越来越多的开发者喜欢将单页面尤其像产品介绍页面设计成用一个简单的导航条关联的页面各个重要部分(节点)。本例中,一个页面由多个重要节点组成,在页面一侧会垂直展示多个简单的导航远点,滑上圆点会展示对应节点部分的名称,点击页面会滚动到对应的节点部分,而导航条位置固定不变。
查看演示 下载源码
当屏幕足够小时(如手机移动设备),会在屏幕右下角展示一个图标,触控图标,则会展开导航菜单,点击菜单页面会滚动到对应的节点,效果非常酷。
HTML
我们的导航条是一个无序列表ul,包含在nav.cd-vertical-nav内,通过连接a#section1关联到对应的节点。元素button.cd-nav-trigger是用来作为小屏幕设备上的用来触发菜单的按钮。section.cd-section就是用来对应导航节点的内容。
<nav class="cd-vertical-nav"> <ul> <li><a href="#section1" class="active"><span class="label">Intro</span></a></li> <li><a href="#section2"><span class="label">Events</span></a></li> <!-- additional navigation items here --> </ul></nav> <button class="cd-nav-trigger cd-image-replace">Open navigation<span aria-hidden="true"></span></button> <section id="section1" class="cd-section"> <div class="content-wrapper"> <h1 id="垂直固定导航">垂直固定导航</h1> <a href="#section2" class="cd-scroll-down cd-image-replace">scroll down</a> </div></section> <section id="section2" class="cd-section"> <div class="content-wrapper"> <!-- section content here --> </div></section>
CSS
HTML结构部署好后,我们要为页面添加必要的CSS样式。在非常小的屏幕下(视图宽度小于800px),我们将.cd-nav-trigger和
.cd-nav-trigger { display: block; position: fixed; z-index: 2; bottom: 30px; right: 5%;} .cd-vertical-nav { position: fixed; z-index: 1; right: 5%; bottom: 30px; transform: scale(0); transform-origin: right bottom; transition: transform 0.2s;}.cd-vertical-nav.open { transform: scale(1);}
那么在大的屏幕设备上,我们首先是要 Modernizr 来检测当前使用的设备是否支持触屏,在非触控屏上会有鼠标滑上的效果。我们将右侧的垂直导航条设置为固定的高度和宽度,并将其固定在页面右侧。默认右侧导航之显示几个圆点,当鼠标滑上圆点时,导航条会打开,可以选择导航菜单。
@media only screen and (min-width: 800px) { .cd-vertical-nav { right: 0; top: 0; height: 100vh; width: 90px; } .cd-vertical-nav::before { /* this is the navigation background */ content: ''; position: absolute; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0, 0, 0, 0.8); transform: translateX(100%); transition: transform 0.4s; } .no-touch .cd-vertical-nav:hover::before, .touch .cd-vertical-nav::before { transform: translateX(0); } .cd-vertical-nav .label { display: block; transform: translateX(100%); transition: transform 0.4s; } .no-touch .cd-vertical-nav:hover .label, .touch .cd-vertical-nav .label { transform: translateX(0); }}
为了创建圆点和图标,可以使用::after和::before来为a元素添加伪类。
@media only screen and (min-width: 800px) { .cd-vertical-nav a { position: relative; padding: 3em 0 0; margin: 1.4em auto; } .cd-vertical-nav a::before, .cd-vertical-nav a::after { /* used to create the filled circle and the background icon */ content: ''; position: absolute; left: 50%; transition: transform 0.4s 0s; } .cd-vertical-nav a::before { /* filled circle */ top: 0; height: 32px; width: 32px; border-radius: 50%; background: #eaf2e3; transform: translateX(-50%) scale(0.25); } .cd-vertical-nav a::after { /* icon */ top: 8px; height: 16px; width: 16px; background: url(../img/cd-nav-icons.svg) no-repeat; transform: translateX(-50%) scale(0); } .no-touch .cd-vertical-nav:hover a::before, .no-touch .cd-vertical-nav:hover a::after, .touch .cd-vertical-nav li:nth-of-type(n) a::before, .touch .cd-vertical-nav li:nth-of-type(n) a::after { transform: translateX(-50%) scale(1); }}
当然到这里效果已经实现了,但是要实现点击导航菜单时页面做平滑滚动效果则需要借助jQuery来实现滚动动画。本例在下载源码包里已经打包了包含的全部jQuery代码,请大家下载后查看,本文不再描述。

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