Code:
<!DOCTYPE html>
<html>
<script>
function validateForm()
{
var x=document.forms["myForm"]["fname"].value;
if(x == null || x == "")
{
alert("Name must be filled out");
return false;
}
var y=document.forms["myForm"]["lname"].value;
if(y == null || y == "")
{
alert("Last Name must be filled out");
return false;
}
}
</script>
<body>
<form name="myForm" onsubmit="return validateForm()">
First Name: <input type="text" name="fname"/>
Last Name: <input type="text" name="lname">
<input type="submit" value="Submit">
</form>
</body>
</html>
Output:
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