问题
Is it possible to have multiple sticky elements stacked on top of each other in pure CSS?
The desired behavior can be seen here: https://webthemez.com/demo/sticky-multi-header-scroll/index.html
Only I'd prefer to use pure CSS, instead of a Javascript implementation. I've experimented a bit with multiple sticky elements, but I can't keep them from pushing out other sticky elements. I've tried placing them in the same stacking context:
#sticky .sticky-1,
#sticky .sticky-2
{
position: sticky;
}
#sticky .sticky-1
{
top: 1em;
z-index: 1;
}
#sticky .sticky-2
{
top: 2em;
z-index: 1;
}
But can't get it to work, as you can see in below . Any insights would be greatly appreciated!
#container
{
display: grid;
grid-template-columns: 50% 50%;
}
#sticky .sticky-1,
#sticky .sticky-2
{
position: sticky;
}
#sticky .sticky-1
{
top: 1em;
z-index: 1;
}
#sticky .sticky-2
{
top: 2em;
z-index: 1;
}
#fixed
{
position: relative;
}
#fixed .sticky-1
{
position: fixed;
top: 0;
}
#fixed .sticky-2
{
position: fixed;
top: 1em;
}<div id="container">
<article id="sticky">
<header>
</header>
<main><h1 class="sticky-1">Sticky heading</h1>
<p>here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. </p>
</main>
<section>
<h2 class="sticky-2">Both headings should stick at the same time.</h2>
<p> And finally a little more copy. And finally a little more copy. And finally a little more copy. And finally a little more copy. And finally a little more copy. And finally a little more copy. And finally a little more copy. And finally a little more copy. And finally a little more copy. And finally a little more copy. And finally a little more copy. And finally a little more copy. And finally a little more copy. And finally a little more copy. And finally a little more copy. And finally a little more copy. And finally a little more copy. And finally a little more copy. And finally a little more copy. And finally a little more copy. And finally a little more copy. And finally a little more copy. And finally a little more copy. And finally a little more copy. And finally a little more copy. And finally a little more copy. And finally a little more copy. And finally a little more copy. And finally a little more copy. And finally a little more copy. And finally a little more copy. 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</section>
</article>
<article id="fixed">
<header>
</header>
<main><h1 class="sticky-1">Fixed heading</h1>
<p>Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. oes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. </p>
</main>
<section>
<h2 class="sticky-2">Another fixed to show how they should stick.</h2>
<p>And finally a little more copy. And finally a little more copy. And finally a little more copy. And finally a little more copy. And finally a little more copy. And finally a little more copy. And finally a little more copy. And finally a little more copy. And finally a little more copy. And finally a little more copy. And finally a little more copy. And finally a little more copy. And finally a little more copy. And finally a little more copy. And finally a little more copy. And finally a little more copy. And finally a little more copy. And finally a little more copy. And finally a little more copy. And finally a little more copy. And finally a little more copy. And finally a little more copy. And finally a little more copy. And finally a little more copy. And finally a little more copy. And finally a little more copy. And finally a little more copy. And finally a little more copy. And finally a little more copy. And finally a little more copy. And finally a little more copy. 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And finally a little more copy. And finally a little more copy. And finally a little more copy. </p>
</section>
</article>
</div>回答1:
You need to make all the elements to stick to the same container (containing block) by adding some offsets.
Here is a basic example where the elements will stick to the body:
body {
margin:0;
min-height:200vh;
border:2px solid;
}
.first {
height:50px;
background:red;
position:sticky;
top:0;
}
.second {
height:50px;
background:blue;
position:sticky;
top:52px;
}
.third {
height:50px;
background:green;
position:sticky;
top:104px;
}<div class="first"></div>
<p>lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum</p>
<div class="second"></div>
<p>lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum</p>
<div class="third"></div>
<p>lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum</p>It will not work if they are in different containers:
body {
margin: 0;
min-height: 300vh;
}
body > div {
border:2px solid;
}
.first {
height: 50px;
background: red;
position: sticky;
top: 0;
}
.second {
height: 50px;
background: blue;
position: sticky;
top: 52px;
}
.third {
height: 50px;
background: green;
position: sticky;
top: 104px;
}<div>
<div class="first"></div>
<p>lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum
lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum</p>
</div>
<div>
<div class="second"></div>
<p>lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum
lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum</p>
</div>
<div>
<div class="third"></div>
<p>lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum
lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum lorem ipsum</p>
</div>A stickily positioned element is an element whose computed position value is sticky. It's treated as relatively positioned until its containing block crosses a specified threshold (such as setting top to value other than auto) within its flow root (or the container it scrolls within), at which point it is treated as "stuck" until meeting the opposite edge of its containing block ref
The most important part here is the last one. So if all the elements aren't in the same container each one will reach the edge of its container and the sticky behavior will stop there. Note how, in the last example, each element will stop moving when reaching the bottom-border of its containing block
In case you want to handle dynamic height you can consider this solution: How can I create different levels of sticky headers?
Another related question to get more details about how sticky works: Why element with position:sticky doesn't stick to the bottom of parent?
回答2:
All you need to do is keep nesting elements with position:sticky into one another. And then set top:2em incrementally to succeeding sticky headers.
Your pen contained two columns so I assumed that you needed two scroll-boxes, Hence the long code snippet.
body {
display: flex;
flex-direction: row;
margin: 0;
padding: 0;
align-items: center;
justify-content: center;
height: 100vh;
background: #222;
}
.mainParent {
height: 90%;
width: 80%;
background: rgba(222, 222, 222, 0.10);
color: #ddd;
overflow-y: scroll;
border: 4px solid #ddd;
}
.mainParent {
margin: 0.5em
}
.header {
position: sticky;
padding: 0.5em;
background: #ddd;
color: #222;
text-align: center;
}
#header01 {
top: 0;
}
#header02 {
top: 2em;
}
#header03 {
top: 4em;
}
#header04 {
top: 6em;
}
#header05 {
top: 8em;
}
.content {
text-align: center
}<div class="mainParent">
<div class="header" id="header01">Header 01</div>
<div id="content01" class="content">
<br><br><br><br><br><br><br><br><br><br><br><br>
<br><br><br><br><br><br><br><br><br>Content 1-1<br><br>
<div class="header" id="header02">Header 02</div>
<div id="content02" class="content">
<br><br><br><br><br><br><br><br><br><br><br><br>
<br><br><br><br><br><br><br><br><br>Content 1-2<br><br>
<div class="header" id="header03">Header 03</div>
<div id="content03" class="content">
<br><br><br><br><br><br><br><br><br><br><br><br>
<br><br><br><br><br><br><br><br><br>Content 1-3<br><br>
<div class="header" id="header04">Header 04</div>
<div id="content04" class="content">
<br><br><br><br><br><br><br><br><br><br><br><br>
<br><br><br><br><br><br><br><br><br>Content 1-4<br><br>
<div class="header" id="header05">Header 05</div>
<div id="content05" class="content">
<br><br><br><br><br><br><br><br><br><br><br><br>
<br><br><br><br><br><br><br><br><br>Peace 🖖
</div>
</div>
</div>
</div>
</div>
</div>
<div class="mainParent">
<div class="header" id="header01">Header 01</div>
<div id="content01" class="content">
<br><br><br><br><br><br><br><br><br><br><br><br>
<br><br><br><br><br><br><br><br><br>Content 2-1<br><br>
<div class="header" id="header02">Header 02</div>
<div id="content02" class="content">
<br><br><br><br><br><br><br><br><br><br><br><br>
<br><br><br><br><br><br><br><br><br>Content 2-2<br><br>
<div class="header" id="header03">Header 03</div>
<div id="content03" class="content">
<br><br><br><br><br><br><br><br><br><br><br><br>
<br><br><br><br><br><br><br><br><br>Content 2-3<br><br>
<div class="header" id="header04">Header 04</div>
<div id="content04" class="content">
<br><br><br><br><br><br><br><br><br><br><br><br>
<br><br><br><br><br><br><br><br><br>Content 2-4<br><br>
<div class="header" id="header05">Header 05</div>
<div id="content05" class="content">
<br><br><br><br><br><br><br><br><br><br><br><br>
<br><br><br><br><br><br><br><br><br>Peace 🖖
</div>
</div>
</div>
</div>
</div>
</div>
</div>You can find this code as pen here.
I hope this answer helps you.
Peace 🖖
来源：https://stackoverflow.com/questions/54689034/pure-css-multiple-stacked-position-sticky