我想创建一个div，它位于一个内容块的下面，但一旦页面已经滚动到足以接触其顶部边界，就会固定在原地并与页面滚动。
当前回答
粘到页脚碰到div:
function stickyCostSummary() {
var stickySummary = $('.sticky-cost-summary');
var scrollCostSummaryDivPosition = $(window).scrollTop();
var footerHeight = $('#footer').height();
var documentHeight = $(document).height();
var costSummaryHeight = stickySummary.height();
var headerHeight = 83;
var footerMargin = 10;
var scrollHeight = 252;
var footerPosition = $('#footer').offset().top;
if (scrollCostSummaryDivPosition > scrollHeight && scrollCostSummaryDivPosition <= (documentHeight - footerHeight - costSummaryHeight - headerHeight - footerMargin)) {
stickySummary.removeAttr('style');
stickySummary.addClass('fixed');
} else if (scrollCostSummaryDivPosition > (documentHeight - footerHeight - costSummaryHeight - headerHeight - footerMargin)) {
stickySummary.removeClass('fixed');
stickySummary.css({
"position" : "absolute",
"top" : (documentHeight - footerHeight - costSummaryHeight - headerHeight - footerMargin - scrollHeight) + "px"
});
} else {
stickySummary.removeClass('fixed');
stickySummary.css({
"position" : "absolute",
"top" : "0"
});
}
}
$window.scroll(stickyCostSummary);
其他回答
这就是我用jquery做的。这都是根据堆栈溢出的各种答案拼凑起来的。这个解决方案缓存选择器以获得更快的性能，并且还解决了当粘性div变得粘性时的“跳跃”问题。
在jsfiddle: http://jsfiddle.net/HQS8s/上查看它
CSS:
.stick {
position: fixed;
top: 0;
}
JS:
$(document).ready(function() {
// Cache selectors for faster performance.
var $window = $(window),
$mainMenuBar = $('#mainMenuBar'),
$mainMenuBarAnchor = $('#mainMenuBarAnchor');
// Run this on scroll events.
$window.scroll(function() {
var window_top = $window.scrollTop();
var div_top = $mainMenuBarAnchor.offset().top;
if (window_top > div_top) {
// Make the div sticky.
$mainMenuBar.addClass('stick');
$mainMenuBarAnchor.height($mainMenuBar.height());
}
else {
// Unstick the div.
$mainMenuBar.removeClass('stick');
$mainMenuBarAnchor.height(0);
}
});
});
这里还有一个版本供那些对其他版本有问题的人尝试。它结合了这个重复问题中讨论的技术，并动态生成所需的帮助器div，因此不需要额外的HTML。
CSS:
.sticky { position:fixed; top:0; }
JQuery:
function make_sticky(id) {
var e = $(id);
var w = $(window);
$('<div/>').insertBefore(id);
$('<div/>').hide().css('height',e.outerHeight()).insertAfter(id);
var n = e.next();
var p = e.prev();
function sticky_relocate() {
var window_top = w.scrollTop();
var div_top = p.offset().top;
if (window_top > div_top) {
e.addClass('sticky');
n.show();
} else {
e.removeClass('sticky');
n.hide();
}
}
w.scroll(sticky_relocate);
sticky_relocate();
}
要使元素具有粘性，请执行以下操作:
make_sticky('#sticky-elem-id');
当元素变得粘滞时，代码管理剩余内容的位置，以防止它跳到粘滞元素留下的间隙中。当滚动到粘滞元素上方时，它还将粘滞元素返回到其原始的非粘滞位置。
粘到页脚碰到div:
function stickyCostSummary() {
var stickySummary = $('.sticky-cost-summary');
var scrollCostSummaryDivPosition = $(window).scrollTop();
var footerHeight = $('#footer').height();
var documentHeight = $(document).height();
var costSummaryHeight = stickySummary.height();
var headerHeight = 83;
var footerMargin = 10;
var scrollHeight = 252;
var footerPosition = $('#footer').offset().top;
if (scrollCostSummaryDivPosition > scrollHeight && scrollCostSummaryDivPosition <= (documentHeight - footerHeight - costSummaryHeight - headerHeight - footerMargin)) {
stickySummary.removeAttr('style');
stickySummary.addClass('fixed');
} else if (scrollCostSummaryDivPosition > (documentHeight - footerHeight - costSummaryHeight - headerHeight - footerMargin)) {
stickySummary.removeClass('fixed');
stickySummary.css({
"position" : "absolute",
"top" : (documentHeight - footerHeight - costSummaryHeight - headerHeight - footerMargin - scrollHeight) + "px"
});
} else {
stickySummary.removeClass('fixed');
stickySummary.css({
"position" : "absolute",
"top" : "0"
});
}
}
$window.scroll(stickyCostSummary);
为回答这个问题提供的信息可能对你有帮助，埃文:
检查滚动后元素是否可见
基本上，只有在验证document.body.scrollTop值等于或大于元素的顶部之后，才希望修改元素的样式，将其设置为fixed。
最简单的解决方案(没有js): 演示
.container {
position: relative;
}
.sticky-div {
position: sticky;
top: 0;
}
<div class="container">
<h1>
relative container & sticky div
</h1>
<div class="sticky-div"> this row is sticky</div>
<div>
content
</div>
</div>
