HTML Code
<html>
<head>
<title>
Form Validation Program
</title>
<script type="text/javascript">
function valid(v1,v2,v3,v4)
{
if(v1==""||v2==""||v3==""||v4=="")
{
alert("Fill all the fields");
}
}
function pass(p1)
{
if(p1.length<8)
alert("Password should be 8 charcters");
}
function mail()
{
var e1,e2,e3,e4;
e1= new String(frm1.f3.value);
e2=e1.indexOf("@");
e3=e1.indexOf(".");
e4=e1.lastIndexOf(".");
if(e2==0 || e3==0)
alert("Invalid email id!!!!\n@ and . cant be the first character.");
if(e2==-1)
alert("Invalid email id!!!!\n @ should be present.");
if(e3==-1)
alert("Invalid email id!!! \n . should be present.");
if(e2==e1.length-1 || e3==e1.length-1)
alert("Invalid email id!!!!\n@ and . cant be the last character.");
if(e2==e3-1 || e3==e2-1)
alert("Invalid email id!!!!\n@ and . cant be together.");
if(e4<e2)
alert("Invalid email id!!!!\\nOne . should be present after @")
}
</script>
<body>
<table>
<form name="frm1">
<tr><td>First Name<td><input type="text" name="f1"><br>
<tr><td>Last Name<td><input type="text" name="f2"><br>
<tr><td>Email Id<td><input type="text" name="f3" onchange="mail()" tabindex="1"></td><br>
<tr><td>Password<td><input type="password" name="f4" onchange="pass(frm1.f4.value)"></td><br>
<tr><td><input type="submit" value="submit" onclick="valid(frm1.f1.value,frm1.f2.value,frm1.f3.value,frm1.f4.value)"></td><br>
</form>
</table>
</body>
</html>
Output
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