AJAX , check for changes and do refresh!!

[canabatz]

i got this php file 'check.php' that checks for changes ,and showing a counter for posts !!

$show_data="SELECT * FROM bidding_main WHERE bid_id='$bid_id' ";
$show_data_query=mysql_query($show_data);
$num_show_data=mysql_num_rows($show_data_query);
        $sqlno="SELECT * FROM bidding_details WHERE bid_id=$bid_id ";
$queryno=mysql_query($sqlno);
        echo "<table width='517' border='0' cellspacing='0' cellpadding='0'>";
        echo "    <tr>";
         $rem=$max_bid-$numno;
                        if($rem<=0)
                        {
                        echo "0";
                        }
                        else
                        {
                        echo "<td bgcolor='#FFFFFF' align='center'><font color='red'><b>הצעות לסגירה: $rem </b></font></td>";
                        }"</td>";
        echo "</tr>";
        echo "</table>";

now, i cannot figure it out in ajax how to point the request to check if something as changed when the php file is executed?

how do i get the ajax to check that something as changed?

here is my starting ajax file

function loadXMLDoc(url, callBack) {
    if (window.XMLHttpRequest) {
        req = new XMLHttpRequest();
        req.onreadystatechange = callBack;
        req.open("POST", url, true);
        req.send(null);
    } else if (window.ActiveXObject) {
        req = new ActiveXObject("Microsoft.XMLHTTP");
        if (req) {
            req.onreadystatechange = callBack;
            req.open("POST", url, true);
            req.send();
        }
    }
}
 
 
 
 
 
function RefreshEngine( now)
{  
     var url="check.php"
     if (now) url+='';
 
     loadXMLDoc(url, RefreshResult;
 
}
 
 
 
function RefreshResult ()
 
{
 
    //here im goint to have the second result
 
}

please help me out with this ,it's a week that im serching for result for this ,i tryed million of combinations ,and no success !!

please help or point me to the right direction!!

thanx

[canabatz]

it's reading this php file


i just want it to check if the php file as changed

<?

echo "10";

?>


i want to be able to change it by hend to 11 and it will alert me that something changed!

[canabatz]

this one is working for me heheheheeeh

function MakeRequest()
{
  var xmlHttp = getXMLHttp();
 
  xmlHttp.onreadystatechange = function()
  {
    if(xmlHttp.readyState == 4)
    {
      HandleResponse(xmlHttp.responseText);
    }
  }
 
  xmlHttp.open("GET", "ajax.php", true); 
  xmlHttp.send(null);
  setTimeout('MakeRequest()', 4000);
}
 
 
 
function HandleResponse(response)
{
  if (document.getElementById('ResponseDiv').innerHTML == response)
    {
 
 
 
    }
 
else if (document.getElementById('ResponseDiv').innerHTML = response)
 
    {
 
 
alert("something as changed")
    }
 
}

[acoder]

It works, but probably not in the way you intended. The line

else if (document.getElementById('ResponseDiv').innerHTML = response)

will always be true because you always set the innerHTML and the result is true.

A more meaningful version would be something like:

if (document.getElementById('ResponseDiv').innerHTML != response)
    {
    document.getElementById('ResponseDiv').innerHTML = response;
    alert("something as changed")
    }