PHP Example
Screen shot
PHP Script to Validating data from Server Side.
<?php
if(isset($_POST[\'btnsubmit\']))
{
if($_POST[\'userid\']==\"\")
$userid_msg=\"Please Enter User ID\";

if($_POST[\'password\']==\"\")
$password_msg=\"Please Enter Password\";
}
?>
<html>
<head>
<title>Validating data from Server Side</title>
</head>
<body>
<form name=\"frm\" method=\"post\" action=\"\">
<table border=\"1\">
<tr>
<td>User ID</td>
<td><input name=\"userid\" type=\"text\" />
<?php
if(isset($userid_msg) && $userid_msg!==\"\")
echo \"<br>\".\"<font color=\'red\'>\".$userid_msg.\"</font>\";
?>
</td>
</tr>
<tr>
<td>Password</td>
<td><input name=\"password\" type=\"password\" />
<?php
if(isset($password_msg) && $password_msg!==\"\")
echo \"<br>\".\"<font color=\'red\'>\".$password_msg.\"</font>\".\"<br>\";
?>
</td>
</tr>
<tr>
<td>&nbsp;</td>
<td>
<input name=\"btnsubmit\" type=\"submit\" value=\"submit\" />
</td>
</tr>
</table>
</form>
</body>
</html>

You can download source code here