类似Facebook的响应菜单

毫无疑问,响应技术变得越来越受欢迎。这让我们节省时间当我们开发设计用于使用各种设备:从移动设备到宽屏电脑。不需要开发一个特殊版本的网站为每个格式(设备)。今天,我们将创建一个新的响应菜单看起来像facebook菜单。创建这个菜单,我们不需要javascript,一切实现仅使用CSS3(IE7-IE10、Firefox、Opera,Safari,Chrome和iPad / iPod / iPhone)。
HTML
<ul id="nav">
    <li><a href="#">Home</a></li>
    <li class="subs"><a href="#s1">Menu 1</a>
        <ul>
            <li><a href="#">Submenu A</a></li>
            <li><a href="#">Submenu B</a></li>
            <li><a href="#">Submenu C</a></li>
            <li><a href="#">Submenu D</a></li>
        </ul>
    </li>
    <li class="subs"><a href="#s2">Menu 2</a>
        <ul>
            <li><a href="#">Submenu E</a></li>
            <li><a href="#">Submenu F</a></li>
            <li><a href="#">Submenu G</a></li>
            <li><a href="#">Submenu H</a></li>
        </ul>
    </li>
    <li><a href="#">Menu 3</a></li>
    <li><a href="#">Menu 4</a></li>
    <li><a href="#">Menu 5</a></li>
</ul>
一切都在这个阶段应该清楚。创建第一个版本(使用选择器)我们必须添加这个元素(菜单)以下:

<select id="nav_v2" onchange="window.location.href = this.options[this.selectedIndex].value">
    <option selected="selected" value="">Choise Page...</option>
    <option value="#">Submenu 1</option>
    <option value="#">Submenu A</option>
    <option value="#">Submenu B</option>
    <option value="#">Submenu C</option>
    <option value="#">Submenu D</option>
    <option value="#">Submenu 2</option>
    <option value="#">Submenu E</option>
    <option value="#">Submenu F</option>
    <option value="#">Submenu G</option>
    <option value="#">Submenu H</option>
    <option value="#">Submenu 3</option>
    <option value="#">Submenu 4</option>
    <option value="#">Submenu 5</option>
</select>
默认情况下,这个选择器是隐藏的。可见只有小型设备(由于其响应规则)
CSS
* {
    margin: 0;
    padding: 0;
}
html {
    background-color: #E9EAED;
    height: 100%;
}
body {
    color: #333333;
    font-family: 'Helvetica Neue',Helvetica,Arial,'lucida grande',tahoma,verdana,arial,sans-serif;
}

/* other elements */
#nav_v2 {
    display: none;
}
现在,我们可以准备顶级风格元素:
/* top level elements */
#nav, #nav ul {
    list-style: none outside none;
    margin: 0;
    padding: 0;
}
#nav {
    background-color: rgb(78,105,162);
    background: -moz-linear-gradient(top, rgba(78,105,162,1) 0%, rgba(59,88,152,1) 100%);
    background: -webkit-gradient(left top, left bottom, color-stop(0%, rgba(78,105,162,1)), color-stop(100%, rgba(59,88,152,1)));
    background: -webkit-linear-gradient(top, rgba(78,105,162,1) 0%, rgba(59,88,152,1) 100%);
    background: -o-linear-gradient(top, rgba(78,105,162,1) 0%, rgba(59,88,152,1) 100%);
    background: -ms-linear-gradient(top, rgba(78,105,162,1) 0%, rgba(59,88,152,1) 100%);
    background: linear-gradient(to bottom, rgba(78,105,162,1) 0%, rgba(59,88,152,1) 100%);

    border-bottom: 1px solid #3A4B7B;
    height: 22px;
    padding: 10px 0 10px 5px;
    position: relative;
}
#nav > li {
    float: left;
    height: 22px;
    padding-right: 6px;
    position: relative;
    text-align: left;
}
#nav > li > a {
    border: 1px solid transparent;
    color: #FFFFFF;
    display: block;
    font-size: 12px;
    font-weight: bold;
    height: 27px;
    line-height: 27px;
    margin: -3px 0 0 -1px;
    padding: 0 1px 0 11px;
    text-decoration: none;
    text-shadow: 0 -1px rgba(0, 0, 0, 0.5);
}
#nav > li:hover > a, #nav > a:hover {
    background-color: #425691;
    border-radius: 2px 2px 2px 2px;
    color: #FFFFFF;
    margin-right: -8px;
    padding: 0 9px 0 11px;
    position: relative;
    z-index: 1;
}
#nav > li.subs:hover > a {
    background-color: #FFFFFF;
    border: 1px solid rgba(100, 100, 100, 0.4);
    border-bottom-width: 0;
    border-radius: 2px 2px 0 0;
    color: #000000;
    text-shadow: 0 0 transparent;
    z-index: 2;
}
菜单上有蓝色渐变线,所有的元素都是浮动,左对齐(横向并排)。下一个元素是一个菜单元素之间的分隔符:
/* top items separator */
#nav > li:after {
    background-color: #405791;
    content: "";
    height: 17px;
    left: 1px;
    position: absolute;
    top: 2px;
    width: 1px;
}
#nav > li:first-child:after {
    background-color: transparent;
}
完成菜单,我们需要添加子菜单的样式(下拉):
/* submenu */
#nav ul {
    background-color: #FFFFFF;
    border: 1px solid rgba(100, 100, 100, 0.4);
    *border: 1px solid rgb(100, 100, 100);
    border-radius: 0 0 3px 3px;
    box-shadow: 0 3px 8px rgba(0, 0, 0, 0.25);
    display: none;
    left: -1px;
    margin-top: 2px;
    min-width: 200px;
    padding: 6px 0;
    position: absolute;
    top: 100%;
    z-index: 1;
}
#nav li:hover ul {
    display: block;
}
#nav ul li a {
    border-bottom: 1px solid transparent;
    border-top: 1px solid transparent;
    color: #232B37;
    display: block;
    font-size: 12px;
    line-height: 20px;
    padding: 0 22px;
    text-decoration: none;
    text-overflow: ellipsis;
    white-space: nowrap;
}
#nav ul li a:hover {
    background-color: #6D84B4;
    border-bottom: 1px solid #3B5998;
    border-top: 1px solid #3B5998;
    color: #FFFFFF;
}
就这样。菜单已经准备好了,我们可以开始添加响应方式(使用媒体查询)。
/* responsive rules */
@media all and (max-width : 980px) {

    #nav {
        display: none;
    }
    #nav_v2 {
        background-color: rgb(78,105,162);
        border: 1px solid #3A4B7B;
        color: #FFFFFF;
        cursor: pointer;
        display: block;
        margin-bottom: 30px;
        padding: 6px;
        width: 100%;
    }
    #nav_v2 select {
        color: #FFFFFF;
        cursor: pointer;
    }
}