Download Script 
Live DemoDatabase Table
CREATE TABLE messages(
mes_id INT PRIMARY KEY AUTO_INCREMENT,
msg TEXT);
mes_id INT PRIMARY KEY AUTO_INCREMENT,
msg TEXT);
Browser Capability : Safari, Firefox, IE, Chrome
load_data.php
When we are scrolling down a webpage, the script($(window).scroll) finds that you are at the bottom and calls the last_msg_funtion(). Take a look at $.post("") eg:$.post("load_data.php?action=get&last_msg_id=35")
<?php
include('config.php');
$last_msg_id=$_GET['last_msg_id'];
$action=$_GET['action'];
if($action <> "get")
{
?>
<script type="text/javascript" src="jquery.js"></script>
<script type="text/javascript">
$(document).ready(function()
{
function last_msg_funtion()
{
var ID=$(".message_box:last").attr("id");
$('div#last_msg_loader').html('<img src="bigLoader.gif">');
$.post("load_data.php?action=get&last_msg_id="+ID,
function(data){
if (data != "") {
$(".message_box:last").after(data);
}
$('div#last_msg_loader').empty();
});
};
$(window).scroll(function(){
if ($(window).scrollTop() == $(document).height() - $(window).height()){
last_msg_funtion();
}
});
});
</script>
</head>
<body>
<?php include('load_first.php'); //Include load_first.php
?>
<div id="last_msg_loader"></div>
</body>
</html>
<?php}
else
{
include('load_second.php'); //include load_second.php
}
?>
load_first.php
Contains PHP code to load 20 rows form the message table.
<?php
$sql=mysql_query("SELECT * FROM messages ORDER BY mes_id DESC LIMIT 20");
while($row=mysql_fetch_array($sql))
{
$msgID= $row['mes_id'];
$msg= $row['msg'];
?>
<div id="<?php echo $msgID; ?>" class="message_box" >
<?php echo $msg; ?>
}
?>
$sql=mysql_query("SELECT * FROM messages ORDER BY mes_id DESC LIMIT 20");
while($row=mysql_fetch_array($sql))
{
$msgID= $row['mes_id'];
$msg= $row['msg'];
?>
<div id="<?php echo $msgID; ?>" class="message_box" >
<?php echo $msg; ?>
</div>
<?php}
?>
load_second.php
Contains PHP code to load 5 rows less than last_msg_id form the message table.
<?php
$last_msg_id=$_GET['last_msg_id'];
$sql=mysql_query("SELECT * FROM messages WHERE mes_id < '$last_msg_id' ORDER BY mes_id DESC LIMIT 5");
$last_msg_id="";
while($row=mysql_fetch_array($sql))
{
$msgID= $row['mes_id'];
$msg= $row['msg'];
?>
<div id="<?php echo $msgID; ?>" class="message_box" >
<?php echo $msg;
?>
</div>
<?php}
?>
CSS
body
{font-family:'Georgia',Times New Roman, Times, serif;
font-size:18px;
}
.message_box
{height:60px;
width:600px;
border:dashed 1px #48B1D9;
padding:5px ;
}
#last_msg_loader
{text-align: right;
width: 920px;
margin: -125px auto 0 auto;
}
.number
{float:right;
background-color:#48B1D9;
color:#000;
font-weight:bold;
}
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