将CSS下拉菜单的最后一个子菜单右对齐 [英] Right-align last submenu of a css drop-down menu

问题描述

希望此CSS下拉菜单的最后一个子菜单右对齐: https://jsfiddle.net/mishka00/p6cyy5p7/.它当前右对齐(不正确)只是为了显示所需的最终结果.尝试了 right:0 和 left:auto 的各种组合，但无法弄清楚.

Would like the last submenu of this css drop-down menu to be right-aligned: https://jsfiddle.net/mishka00/p6cyy5p7/. It is currently right-aligned (incorrectly) just to show the desired end result. Tried various combinations of right:0 and left:auto, but couldn't figure it out.

推荐答案

1. 为 #nav ul li

为 #nav ul li:last-child ul

#nav ul {
    padding:0;
    margin:0;
    list-style:none;
}
#nav ul li {
    float:left;
    border:1px solid #fff;
    margin:0 30px;
    position: relative;
}
#nav ul li a {
    display:block;
    padding:10px 6px;
    position:relative;
}
#nav ul li:hover {
    border-left:1px solid #E9E9E9;
    border-right:1px solid #E9E9E9;
    border-top:1px solid #E9E9E9;
}
#nav ul li ul {
    display:none;
}
#nav ul li:hover ul {
    display:block;
    position:absolute;
    z-index: 10;
    background:#fff;
    width:150px;
    border:0;
}
#nav ul li ul li {
    display:block;
    position:relative;
    border:none;
    float:none;
    margin:0;
    left:-1px;
}
#nav ul li ul li:hover {
    border:none;
    background:#F7F9FB;
}
#nav ul li ul li a {
    padding:10px;
    border:1px solid #E9E9E9;
}
#nav ul li:last-child ul {    
    right: 0;
    background:white;
}
#nav ul li:last-child ul li{
    left:1px;
}

<div id="nav">
    <ul>
        <li><a href="#">Menu1</a>

            <ul>
                <li><a href="menu.html">Item1</a>
                </li>
                <li><a href="menu.html">Item2</a>
                </li>
                <li><a href="menu.html">Item3</a>
                </li>
                <li><a href="menu.html">Item4</a>
                </li>
            </ul>
        </li>
        <li><a href="#">Menu2</a>

            <ul>
                <li><a href="menu.html">Item1</a>
                </li>
                <li><a href="menu.html">Item2</a>
                </li>
                <li><a href="menu.html">Item3</a>
                </li>
                <li><a href="menu.html">Item4</a>
                </li>
            </ul>
        </li>
        <li><a href="#">Menu3</a>

            <ul>
                <li><a href="menu.html">Item1</a>
                </li>
                <li><a href="menu.html">Item2</a>
                </li>
                <li><a href="menu.html">Item3</a>
                </li>
                <li><a href="menu.html">Item4</a>
                </li>
            </ul>
        </li>
    </ul>
</div>
<div style='clear: both;margin-bottom:5px;'></div>
<div style='border-top:1px solid navy;'></div>

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