HTML CSS下拉菜单 [英] html css dropdown menu

问题描述

这是我第一次发布Stack Overflow，并且我并不熟悉发布论坛规则。所以请让我知道我做错了什么。我在论坛上研究过这个问题，我遇到的问题都没有给我一个明确的答案。

我试图从News元素创建一个下拉菜单，但运行代码时我从来没有看到任何可见的结果。我试图将 .dropdown-content 的显示值更改为 block 看看它是否会使列表可见，但没有显示。我缺少什么？

font-size：100％;宽度：80％;保证金：汽车; font-family：Palatino，Palatino，Arial;}＃top {background-color：black;白颜色; padding-left：10px;边框：2px纯白色; font-family：铜板，铜版哥特式光，幻想;不透明度：0.85; padding-left：25px;}＃menu {list-style-type：none;保证金：0;填充：0;溢出：隐藏; background-color：＃333;位置：固定; width：80％;} li {float：left;}＃login {float：right; padding-right：20px;} li a {display：block;白颜色;文字修饰：无; text-align：center; padding：14px 16px;} li a：hover {background-color：white; color：black;} li.dropdown {display：inline-block;}。dropdown-content {display：none;位置：绝对; background-color：＃f9f9f9; min-width：160px; box-shadow：0px 8px 16px 0px rgba（0,0,0,0,2）; padding：12px 16px; z-index：1;}。dropdown-content a {display：block;文字修饰：无; padding：12px 16px; color：black;}。dropdown：hover .dropdown-content {display：block;}＃bio {}＃bottom {}

 < div id =nav>< ul style =list-style-type：noneid =menu> < li>< a href =home.html>主页< / a>< / li> < li class =dropdown>< a class =dropbtnhref =＃>新闻< / a> < div class =dropdown-content> < a href =＃>游戏< / a> < a href =＃>网页设计< / a> < a href =＃>旅游< / a> < / DIV> < /锂> <！ - 为联系人信息创建指向同一页面部分的链接 - > < li>< a href =＃bottom>联络资讯< / a>< / li> < i href =login.html>登录< / a>< / li>< / ul>< / div>  
 
 
        解决方案

您可以将位置：fixed; 添加到 #nav 并更改 #menu from width：80％; to width：100％;

以下是 JS小提琴。

希望有所帮助！

This is my first ever post to Stack Overflow and I'm not familiar with forum regulations with posting. So please let me know anything that I have done wrong. I have researched this issue in the forums and nothing I've come across gives me a clear answer.

I am trying to create a dropdown menu from the "News" element, but I never get any visible result when running the code. I tried to change the .dropdown-content's display value to block to see if it would make the list visible, but nothing showed. What am I missing?

body{
	background-image: url("images/seamless-panda-bear-pattern.jpg");
	font-size: 100%;
	width: 80%;
	margin: auto;
	font-family: Palatino,"Palatino", Arial;

}

#top{
	background-color: black;
	color: white;
	padding-left: 10px;
	border: 2px solid white;
	font-family: Copperplate,"Copperplate Gothic Light",fantasy;
	opacity: 0.85;
	padding-left: 25px;
}

#menu{
	list-style-type: none;
	margin: 0;
	padding: 0;
	overflow: hidden;
	background-color: #333;
	position: fixed;
	width: 80%;
}
li{
	float: left;
}

#login{
	float: right;
	padding-right: 20px;
}

li a{
	display: block;
	color: white;
	text-decoration: none;
	text-align: center;
	padding: 14px 16px;

}
li a:hover{
	background-color: white;
	color: black;
}

li.dropdown{
	display: inline-block;
}

.dropdown-content{
	display: none;
	position: absolute;
	background-color: #f9f9f9;
	min-width: 160px;
	box-shadow: 0px 8px 16px 0px rgba(0,0,0,0,2);
	padding: 12px 16px;
	z-index: 1;
}

.dropdown-content a{
	display: block;
	text-decoration: none;
	padding: 12px 16px;
	color: black;
}

.dropdown:hover .dropdown-content{
	display: block;
}


#bio{

}

#bottom{

}

<div id="nav">
<ul style="list-style-type: none" id="menu">
	<li><a href="home.html">Home</a></li>
	<li class="dropdown"><a class="dropbtn" href="#">News</a>
		<div class="dropdown-content">
			<a href="#">Games</a>
			<a href="#">Web Design</a>
			<a href="#">Travel</a>
		</div>
	</li>
	<!-- create a link to a part of the same page for contact info -->
	<li><a href="#bottom">Contact info</a></li>
	<li id="login"><a href="login.html">Log In</a></li>
</ul>
</div>

解决方案

To solve your position fixed issue. You can add position: fixed; to #nav and change the width on #menu from width: 80%; to width: 100%;

Here's a JS Fiddle.

Hope that helped!

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