Special Text

JS Guidelines

JS Objects

JS Objects Intro

JS String

JS Date

JS Array

JS Boolean

JS Math

JS RegExp

JS Advanced

JS Browser

JS Cookies

JS Validation

JS Animation

JS Image Maps

JS Timing

JS Create Object

JS Summary

JS Examples

JS Objects Examples

JS Browser Examples

JS HTML DOM Examples

JS Quiz

JS Exam

JS References

JavaScript Objects

HTML DOM Objects

JavaScript Tutorial

« W3Schools Home Next Chapter »

JavaScript is THE scripting language of the Web.

JavaScript is used in millions of Web pages to add

functionality, validate forms, detect browsers, and much more.

Start learning JavaScript now!

Examples in Each Chapter

This JavaScript tutorial contains more than 200 examples!

With our online editor, you can edit the JavaScript code, and click on a button to view the result.

Example

<html>

<body>

document.write("This is my first JavaScript!");

</script>

</body>

</html>

Try it yourself »

Click on the "Try it Yourself" button to see how it works.

JavaScript Examples

Learn by 200 examples!

With our editor, you can edit the

source code, and click on a test button to view the result.

JavaScript Examples

•

JavaScript Objects Examples

•

JavaScript Browser Objects Examples

•

JavaScript HTML DOM Examples

•

JavaScript Quiz Test

Test your JavaScript skills at W3Schools!

Start JavaScript Quiz!

JavaScript References

At W3Schools you will find a complete reference of all JavaScript objects, Browser objects, and the

HTML DOM ob

ects. Contains lot of examples!

JavaScript Built-in objects

•

Browser objects

•

HTML DOM objects

•

JavaScript Exam - Get Your Diploma!

W3Schools' Online Certification Program

The perfect solution for professionals who need to balance

work, family, and career building.

More than 5000 certificates already issued!

The HTML Certificate documents your knowledge of HTML, XHTML, and CSS.

The JavaScript Certificate documents your knowledge of JavaScript and HTML DOM.

The XML Certificate documents your knowled

e of XML, XML DOM and XSLT.

The ASP Certificate documents your knowledge of ASP, SQL, and ADO.

The PHP Certificate documents your knowled

e of PHP and SQL (MySQL).

« W3Schools Home Next Chapter »

JS Basic

JS HOME

JS Introduction

JS How To

JS Where To

JS Statements

JS Comments

JS Variables

JS Operators

JS Comparisons

JS If...Else

JS Switch

JS Popup Boxes

JS Functions

JS For Loop

JS While Loop

JS Break Loops

JS For...In

JS Events

JS Try...Catch

JS Throw

JS Special Text

JS Guidelines

JS Objects

JS Objects Intro

JS String

JS Date

JS Array

JS Boolean

JS Math

JS RegExp

JS Advanced

JS Browser

JS Cookies

JS Validation

JS Animation

JS Image Maps

JS Timing

JS Create Object

JS Summary

JS Examples

JS Objects Examples

JS Browser Examples

JS HTML DOM Examples

JS Quiz

JS Exam

JS References

JavaScript Objects

HTML DOM Objects

JavaScript Introduction

« Previous Next Chapter »

JavaScript is the most popular scripting language on the internet, and works in all

major browsers, such as Internet Explorer, Firefox, Chrome, Opera, and Safari.

What You Should Already Know

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

HTML / XHTML•

If you want to study these subjects first, find the tutorials on our Home page.

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•

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 - 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

•

The Real Name is ECMAScript

JavaScript's official name is ECMAScript.

ECMAScript is developed and maintained by the ECMA organization.

ECMA-262 is the official JavaScript standard.

The language was invented by Brendan Eich at Netscape (with Navigator 2.0), and has appeared in

all Netscape and Microsoft browsers since 1996.

The development of ECMA-262 started in 1996, and the first edition of was adopted by the ECMA

General Assembly in June 1997.

The standard was approved as an international ISO (ISO/IEC 16262) standard in 1998.

The development of the standard is still in progress.

« Previous Next Chapter »

JS Basic

JS HOME

JS Introduction

JS How To

JS Where To

JS Statements

JS Comments

JS Variables

JS Operators

JS Comparisons

JS If...Else

JS Switch

JS Popup Boxes

JS Functions

JS For Loop

JS While Loop

JS Break Loops

JS For...In

JS Events

JS Try...Catch

JS Throw

JS Special Text

JS Guidelines

JS Objects

JS Objects Intro

JS String

JS Date

JS Array

JS Boolean

JS Math

JS RegExp

JS Advanced

JS Browser

JS Cookies

JS Validation

JS Animation

JS Image Maps

JS Timing

JS Create Object

JS Summary

JS Examples

JS Objects Examples

JS Browser Examples

JS HTML DOM Examples

JS Quiz

JS Exam

JS References

JavaScript Objects

HTML DOM Objects

JavaScript How To

« Previous Next Chapter »

The HTML <script> tag is used to insert a JavaScript into an HTML page.

Put a JavaScript into an HTML page

The example below shows how to use JavaScript to write text on a web page:

Example

<html>

<body>

document.write("Hello World!");

</script>

</body>

</html>

Try it yourself »

The example below shows how to add HTML tags to the JavaScript:

Example

<html>

<body>

document.write("<h1>Hello World!</h1>");

</script>

</body>

</html>

Try it yourself »

Example Explained

To insert a JavaScript into an HTML page, we use the <script> tag. Inside the <script> tag we use

the type attribute to define the scriptin

lan

So, the <script type="text/javascript"> and </script> tells where the JavaScript starts and ends:

<html>

<body>

...

</script>

</body>

</html>

The document.write command is a standard JavaScript command for writing output to a page.

By entering the document.write command between the <script> and </script> tags, the browser

will recognize it as a JavaScript command and execute the code line. In this case the browser will

write Hello World! to the pa

<html>

<body>

document.write("Hello World!");

</script>

</body>

</html>

Note: If we had not entered the <script> tag, the browser would have treated the document.write

("Hello World!") command as pure text, and

ust write the entire

line on the pa

ry it

yourself

How 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

should be used to "hide" the JavaScript.

Just add an HTML comment tag  (end of

comment) after the last JavaScript statement, like this:

<html>

<body>

<!--

document.write("Hello World!");

//-->

</script>

JS Basic

JS HOME

JS Introduction

JS How To

JS Where To

JS Statements

JS Comments

JS Variables

JS Operators

JS Comparisons

JS If...Else

JS Switch

JS Popup Boxes

JS Functions

JS For Loop

JS While Loop

JS Break Loops

JS For...In

JS Events

JS Try...Catch

JS Throw

JS Special Text

JS Guidelines

JS Objects

JS Objects Intro

JS String

JS Date

JS Array

JS Boolean

JS Math

JS RegExp

JS Advanced

JS Browser

JS Cookies

JS Validation

JS Animation

JS Image Maps

JS Timing

JS Create Object

JS Summary

JS Examples

JS Objects Examples

JS Browser Examples

JS HTML DOM Examples

JS Quiz

JS Exam

JS References

JavaScript Objects

HTML DOM Objects

JavaScript Where To

« Previous Next Chapter »

JavaScripts can be put in the body and in the head sections of an HTML page.

Where to Put the JavaScript

JavaScripts in a page will be executed immediately while the page loads into the browser. This is

not always what we want. Sometimes we want to execute a script when a page loads, or at a later

event, such as when a user clicks a button. When this is the case we put the script inside a function,

you will learn about functions in a later chapter.

Scripts in <head>

Scripts to be executed when they are called, or when an event is triggered, are placed in functions.

Put your functions in the head section, this way they are all in one place, and they do not interfere

with page content.

Example

<html>

<head>

function message()

{

alert("This alert box was called with the onload event");

}

</script>

</head>

</body>

</html>

Try it yourself »

Scripts in <body>

If you don't want your script to be placed inside a function, or if your script should write page

content, it should be placed in the body section.

Example

<html>

<head>

</head>

<body>

document.write("This message is written by JavaScript");

</script>

</body>

</html>

Try it yourself »

Scripts in <head> and <body>

You can place an unlimited number of scripts in your document, so you can have scripts in both the

body and the head section.

Example

<html>

<head>

function message()

{

alert("This alert box was called with the onload event");

}

</script>

</head>

document.write("This message is written by JavaScript");

</script>

</body>

</html>

Try it yourself »

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