手風琴下拉列表

之前我們已經分享過很多關於手風琴菜單了，有水平方向的，也有垂直方向的。今天要分享的這款CSS3垂直手風琴摺疊菜單也非常不錯，這款CSS3手風琴菜單的每一個菜單項都有小圖標，而且只能有一項展開，更有意思的是，在菜單摺疊和展開式右側的箭頭也會有不錯的動畫效果。

在線演示源碼下載

下面我們來一起看看實現這款手風琴摺疊菜單的源代碼以及實現思路，主要由HTML代碼、CSS代碼和jQuery代碼組成。

HTML代碼：

<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>

這裏用了ul和li列表實現菜單的層級關係。

CSS代碼：

.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代碼也沒什麼特點，主要是設置了菜單項下拉的動畫以及圓角的效果。

jQuery代碼：

$(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);
});