纯CSS子菜单垂直

Question

我得到了一个带有此代码的css3菜单：

HTML：

<div id="navi">
    <ul>
        <li><a href="#">First</a></li>
        <li class="active"><a href="#">Second</a>
            <ul class="child">
                <li><a href="#">First child</a></li>
            </ul>
        </li>
        <li><a href="#">Third</a></li>
    </ul>
</div>

CSS：

#navi {
    height: auto;
    width: auto;
}
#navi ul {
    margin: 0px;
    padding: 0px;
    list-style-type: none;
}
#navi ul li {
    float: left;
    position: relative;
}
#navi ul li a {
    line-height: 30px;
    text-decoration: none;
    text-align: center;
    display: block;
    width: 100px;
    height: 30px;
    border: thin solid #999;
    color: #FFF;
    background-color: #0CF;
    -webkit-transition: all 1s;
    -moz-transition: all 1s;
    -ms-transition: all 1s;
    -o-transition: all 1s;
    transition: all 1s;
}
#navi ul li a:hover {
    background-color: #0C3;
}
#navi ul li ul {
    position: absolute;
    -webkit-transition: height 1s linear 0s;
    -moz-transition: height 1s linear 0s;
    -ms-transition: height 1s linear 0s;
    -o-transition: height 1s linear 0s;
    transition: height 1s linear 0s;
    height: 0px;
    overflow:hidden;
}
#navi ul li:hover ul {
    height: 100px;
    -webkit-transition: height 1s linear 0s;
    -moz-transition: height 1s linear 0s;
    -ms-transition: height 1s linear 0s;
    -o-transition: height 1s linear 0s;
    transition: height 1s linear 0s;
}

小提琴Here

现在，我希望菜单不是水平的。 它应该是垂直的。 我试图删除float:left; 但是子菜单不会显示。 子菜单应按下下面的所有菜单项。 有什么建议么？ 会很好。

Answer 1

<!DOCTYPE html>
<html>
<head>
<style> 
#navi {
    height: auto;
    width: auto;
}
#navi ul {
    margin: 0px;
    padding: 0px;
    list-style-type: none;
}
#navi ul li {

}

#navi ul li a {
    line-height: 30px;
    text-decoration: none;
    text-align: center;
    display: block;
    width: 100px;
    height: 30px;
    border: thin solid #999;
    color: #FFF;
    background-color: #0CF;
    -webkit-transition: all 1s;
    -moz-transition: all 1s;
    -ms-transition: all 1s;
    -o-transition: all 1s;
    transition: all 1s;
}
#navi ul li a:hover {
    background-color: #0C3;
}
#navi ul li ul {
    position: relative;
    -webkit-transition: height 1s linear 0s;
    -moz-transition: height 1s linear 0s;
    -ms-transition: height 1s linear 0s;
    -o-transition: height 1s linear 0s;
    transition: height 1s linear 0s;
    height: 0px;
    overflow:hidden;
}
#navi ul li:hover ul {
    height: 100px;
    -webkit-transition: height 1s linear 0s;
    -moz-transition: height 1s linear 0s;
    -ms-transition: height 1s linear 0s;
    -o-transition: height 1s linear 0s;
    transition: height 1s linear 0s;
}
</style>
</head>
<body>
<div id="navi">
    <ul>
        <li><a href="#">First</a></li>
        <li class="active"><a href="#">Second</a>
            <ul class="child">
                <li><a href="#">First child</a></li>
            </ul>
        </li>
        <li><a href="#">Third</a></li>
    </ul>
</div>

</body>
</html>

检查一下

Answer 2

如果这样做，它将给您完美的外观，并将您的nav三项功能向下推。 将此高度添加到您的特定班级：

#navi ul li:hover ul {
    height:32px;
}

但是，如果您在其他主nav项目中具有其他子菜单项，并且其中包含不同的项，那么您应该为所有特定元素创建类，并根据它们的高度来指定它们。 看看这个：

#navi ul li:hover .class {
    height:64px; /*for two items in sub menu and like this for other*/ 
}

Answer 3

您的CSS：

#navi {
    height: auto;
    width: auto;
}
#navi ul {
    margin: 0px;
    padding: 0px;
    list-style-type: none;
}
#navi ul li {
    position: relative;
}
#navi ul li a {
    line-height: 30px;
    text-decoration: none;
    text-align: center;
    display: block;
    width: 100px;
    height: 30px;
    border: thin solid #999;
    color: #FFF;
    background-color: #0CF;
    -webkit-transition: all 1s;
    -moz-transition: all 1s;
    -ms-transition: all 1s;
    -o-transition: all 1s;
    transition: all 1s;
}
#navi ul li a:hover {
    background-color: #0C3;
}
#navi ul li ul {
    position:absolute;
    -webkit-transition: height 1s linear 0s;
    -moz-transition: height 1s linear 0s;
    -ms-transition: height 1s linear 0s;
    -o-transition: height 1s linear 0s;
    transition: height 1s linear 0s;
    height: 0px;
    overflow:hidden;
}
#navi ul li:hover ul {
    position:absolute;
    left: 100px;
    top: 0px;
    height:50px;
    -webkit-transition: height 1s linear 0s;
    -moz-transition: height 1s linear 0s;
    -ms-transition: height 1s linear 0s;
    -o-transition: height 1s linear 0s;
    transition: height 1s linear 0s;
}

您的html：

<div id="navi">
    <ul>
        <li><a href="#">First</a></li>
        <li class="active"><a href="#">Second</a>
            <ul class="child">
                <li><a href="#">First child</a></li>
            </ul>
        </li>
        <li><a href="#">Third</a></li>
    </ul>
</div>

复制并粘贴此编码。 它的工作。 我想你想要这样的垂直菜单栏？？？