gistfile1.txt

  onScroll : function(scroller, X,Y) {
        if (this.getLoading()) {
            return;
        }

        var element      = this.element,
            cmpWidth     = element.getWidth(),
            innerElWidth = element.down('.x-inner').getWidth(),
            scrollPct    = (X / (innerElWidth - cmpWidth));

        if (scrollPct >.75) {
            console.log('DO LOAD');
            this.fetchData();
        }

    },