timer does not work in IE

[momukhtar]

I have a Ajax / PHP timer code that would run and update timer on a webpage for 2 hrs. But in IE the time does not refresh and maintain its initial value.

function timer() { 
//debugger; 
   var xmlHttp; 
   try { 

      xmlHttp=new XMLHttpRequest(); 
   } 
   catch (e) { 
      // Internet Explorer 
      try { 
         xmlHttp=new ActiveXObject("Msxml2.XMLHTTP"); 
       } 
      catch (e) { 
         try { 
            xmlHttp=new ActiveXObject("Microsoft.XMLHTTP"); 
         } 
         catch (e) { 
            alert("Your browser does not support AJAX!"); 
            return false; 
         } 
       } 
   } 
    
   xmlHttp.onreadystatechange=function() { 
      if(xmlHttp.readyState==4) { 
         document.onlinetestform.timer1.value = xmlHttp.responseText; 

       } 
   } 
   xmlHttp.open("GET","time.php?time=06:51:00",true); 
   xmlHttp.send(null); 
   newtime = window.setTimeout("timer();", 1000); 
}

[PHP]<?php

function timeDiff($start Time) {


$tNow = date("h:i:s");
//echo $tNow."<br/>";

// Extract $current_date h:m:ss
$current_hour = substr($tNow,0, 2);
$current_min = substr($tNow,3, 2);
$current_second s = substr($tNow, 6, 2);

$start_hour = substr($startTi me,0,2);
$start_min = substr($startTi me,3,2);
$start_seconds = substr($startTi me, 6, 2);

$tFinishtime = mktime($start_h our+2, $start_min, $start_seconds) ;
$tCurrenttime = mktime($current _hour, $current_min, $current_second s);

$hoursround = floor(($tFinish time-$tCurrenttime)/3600);
$minutesround = floor((($tFinis htime-$tCurrenttime)/60) - (60 * $hoursround) );
$secondsround = ($tFinishtime-$tCurrenttime) - (60 * 60 * $hoursround) - (60 * $minutesround);

$hoursround = "0".$hoursround ;

if($secondsroun d < 10)
$secondsround = "0".$secondsrou nd;
if($minutesroun d < 10)
$minutesround = "0".$minutesrou nd;

echo $hoursround. ":". $minutesround. ":".$secondsrou nd;
}

timeDiff($_GET['time']);
?>[/PHP]

[acoder]

Most likely this problem is caused by caching. To prevent it, either disable caching by setting the appropriate headers in the PHP page, or just add a unique timestamp to the end of the URL, e.g.

xmlHttp.open("GET","time.php?time=06:51:00&d="+(new Date()).getTime(),true);

[momukhtar]

Most likely this problem is caused by caching. To prevent it, either disable caching by setting the appropriate headers in the PHP page, or just add a unique timestamp to the end of the URL, e.g.

xmlHttp.open("GET","time.php?time=06:51:00&d="+(new Date()).getTime(),true);

Yup u were right thanks

[acoder]

Excellent. Glad it's working :)

[clain]

JFYI :
The root cause for this is because of the fact that IE caches the page .. since we use the XMLHTTP object.... so a time stamp fixes this...