Check Availability of Name in Registration Page in PHP

Satyapriya Nayak
Feb 17, 2013
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First we will create a registration page that contains three fields such as name, address and password. While entering a name in the textbox, if it already exists in the database it will show a message ("Sorry! you can't take this name") and vice-versa.

Table Creation

-- phpMyAdmin SQL Dump
-- version 2.10.1
-- http://www.phpmyadmin.net
--
-- Host: localhost
-- Generation Time: Feb 17, 2013 at 11:01 AM
-- Server version: 5.0.45
-- PHP Version: 5.2.5
SET SQL_MODE="NO_AUTO_VALUE_ON_ZERO";
--
-- Database: `home_work`
--
-- --------------------------------------------------------
--
-- Table structure for table `employee`
--
CREATE TABLE `employee` (
`id` int(12) NOT NULL auto_increment,
`name` varchar(100) default NULL,
`address` varchar(100) NOT NULL,
`password` varchar(50) default NULL,
PRIMARY KEY (`id`),
UNIQUE KEY `name` (`name`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1 AUTO_INCREMENT=2 ;
--
-- Dumping data for table `employee`
--
INSERT INTO `employee` (`id`, `name`, `address`, `password`) VALUES
(1, 'Raj', 'Pune', 'cac5ff630494aa784ce97b9fafac2500');
config.php
<?php
$DBHOST = "localhost";
$DBNAME = "home_work";
$DBUSER = "root";
$sLink = mysql_connect($DBHOST,$DBUSER,'') or die('Connection with MySql Server failed');
mysql_select_db($DBNAME, $sLink) or die('MySql DB was not found');
?>
registration.php
<?php
session_start();
include('config.php');
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>Employee Registration</title>

<link href="style.css" rel="stylesheet" type="text/css" />
<style type="text/css">
.style1 {
text-align: left;
}
.style2 {
text-align: left;
color: #0000FF;
}
.style3 {
color: #0000FF;
}
.style4 {
color: #FF0000;
}
</style>
<script type="text/javascript" src="js/jquery-1.4.2.js"></script>
<script type="text/javascript">
$(document).ready(function(){
//called when key is pressed in textbox
$("#name").keypress(function (e)
{
$("#error").hide();
$("#autoSuggestionsList").hide();
//if the letter is not digit then display error
if( e.which!=8 && e.which!=0 && (e.which<48 || e.which>57)&& (e.which<65 || e.which>90)&& (e.which<97 || e.which>122))
{
//display error message
$("#error").html("No Special Characters").show();
return false;
}
});});
function lookup(name)
{
if(name.length <3)
{
$('#suggestions').show();
$('#autoSuggestionsList').hide();
}
else
{
$('#suggestions').hide();
$.post("Checkname.php",{user: ""+name+""},function(data){
$('#autoSuggestionsList').html(data).show();
});
}
}

</script>
<script language="javascript" type="text/javascript">

function validation()
{
var formName=document.frm;
if(formName.name.value == "")
{
document.getElementById("name_label").innerHTML='Please Enter Name';
formName.name.focus();
return false;
}
else
{
document.getElementById("name_label").innerHTML='';
}

if(formName.address.value == "")
{
document.getElementById("address_label").innerHTML='Please Enter Address';
formName.address.focus();
return false;
}
else
{
document.getElementById("address_label").innerHTML='';
}

if(formName.password.value == "")
{
document.getElementById("password_label").innerHTML='Please Enter Password';
formName.password.focus();
return false;
}
else
{
document.getElementById("password_label").innerHTML='';
}
}

</script>
</head>
<?php
if($_REQUEST["action"]=='register')
{
$_SESSION["name"]=$_POST["name"];
$name=mysql_real_escape_string($_SESSION["name"]);
$address=mysql_real_escape_string($_POST['address']);
$password=mysql_real_escape_string($_POST['password']);
$password=md5($password); // Encrypted Password
$sql="Insert into employee(name,address,password) values('$name','$address','$password');";
$result=mysql_query($sql);
echo "Registration Successfully Completed";
echo "<script>window.location.href='welcome.php'</script>";
}
?>
<body>
<form method="post" id="frm" name="frm" action="registration.php?action=register" onSubmit="return validation();">
<table width="500" border="0">
<tr>
<td class="deepbluetextbold"><b>Employee Registration</b></td>
</tr>
<tr>
<td class="colouredCell">Name*</td>
<td>
<input name="name" type="text" id="name" onkeyup="lookup(this.value);"autocomplete="off" value="<?php echo $_REQUEST[name]; ?>"/>  <label id="name_label" class="level_msg"></label></td>
</tr>
<tr><td><font color="red"><div id="suggestions" style="display: none;">More than 2 characters</div>
<div style="display: none;" id="autoSuggestionsList"></div>
<div style="display: none;" id="error"></div></td></tr>
<tr>
<td class="colouredCell">Address*</td>
<td><input type="text" name="address" id="address" autocomplete="off" value="<?php echo $_REQUEST[address]; ?>"/>  <label id="address_label" class="level_msg"></label></td>
</tr>
<tr>
<td class="colouredCell">Password*</td>
<td><input type="password" name="password" id="password" autocomplete="off"/>  <label id="password_label" class="level_msg"></td>
</tr>
</table>
</tr>
<tr>
<td>
<input type="submit" name="Submit" value="Register" /> </td>
<td> </td>
</tr>
</table>
</form>
</body>
</html>
Checkname.php
<?php
session_start();
$str=$_POST['user'];
$host="localhost";
$username="root";
$password="";
$db_name="home_work";
$con = mysql_connect($host,$username,$password) or die(mysql_error());;
mysql_select_db($db_name, $con) or die(mysql_error());
$sql= "SELECT name FROM employee WHERE name='".$str."'";
$result=mysql_query($sql,$con) or die(mysql_error());
$count=0;
while($row = mysql_fetch_array($result, MYSQL_ASSOC))
{
$count++;
}
if($count==0)
{
echo "You can take this name";
}
else
{
echo "Sorry! you can't take this name";
}
?>
welcome.php
<?php
session_start();
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>Welcome</title>
</head>
<body>
<form action="welcome.php" method="get" name="welcome">
<b>Registration Successfully Completed</b><br/>
<?php echo '<b>Welcome:::</b>'.$_SESSION["name"]; ?>
</form>
</body>
</html>

Running the application

Run the WampServer then write the following line in the URL:

http://localhost/Availability Username/

When we insert Raj the second time for registration it displays the message "Sorry! You can't take this name".