带无限滚动的无限侧边栏

Question

我一直在尝试创建一个类似于mydomaine.com的侧边栏，它通过无限滚动动态创建一个粘性侧边栏。问题是当我的侧边栏生成时，旧的侧边栏不会粘在前一个容器的底部，所以它们都跳起来或者新的侧边栏没有附加到文档，这里是代码，我一直在在我周围绞尽脑汁：

(function($) {
var element = $('.follow-scroll'),
    originalY = element.offset().top;

// Space between element and top of screen (when scrolling)
var topMargin = 20;

// Should probably be set in CSS; but here just for emphasis
element.css('position', 'relative');

$(window).on('scroll', function(event) {
    var scrollTop = $(window).scrollTop();

    element.stop(false, false).animate({
        top: scrollTop < originalY
                ? 0
                : scrollTop - originalY + topMargin
    }, 300);