屌炸天-css3水平导航下拉菜单

1. 简介

参考：http://designmodo.com/css3-dropdown-menu/

 本人重新定义了css的样式， 得到了适合自己的css文件

2. 原css文件

style.css

/*HOW TO CREATE A CSS3 DROPDOWN MENU [TUTORIAL]"How to create a CSS3 Dropdown Menu [Tutorial]" was specially made for DesignModo by our friend Valeriu Timbuc.Links:http://vtimbuc.net/https://twitter.com/vtimbuchttp://designmodo.comhttp://vladimirkudinov.com*//* Reset */.menu,.menu ul,.menu li,.menu a {margin: 0;padding: 0;border: none;outline: none;}/* Menu */.menu {height: 40px;width: 505px;background: #4c4e5a;background: -webkit-linear-gradient(top, #4c4e5a 0%,#2c2d33 100%);background: -moz-linear-gradient(top, #4c4e5a 0%,#2c2d33 100%);background: -o-linear-gradient(top, #4c4e5a 0%,#2c2d33 100%);background: -ms-linear-gradient(top, #4c4e5a 0%,#2c2d33 100%);background: linear-gradient(top, #4c4e5a 0%,#2c2d33 100%);-webkit-border-radius: 5px;-moz-border-radius: 5px;border-radius: 5px;}.menu li {position: relative;list-style: none;float: left;display: block;height: 40px;}/* Links */.menu li a {display: block;padding: 0 14px;margin: 6px 0;line-height: 28px;text-decoration: none;border-left: 1px solid #393942;border-right: 1px solid #4f5058;font-family: Helvetica, Arial, sans-serif;font-weight: bold;font-size: 13px;color: #f3f3f3;text-shadow: 1px 1px 1px rgba(0,0,0,.6);-webkit-transition: color .2s ease-in-out;-moz-transition: color .2s ease-in-out;-o-transition: color .2s ease-in-out;-ms-transition: color .2s ease-in-out;transition: color .2s ease-in-out;}.menu li:first-child a { border-left: none; }.menu li:last-child a{ border-right: none; }.menu li:hover > a { color: #8fde62; }/* Sub Menu */.menu ul {position: absolute;top: 40px;left: 0;opacity: 0;background: #1f2024;-webkit-border-radius: 0 0 5px 5px;-moz-border-radius: 0 0 5px 5px;border-radius: 0 0 5px 5px;-webkit-transition: opacity .25s ease .1s;-moz-transition: opacity .25s ease .1s;-o-transition: opacity .25s ease .1s;-ms-transition: opacity .25s ease .1s;transition: opacity .25s ease .1s;}.menu li:hover > ul { opacity: 1; }.menu ul li {height: 0;overflow: hidden;padding: 0;-webkit-transition: height .25s ease .1s;-moz-transition: height .25s ease .1s;-o-transition: height .25s ease .1s;-ms-transition: height .25s ease .1s;transition: height .25s ease .1s;}.menu li:hover > ul li {height: 36px;overflow: visible;padding: 0;}.menu ul li a {width: 100px;padding: 4px 0 4px 40px;margin: 0;border: none;border-bottom: 1px solid #353539;}.menu ul li:last-child a { border: none; }/* Icons */.menu a.documents { background: url(../img/docs.png) no-repeat 6px center; }.menu a.messages { background: url(../img/bubble.png) no-repeat 6px center; }.menu a.signout { background: url(../img/arrow.png) no-repeat 6px center; }

3. 自定义适合自己的css样式

css3-dropdown-menu.css

为保证能正常显示子li元素， 故在

.css3-dropdown-menu, .css3-dropdown-menu ul, .css3-dropdown-menu li, .css3-dropdown-menu a

里添加了一个z-index: 99;

效果如下图：

/*HOW TO CREATE A CSS3 DROPDOWN css3-dropdown-menu [TUTORIAL]"How to create a CSS3 Dropdown css3-dropdown-menu [Tutorial]" was specially made for DesignModo by our friend Valeriu Timbuc.Links:http://vtimbuc.net/https://twitter.com/vtimbuchttp://designmodo.comhttp://vladimirkudinov.com*//* 原文链接：http://designmodo.com/css3-dropdown-menu/ *//* 重置 */.css3-dropdown-menu, .css3-dropdown-menu ul, .css3-dropdown-menu li,.css3-dropdown-menu a {margin: 0;padding: 0;border: none;outline: none;z-index: 99;}/* css3-dropdown-menu */.css3-dropdown-menu {height: 50px;/* width: 505px; */min-width: 700px;width: 900px;background: #4c4e5a;background: -webkit-linear-gradient(top, #4c4e5a 0%, #2c2d33 100%);background: -moz-linear-gradient(top, #4c4e5a 0%, #2c2d33 100%);background: -o-linear-gradient(top, #4c4e5a 0%, #2c2d33 100%);background: -ms-linear-gradient(top, #4c4e5a 0%, #2c2d33 100%);background: linear-gradient(top, #4c4e5a 0%, #2c2d33 100%);-webkit-border-radius: 5px;-moz-border-radius: 5px;border-radius: 5px;}.css3-dropdown-menu li {position: relative;list-style: none;float: left;display: block;height: 50px;}/* Links */.css3-dropdown-menu li a {display: block;padding: 0 25px;margin: 6px 0;line-height: 36px;text-decoration: none;border-left: 1px solid #393942;border-right: 1px solid #4f5058;font-family: Helvetica, Arial, sans-serif;font-weight: bold;font-size: 15px;color: #f3f3f3;text-shadow: 1px 1px 1px rgba(0, 0, 0, .6);-webkit-transition: color .2s ease-in-out;-moz-transition: color .2s ease-in-out;-o-transition: color .2s ease-in-out;-ms-transition: color .2s ease-in-out;transition: color .2s ease-in-out;}.css3-dropdown-menu li:first-child a {border-left: none;}.css3-dropdown-menu li:last-child a {border-right: none;}.css3-dropdown-menu li:hover>a {color: #8fde62;}/* Sub css3-dropdown-menu */.css3-dropdown-menu ul {position: absolute;top: 50px;left: 0;opacity: 0;background: #1f2024;-webkit-border-radius: 0 0 5px 5px;-moz-border-radius: 0 0 5px 5px;border-radius: 0 0 5px 5px;-webkit-transition: opacity .25s ease .1s;-moz-transition: opacity .25s ease .1s;-o-transition: opacity .25s ease .1s;-ms-transition: opacity .25s ease .1s;transition: opacity .25s ease .1s;}.css3-dropdown-menu li:hover>ul {opacity: 1;}.css3-dropdown-menu ul li {height: 0;overflow: hidden;padding: 0;-webkit-transition: height .25s ease .1s;-moz-transition: height .25s ease .1s;-o-transition: height .25s ease .1s;-ms-transition: height .25s ease .1s;transition: height .25s ease .1s;}.css3-dropdown-menu li:hover>ul li {height: 40px;/* 子li元素高度 */overflow: visible;padding: 0;}.css3-dropdown-menu ul li a {width: 150px;line-height: 32px;/* 行高 = 子li元素高度 - padding-top - padding-bottom, 此处： 32px = 40px - 4px -4px */padding: 4px 10px 4px 10px;/* 可知, padding-top:4px, padding-bottom:4px */margin: 0;border: none;font-size: 13px;border-bottom: 1px solid #353539;}.css3-dropdown-menu ul li:last-child a {border: none;}

4. html/jsp文件

index.html

<!DOCTYPE html><html><head><meta charset="UTF-8"><link href="css3-dropdown-menu.css" rel="stylesheet"><title>强大的CSS3下拉菜单</title></head><body><ul class="css3-dropdown-menu">    <li><a href="#">仪表盘</a></li>    <li><a href="#">喜 欢</a></li>    <li><a href="#">视 图</a>        <ul>            <li><a href="#">文 档</a></li>            <li><a href="#">消 息</a></li>            <li><a href="#">GDITC微社区论坛</a></li>        </ul>     </li>    <li><a href="#">上 传</a>    <ul>            <li><a href="#">文 档</a></li>            <li><a href="#">消 息</a></li>            <li><a href="#">GDITC微社区论坛</a></li>        </ul>    </li>    <li><a href="#">视 频</a></li>    <li><a href="#">文 档</a></li></ul></body></html>

5. 预览效果

导航菜单总长度为505px， 可自行加长；导航高度为50px, 父li元素高度为50px, 子li元素为40px. 子li元素内， 行高 = 子li元素高度 - padding-top - padding-bottom, 此处： 32px = 40px - 4px -4px, 还设置了导航条min-width: 700px; 可根据自己喜欢自行修改.