Java script

JavaScript
was developed by Netscape, was originally named Mocha but soon was renamed LiveScript
In late 1995 Live Script became a joint venture of Netscape and Sun Microsystems, then
renamed as JavaScript.
What is JavaScript
JavaScript is a lightweight, interpreted programming language
Designed for creating network-centric applications
Complementary to and integrated with Java
Complementary to and integrated with HTML
Open and cross-platform
JavaScript is loosely based on Java and it is built into all the major modern browsers.

JavaScript can be divided into three parts:
1. the core JavaScript
2. client side JavaScript
3. server side JavaScript
the core JavaScript : is the heart of the language, it includes operators,
expressions, statements, and subprograms.
client side JavaScript: is a collection of objects that support the control of a
browser and interactions with users
Server-side JavaScript : is a collection of objects that make the language useful on a
Web server

difference between Java and JavaScript
The two languages are completely unrelated. they could hardly be more different
Java is a object-oriented languages; Java Script is Object-based Language.
Java is strongly typed, while JavaScript is weakly typed.
JavaScript has first-class functions; Java lacks them.
Java is class-based; JavaScript is prototype-based.
Java is distributed as compiled bytecode; JavaScript is distributed in its source
code.

JavaScript Syntax
A JavaScript consists of JavaScript statements that are placed within the <script>...
</script> HTML tags in a web page.
The <script> tag alert the browser program to begin interpreting all the text
between these tags as a script.
<script language="JavaScript" type="text/ javascript">
JavaScript code
</script>
It as two important attributes:
language: This attribute specifies what scripting language you are using.
type: This attribute is what is now recommended to indicate the scripting language
in use and its value should be set to "text/javascript".

Where to put the java Script
JavaScripts in a page will be executed immediately while the page loads into the
browser.
You can put javascript any where in the document.
Scripts in the header section: scripts to be executed when they are called,or
when an event is trigged.
<html>
<head>
<script type=“text/javascript”>
---------
</script>
</head>
</html>

Scripts in the body section: scripts to be executed when the page loads.
<html>
<head>
<body>
………..
</script>
</body>
</html>
Scripts in both body and header section: you can place an unlimited number of
scripts in your document.
We can also write java script in a separate file with .js extension. To call external
javascript file we use an attribute in script tag that is src.

JavaScript Datatypes
JavaScript allows
three primitive data types
1.Numbers eg. 123, 120.50 etc.
2.Strings of text e.g. "This text string" etc.
3.Boolean e.g. true or false.
two trivial data types
1.null
2.undefined

JavaScript Variables
Variables is a container for information you want to store.
Rules for variable names
Variable name are case sensitive.
They must begin with letter or underscore character.
should not use any of the JavaScript reserved keyword as variable name.
Declaring a Variables : variable are declared using var keyword.
example: var money;
here semicolon is optional.
You can also create a variable without var statement.
money=100;

Assigning value to variable
Var strname=“hello”
OR
Strname=“hello”
Variable Scope
The scope of a variable is the region of your program in which it is defined.
JavaScript variable will have only two scopes.
1. Global Variables: A global variable has global scope which means it is
defined everywhere in your JavaScript code.
2. Local Variables: A local variable will be visible only within a function
where it is defined. Function parameters are always local to that function.

JavaScript Reserved Words
They cannot be used as JavaScript variables, functions, methods, loop labels, or any object names

Arithmetic Operators supported by JavaScript
+ Adds two operands
- Subtracts second operand from the first
* Multiply both operands
/ Divide numerator by denumerator
% Modulus Operator and remainder of after an integer division .
Comparison Operators supported by JavaScript
==,>,<,>=,=<
Logical Operators supported by JavaScript
&& (Logical AND ),|| (Logical OR),! (Logical NOT)
Bitwise Operators supported by JavaScript
&(Bitwise AND ),|(Bitwise OR), ^ (Bitwise XOR) , ~ (Bitwise NOT)

Assignment Operators supported by JavaScript
= , += , -= , *= , /= , %=
Conditional Operator
typeof Operator
The typeof is a unary operator that is placed before its single operand, which
can be of any type. Its value is a string indicating the data type of the operand.

Control statements
if statement
Syntax
if (expression){
Statement(s) to be executed if expression is true
}
if...else statement
Syntax
if (expression){
}else{
Statement(s) to be executed if expression is false
}

if...else if... Statement
Syntax
if (expression 1)
{
Statement(s) to be executed if expression 1 is true
}else if (expression 2)
{
}else if (expression 3)
{
}else
{
Statement(s) to be executed if no expression is true

switch statement
Syntax
switch (expression)
{
case condition 1: statement(s)
break;
case condition 2: statement(s)
break;
...
case condition n: statement(s)
break;
default: statement(s)
}

Java Script Popup Boxes
Alert Box
An alert dialog box is mostly used to give a warning message to the users.
<head>
<script type="text/javascript">

</script>
</head>

Confirmation Dialog Box
A confirmation dialog box is mostly used to take user's consent on any option. It
displays a dialog box with two buttons: OK and Cancel.
<script language="javascript">
function respond()
{
var retVal = confirm("are u sure to continue");
if(retVal == true)
{
window.location="../first.html";
}
else{alert("you have canceled the redirection");}
}
</script>

Prompt Dialog Box
Prompt bob is often used if you want the user to input a value before entering a
page
<head>

</script>
</head>

Java Script Functions
The most common way to define a function in JavaScript is by using the function
keyword, followed by a unique function name, a list of parameters (that might be
empty), and a statement block surrounded by curly braces.

</script>
A function contain some code that will be executed only by an event or a call to
that function.

example
<html>
<head>
function displaymessage()
{
alert(“hello world”);
}
</script>
</head>
<body>
<form>
<input type=“button” value=“clickme” onclick=“displaymessage()”>
</form>
</body>
</html>

JavaScript loops
while Loop
while (expression){
}
do...while Loop
do{
Statement(s) to be executed;
} while (expression);
for Loop
for (initialization; test condition; iteration statement)
{
Statement(s) to be executed if test condition is true
}
for...in Loop
for (variablename in object)
{
statement or block to execute
}

Events
Every element on a web page has certain Events which can trigger javascript
functions.
Example of events
1.A mouse clicks
2.A web page loading or an image loading
3.Mouse over a hot spot on the web page
4.selecting an input box in an HTML form
5.submitting an HTML form
6.A key Stroke.
Types of events
1.Window Events(Onload and onunload )
2.Form Events(OnFocus ,onBlur and onChange,onsubmit)
3. Keyboard Events(onkeydown, onkeypress, onkeyup)
4. Mouse Events(onMouseOver and onMouseOut)

Onload and onunload events
• The onload and onunload events are trigged when the unters or
leaves the page.
• The onload attribute can be used to check the visitor's browser type
and browser version, and load the proper version of the web page
based on the information.
• Syntax
• <element onload="script">

OnFocus ,onBlur and onChange
onFocus: The onfocus attribute fires the moment that the element gets focus.
onBlur: The onblur attribute fires the moment that the element loses focus.
onChange :The onchange attribute fires the moment when the value of the element is
changed.
These events are often used in combination with validation of form fields.
Syntax
<element onfocus="script">
<element onblur="script">
<element onchange="script">

onsubmit
The onsubmit attribute fires when a form is submitted.
The onsubmit event is used to validate all form fields before submitting it.
Syntax
<form onsubmit="script">

onkeydown, onkeypress, onkeyup
The onkeydown attribute fires when the user is pressing a key.
The onkeypress attribute fires when the user presses a key.
The onkeyup attribute fires when the user releases a key.
syntax
<element onkeydown=" script " onkeypress=" script " onkeyup=" script ">

onMouseOver and onMouseOut
The onmouseover attribute fires when the mouse pointer moves over an element.
Syntax
<element onmouseover="script">
The onmouseout attribute fires when the mouse pointer moves out of an element.
syntax
<element onmouseout="script">

Objects in JavaScript
1. Array object
2. String object
3. Math object
4. Date object

Arrays
An array is a special variable, which can hold more than one value, at a time.
An array can be defined in three ways.
The following code creates an Array object called myCars:
1:
var myCars=new Array(); // regular array
myCars[0]="Saab";
myCars[1]="Volvo";
myCars[2]="BMW";
2:
var myCars=new Array("Saab","Volvo","BMW");
3:
var myCars=["Saab","Volvo","BMW"];

Access an Array
• The following code line:
• document. write(myCars[0]);will result in the following output:
Saab

Modify Values in an Array
• To modify a value in an existing array, just add a new value to the
array with a specified index number:
• myCars[0]="Opel";
• Now, the following code line:
• document.write(myCars[0]);
• will result in the following output:
Opel

Predefined methods
Join two arrays - concat()
<html>
<body>
var parents = ["Jani", "Tove"];
var children = ["Cecilie", "Lone"];
var family = parents.concat(children);
document.write(family);
</script>
</body>
</html>

Code for joining three arrays
<html>
<body>
var parents = ["Jani", "Tove"];
var brothers = ["Stale", "Kai Jim", "Borge"];
var children = ["Cecilie", "Lone"];
var family = parents.concat(brothers, children);
document.write(family);
</script>
</body>
</html>

Join all elements of an array into a string - join()
<html>
<body>
var fruits = ["Banana", "Orange", "Apple", "Mango"];
document.write(fruits.join() + "<br />");
document.write(fruits.join("+") + "<br />");
document.write(fruits.join(" and "));
</script>
</body>
</html>

Remove the last element of an array - pop()
<html>
<body>
document.write(fruits.pop() + "<br />");
document.write(fruits + "<br />");
document.write(fruits.pop() + "<br />");
document.write(fruits);
</script>
</body>
</html>

Add new elements to the end of an array - push()
<html>
<body>
var fruits = ["Banana", "Orange", "Apple", "Mango","ramana"];
document.write(fruits.push("Kiwi") + "<br />");
document.write(fruits.push("Lemon","Pineapple") + "<br />");
document.write(fruits);
</script>
</body>
</html>

Reverse the order of the elements in an array - reverse()
<html>
<body>
document.write(fruits.reverse());
</script>
</body>
</html>

Sort an array (alphabetically and ascending) - sort()
<html>
<body>
document.write(fruits.sort());
</script>
</body>
</html>

String Object
The String object is used to manipulate a stored piece of text.
String objects are created with new String()
Syntax:
var txt = new String(string);
or more simply:
var txt = string;

String Object Properties
Length Returns the length of a string
Return the number of characters in a string
<script type="text/JavaScript">
var txt = "Hello World!";
document.write(txt.length);
</script>

String Object Methods
Method
charAt(): Returns the character at the specified index
Example:
Return the first and last character of a string:
var str = "Hello world!";
document.write("First character: " + str.charAt(0) + "<br />");
document.write("Last character: " + str.charAt(str.length-1));
</script>

charCodeAt():Returns the Unicode of the character at the specified index
Return the Unicode of the first and last character in a string:
var str = "Hello world!";
document.write("First character: " + str.charCodeAt(0) + "<br />");
document.write("Last character: " + str.charCodeAt(str.length-1));
</script>

concat():Joins two or more strings, and returns a copy of the joined strings
Join two strings:
var str1="Hello ";
var str2="world!";
document.write(str1.concat(str2));
</script>

fromCharCode() Converts Unicode values to characters
syntax:
String.fromCharCode(n1, n2, ..., nX)
Convert Unicode values to characters:
document.write(String.fromCharCode(72,69,76,76,79));
</script>

indexOf():Returns the position of the first found occurrence of a specified value in
a string
var str="Hello world!";
document.write(str.indexOf("d") + "<br />");
document.write(str.indexOf("WORLD") + "<br />");
document.write(str.indexOf("world"));
</script>

lastIndexOf():Returns the position of the last found occurrence of a specified value
in a string
document.write(str.lastIndexOf("d") + "<br />");
document.write(str.lastIndexOf("WORLD") + "<br />");
document.write(str.lastIndexOf(“l"));
</script>

toLowerCase():Converts a string to lowercase letters
var str="Hello World!";
document.write(str.toLowerCase());
</script>
toUpperCase():Converts a string to uppercase letters
document.write(str.toUpperCase());
</script>

substr():Extracts the characters from a string, beginning at a specified start
position, and through the specified number of character
document.write(str.substr(3)+"<br />");
document.write(str.substr(3,4));
</script>

replace():Searches for a match between a substring (or regular expression) and a
string, and replaces the matched substring with a new substring
var str="Visit Microsoft!";
document.write(str.replace("Microsoft", “jntu"));
</script>

String HTML Wrapper Methods
The HTML wrapper methods return the string wrapped inside the appropriate
HTML tag.
big() Displays a string using a big font
blink() Displays a blinking string
bold() Displays a string in bold

fontcolor() Displays a string using a specified color
fontsize() Displays a string using a specified size
italics() Displays a string in italic
small() Displays a string using a small font
strike() Displays a string with a strikethrough
link() Displays a string as a hyperlink
sub() Displays a string as subscript text
sup() Displays a string as superscript text

<html>
<body>
var txt = "Hello World!";
document.write("<p>Big: " + txt.big() + "</p>");
document.write("<p>Small: " + txt.small() + "</p>");
document.write("<p>Bold: " + txt.bold() + "</p>");
document.write("<p>Italic: " + txt.italics() + "</p>");
document.write("<p>Strike: " + txt.strike() + "</p>");
document.write("<p>Fontcolor: " + txt.fontcolor("green") + "</p>");
document.write("<p>Fontsize: " + txt.fontsize(6) + "</p>");
document.write("<p>Subscript: " + txt.sub() + "</p>");
document.write("<p>Superscript: " + txt.sup() + "</p>");
document.write("<p>Link: " + txt.link("http://www.w3schools.com") + "</p>");
document.write("<p>Blink: " + txt.blink() + " (does not work in IE, Chrome, or Safari)</p>");
</script>
</body>
</html>

Math Object
The Math object allows you to perform mathematical tasks.
All properties/methods of Math can be called by using Math as an object, without
creating it.
Syntax:
var x = Math.PI; // Returns PI
var y = Math.sqrt(16); // Returns the square root of 16

Math Object Methods
abs(x):Returns the absolute value of x
document.write(Math.abs(7.25) + "<br />");
document.write(Math.abs(-7.25) + "<br />");
document.write(Math.abs(null) + "<br />");
document.write(Math.abs("Hello") + "<br />");
document.write(Math.abs(2+3));
</script>

ceil(x):Returns x, rounded upwards to the nearest integer
document.write(Math.ceil(0.60) + "<br />");
document.write(Math.ceil(5) + "<br />");
document.write(Math.ceil(-5.1) + "<br />");
document.write(Math.ceil(-5.9));
</script>

cos(x):Returns the cosine of x
document.write(Math.cos(3) + "<br />");
document.write(Math.cos(-3) + "<br />");
document.write(Math.cos(0) + "<br />");
document.write(Math.cos(Math.PI) + "<br />");
document.write(Math.cos(2*Math.PI));
</script>

exp(x):Returns the value of E
document.write(Math.exp(1) + "<br />");
document.write(Math.exp(-1) + "<br />");
</script>

floor(x):Returns x, rounded downwards to the nearest intege
document.write(Math.floor(0.60) + "<br />");
document.write(Math.floor(5) + "<br />");
document.write(Math.floor(-5.1) + "<br />");
document.write(Math.floor(-5.9));
</script>

log(x):Returns the natural logarithm (base E) of x
document.write(Math.log(2.7183) + "<br />");
document.write(Math.log(2) + "<br />");
document.write(Math.log(-1));
</script>

max(x,y,z,...,n):Returns the number with the highest value
min(x,y,z,...,n): Returns the number with the lowest value
document.write(Math.max(5,10) + "<br />");
document.write(Math.max(0,150,30,20,38) + "<br />");
document.write(Math.max(-5,10) + "<br />");
document.write(Math.max(-5,-10) + "<br />");
document.write(Math.max(1.5,2.5));
</script>

Pow(x,y):Returns the value of x to the power of y
document.write(Math.pow(0,0) + "<br />");
document.write(Math.pow(-7,2) + "<br />");
document.write(Math.pow(2,4));
</script>

random():Returns a random number between 0 and 1
//return a random number between 0 and 1
document.write(Math.random() + "<br />");
//return a random integer between 0 and 10
document.write(Math.floor(Math.random()*11));
</script>

round(x):Rounds x to the nearest integer
document.write(Math.round(0.60) + "<br />");
document.write(Math.round(-4.40) + "<br />");
document.write(Math.round(-4.60));
</script>

sqrt(x):Returns the square root of x
document.write(Math.sqrt(0) + "<br />");
document.write(Math.sqrt(0.64) + "<br />");
document.write(Math.sqrt(-9));
</script>

Date Object
The Date object is used to work with dates and times.
Date objects are created with new Date().
There are four ways of instantiating a date:
var d = new Date();
var d = new Date(milliseconds);
var d = new Date(dateString);
var d = new Date(year, month, day, hours, minutes, seconds, milliseconds);

Date Object Methods
getDate():Returns the day of the month (from 1-31)
var d = new Date();
document.write(d.getDate());
</script>
Return the day of the month from a specific date:
var d = new Date("July 21, 1983 01:15:00");
document.write(d.getDate());
</script>

getDay():Returns the day of the week (from 0-6)
var d = new Date();
document.write(d.getDay());
</script>

Return the name of the weekday (not just a number):
var d=new Date();
var weekday=new Array(7);
weekday[0]="Sunday";
weekday[1]="Monday";
weekday[2]="Tuesday";
weekday[3]="Wednesday";
weekday[4]="Thursday";
weekday[5]="Friday";
weekday[6]="Saturday";
document.write("Today is " + weekday[d.getDay()]);
</script>

getFullYear():Returns the year (four digits)
var d = new Date();
document.write(d.getFullYear());
</script>
Return the four-digit year from a specific date:
document.write("I was born in " + d.getFullYear());
</script>

getHours():Returns the hour (from 0-23)
var d = new Date();
document.write(d.getHours());
</script>
Return the hour from a specific date and time:
document.write(d.getHours());
</script>

getMilliseconds():Returns the milliseconds (from 0-999)
var d = new Date();
document.write(d.getMilliseconds());
</script>
Return the milliseconds from a specific date and time:
document.write(d.getMilliseconds());
</script>

es():Returns the minutes (from 0-59)
h():Returns the month (from 0-11)
ds():Returns the seconds (from 0-59)
:Returns the number of milliseconds since midnight Jan 1, 1970
oneOffset():Returns the time difference between GMT and local time, in minutes
ate():Returns the day of the month, according to universal time (from 1-31)
ay():Returns the day of the week, according to universal time (from 0-6)

getUTCFullYear():Returns the year, according to universal time (four digits)
getUTCHours()Returns the hour, according to universal time (from 0-23)
getUTCMilliseconds(): Returns the milliseconds, according to universal time (from 0-999)
getUTCMinutes()Returns the minutes, according to universal time (from 0-59)
getUTCMonth()Returns the month, according to universal time (from 011)
getUTCSeconds()Returns the seconds, according to universal time (from 0-59)
setDate()Sets the day of the month (from 1-31)
var d = new Date();
d.setDate(15);
document.write(d);
</script>

setFullYear()Sets the year (four digits)
var d = new Date();
d.setFullYear(2020);
document.write(d);
</script>
Set the date to November 3, 1992
var d=new Date();
d.setFullYear(1992,10,3);
document.write(d);
</script>

setHours()Sets the hour (from 0-23)
Date.setHours(hour,min,sec,millisec)
var d = new Date();
d.setHours(15);
document.write(d);
</script>
Set the time to 15:35:01:
var d = new Date();
d.setHours(15,35,1);
document.write(d);
</script>

setMilliseconds()Sets the milliseconds (from 0-999)
Set the milliseconds to 192:
var d = new Date();
d.setMilliseconds(192);
document.write(d);
</script>

setMinutes()Set the minutes (from 0-59)
Date.setMinutes(min,sec,millisec)
Set the minutes to 01:
var d = new Date();
d.setMinutes(1);
document.write(d);
</script>
Out Put:
Sun Aug 15 2010 19:01:08 GMT+0530 (India Standard Time)

setMonth()Sets the month (from 0-11)
Date.setMonth(month,day)
Set the month to 0 (January):
var d = new Date();
d.setMonth(0);
document.write(d);
</script>
Set the month to 0 (January) and the day to 20:
var d = new Date();
d.setMonth(0,20);
document.write(d);
</script>

setSeconds()Sets the seconds (from 0-59)
Date.setSeconds(sec,millisec)
Set the seconds to 01:
var d = new Date();
d.setSeconds(1);
document.write(d);
</script>

setTime()Sets a date and time by adding or subtracting a specified number of
milliseconds to/from midnight January 1, 1970
Date.setTime(millisec)
var d = new Date();
d.setTime(77771564221);
document.write(d);
</script>

setUTCDate()Sets the day of the month, according to universal time (from 1-31)
setUTCFullYear()Sets the year, according to universal time (four digits)
setUTCHours()Sets the hour, according to universal time (from 0-23)
setUTCMilliseconds()Sets the milliseconds, according to universal time (from 0-
999)
setUTCMinutes()Set the minutes, according to universal time (from 0-59)
setUTCMonth()Sets the month, according to universal time (from 0-11)
setUTCSeconds()Set the seconds, according to universal time (from 0-59)

Opening a New Window
To open a new window, you will need to use yet another ready-made JavaScript
function.
Here is what it looks like:
window.open('url to open','window name','attribute1,attribute2')
1.'url to open'
This is the web address of the page you wish to appear in the new window.
2. 'window name'
You can name your window whatever you like, in case you need to make a reference to
the window later.
3. 'attribute1,attribute2'
As with alot of other things, you have a choice of attributes you can adjust.

Window Attributes
Below is a list of the attributes you can use:
1. width=300
Use this to define the width of the new window.
2. height=200
Use this to define the height of the new window.
3. resizable=yes or no
Use this to control whether or not you want the user to be able to resize the
window.
4. scrollbars=yes or no
This lets you decide whether or not to have scrollbars on the window.
5. toolbar=yes or no
Whether or not the new window should have the browser navigation bar at the
top (The back, foward, stop buttons..etc.).
6. location=yes or no
Whether or not you wish to show the location box with the current url (The place
to type http://address).

7. directories=yes or no
Whether or not the window should show the extra buttons. (what's cool,
personal buttons, etc...).
8. status=yes or no
Whether or not to show the window status bar at the bottom of the window.
9. menubar=yes or no
Whether or not to show the menus at the top of the window (File, Edit, etc...).
10. copyhistory=yes or no
Whether or not to copy the old browser window's history list to the new
window.

<HTML>
<HEAD>
<TITLE>JavaScript Example 5</TITLE>
</HEAD>
<BODY>
<CENTER>
<H1>This is a new window!</H1>
</CENTER>
<P>
<CENTER>
<FORM>
<input type="button" value="facebook"onclick="window.open('http://www.facebook.com',
'windowname1', 'width=200, height=77'); ">
</FORM>
</CENTER>
</BODY>
</HTML>

<HTML>
<HEAD>
<TITLE>JavaScript Example 5</TITLE> </HEAD>
<BODY>
<CENTER> <H1>This is a new window!</H1> </CENTER>
<P>
<CENTER>
<FORM>
<INPUT type="button" value="Close Window" onClick="window.close()"> </FORM>
</CENTER>
</BODY>
</HTML>

<html>
<head>
function open_win()
{
window.open("http://www.w3schools.com","_blank","toolbar=yes, location=yes, directories=no,
status=no, menubar=yes, scrollbars=yes, resizable=no, copyhistory=yes, width=400,
height=400");
}
</script>
</head>
<body>
<form>
<input type="button" value="Open Window" onclick="open_win()">
</form>
</body>
</html>

Login.html
<html>
<head>
<title>Login</title>
function validate(form){
var userName = form.Username.value;
var password = form.Password.value;
if (userName.length === 0) {
alert("You must enter a username.");
return false;
}
if (password.length === 0) {
alert("You must enter a password.");
return false;
} return true; } </script> </head>

<body>
<h1>Login Form</h1>
<form method="post" action="Process.html" onsubmit="return validate(this);">
Username: <input type="text" name="Username" size="10"><br/>
Password: <input type="password" name="Password" size="10"><br/>
<input type="submit" value="Submit"> <input type="reset" value="Reset Form">
</p>
</form>
</body>
</html>

<html>
<head>
<title>Login</title>
function validate(form)
{
var userName = form.Username.value;
var password = form.Password.value;
var number=form.PhoneNumber.value;
var str=form.Email.value;
if (userName.length < 6)
{
alert("You must enter 6 char a username.");
form.Username.focus();
return false;
}

if (password.length < 6)
{
alert("You must enter a min 6 char password.");
form.Password.focus();
return false;
}
if(number.length < 10)
{
alert("enter correct phone number");
form.PhoneNumber.focus();
return false;
}

var p1,p2,d;
p1=str.indexOf('@');
p2=str.indexOf('.');
d=p2-p1;
if(p1==0||p2==0||d<=1)
{
alert("enter correct email id");
form.Email.focus();
return false;
}
return true;
}
</script>
</head>

<body bgcolor="gerren" >
<h1>Login Form</h1>
<form method="post" action="http://www.gmail.com"
onsubmit="return validate(this);">
Username: <input type="text" name="Username" size="10"><br/><br/>
Password: <input type="password" name="Password" size="10"><br/>
Phone Number: <input type="text" name="PhoneNumber" size="10"><br/>
E-mail: <input type="text" name="Email" size="20"><br/>
<input type="submit" value="Submit">
<input type="reset" value="Reset Form">
</p>
</form>
</body>
</html>

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