141 lines
2.7 KiB
Markdown
141 lines
2.7 KiB
Markdown
---
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title: Dropdowns
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localeTitle: 下拉菜单
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---
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## 下拉菜单
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下拉列表在CSS中用于隐藏按钮内的预定义列表。
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例子：
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```html
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<div class="dropdown">
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<button class="dropbtn">Name</button>
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<div class="dropdownContent">
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<a href="#">One</a>
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<a href="#">Two</a>
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<a href="#">Three</a>
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</div>
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</div>
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```
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然后你应该在CSS中自定义类
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```css
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.dropdown {
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position: relative;
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display: inline-block;
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}
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.dropbtn {
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background-color: red;
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padding: 10px;
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}
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.dropdown-content {
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display: none;
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position: absolute;
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}
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.dropdown:hover .dropdown-content {
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display:block;
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}
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```
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您需要单独的div类来创建按钮，而另一个div用于分隔按钮所包含的列表。
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#### 一个例子
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```html
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<div id="container">
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<div id="myNav1" class="overlay">
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<div class="overlay-content" id="myNav1-content">
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<div>
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<a href="#" id="list1_obj1" class="list1" >Content 1</a>
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</div>
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<div>
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<a href="#" id="list1_obj2" class="list1" >Content 2</a>
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</div>
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</div>
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</div>
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<div id="myNav2" class="overlay">
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<a href="javascript:void(10)" class="closebtn" onclick="closeNav()">×</a>
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<div class="overlay-content" id="myNav2-content">
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<div>
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<a href="#" id="list2_obj1" class="list2" >Content 3</a>
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</div>
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<div>
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<a href="#" id="list2_obj2" class="list2" >Content 4</a>
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</div>
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<div>
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<a href="#" id="list2_obj3" class="list2" >Content 5</a>
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</div>
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</div>
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</div>
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</div>
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```
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```css
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#myNav1 {
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height: 0;
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width: 50%;
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position: fixed;
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z-index: 6;
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top: 0;
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left: 0;
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background-color: #ffff;
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overflow: hidden;
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transition: 0.3s;
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opacity: 0.85;
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}
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#myNav2 {
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height: 0;
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width: 50%;
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position: fixed;
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z-index: 6;
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bottom: 0;
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right: 0;
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background-color: #ffff;
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overflow: hidden;
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transition: 0.3s;
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opacity: 0.85;
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}
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.overlay-content {
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position: relative;
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width: 100%;
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text-align: center;
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margin-top: 30px;
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}
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#myNav1-content{
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top: 12%;
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left: 5%;
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display: none;
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}
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#myNav2-content{
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top: 12%;
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right: 10%;
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display: none;
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}
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```
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#### 更多信息：
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* W3 School Dropdown Hover Button： [链接到W3学校](https://www.w3schools.com/howto/howto_css_dropdown.asp)
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* W3学校课程： [连结W3学校](https://www.w3schools.com/css/css_dropdowns.asp) |