FORM VALIDATION USING JAVASCRIPT
A JavaScript program to validate a form
<!DOCTYPE html>
<html>
<head>
<script>
function validateForm() {
var x = document.myForm.fname.value;
var l = document.myForm.lname.value;
if (x == null || x == "") {
alert("Name must be filled out");
return false;
}
if(l ==null||l=="")
{
alert("last name must be filled out");
}
}
</script>
</head>
<body>
<form action="demo_form.asp" method="post" name="myForm" onsubmit="return validateForm()">
Name: <input name="fname" type="text" />
Lastname=<input name="lname" type="text" />
<input type="submit" value="Submit" />
</form>
</body>
</html>