position 如何在滚动（置顶）顶部的两个引导导航栏不重叠？
[英]How to position two bootstrap navbar at top on scroll (sticky-top) without overlapping?
问题描述
I used 2 navbar set to top on scroll using bootstrap 4 sticky-top class.
我使用引导程序 4 置顶 class 将 2 个导航栏设置为顶部滚动。 But the problem is 2nd one goes up (overlap) over the 1st one when I scroll and that is why I can not see the 1st one.但问题是当我滚动时，第二个在第一个之上（重叠），这就是为什么我看不到第一个。 2nd One should be placed bellow of the 1st one on scroll.第二个应放在卷轴上第一个的下方。 Is there any way to do that?有没有办法做到这一点？ Sample code:示例代码：
<!DOCTYPE html>
<html lang="en">
<head>
<title>Bootstrap Example</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.2/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.16.0/umd/popper.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.2/js/bootstrap.min.js"></script>
</head>
<body style="height:1500px">
<div class="container-fluid">
<br>
<h3>Sticky Navbar</h3>
<p>A sticky navigation bar stays fixed at the top of the page when you scroll past it.</p>
<p>Scroll this page to see the effect. <strong>Note:</strong> sticky-top does not work in IE11 and earlier.</p>
</div>
<nav class="navbar navbar-expand-sm bg-dark navbar-dark sticky-top">
<a class="navbar-brand" href="#">Logo</a>
<ul class="navbar-nav">
<li class="nav-item">
<a class="nav-link" href="#">Link</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Link</a>
</li>
</ul>
</nav>
<div class="container-fluid"><br>
<p>Some example text. Some example text. Some example text. Some example text. Some example text.</p>
<p>Some example text. Some example text. Some example text. Some example text. Some example text.</p>
<p>Some example text. Some example text. Some example text. Some example text. Some example text.</p>
<p>Some example text. Some example text. Some example text. Some example text. Some example text.</p>
</div>
<nav class="navbar navbar-expand-sm bg-dark navbar-dark sticky-top sticky-top-2">
<a class="navbar-brand" href="#">Logo 2</a>
<ul class="navbar-nav">
<li class="nav-item">
<a class="nav-link" href="#">Link</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Link</a>
</li>
</ul>
</nav>
</body>
</html>
2 个解决方案
解决方案1
1 已采纳 2021-04-25 04:38:00
in bootstrap css, you will find codes like bellow在引导程序 css 中，您会发现如下代码
@supports ((position: -webkit-sticky) or (position: sticky)) {
.sticky-top {
position: -webkit-sticky;
position: sticky;
top: 0px;
z-index: 1020;
}
}
for the 2nd navbar, you can copy the code and paste in additional css or custom css and paste with renaming the class like .sticky-top-2 and set the top: 100px or the height value you set for the 1st navbar and then if you want first navbar should drop down over the 2nd navbar just set the z-index value less then the 1020 like z-index: 1019; for the 2nd navbar, you can copy the code and paste in additional css or custom css and paste with renaming the class like .sticky-top-2 and set the top: 100px or the height value you set for the 1st navbar and then if您希望第一个导航栏应该下拉到第二个导航栏上，只需将 z-index 值设置为小于 1020，例如 z-index: 1019; So, the final code like所以，最终的代码就像
@supports ((position: -webkit-sticky) or (position: sticky)) {
.sticky-top2 {
position: -webkit-sticky;
position: sticky;
top: 100px;
z-index: 1019;
}
}
Now change the HTML code where 2nd navbar has the call of .sticky-top to **现在将第二个导航栏调用.sticky-top的 HTML 代码更改为 **
.sticky-top2
** **
解决方案2
0 2021-04-24 22:51:01
The problem is that both of them have top: 0;问题是它们都有 top: 0; The second navbar must be moved away from the height of the first one.第二个导航栏必须从第一个导航栏的高度移开。
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