flow control with jQuery and ajax: Identify which response belongs to which call

Question

I want to identify which response belongs to which (async) call. In my client web application I have a list of items. Every time the user navigates to an item the application makes an ajax-call to check if the item is up to date. If the user navigates very fast there are several calls (with the same callback-function) waiting for a response. Is there a way in jQuery to identify which response belongs to which call? Or do I have to implement it myself?

Answer 1

So I just found a plugin which seems to solve my problem:

http://docs.jquery.com/AjaxQueue (but there is no download-link today)

I found this way to identify which response belongs to which call:

        var xhr = $.ajax({
            type: 'GET',
            url: 'service.php',
            dataType: 'json',                
            data: data,
            async: true,
            timeout: 1000,
            success: function(xhr)
            {
                alert('success with callID: ' + xhr.callID);
            },
            error: function(xhr)
            {
                alert('error with callID: ' + xhr.callID);
            },
            complete: function(xhr)
            {
                alert('completed callID: ' + xhr.callID);
            }
        });
        xhr.callID = ++seqNo;
        xhr.itemID = ID;

With this information it should be possible to build my own queue.