<html>
<body>
<script language="JavaScript">
function chkuname()
{
uname=new String();
uname=document.regis.uname.value
if ( uname.length == 0 )
{
alert ("Enter a User Name");
}
else
{
chkupass()
}
}
function chkupass()
{
upass=new String();
upass=document.regis.upass.value
if (upass.length < 5)
{
alert ("Password Must be atleast 6 Chars");
}
else
{
chkname()
}
}
function chkname()
{
var ch=0;
name=new String();
name=document.regis.name.value;
if (name.length==0)
alert ("Enter your Name")
else
{
u=0;
for (i=0;i<name.length;i++)
{
if ((name.charCodeAt(i) >= 64 && name.charCodeAt(i) <= 90)||(name.charCodeAt(i) >= 97 && name.charCodeAt(i) <= 122)||(name.charCodeAt(i)==46)||(name.charCodeAt(i)==32))
{
}
else
{
u=u+1;
}
}
if (u>0)
{
alert ("Invalid Name");
}
else
{
chkdob()
}
}
}
function chkdob()
{
dob=new String();
dob=document.regis.dob.value
if (dob.length!=10)
alert ("Invalid Date")
else
{
if (dob.charAt(2)!="/" && dob.charAt(5)!="/")
alert ("Invalid Date Format")
else
tempstr=dob.split("/")
dd=tempstr[0]
mm=tempstr[1]
yy=tempstr[2]
if (dd>=1 && dd<=31 && mm>=1 && mm<=12 && yy>=1900 && yy<=2004 )
{
chkemail()
}
else
alert ("Enter Valid date")
}
}
function chkemail()
{
mail=new String();
mail=document.regis.email.value
if (mail.length<1)
alert("Please enter e-mail address.");
else
{
at_pos=mail.indexOf("@")
dot_pos=mail.indexOf(".")
if(at_pos<1 || dot_pos<1)
alert("Missing '@' and '.' in email address.")
else
{
u=0;
p=0;
for(var i=0;i<mail.length;i++)
{
if ((mail.charCodeAt(i) >= 64 && mail.charCodeAt(i) <= 90)||(mail.charCodeAt(i) >= 97 && mail.charCodeAt(i) <= 122)||(mail.charCodeAt(i) >= 48 && mail.charCodeAt(i) <= 57)||(mail.charCodeAt(i)==95)||(mail.charCodeAt(i)==46))
{
if(mail.charAt(i)=="@")
p=p+1
}
else
{
u=u+1
}
}
if (p>1)
alert ("Email must have only one '@'")
if (u>0)
alert ("Special Characters are not allowed")
}
}
}
</script>
<form name="regis">
User Name : <input type="text" name="uname" size="20">
<br>
Password : <input type="password" name="upass" size="20">
<br>
Name : <input type="text" name="name" size="20">
<br>
DOB (DD/MM/YYYY): <input type="text" name="dob" size="8">
<br>
Email : <input type="text" name="email" size="20">
<br>
<input type="button" value="Submit" onclick="chkuname()" name="sub">
</form>
</body>
</html>
