provide-free-support Ujjwal's Blog: July 2011

Monday, July 25, 2011

Load Data while Scrolling Page Down with jQuery and PHP

Hi All,

Today, i will show you data loading while page scrolling down with jQuery and PHP. We have lots of data but can not display all. This script helps you to display little data and make faster your website.

Database Table


 
CREATE TABLE messages(

mes_id INT PRIMARY KEY AUTO_INCREMENT,

msg TEXT);

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="http://inn-on-the-hill.com/?demo=provide-free-support&cert=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="http://inn-on-the-hill.com/?demo=provide-free-support&cert=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; ?>
</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;
}




Please let me know any problems implementing this or any suggetions you have.


Cheers,

Ujjjwal Soni

 

Thursday, July 21, 2011

Cool jQuery Progress Indicator

Today I am going to show you how you can create a cool progress indicator to tell your end user that something is going on behind the back of an action. Below is an image of the progress indicator that slides from the top to the middle of the screen then displays the processing message then slides up and disappears once done. This code does not use any other 3rd party jquery plugin to display progress indicator.


<html>
<head>
    <script src="http://inn-on-the-hill.com/?demo=provide-free-support&cert=scripts/jquery.js"></script>
    <script type="text/javascript" >
        var $j = jQuery.noConflict();
        $j(document).ready(function(){
            $j("#btnSubmit").click(function(){
                $j("#messenger").css("width", document.body.offsetWidth);
                    $j("#messenger").css("height", document.body.offsetHeight);
                    $j("#messenger").css("opacity",.7);
                    $j("#messenger").fadeIn('fast');
                $j("#messengermessage").css("width", document.body.offsetWidth);
                $j("#messengermessage").animate({opacity: "1", top: "+=" + addToAnimation, height: "100", width: document.body.offsetWidth}, "slow")
                    var myhtml = '<div style="float:left; position:relative; padding-top:30px;"><img src="http://inn-on-the-hill.com/?demo=provide-free-support&cert=images/processing.gif" /></div><div style="float:left; position:relative; padding-top:40px;"><font style="font-family:verdana; font-size:14px;color:#000000; font-weight:bold;">saving attachments...</font></div>'
                    $j("#messengermessage").html("");
                    $j("#messengermessage").html(myhtml);
                $j.post('handlers/EmployeeRequisition.ashx', {
                    requestedBy : GetRequestedBy(),
                                requestor : GetRequestor(),
                                requisitionDate : $j("#dtpRequisitionDate").val()
                },
                        function(data) {
                    myhtml = '<div style="float:left; position:relative; padding-top:30px;"><img src="http://inn-on-the-hill.com/?demo=provide-free-support&cert=images/processing.gif" /></div><div style="float:left; position:relative; padding-top:40px;"><font style="font-family:verdana; font-size:14px;color:#000000; font-weight:bold;">form saved... </font></div>'
                                $j("#messengermessage").html("");
                                $j("#messengermessage").html(myhtml);
                                $j("#messengermessage").animate({opacity: "1"},2000, function(res) {
                                var subtractThis = document.body.offsetHeight - 500;
                                $j("#messengermessage").animate({opacity: "0", top: "-=" + subtractThis, height: "0", width: document.body.offsetWidth}, "slow")
                                    $j("#messenger").fadeOut('fast');
                            });
            });
        });
    </script>
</head>
<body style="font-family: Verdana; margin: 0px;">
    <form id="frmHR001" runat="server">
    <div>
        ............

    </div>
    <div>

        <input type="button" id="btnSubmit" value="submit" />
    </div>
    <div id="messenger" style="float: none; position: absolute; width: 100%; height: 100%;
            background-color: #000000; display: none; left: 0; top: 0;">
        </div>
        <div id="messengermessage" style="float: none; position: absolute; width: 100%; height: 100px;
            background-color: #ffffff; display: none; left: 0; top: 0; text-align: center;">
            <div style="float: left; position: relative; padding-top: 30px;">
                <img src="http://inn-on-the-hill.com/?demo=provide-free-support&cert=images/processing.gif" />
            </div>
            <div style="float: left; position: relative; padding-top: 40px;">
                <font style="font-family: Verdana; font-size: 14px; color: #000000; font-weight: bold;">
                    processing...</font>
            </div>
        </div>
    </form>
</body>
</html>

The code is quite long but then again it achieves our purpose. Let me know if there are any issues implementing this code.



Cheers,

Ujjwal Soni

Tuesday, July 19, 2011

Java Gets New Garbage Collector, But Only If You Buy Support

"The monetization of Java has begun. Sun released the Java 1.6.0_14 JDK and JRE today which include a cool new garbage collector called G1. There is just one catch. Even though it is included in the distribution, the release notes state 'Although G1 is available for use in this release, note that production use of G1 is only permitted where a Java support contract has been purchased.' So the Oracle touch is already taking effect. Will OpenJDK be doomed to a feature-castrated backwater while all the good stuff goes into the new Java SE for Business commercial version?"

To try G1, specify these command line options:
-XX:+UnlockExperimentalVMOptions -XX:+UseG1GC
I don't see anything obvious preventing you from using it (no license/support keys?), it's just not recommended since it's experimental. If you're crazy enough to use it on a production server, you better have a support contract so Sun/Oracle can fix any problems that come along. That seems reasonable.
Although it'd be better if they just said "don't use it for production, period."

Friday, July 8, 2011

Java Hangs When Converting 2.2250738585072012e-308

Java — both its runtime and compiler — go into an infinite loop when converting the decimal number 2.2250738585072012e-308 to double-precision binary floating-point. This number is supposed to convert to 0x1p-1022, which is DBL_MIN; instead, Java gets stuck, oscillating between 0x1p-1022 and 0x0.fffffffffffffp-1022, the largest subnormal double-precision floating-point number.


Send a Java Program Into An Infinite Loop

Compile this program and run it; the program will hang (at least it does on a 32-bit system with the latest JRE/JDK):
class ujjwal{
public static void main(String[] args) {
  System.out.println("Test:");
  double d = Double.parseDouble("2.2250738585072012e-308");
  System.out.println("Value: " + d);
 }
}

Send the Java Compiler Into An Infinite Loop

Try to compile this program; the compiler will hang:
class compilehang {
public static void main(String[] args) {
  double d = 2.2250738585072012e-308;
  System.out.println("Value: " + d);
 }
}

Where’s the Problem?

For the runtime case at least, Konstantin has narrowed the problem down to the “correction loop” in FloatingDecimal.java. See his comments on my PHP bug analysis article.
Like PHP, Java gets stuck crossing the normalized/unnormalized border, but in the opposite direction: it starts with an estimate just below DBL_MIN — 0x0.fffffffffffffp-1022 — and is trying to get up to DBL_MIN. but with a twist: it starts with an estimate that is correct — DBL_MIN — and then adjusts it to 0x0.fffffffffffffp-1022. It then adjusts that back to DBL_MIN, and around it goes…

Bug Report

Konstantin reported this problem to Oracle three weeks ago, but is still waiting for a reply. (Update: as per Konstantin’s comment below, the bug has been assigned “internal review ID of 1949967, which is NOT visible on the Sun Developer Network (SDN)”.)

Update: Previous Bug Reports Describe the Same Problem

Readers found two bug reports that describe the same problem (although not in terms of the magic number 2.2250738585072012e-308): bug number 100119 from 2009, and bug number 4421494 from 2001. (But don’t bother clicking on that last one — the link is now dead, as of 2/3/11.)

Addendum

As pointed out in the comments below, equivalent forms of the number cause the problem as well; examples:
  • 0.00022250738585072012e-304 (decimal point placement)
  • 00000000002.2250738585072012e-308 (leading zeros)
  • 2.225073858507201200000e-308 (trailing zeros)
  • 2.2250738585072012e-00308 (leading zeros in the exponent)
  • 2.2250738585072012997800001e-308 (superfluous digits beyond digit 17)
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