手风琴下拉列表

之前我们已经分享过很多关于手风琴菜单了，有水平方向的，也有垂直方向的。今天要分享的这款CSS3垂直手风琴折叠菜单也非常不错，这款CSS3手风琴菜单的每一个菜单项都有小图标，而且只能有一项展开，更有意思的是，在菜单折叠和展开式右侧的箭头也会有不错的动画效果。

在线演示源码下载

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 privadasvar links = this.el.find('.link');// Eventolinks.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);});