javascript // what is going on here?

Question

Im looking at a javascript file trying to figure out a timer issue, but im lost as to what exactly is happening here. Could someone break down this code into bite sizes and explain what is going on?

Timer=0;
function countdown(auctionid) {
    var auctions;
    var divs;

    Timer=Timer+1;

    if((Timer%10=="0")||(Timer=="1")) {
        $.get("current.php", {
            id:auctionid
        }, function(data) {
            auctions=data.split("||");
            for(n=0;n<=auctions.length;n++) {
                if(auctions[n] != undefined) {
                    divis=auctions[n].split("##");
                    $('#futu'+divis[0]).html(divis[1]);
                }
            }
        });
    }

    var cauctionid="auctionid";
    var tauctions=auctionid.split("|");
    for(i=0;i<=tauctions.length;i++) {
        if(tauctions[i] != undefined) {
            var dd=$('#futu'+tauctions[i]).text();
            var cdd=dd-1;
            $('#futu'+tauctions[i]).html(cdd);

            dd=dd*1000;
            dday=Math.floor(dd/(60*60*1000*24)*1)
            dhour=Math.floor(dd/(60*60*1000)*1)
            dmin=Math.floor((dd%(60*60*1000))/(60*1000)*1)
            dsec=Math.floor(((dd%(60*60*1000))%(60*1000))/1000*1)

            if(dday==0 && dhour==0 && dmin==0 && dsec==0) {
                $('#Bid'+tauctions[i]).html("SOLD");
                //return
            }
            if(dhour <=9) {
                dhour = "0"+dhour;
            }
            if(dmin <=9) {
                dmin = "0"+dmin;
            }
            if(dsec <=9) {
                dsec = "0"+dsec;
            }

            if(dd>=1000) {
                var valll=dhour+":"+dmin+":"+dsec;
            }

            if(dd<1000) {
                var valll="00:00:00";
            }

            $('#Bid'+tauctions[i]).html(valll);
        }
    }
    refreshID = setTimeout("countdown('"+auctionid+"')", 1000);
}

Answer 1

Every second, this script will update the time left for each of the "auctions" on the page. The second argument to setTimeout() is the time to wait in milliseconds, thus 1000 = 1 second.

Also, on the 1st second, and every 10s afterwards, it will make an AJAX call to retrieve a set of auctions in double-pipe (||) delimited string format. It then updates the corresponding auctions on the page with the data from the server.