CSS位置贴纸不适用于所有潜水

Question

我正在做我的一个项目，为此我想让搜索栏变得有粘性，因为我已经写了一个JS代码，但问题是搜索栏似乎在"上下文部分"；只是，它不粘/工作在"；边栏&页脚"；。我想在比赛结束后把它粘在全身上。

我也尝试过"；位置：固定"而不是"；位置：粘性"它在固定位置工作得很好，但在固定位置，搜索栏会在体外(即使"溢出：隐藏"不工作(，这就是我使用粘性位置的原因。

如何解决此问题？

const searchBAR = document.querySelector('.search-bar');
let navTop = searchBAR.offsetTop;
function stickySearchBar() {
if (window.scrollY >= navTop) {
searchBAR.classList.add('fixed');
} else {
searchBAR.classList.remove('fixed');
}
}
window.addEventListener('scroll', stickySearchBar);

.search-bar {
width: 100%;
position: relative;
display: flex;
}
.search-term {
width: 100%;
max-height: 36px;
border: 3px solid black;
border-right: none;
padding: 5px;
border-radius: 5px 0 0 5px;
outline: none;
color: #9DBFAF;
}
.search-term:focus {
color: black;
}
.search-btn {
width: 40px;
height: 36px;
border: 1px solid black;
background: black;
text-align: center;
color: #fff;
border-radius: 0 5px 5px 0;
cursor: pointer;
font-size: 20px;
}
.fixed {
position: sticky;
top: 0;
}
main .content-section,
main .sidebar-section {
background-color: skyblue;
padding: 15px;
height: auto;
}
.main-section {
margin: 0 auto;
display: grid;
grid-gap: 0px;
grid-template-columns: 70% 30%;
}
@media (max-width: 600px) {
.main-section {
grid-template-columns: 100%;
}
}

<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">
<div class="main" style="width: 400px;">
<header style="width: 100%; height:200px; background-color: skyblue;">
HEADER SECTION
</header>
<div class="main-section">
<div class="content-section">
<div class="search-bar">
<input type="text" class="search-term" placeholder="Search Here...">
<button type="submit" class="search-btn">
<i class="fa fa-search"></i>
</button>
</div>
<div style="width: 100%; height: 1000px; background-color: pink;">
CONTENT SECTION
</div>
</div>
<div class="sidebar-section">
<div style="width: 100%; height:1000px; background-color: yellow;">
SIDE-BAR SECTION
</div>
</div>
</div>
<footer style="width: 100%; height:200px; background-color: blue;">
FOOTER SECTION
</footer>
</div>

Answer 1

您可以将search-bar放在最外面的div中，这样它就可以包括header和footer

const searchBAR = document.querySelector('.search-bar');
let navTop = searchBAR.offsetTop;
function stickySearchBar() {
if (window.scrollY >= navTop) {
searchBAR.classList.add('fixed');
} else {
searchBAR.classList.remove('fixed');
}
}
window.addEventListener('scroll', stickySearchBar);

.search-bar {
width: 100%;
position: relative;
display: flex;
}
.search-term {
width: 100%;
max-height: 36px;
border: 3px solid black;
border-right: none;
padding: 5px;
border-radius: 5px 0 0 5px;
outline: none;
color: #9DBFAF;
}
.search-term:focus {
color: black;
}
.search-btn {
width: 40px;
height: 36px;
border: 1px solid black;
background: black;
text-align: center;
color: #fff;
border-radius: 0 5px 5px 0;
cursor: pointer;
font-size: 20px;
}
.fixed {
position: sticky;
top: 0;
}
main .content-section,
main .sidebar-section {
background-color: skyblue;
padding: 15px;
height: auto;
}
.main-section {
margin: 0 auto;
display: grid;
grid-gap: 0px;
grid-template-columns: 70% 30%;
}
@media (max-width: 600px) {
.main-section {
grid-template-columns: 100%;
}
}

<div class="main" style="width: 400px;">
<div class="search-bar">
<input type="text" class="search-term" placeholder="Search Here...">
<button type="submit" class="search-btn">
<i class="fa fa-search"></i>
</button>
</div>
<header style="width: 100%; height:200px; background-color: skyblue;">
HEADER SECTION
</header>
<div class="main-section">
<div class="content-section">
<!-- <div class="search-bar">
<input type="text" class="search-term" placeholder="Search Here...">
<button type="submit" class="search-btn">
<i class="fa fa-search"></i>
</button>
</div> -->
<div style="width: 100%; height: 1000px; background-color: pink;">
CONTENT SECTION
</div>
</div>
<div class="sidebar-section">
<div style="width: 100%; height:1000px; background-color: yellow;">
SIDE-BAR SECTION
</div>
</div>
</div>
<footer style="width: 100%; height:200px; background-color: blue;">
FOOTER SECTION
</footer>
</div>