How can I change infinite scroll module to scroll from the bottom to the top of the screen?

Question

Here is the logic of infinite scroll from the top to the bottom of the screen :

height = function (elem) {
    elem = elem[0] || elem;
    if (isNaN(elem.offsetHeight)) {
        return elem.document.documentElement.clientHeight;
    } else {
        return elem.offsetHeight;
    }
};
offsetTop = function (elem) {
    if (!elem[0].getBoundingClientRect || elem.css('none')) {
        return;
    }
    return elem[0].getBoundingClientRect().top + pageYOffset(elem);
};
pageYOffset = function (elem) {
    elem = elem[0] || elem;
    if (isNaN(window.pageYOffset)) {
        return elem.document.documentElement.scrollTop;
    } else {
        return elem.ownerDocument.defaultView.pageYOffset;
    }
}
handler = function () {
    if (container === windowElement) {
        containerBottom = height(container) + pageYOffset(container[0].document.documentElement);
        console.log('height(elem', height(elem))
        elementBottom = offsetTop(elem) + height(elem);
    } else {
        containerBottom = height(container);
        containerTopOffset = 0;
        if (offsetTop(container) !== void 0) {
            containerTopOffset = offsetTop(container);
        }
        elementBottom = offsetTop(elem) - containerTopOffset + height(elem);
    }
    if (useDocumentBottom) {
        elementBottom = height((elem[0].ownerDocument || elem[0].document).documentElement);
    }
    remaining = elementBottom - containerBottom;
    shouldScroll = remaining <= height(container) * scrollDistance + 1;
}

How can I modify my code in order to infinite scroll properly from the bottom to the top of the screen.

I try to do this, i change the hendler function i remove all my code and I do this

elemenTop = pageYOffset(container[0].document.documentElement)
remaining = elemenTop - 250;
shouldScroll = remaining <= height(container) * scrollDistance + 1;

When u test infinite scroll module. if u want to use the scroll bar to go directly to the bottom of the screen it keeps loading the data till u have no data to load.With my modification when I go straight to the top of the screen with the scroll bar it doesn't keep loading my data, it stops to load the data and i have to scroll to make it work again.

I shouldn't have to scroll to make it work again when i'm in the top it should scroll itself since I have all the data loaded