Display data which are related to selected combo box value.Data will be changed when the combo box value gets changed.

sql

</pre>
CREATE TABLE IF NOT EXISTS `ajax_database` (
`id` int(32) NOT NULL,
`name` text NOT NULL,
`address` text NOT NULL,
`age` int(32) NOT NULL,
`city` varchar(30) NOT NULL
) ENGINE=MyISAM DEFAULT CHARSET=latin1;

--
-- Dumping data for table `ajax_database`
--

INSERT INTO `ajax_database` (`id`, `name`, `address`, `age`, `city`) VALUES
(1, 'Nimesha', 'kelaniya,sri Lanka', 26, 'Kelaniya'),
(2, 'Savinda', 'Polhena,Sri Lanka', 17, 'Kelaniya'),
(3, 'John', 'Canada', 20, 'abc');
<pre>

index.php

<html>
<head>
<script type="text/javascript">
function showUser(str)
{
if (str=="")
{
document.getElementById("txtHint").innerHTML="";
return;
}
if (window.XMLHttpRequest)
{// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp=new XMLHttpRequest();
}
else
{// code for IE6, IE5
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange=function()
{
if (xmlhttp.readyState==4 && xmlhttp.status==200)
{
var myTable = document.getElementById('tblDisplay');
var tBody = myTable.getElementsByTagName('tbody')[0];
tBody.innerHTML = xmlhttp.responseText;
}
}
xmlhttp.open("GET","ajax.php?id="+str,true);
xmlhttp.send();
}

</script>
</head>
<body>

<form onLoad="getusers()">
<select name="users" onchange="showUser(this.value)">
<option value=''>Select</option>;
<?php
$con = mysql_connect('localhost', 'root', 'adminpns');
mysql_select_db("site", $con);
$sql="SELECT * FROM ajax_database";
$result = mysql_query($sql);
while($row = mysql_fetch_array($result)) {
echo "<option value='$row[id]'>$row[name]</option>";
}
?>
</select>
<table border='0' id="tblDisplay">
<tbody>
</tbody>
</table>
</form>
<br />
</body>
</html>

ajax.php

<?php
$id=$_GET["id"];

$con = mysql_connect('localhost', 'root', 'adminpns');
if (!$con) {
die('Could not connect: ' . mysql_error());
}

mysql_select_db("site", $con);
$sql="SELECT * FROM ajax_database WHERE id = '".$id."'";
$result = mysql_query($sql);

while($row = mysql_fetch_array($result)) {
echo "<tr><td>ID :</td><td>" . $row['id'] . "</td></tr>";
echo "<tr><td>Name  :</td><td>" . $row['name'] . "</td></tr>";
echo "<tr><td>Address  :</td><td>" . $row['address'] . "</td></tr>";
echo "<tr><td>Age  :</td><td>" . $row['age'] . "</td></tr>";
echo "<tr><td>City  :</td><td>" . $row['city'] . "</td></tr>";
}

mysql_close($con);