CSS3实现简单下拉菜单
主页面index.html：
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>CSS3/Javascript 实现简单下来菜单</title>
<link rel="stylesheet" href="css/style.css" media="screen" type="text/css" />
</head>
<body>
<div class="container">
<h1 class="title">Dropdown Menu</h1>
<ul>
<li class="dropdown">
<a href="#" data-toggle="dropdown">First Menu <i class="icon-arrow"></i></a>
<ul class="dropdown-menu">
<li><a href="#">Home</a></li>
<li><a href="#">About Us</a></li>
<li><a href="#">Services</a></li>
<li><a href="#">Contact</a></li>
</ul>
</li>
<li class="dropdown">
<a href="#" data-toggle="dropdown">Second Menu <i class="icon-arrow"></i></a>
<ul class="dropdown-menu">
<li><a href="#">Home</a></li>
<li><a href="#">About Us</a></li>
<li><a href="#">Services</a></li>
<li><a href="#">Contact</a></li>
</ul>
</li>
<li class="dropdown">
<a href="#" data-toggle="dropdown">Third Menu <i class="icon-arrow"></i></a>
<ul class="dropdown-menu">
<li><a href="#">Home</a></li>
<li><a href="#">About Us</a></li>
<li><a href="#">Services</a></li>
<li><a href="#">Contact</a></li>
</ul>
</li>
</ul>
</div>
<script src="js/index.js"></script>
</body>
</html>
样式表css/style.css：
body {
font-family: "Lato", Helvetica, Arial;
font-size: 16px;
}
*, *:before, *:after {
-webkit-border-sizing: border-box;
-moz-border-sizing: border-box;
border-sizing: border-box;
}
.container {
width: 350px;
margin: 50px auto;
}
.container > ul {
list-style: none;
padding: 0;
margin: 0 0 20px 0;
}
.title {
font-family: 'Pacifico';
font-weight: norma;
font-size: 40px;
text-align: center;
line-height: 1.4;
color: #2980b9;
}
.dropdown a {
text-decoration: none;
}
.dropdown [data-toggle="dropdown"] {
position: relative;
display: block;
color: white;
background: #2980b9;
-moz-box-shadow: 0 1px 0 #409ad5 inset, 0 -1px 0 #20638f inset;
-webkit-box-shadow: 0 1px 0 #409ad5 inset, 0 -1px 0 #20638f inset;
box-shadow: 0 1px 0 #409ad5 inset, 0 -1px 0 #20638f inset;
text-shadow: 0 -1px 0 rgba(0, 0, 0, 0.3);
padding: 10px;
}
.dropdown [data-toggle="dropdown"]:hover {
background: #2c89c6;
}
.dropdown .icon-arrow {
position: absolute;
display: block;
font-size: 0.7em;
color: #fff;
top: 14px;
right: 10px;
}
.dropdown .icon-arrow.open {
-moz-transform: rotate(-180deg);
-ms-transform: rotate(-180deg);
-o-transform: rotate(-180deg);
-webkit-transform: rotate(-180deg);
transform: rotate(-180deg);
-moz-transition: -moz-transform 0.6s;
-o-transition: -o-transform 0.6s;
-webkit-transition: -webkit-transform 0.6s;
transition: transform 0.6s;
}
.dropdown .icon-arrow.close {
-moz-transform: rotate(0deg);
-ms-transform: rotate(0deg);
-o-transform: rotate(0deg);
-webkit-transform: rotate(0deg);
transform: rotate(0deg);
-moz-transition: -moz-transform 0.6s;
-o-transition: -o-transform 0.6s;
-webkit-transition: -webkit-transform 0.6s;
transition: transform 0.6s;
}
.dropdown .icon-arrow:before {
content: '\25BC';
}
.dropdown .dropdown-menu {
max-height: 0;
overflow: hidden;
list-style: none;
padding: 0;
margin: 0;
}
.dropdown .dropdown-menu li {
padding: 0;
}
.dropdown .dropdown-menu li a {
display: block;
color: #6e6e6e;
background: #eeeeee;
-moz-box-shadow: 0 1px 0 white inset, 0 -1px 0 #d4d4d4 inset;
-webkit-box-shadow: 0 1px 0 white inset, 0 -1px 0 #d4d4d4 inset;
box-shadow: 0 1px 0 white inset, 0 -1px 0 #d4d4d4 inset;
text-shadow: 0 -1px 0 rgba(255, 255, 255, 0.3);
padding: 10px 10px;
}
.dropdown .dropdown-menu li a:hover {
background: #f6f6f6;
}
.dropdown .show, .dropdown .hide {
-moz-transform-origin: 50% 0%;
-ms-transform-origin: 50% 0%;
-o-transform-origin: 50% 0%;
-webkit-transform-origin: 50% 0%;
transform-origin: 50% 0%;
}
.dropdown .show {
display: block;
max-height: 9999px;
-moz-transform: scaleY(1);
-ms-transform: scaleY(1);
-o-transform: scaleY(1);
-webkit-transform: scaleY(1);
transform: scaleY(1);
animation: showAnimation 0.5s ease-in-out;
-moz-animation: showAnimation 0.5s ease-in-out;
-webkit-animation: showAnimation 0.5s ease-in-out;
-moz-transition: max-height 1s ease-in-out;
-o-transition: max-height 1s ease-in-out;
-webkit-transition: max-height 1s ease-in-out;
transition: max-height 1s ease-in-out;
}
.dropdown .hide {
max-height: 0;
-moz-transform: scaleY(0);
-ms-transform: scaleY(0);
-o-transform: scaleY(0);
-webkit-transform: scaleY(0);
transform: scaleY(0);
animation: hideAnimation 0.4s ease-out;
-moz-animation: hideAnimation 0.4s ease-out;
-webkit-animation: hideAnimation 0.4s ease-out;
-moz-transition: max-height 0.6s ease-out;
-o-transition: max-height 0.6s ease-out;
-webkit-transition: max-height 0.6s ease-out;
transition: max-height 0.6s ease-out;
}
@keyframes showAnimation {
0% {
-moz-transform: scaleY(0.1);
-ms-transform: scaleY(0.1);
-o-transform: scaleY(0.1);
-webkit-transform: scaleY(0.1);
transform: scaleY(0.1);
}
40% {
-moz-transform: scaleY(1.04);
-ms-transform: scaleY(1.04);
-o-transform: scaleY(1.04);
-webkit-transform: scaleY(1.04);
transform: scaleY(1.04);
}
60% {
-moz-transform: scaleY(0.98);
-ms-transform: scaleY(0.98);
-o-transform: scaleY(0.98);
-webkit-transform: scaleY(0.98);
transform: scaleY(0.98);
}
80% {
-moz-transform: scaleY(1.04);
-ms-transform: scaleY(1.04);
-o-transform: scaleY(1.04);
-webkit-transform: scaleY(1.04);
transform: scaleY(1.04);
}
100% {
-moz-transform: scaleY(0.98);
-ms-transform: scaleY(0.98);
-o-transform: scaleY(0.98);
-webkit-transform: scaleY(0.98);
transform: scaleY(0.98);
}
80% {
-moz-transform: scaleY(1.02);
-ms-transform: scaleY(1.02);
-o-transform: scaleY(1.02);
-webkit-transform: scaleY(1.02);
transform: scaleY(1.02);
}
100% {
-moz-transform: scaleY(1);
-ms-transform: scaleY(1);
-o-transform: scaleY(1);
-webkit-transform: scaleY(1);
transform: scaleY(1);
}
}
@-moz-keyframes showAnimation {
0% {
-moz-transform: scaleY(0.1);
-ms-transform: scaleY(0.1);
-o-transform: scaleY(0.1);
-webkit-transform: scaleY(0.1);
transform: scaleY(0.1);
}
40% {
-moz-transform: scaleY(1.04);
-ms-transform: scaleY(1.04);
-o-transform: scaleY(1.04);
-webkit-transform: scaleY(1.04);
transform: scaleY(1.04);
}
60% {
-moz-transform: scaleY(0.98);
-ms-transform: scaleY(0.98);
-o-transform: scaleY(0.98);
-webkit-transform: scaleY(0.98);
transform: scaleY(0.98);
}
80% {
-moz-transform: scaleY(1.04);
-ms-transform: scaleY(1.04);
-o-transform: scaleY(1.04);
-webkit-transform: scaleY(1.04);
transform: scaleY(1.04);
}
100% {
-moz-transform: scaleY(0.98);
-ms-transform: scaleY(0.98);
-o-transform: scaleY(0.98);
-webkit-transform: scaleY(0.98);
transform: scaleY(0.98);
}
80% {
-moz-transform: scaleY(1.02);
-ms-transform: scaleY(1.02);
-o-transform: scaleY(1.02);
-webkit-transform: scaleY(1.02);
transform: scaleY(1.02);
}
100% {
-moz-transform: scaleY(1);
-ms-transform: scaleY(1);
-o-transform: scaleY(1);
-webkit-transform: scaleY(1);
transform: scaleY(1);
}
}
@-webkit-keyframes showAnimation {
0% {
-moz-transform: scaleY(0.1);
-ms-transform: scaleY(0.1);
-o-transform: scaleY(0.1);
-webkit-transform: scaleY(0.1);
transform: scaleY(0.1);
}
40% {
-moz-transform: scaleY(1.04);
-ms-transform: scaleY(1.04);
-o-transform: scaleY(1.04);
-webkit-transform: scaleY(1.04);
transform: scaleY(1.04);
}
60% {
-moz-transform: scaleY(0.98);
-ms-transform: scaleY(0.98);
-o-transform: scaleY(0.98);
-webkit-transform: scaleY(0.98);
transform: scaleY(0.98);
}
80% {
-moz-transform: scaleY(1.04);
-ms-transform: scaleY(1.04);
-o-transform: scaleY(1.04);
-webkit-transform: scaleY(1.04);
transform: scaleY(1.04);
}
100% {
-moz-transform: scaleY(0.98);
-ms-transform: scaleY(0.98);
-o-transform: scaleY(0.98);
-webkit-transform: scaleY(0.98);
transform: scaleY(0.98);
}
80% {
-moz-transform: scaleY(1.02);
-ms-transform: scaleY(1.02);
-o-transform: scaleY(1.02);
-webkit-transform: scaleY(1.02);
transform: scaleY(1.02);
}
100% {
-moz-transform: scaleY(1);
-ms-transform: scaleY(1);
-o-transform: scaleY(1);
-webkit-transform: scaleY(1);
transform: scaleY(1);
}
}
@keyframes hideAnimation {
0% {
-moz-transform: scaleY(1);
-ms-transform: scaleY(1);
-o-transform: scaleY(1);
-webkit-transform: scaleY(1);
transform: scaleY(1);
}
60% {
-moz-transform: scaleY(0.98);
-ms-transform: scaleY(0.98);
-o-transform: scaleY(0.98);
-webkit-transform: scaleY(0.98);
transform: scaleY(0.98);
}
80% {
-moz-transform: scaleY(1.02);
-ms-transform: scaleY(1.02);
-o-transform: scaleY(1.02);
-webkit-transform: scaleY(1.02);
transform: scaleY(1.02);
}
100% {
-moz-transform: scaleY(0);
-ms-transform: scaleY(0);
-o-transform: scaleY(0);
-webkit-transform: scaleY(0);
transform: scaleY(0);
}
}
@-moz-keyframes hideAnimation {
0% {
-moz-transform: scaleY(1);
-ms-transform: scaleY(1);
-o-transform: scaleY(1);
-webkit-transform: scaleY(1);
transform: scaleY(1);
}
60% {
-moz-transform: scaleY(0.98);
-ms-transform: scaleY(0.98);
-o-transform: scaleY(0.98);
-webkit-transform: scaleY(0.98);
transform: scaleY(0.98);
}
80% {
-moz-transform: scaleY(1.02);
-ms-transform: scaleY(1.02);
-o-transform: scaleY(1.02);
-webkit-transform: scaleY(1.02);
transform: scaleY(1.02);
}
100% {
-moz-transform: scaleY(0);
-ms-transform: scaleY(0);
-o-transform: scaleY(0);
-webkit-transform: scaleY(0);
transform: scaleY(0);
}
}
@-webkit-keyframes hideAnimation {
0% {
-moz-transform: scaleY(1);
-ms-transform: scaleY(1);
-o-transform: scaleY(1);
-webkit-transform: scaleY(1);
transform: scaleY(1);
}
60% {
-moz-transform: scaleY(0.98);
-ms-transform: scaleY(0.98);
-o-transform: scaleY(0.98);
-webkit-transform: scaleY(0.98);
transform: scaleY(0.98);
}
80% {
-moz-transform: scaleY(1.02);
-ms-transform: scaleY(1.02);
-o-transform: scaleY(1.02);
-webkit-transform: scaleY(1.02);
transform: scaleY(1.02);
}
100% {
-moz-transform: scaleY(0);
-ms-transform: scaleY(0);
-o-transform: scaleY(0);
-webkit-transform: scaleY(0);
transform: scaleY(0);
}
}
脚本文件js/index.js：
// Dropdown Menu
var dropdown = document.querySelectorAll('.dropdown');
var dropdownArray = Array.prototype.slice.call(dropdown,0);
dropdownArray.forEach(function(el){
var button = el.querySelector('a[data-toggle="dropdown"]'),
menu = el.querySelector('.dropdown-menu'),
arrow = button.querySelector('i.icon-arrow');
button.onclick = function(event) {
if(!menu.hasClass('show')) {
menu.classList.add('show');
menu.classList.remove('hide');
arrow.classList.add('open');
arrow.classList.remove('close');
event.preventDefault();
}
else {
menu.classList.remove('show');
menu.classList.add('hide');
arrow.classList.remove('open');
arrow.classList.add('close');
event.preventDefault();
}
};
})
Element.prototype.hasClass = function(className) {
return this.className && new RegExp("(^|\\s)" + className + "(\\s|$)").test(this.className);
};
本文出自 “IT技术学习与交流” 博客，谢绝转载！