[英]Multi-level Hover Navigation Bar with HTML and CSS
因此,我正在查看 w3schools.com 上的代码,并且有一些很好的示例,我正在尝试对它们进行正面或反面。 但他们没有提供关于自定义第三级菜单代码的说明。 有人可以为我分解这段代码,以便我可以随意添加多级菜单吗?
<!doctype html>
<html>
<head>
<meta charset="utf-8" name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">
<title>Title</title>
<style>
body {
font-family: Arial, Helvetica, sans-serif;
}
.navbar {
overflow: hidden;
background-color: #333;
}
.navbar a {
float: left;
font-size: 16px;
color: white;
text-align: center;
padding: 14px 16px;
text-decoration: none;
}
.dropdown {
float: left;
overflow: hidden;
}
.dropdown .dropbtn {
font-size: 16px;
border: none;
outline: none;
color: white;
padding: 14px 16px;
background-color: inherit;
font-family: inherit;
margin: 0;
}
.navbar a:hover, .dropdown:hover .dropbtn {
background-color: red;
}
.dropdown-content {
display: none;
position: absolute;
background-color: #f9f9f9;
min-width: 160px;
box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
z-index: 1;
}
.dropdown-content a {
float: none;
color: black;
padding: 12px 16px;
text-decoration: none;
display: block;
text-align: left;
}
.dropdown-content a:hover {
background-color: #ddd;
}
.dropdown:hover .dropdown-content {
display: block;
}
</style>
</head>
<body>
<div class="navbar">
<a href="#home">Home</a>
<a href="#news">News</a>
<div class="dropdown">
<button class="dropbtn">Dropdown
<i class="fa fa-caret-down"></i>
</button>
<div class="dropdown-content">
<a href="#">Link 1</a>
<a href="#">Link 2</a>
<a href="#">Link 3</a>
</div>
</div>
</div>
<h3>Dropdown Menu inside a Navigation Bar</h3>
<p>Hover over the "Dropdown" link to see the dropdown menu.</p>
</body>
</html>
也有人可以在这里向我解释这段代码在哪里以及如何告诉浏览器导航栏的整体宽度。 我在这里尝试了其他人的代码,导航栏仅停留在 150 像素。 当我更改宽度值时,它全是错误的。 所以我知道我只是不明白这是在代码中确定的。
更新:感谢其中一个答案,我已经弄清楚如何进入三级菜单,并通过让菜单弹出到右侧来摸索。 现在我的问题是它扩展了“Link 3”下的下拉菜单,就好像它为它下面的链接腾出了空间。 我将如何删除它? 这是我当前的代码:
<!doctype html>
<html>
<head>
<meta charset="utf-8" name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">
<title>Title</title>
<style>
body {
font-family: Arial, Helvetica, sans-serif;
}
.navbar {
overflow: hidden;
background-color: #333;
}
.navbar a {
float: left;
font-size: 16px;
color: white;
text-align: center;
padding: 14px 16px;
text-decoration: none;
}
.dropdown {
float: left;
overflow: hidden;
}
.dropdown .dropbtn {
font-size: 16px;
border: none;
outline: none;
color: white;
padding: 14px 16px;
background-color: inherit;
font-family: inherit;
margin: 0;
width: 100%; /*red background color width*/
text-align: start; /*text inside in red background color*/
}
.navbar a:hover, .dropdown:hover .dropbtn {
background-color: red;
}
.dropdown-content-sub {
display: none;
position: relative;
top: -46px;
right: -300px;
background-color: #f9f9f9;
min-width: 160px;
box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
z-index: 1;
width: 300px; /*block width*/
}
.dropdown-content {
display: none;
position: absolute;
background-color: #f9f9f9;
min-width: 160px;
box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
z-index: 1;
width: 300px; /*block width*/
}
.dropdown-content a {
float: none;
color: black;
padding: 12px 16px;
text-decoration: none;
display: block;
text-align: left;
}
.dropdown-content a:hover {
background-color: #ddd;
}
.dropdown:hover .dropdown-content {
display: block;
}
.dropdown-sub:hover .dropdown-content-sub {
display: block;
}
</style>
</head>
<body>
<div class="navbar">
<a href="#home">Home</a>
<a href="#news">News</a>
<div class="dropdown">
<button class="dropbtn">Dropdown
<i class="fa fa-caret-down"></i>
</button>
<div class="dropdown-content">
<a href="#">Link 1</a>
<a href="#">Link 2</a>
<div class="dropdown-sub">
<button class="dropbtn">Link 3
<i class="fa fa-caret-right"></i>
</button>
<div class="dropdown-content-sub">
<a href="#">Link 4</a>
<a href="#">Link 5</a>
<a href="#">Link 6</a>
</div>
</div>
</div>
</div>
</div>
<h3>Dropdown Menu inside a Navigation Bar</h3>
<p>Hover over the "Dropdown" link to see the dropdown menu.</p>
</body>
</html>
更新2最终:所以看来我将第三层的position从绝对更改为相对导致了不良影响。 只需将其切换回来即可解决,现在一切正常。 :) 之后我不得不更改按钮的“顶部”position,但这很容易弄清楚。 现在我应该能够将我的链接放在每个菜单项中,我对 go 很好: :) 谢谢你的帮助!
请参阅 OP 中的更新。 感谢@JannesCarpentier 和另一位匿名用户的帮助。 这是从 w3schools.com 调整的代码,以获得 3 层 hover 导航栏。
<!doctype html>
<html>
<head>
<meta charset="utf-8" name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">
<title>Title</title>
<style>
body {
font-family: Arial, Helvetica, sans-serif;
}
.navbar {
overflow: hidden;
background-color: #333;
}
.navbar a {
float: left;
font-size: 16px;
color: white;
text-align: center;
padding: 14px 16px;
text-decoration: none;
}
.dropdown {
float: left;
overflow: hidden;
}
.dropdown .dropbtn {
font-size: 16px;
border: none;
outline: none;
color: white;
padding: 14px 16px;
background-color: inherit;
font-family: inherit;
margin: 0;
width: 100%; /*red background color width*/
text-align: start; /*text inside in red background color*/
}
.navbar a:hover, .dropdown:hover .dropbtn {
background-color: red;
}
.dropdown-content-sub {
display: none;
position: absolute;
top: 85px;
right: -300px;
background-color: #f9f9f9;
min-width: 160px;
box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
z-index: 1;
width: 300px; /*block width*/
}
.dropdown-content {
display: none;
position: absolute;
background-color: #f9f9f9;
min-width: 160px;
box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
z-index: 1;
width: 300px; /*block width*/
}
.dropdown-content a {
float: none;
color: black;
padding: 12px 16px;
text-decoration: none;
display: block;
text-align: left;
}
.dropdown-content a:hover {
background-color: #ddd;
}
.dropdown:hover .dropdown-content {
display: block;
}
.dropdown-sub:hover .dropdown-content-sub {
display: block;
}
</style>
</head>
<body>
<div class="navbar">
<a href="#home">Home</a>
<a href="#news">News</a>
<div class="dropdown">
<button class="dropbtn">Dropdown
<i class="fa fa-caret-down"></i>
</button>
<div class="dropdown-content">
<a href="#">Link 1</a>
<a href="#">Link 2</a>
<div class="dropdown-sub">
<button class="dropbtn">Link 3
<i class="fa fa-caret-right"></i>
</button>
<div class="dropdown-content-sub">
<a href="#">Link 4</a>
<a href="#">Link 5</a>
<a href="#">Link 6</a>
</div>
</div>
</div>
</div>
</div>
<h3>Dropdown Menu inside a Navigation Bar</h3>
<p>Hover over the "Dropdown" link to see the dropdown menu.</p>
</body>
</html>
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