How to get time from server using ajax? - php

Question

I am trying to create a website like penny auction how to display the count down time?
i tried that using ajax, but sometimes it swallow one or two seconds, it shows seconds like 10,9,7,6,3... i mean it doesn't show the proper count down time.. please help me to solve this problem
here is my code
<?php
#session_start();
include "includes/common.php";
include_once "includes/classes/class.Auction.php";
$objAuction = new Auction();
$result=$objAuction -> getStatus();
echo $result;
?>
//ajax code
function getStatusOne(pId)
{
var strURL="get_status_one.php?pId="+pId;
var req = getXMLHTTP();
if (req)
{
req.onreadystatechange = function()
{
if (req.readyState == 4)
{
if (req.status == 200)
{
//alert(req.responseText);
var result= req.responseText.substr(1).split("|");
for (var x = 0; x < result.length; x++)
{
var resultN=result[x].split(",");
var prId=resultN[0];
var temp=resultN[1];
var sec=parseInt(temp);
var price=resultN[2];
//alert(prId+' '+temp+' '+price);
var mem=resultN[3];
var img=resultN[4];
var autobid=resultN[5];
if(img=='') {
img='images/profile/no_image.jpg'
}
if(!price)
{
price='0.00';
}
if(!mem)
{
mem='No Bidders Yet';
}
if(document.getElementById("bid_price"+prId))
{
document.getElementById("bid_price"+prId).innerHTML='$'+price;
document.getElementById("bidder_name"+prId).innerHTML=mem;
document.getElementById("userimg").src=img;
document.getElementById("bid_rate").innerHtml=autobid;
if(sec<= -1)
{
sold(prId);
if(document.getElementById('end'+pId))
{
document.getElementById('end'+pId).style.display="block";
}
if(document.getElementById('div_bid_image'))
{
document.getElementById('div_bid_image').style.display="none";
}
if(document.getElementById('clsBidB'+pId))
{
document.getElementById('clsBidB'+pId).style.display="none";
}
}
else {
if(document.getElementById('div_bid_image').style.display == "none")
{
document.getElementById('div_bid_image').style.display="block";
}
if(sec >=0)
{
SetCountdownText(sec,"div_timer"+prId,prId);
}
}
}
}
}
else
{
//alert("There was a problem while using XMLHTTP:\n" + req.statusText);
}
}
}
req.open("POST", strURL, true);
req.send(null);
}
}
//php code to calculate time
function getStatus()
{
$selProd="select a.pdt_id, unix_timestamp(a.end_date) - unix_timestamp('".date('Y-m-d H:i:s')."') as seconds, b.bid_price,c.uname from tbl_products a left join tbl_auction b on a.pdt_id=b.product_id left join tbl_members c on b.member_id=c.member_id where(select unix_timestamp(a.end_date) - unix_timestamp('".date('Y-m-d H:i:s')."'))>= 0 ";
if($this->ExecuteQuery($selProd,"norows") > 0)
{
$auctionArr=$this->ExecuteQuery($selProd,"select");
$auctionName=$this->array2str($auctionArr);
}
return $auctionName;
}
function array2str($array,$level=1)
{
$str = array();
foreach($array as $key=>$value) {
if(is_int($key))
{
$nkey = $key;
$nvalue = is_array($value)?'|'.$this->array2str( $value ) : $value;
$str[] = $nvalue;
}
}
return implode(',',$str);
}

Answer 1

try this
<?php
$target = mktime(0, 0, 0, 14, 07, 2011) ;
$today = time () ;
$difference =($target-$today) ;
$days =(int) ($difference/86400) ;
print "Our event will occur in $days days";
?>

Answer 2

Assuming you have something like a DIV with the ID "countdown" (to display the countdown in):
Example JavaScript (assumes use of jQuery - recommended):
(function(jQuery) {
updateCountdown("countdown"); // Call on page load
var countdown = setInterval('updateCountdown("countdown")', 1000); // Update countdown every second
})(jQuery);
function updateCountdown(elementId) {
jQuery.ajax({
url: "/ajax/countdown.php?auctionId=123",
type: "GET",
dataType: "json",
success: function(response) {
// Insert value into target element
jQuery("#"+elementId).html(response["timeRemaining"]);
// Stop countdown when complete
if (response["countdownComplete"] == true)
clearInterval(countdown);
}
});
}
Example PHP script (assumed to be at /ajax/countdown.php by the above JavaScript):
<? php
/* Insert your own logic here */
$response["timeRemaining"] = "5 seconds";
$response["countdownComplete"] = false; // Set to true when countdown complete
echo json_encode(response);
?>
I'd recommend doing all the calculation server side (in PHP) as it has really excellent time/date handling (with lots of built in methods) and requires less code to implement overall.

Answer 3

Have a PHP page echo out the countdown time. And then use something like jQuery's AJAX HTTP Request for that page and populate the response in a DOM element somewhere.

Answer 4

Why do you need Ajax to display the countdown time? Why can't you just display it when the page loads along with the rest of the data?