假设我有一个1000px的页面宽度,我的页眉包含10个使用justify-content: space-between
的水平导航元素。如果我将鼠标悬停在nav 1
链接上,一个绝对的菜单div将出现宽度和特定的宽度和left: 0
,如果我悬停在nav 2
上,另一个菜单div将仍然显示left: 0
。但是当我将鼠标悬停在nav 7
或nav 8
上时,如何自动使菜单正确对齐(right: 0
)?
下面是我的html &css的代码片段:
<nav>
<ul>
<li>
<a href="#">Nav menu1</a>
<div class="menu">Content menu 1</div>
</li>
<li>
<a href="#">Nav menu2</a>
<div class="menu">Content menu 2</div>
</li>
<li>
<a href="#">Nav menu3</a>
<div class="menu">Content menu 3</div>
</li>
<li>
<a href="#">Nav menu4</a>
<div class="menu">Content menu 4</div>
</li>
<li>
<a href="#">Nav menu5</a>
<div class="menu">Content menu 5</div>
</li>
<li>
<a href="#">Nav menu6</a>
<div class="menu">Content menu 6</div>
</li>
<li>
<a href="#">Nav menu7</a>
<div class="menu">Content menu 7</div>
</li>
<li>
<a href="#">Nav menu8</a>
<div class="menu">Content menu 8</div>
</li>
<li>
<a href="#">Nav menu9</a>
<div class="menu">Content menu 9</div>
</li>
<li>
<a href="#">Nav menu10</a>
<div class="menu">Content menu 10</div>
</li>
</ul>
</nav>
ul {
display: flex;
font-size: 15px;
height: 100%;
border: solid 1px #ccc;
max-width: 1200px;
margin: 0 auto;
padding: 24px;
align-items: center;
justify-content: space-between;
}
ul > li {
display: flex;
position: relative;
cursor: pointer;
padding-left: 6px;
padding-right: 6px;
height: 40px;
align-items: center;
white-space: nowrap;
list-style: none;
}
.menu {
display: block;
position: absolute;
visibility: hidden;
color: #333;
width: 500px;
background: #fff;
padding: 18px;
min-height: 80px;
box-shadow: 0px 2px 1px -1px rgba(0,0,0,0.2), 0px 1px 1px 0px rgba(0,0,0,0.14), 0px 1px 3px 0px rgba(0,0,0,0.12);
opacity: 0;
transition: all .4s ease;
transition-delay: .3s;
left: 0;
top: 140%;
z-index: 99999;
}
ul > li:hover .menu {
display: block;
visibility: visible;
opacity: 1;
top: 100%;
}
发布于 2019-06-02 10:14:12
您的问题缺少许多信息,包括您正在使用的代码。您可能正在寻找第n个子伪类来定义一个范围。
下面的代码是通用的,因为您没有提供HTML示例,它将影响第6到10个子进程。
CSS:
li:nth-child(n+6):nth-child(-n+10){
right:0;
}
编辑:现在问题更清楚了,更新了答案...
参见下面添加了(vanilla) Javascript的示例。
<!doctype html>
<html>
<head>
<style>
ul{
display:flex;
font-size:15px;
height:100%;
border:solid 1px #ccc;
max-width:1200px;
margin:0 auto;
padding:24px;
align-items:center;
justify-content:space-between;
}
ul > li{
display:flex;
position:relative;
cursor:pointer;
padding-left:6px;
padding-right:6px;
height:40px;
align-items:center;
white-space:nowrap;
list-style:none;
}
.menu{
display:block;
position:absolute;
visibility:hidden;
color:#333;
width:500px;
background:#fff;
padding:18px;
min-height:80px;
box-shadow:0px 2px 1px -1px rgba(0,0,0,0.2), 0px 1px 1px 0px rgba(0,0,0,0.14), 0px 1px 3px 0px rgba(0,0,0,0.12);
opacity:0;
transition:all .4s ease;
transition-delay:.3s;
top:140%;
}
ul > li:hover .menu{
display:block;
visibility:visible;
opacity:1;
top:100%;
}
</style>
</head>
<body>
<nav>
<ul>
<li>
<a href="#">Nav menu1</a>
<div class="menu">Content menu 1</div>
</li><li>
<a href="#">Nav menu2</a>
<div class="menu">Content menu 2</div>
</li><li>
<a href="#">Nav menu3</a>
<div class="menu">Content menu 3</div>
</li><li>
<a href="#">Nav menu4</a>
<div class="menu">Content menu 4</div>
</li><li>
<a href="#">Nav menu5</a>
<div class="menu">Content menu 5</div>
</li><li>
<a href="#">Nav menu6</a>
<div class="menu">Content menu 6</div>
</li><li>
<a href="#">Nav menu7</a>
<div class="menu">Content menu 7</div>
</li><li>
<a href="#">Nav menu8</a>
<div class="menu">Content menu 8</div>
</li><li>
<a href="#">Nav menu9</a>
<div class="menu">Content menu 9</div>
</li><li>
<a href="#">Nav menu10</a>
<div class="menu">Content menu 10</div>
</li>
</ul>
</nav>
<script>
var elems=document.querySelectorAll('div.menu'); //Get NodeList of elements
elems.forEach(function(elem){ //Iterate
var pos=elem.getBoundingClientRect(); //Get element info
let stat=document.elementFromPoint(pos.right,0); //Check position
if(stat===null){ //Will be null if out of viewport
elem.style.right='0'; //Add the right:0; style
}else{
elem.style.left='0'; //Add the left:0; style
}});
</script>
</body>
</html>
编辑2:根据请求,只需更改JavaScript以检查容器。
现在,这将与在文档中找到的第一个<ul>
匹配。您可能希望使用<ul id="cont">
并与id进行匹配:
<script>
//var cont=document.getElementById('cont'); //Match by ID
var cont=document.querySelector('ul'); //Match first <ul>
var posc=cont.getBoundingClientRect(); //Get container info
var elems=document.querySelectorAll('div.menu'); //Get NodeList of elements
elems.forEach(function(elem){ //Iterate
var posv=elem.getBoundingClientRect(); //Get element info
var offset=posc.right-posv.right; //Calculate difference
if(offset<0){ //Will be <0 if out of container
elem.style.right='0'; //Add the right:0; style
}else{
elem.style.left='0'; //Add the left:0; style
}});
</script>
https://stackoverflow.com/questions/56411668
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