Prototype stores the number of active AJAX requests in Ajax.activeRequestCount. Is there something similar in jQuery/Mootools etc or something that can be used from XMLHttpRequest?. Ideally I need a library independent method of detecting the number of active AJAX requests within a page. If not, a method for each library would suffice.
Prototype only keeps track of the number of active requests made using Prototype APIs. If you were to make an AJAX request using any other method, Ajax.activeRequestCount will not be affected. There is no cross-library way to keep track of every request made, unless you were to keep track of them yourself.