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Login Page with Validations

- on Wednesday, July 27, 2011 - No comments
<?php
session_start();
if(isset($_SESSION["username"]) && $_SESSION["username"] != null){
    header("location:index.php");
}
?>
<html>
<head>
<script type="text/javascript">

function validate(form_id,username,password) {
   var reg = /^[a-zA-Z]{3,}$/;
   var reg1 = /^[a-zA-Z0-9]{6,}$/;
   var username = document.forms[form_id].elements[username].value;
   var password = document.forms[form_id].elements[password].value;
   if(reg.test(username) == false) {

      alert('Invalid Username');
      return false;
   }
   if(reg1.test(password) == false) {
       alert('Invalid Password');
      return false;
   }
}
</script>
</head>
<body>
<form id="form_id" name="login" method="POST" action="login.php" onsubmit="javascript:return validate('form_id','username','password');">
<table border="0">
    <tr>
        <td>* Username :</td>
        <td><input type="text" name="username" id="username"></td>
    </tr>
    <tr>
        <td>* Password :</td>
        <td><input type="password" name="password" id="password"></td>
    </tr>
    <tr>
        <td><input type="submit" name="login" value="Login"> </td>
        <td><a href="forgotpassword.php">Forgot Password</a></td>
    </tr>
</table>
</form>
<?php
if(isset($_POST['login'])){
include "config.php";
$username=$_POST['username'];
$password=$_POST['password'];
$sql="SELECT * FROM simple WHERE username='$username' and password='$password'";
$result=mysql_query($sql);
$login=mysql_num_rows($result);
if($login)
{
    $_SESSION["username"] = $username;
    header("location:index.php");
}
else
{
 echo "Wrong Username or Password";
}
}
?>
</body>
</html>

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