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Javascript for Userid and password Validation. You can put this code on head tag of html code.

<script language="javascript"> function validation (myform) { if(myform.userid.value =="") { alert("Enter UserName"); myform.userid.focus(); return false; } if(myform.password.value == "") { alert("Enter Password"); myform.password.focus(); return false; } return true; } </script>

 

Inside Body tag:

<form name="frmLogin" method="post" onSubmit="return validation(this)" > <table align="center"> <th align="center" colspan="2"> <font size="+1" >Login</font></th> <tr> <td>User Name</td> <td><input type="text" name="userid" /></td> </tr> <tr> <td>Password</td> <td><input type="password" name="password" /></td> </tr> <tr> <td colspan="2" align="center"><input type="submit" name="login" value="Submit" /></td> </tr> </table> </form> <?php if($_POST['login']!='') { $SelQuery = "Select * from login Where userid = '".trim($_POST['userid'])."' AND password ='".trim($_POST['password'])."' "; $SelResult = mysql_query($SelQuery,$Link); $rec=mysql_fetch_assoc($SelResult); if(trim($rec['userid']) == trim($_POST['userid']) && trim($rec['password']) == trim($_POST['password']) && trim($rec['user_type']) =="Admin") { $_SESSION['userid']=trim($_POST['userid']); ?> <!--if it is correct data, then the page redirect to admin_index.php page--> <script language="javascript"> window.location.href="admin_index.php"; </script> <?php } else echo "Invalid User Id Or Password"; } ?>