var PageRequestManagerEx =
{
    _initialized: false,


    init: function () {
        if (!PageRequestManagerEx._initialized) {
            var _prm = Sys.WebForms.PageRequestManager.getInstance();
            var _callQueue = new Array();
            var _executingElement = null;


//            window.onscroll = function () {
//                var _yPos = (document.all) ? document.documentElement.scrollTop : window.pageYOffset;
//                $get('yCordHolder').value = _yPos
//            }

//            window.onload = function () {

//            }

            //_prm = Sys.WebForms.PageRequestManager.getInstance();

            _prm.add_initializeRequest(initializeRequest);
            _prm.add_endRequest(endRequest);
            _prm.add_beginRequest(BeginRequestHandler);

            PageRequestManagerEx._initialized = true;
        }

        function BeginRequestHandler(sender, args) {


        }

        function initializeRequest(sender, args) {
            if (_prm.get_isInAsyncPostBack()) {
                //if we are here that means there already a call pending.

                //Get the element which cause the postback
                var postBackElement = args.get_postBackElement();

                //We need to check this otherwise it will abort the request which we made from the
                //end request
                if (_executingElement != postBackElement) {
                    // Grab the event argument value
                    var evArg = $get("__EVENTARGUMENT").value;



                    //Does not match which means it is another control
                    //which request the update, so cancel it temporary and 
                    //add it in the call queue
                    args.set_cancel(true);
                    Array.enqueue(_callQueue, new Array(postBackElement, evArg));
                }



     

                //Reset it as we are done with our matching
                _executingElement = null;
            }
        }

        function endRequest(sender, args) {
            //Check if we have a pending call
            if (_callQueue.length > 0) {
                //Get the first item from the call queue and setting it
                //as current executing item
                _executingElement = Array.dequeue(_callQueue);

                var _element = _executingElement[0];
                var _eventArg = _executingElement[1];

                //Now Post the from which will also fire the initializeRequest


//                var evArg = $get("__EVENTARGUMENT").value;
//                if (evArg == "scrollTo") {
//                    var postBackElement = args.get_postBackElement();
//                    var parent = postBackElement.parentNode;
//                    window.scrollTo(0, parent.offsetTop);

//                }

                //setTimeout(function () { _prm._doPostBack(_element.name, _eventArg); }, 10)
                _prm._doPostBack(_element.name, _eventArg);


      
            }
        }

    }
}

if (typeof (Sys) != 'undefined') {
    Sys.Application.notifyScriptLoaded();
}
PageRequestManagerEx.init();