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Java Script
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What is Java Script?
JavaScript is an object-based scripting language designed primarily
for HTML (Hypertext Markup Language), It supports both IE
(internet Explorer) and Netscape Navigator and all other major
web browser. Java script can be used for both client side as
well as server side in web development. It is not a
programming language it can not create executable code while
compiling, it is embed in document and while pursing the
html document it executes the script, it is an object-based
scripting language, while reasonably simple in syntax,
construction, and features, the object-based nature of JavaScript
still offers programmers significant power and flexibility
through the ability to create functions and new objects.
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1. What is Java Script
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2. Java Script Syntax
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3. Java Script Objects
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4. Java Script Sample Code
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5. Java Script FAQ
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An object in the context of JavaScript, is a collection of
properties and methods consisting a set of defined characteristics
that you can view and modify, and which you
can interact. Methods are the techniques that are used to
perform action involving objects and properties. For example
statement like Document. Write("Welcome to Javascript")
here Document is the object, Write is the method of Document
object, JavaScript follows event driven sequence. the events
determine the program flow and event handlers determine what
happen when these event occurs.
Where to Write Java Script
You can write javascript in body or head section depend
on your requirement or you can write java script in a
sepeate file with extension ".js" and includes it
in your HTML document with <SCRIPT SOURCE="abc.js">
tag.
1. Writing text on the browser window
<html>
<body>
<script language="JavaScript">
document.write("Hello World!")
</script>
</body>
</html>
2. Writing Formatted Text on the Browser
<html>
<body>
<script language="Java Script">
document.write("<h1>Hello World!</h1>")
</script>
</body>
</html>
3. Using HEAD Section
<html>
<head>
<script language="JavaScript">
function message(){
alert("This alert box was called with the onload event")
}
</script>
</head>
<body onload="message()">
</body>
</html>
4. Using BODY Section
<html>
<head>
</head>
<body>
<script language="JavaScript">
document.write("This message is written when the page loads")
</script>
</body>
</html>
<!--Example E Using External script -->
<html>
<head>
</head>
<body>
<script src="myscript.js">
</script>
<p>The actual script is in an external script file called "myscript.js".</p>
</body>
</html>
Try yourself.
1. Load any text editor (Notepad, WordPad, Word, TextPlus)
2. Create the HTML file and save it, with .HTM or .HTML extension.
and write following HTML and javascrpt.
<html>
<body>
<script language="JavaScript">
document.write("Hello to JavaScript World!")
</script>
</body>
</html>
3. Open saved file in Browser (IE, Netscape) to view it will display
Hello to JavaScript World!.
Java Script Resource
1. www.w3.org
2. www.w3school.com
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2. Java Script Syntax
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