Question

I’m trying to get setTimeout to re-run the function it’s inside after 15 seconds, it’s not waiting 15 seconds and just doing it in a constant loop.

Here’s my current code

function checkSession(x) {
http.abort();
http.open("GET", siteURL+"processes/ajax.php?call=check_session&string="+x+"&new="+Math.random(), true);
http.onreadystatechange = function() {
    if(http.readyState == 4) {
        if(http.responseText == true) {
            updateSession(x);
        } else {
            setTimeout(checkSession(x),15000);
        }
    }
}
http.send(null);
}

I don’t see any problems in the code itself, the only thing wrong is that it’s just doing a constant loop without waiting the “15000” miliseconds.

Answer 1

change the setTimeout call to:

setTimeout(function(){checkSession(x)},15000);

As you have it now, checkSession is called immediately and then passed as an argument to setTimeout. Wrapping it inside the function allows for the call to be deferred.