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//Since maybe you can start many AJAX requests, I'd argue that one of best solutions - basically, a reliable solution - is first creating an array of requests' state like this:
var ajaxRequestsState = [];
//When you start an AJAX request, you should add an element to this array like this one:
ajaxRequestsState.push({ requestId: "some identifier" });
//Later, if you need to check if there's no active request, you can have a flag like so:
function isAsyncRequestActive() {
return ajaxRequestsState.length > 0;
}
//Finally, whenever a request ends or fails, you must do so:
function releaseRequest(requestId) {
var requestIndex = 0;
var found = false;
while(!found && requestIndex < ajaxRequestsState.length)
{
found = ajaxRequestsState[requestIndex].requestId == requestId;
requestIndex++;
}
if(found) {
ajaxRequestsState.splice((requestIndex-1), 1);
}
}
releaseRequest("identifier of request which ended or failed");
//That's simply tracking requests' state and maintaining a collection of requests' states, and you'll have it!
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