JavaScript Introduction

Java Script
• Scripting Language
• Dynamic Web pages requires User
Inputs and structure webpage contents
dynamically.
• Its an Interpreted Programming
Language
• Its an Object Oriented Programming
Language & Event Driven

Java Script
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Client Side & Server Side
Creates Dynamic Webpages
Netscape has introduced (Live Script)
In 1995 SUN microsystems took over
To be inserted into HTML page
An Open & Cross platform application

Java Script
•
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Dynamic Text into HTM page
Response to Events
Read and Write HTML elements
Validate Data

Java Script
<html>
<body>
<script type="text/javascript">
document.write("Hello World!")
</script>
</body>
</html>

;

Java Script
<html>
<body>
document.write(“<B> Hello World! <B>");
<!– this is comments for the javascript //-->

// Single Line Comments
/* Multi Line Comments ….*/
</script>
</body>
</html>

Java Script
<html>
<head>
<script src="xxx.js">
</script>
</head>
<body>
</body>
</html>

Java Script
Variables
var x;
var carname;
var x=5;
var carname="Volvo";

Java Script
Expression Writing
Y = X - 5;
Z = Y + 5;

Java Script
<html>
<body>
x=5+5;
document.write(x);
document.write("<br />");

Java Script
x="5"+"5";
document.write(x);
x=5+"5";
document.write(x);

Java Script
x="5"+5;
document.write(x);
</script>
The common rule is: If you add a
number and a string, the result will
be a string.

Java Script
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Arithmetic Operator
Short hand Operator
Comparison Operator
Logical Operator
Conditional (Ternary) Operator

Java Script
•
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Conditional Statements
if statement
if…else statement
Nested if…else statements
switch case statement

JavaScript Introduction

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JavaScript Introduction