CSS3垂直手风琴折叠菜单

html5trick 分享了很多优秀的前端源码，这里推荐一款CSS3垂直手风琴折叠菜单。

注： 下载源码后需要把jquery.js 重新部署到本地。

该文作者html5tricks，二次转载请注明出处

下面我们来一起看看实现这款手风琴折叠菜单的源代码以及实现思路，主要由HTML代码、CSS代码和jQuery代码组成。

HTML代码

<ul id="accordion" class="accordion">
		<li>
			<div class="link"><i class="fa fa-paint-brush"></i>Diseño web<i class="fa fa-chevron-down"></i></div>
			<ul class="submenu">
				<li><a href="#">Photoshop</a></li>
				<li><a href="#">HTML</a></li>
				<li><a href="#">CSS</a></li>
				<li><a href="#">Maquetacion web</a></li>
			</ul>
		</li>
		<li>
			<div class="link"><i class="fa fa-code"></i>Desarrollo front-end<i class="fa fa-chevron-down"></i></div>
			<ul class="submenu">
				<li><a href="#">Javascript</a></li>
				<li><a href="#">jQuery</a></li>
				<li><a href="#">Frameworks javascript</a></li>
			</ul>
		</li>
		<li>
			<div class="link"><i class="fa fa-mobile"></i>Diseño responsive<i class="fa fa-chevron-down"></i></div>
			<ul class="submenu">
				<li><a href="#">Tablets</a></li>
				<li><a href="#">Dispositivos mobiles</a></li>
				<li><a href="#">Medios de escritorio</a></li>
				<li><a href="#">Otros dispositivos</a></li>
			</ul>
		</li>
		<li><div class="link"><i class="fa fa-globe"></i>Posicionamiento web<i class="fa fa-chevron-down"></i></div>
			<ul class="submenu">
				<li><a href="#">Google</a></li>
				<li><a href="#">Bing</a></li>
				<li><a href="#">Yahoo</a></li>
				<li><a href="#">Otros buscadores</a></li>
			</ul>
		</li>
	</ul>

这里用了ul和li列表实现菜单的层级关系。

CSS代码

.accordion {
 	width: 100%;
 	max-width: 360px;
 	margin: 30px auto 20px;
 	background: #FFF;
 	-webkit-border-radius: 4px;
 	-moz-border-radius: 4px;
 	border-radius: 4px;
 }

.accordion .link {
	cursor: pointer;
	display: block;
	padding: 15px 15px 15px 42px;
	color: #4D4D4D;
	font-size: 14px;
	font-weight: 700;
	border-bottom: 1px solid #CCC;
	position: relative;
	-webkit-transition: all 0.4s ease;
	-o-transition: all 0.4s ease;
	transition: all 0.4s ease;
}

.accordion li:last-child .link {
	border-bottom: 0;
}

.accordion li i {
	position: absolute;
	top: 16px;
	left: 12px;
	font-size: 18px;
	color: #595959;
	-webkit-transition: all 0.4s ease;
	-o-transition: all 0.4s ease;
	transition: all 0.4s ease;
}

.accordion li i.fa-chevron-down {
	right: 12px;
	left: auto;
	font-size: 16px;
}

.accordion li.open .link {
	color: #b63b4d;
}

.accordion li.open i {
	color: #b63b4d;
}
.accordion li.open i.fa-chevron-down {
	-webkit-transform: rotate(180deg);
	-ms-transform: rotate(180deg);
	-o-transform: rotate(180deg);
	transform: rotate(180deg);
}

/**
 * Submenu
 -----------------------------*/
 .submenu {
 	display: none;
 	background: #444359;
 	font-size: 14px;
 }

 .submenu li {
 	border-bottom: 1px solid #4b4a5e;
 }

 .submenu a {
 	display: block;
 	text-decoration: none;
 	color: #d9d9d9;
 	padding: 12px;
 	padding-left: 42px;
 	-webkit-transition: all 0.25s ease;
 	-o-transition: all 0.25s ease;
 	transition: all 0.25s ease;
 }

 .submenu a:hover {
 	background: #b63b4d;
 	color: #FFF;
 }

CSS代码也没什么特点，主要是设置了菜单项下拉的动画以及圆角的效果。

jQuery代码

$(function() {
	var Accordion = function(el, multiple) {
		this.el = el || {};
		this.multiple = multiple || false;

		// Variables privadas
		var links = this.el.find('.link');
		// Evento
		links.on('click', {el: this.el, multiple: this.multiple}, this.dropdown)
	}

	Accordion.prototype.dropdown = function(e) {
		var $el = e.data.el;
			$this = $(this),
			$next = $this.next();

		$next.slideToggle();
		$this.parent().toggleClass('open');

		if (!e.data.multiple) {
			$el.find('.submenu').not($next).slideUp().parent().removeClass('open');
		};
	}	

	var accordion = new Accordion($('#accordion'), false);
});

这部分jQuery代码主要实现了菜单折叠和收拢的功能，非常简单。