如何使用CSS创建垂直导航栏的子菜单

Question

如何使用CSS创建垂直导航栏的子菜单

6

我已经搜索了很久，想知道如何为我的网站垂直导航页面创建子菜单。

我希望使用简单的CSS。

我有一个nav.jsp页面，其中包含所有导航链接。以下是相应的代码：

    <table width="220" cellspacing="0" cellpadding="0" height="100%">
    <tr>
        <td bgcolor="#D8D8D8" valign="top">
        <ul id="nav">
        <li><a href="home.jsp">&nbsp;&nbsp;Home</a>
        </li>
        <li><a href="addCompanyDetails.jsp">&nbsp;&nbsp;Add Company Details</a>     
                    </li>
        <li><a href="modifyCompanyDetails.action">&nbsp;&nbsp;Modify Company Details</a>
            <ul id = "subMenu">
            <li>Sub Menu 1
            </li>
            <li>Sub Menu 2
            </li>
            <li>Sub Menu 3
            </li>
            <li>Sub Menu 4
            </li>
            </ul>
        </li>
        <li><a href="deleteCompanyDetails.action">&nbsp;&nbsp;Delete Company Details</a>
        </li>
        <li><a href="search.jsp">&nbsp;&nbsp;Search</a>
        </li>
        <li><a href="viewAllDetails.action">&nbsp;&nbsp;View All Details</a>
        </li>
        </ul>
                </td>
        </tr>
    </table>

我已经编写了父链接的css代码。下面是相应的CSS代码：

    #nav {
padding: 0;
margin: 0;
width: 220px;
padding: 0px;
border: 0px;
margin: 0px;
    }

    #nav li {
width: 100%;
display: block;
float: left;
height: 35px;
border-bottom: 1px solid #ffffff;
    }

    #nav li a {
width: 100%;
display: block;
float: left;
height: 35px;
line-height: 35px;
text-decoration: none;
color: #000000;
    }

    #nav li a:hover {
width: 100%;
display: block;
float: left;
height: 35px;
line-height: 35px;
background-color: #404040;
color: #ffffff;
    }

没有 CSS 代码可以显示子菜单。我只有用于显示父菜单的 CSS 代码。当鼠标悬停在父菜单上时，应该出现子菜单。

请帮忙解决。如果有任何问题，请回信告知。

- Ajinkya Mahagaonkar

1

http://phrogz.net/css/WhyTablesAreBadForLayout.html - Gregoire

5个回答

网页内容由stack overflow 提供, 点击上面的

可以查看英文原文，
原文链接

- Jamie Kudla · Answer 1

您可以使用嵌套列表和绝对定位来实现此目的：

nav {
  display: inline-block;
}

.submenu {
  display: none;
  position: absolute;
  left: 100%;
  top: 0;
}

.menu > li {
  position: relative;
}

.menu li:hover .submenu {
  display: block;
}

这是一个有点儿乱的例子 http://codepen.io/JKudla/pen/mWGwqp?editors=1100

- Amit Narayan · Answer 2

您可以使用以下代码：

#nav #subMenu{ display:none; }

#nav li:hover #subMenu { display: block; position:absolute; left:228px; background:#D8D8D8; padding:0; }

- Kuzgun · Answer 3

#submenu{
display:none;
}

#nav li:hover > ul{
display:block;
}

我建议在子菜单中使用类(class)而不是ID(id)，因为您可能需要多个。

- user3286306 · Answer 4

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>Sample </title>
<!--<link rel="stylesheet" href="Style.css" type="text/css" >-->
<style type="text/css" media="screen">
#horizontalmenu ul {
padding:1; 
margin:2; 
list-style:none;
}
#horizontalmenu li {
float:left; 
position:relative; 
padding-right:60; 
display:block;
border:2px solid #FF0000;
border-style:outset;
}
#horizontalmenu li ul {
    display:none;
position:absolute;
}
#horizontalmenu li:hover ul{
    display:block;
    background:#F9F2FF;
    height:auto; width:14em;
}
#horizontalmenu li ul li{
clear:both;
border-style:none;
}
</style>


</head>

<body>
<table cellpadding="0" cellspacing="0" width="100%" height="100%" border="0">
  <tr>
    <td valign="top">
    <form id="cse-search-box" action="home.html">
    <table width="100%" height="100%" border="0" bgcolor="#FDFEFF">
  <tr>
    <td height="120" width="190">&nbsp;</td>
    <td height="120" width="190"><!--<img src="Images/Laptop2.jpg" height="120" width="190" />--></td>
    <td height="120" width="190" align="center">&nbsp;</td>
    <td height="120" width="180"><table width="180" height="120" border="0">
      <tr>
        <td><font color="#663333"> Call our LapTop Expert</font></td>
      </tr>
      <tr>
        <td ><font color="#666633"> +919855566689</font></td>
      </tr>
      <tr>
        <td>&nbsp;</td>
      </tr>
    </table></td>
    <td height="120" width="210">&nbsp;</td>
  </tr>
  <tr>
    <td colspan="4" >
    <div id="horizontalmenu">
        <ul> <li><a href="sample.html">Home</a></li>
    <li><a href="#">Battery</a>
        <ul><li><a href="Batterysample.html">HP Laptop Battery</a></li> 
        <li><a href="SonyBattery.html">Sony Laptop Battery</a></li> 
        <li><a href="DellBattery.html">Dell Laptop Battery</a></li> 
        <li><a href="LenovoBattery.html">Lenovo Laptop Battery</a></li></ul></li>
    <li><a href="#">Adapter</a>
        <ul> <li><a href="HP Battery.html">HP Laptop Adapter</a></li> 
        <li><a href="#">Sony Laptop Adapter</a></li> 
        <li><a href="#">Dell Laptop Adapter</a></li> 
        <li><a href="#">Lenovo Laptop Adapter</a></li>
        <li><a href="#">Toshiba Laptop Adapter</a></li></ul></li>
    <li><a href="#">Laptop Care</a>
        <ul> <li><a href="Battery care.html">Battery Care Practices</a></li></ul></li>
    <li><a href="#">Service Status</a></li>

    </ul>
</div>  </td>
    <td align="right">
      <input type="text"  placeholder="Search"  />
     &nbsp;</td>
    </tr>
  <tr>
    <td>&nbsp;</td>
    <td>&nbsp;</td>
    <td>&nbsp;</td>
    <td>&nbsp;</td>
    <td align="right">
    <input type="submit" name="sa" value="Search" />&nbsp;&nbsp;</td>
  </tr>
    <tr>
    <td colspan="5" height="70" bgcolor="#F0F0F0" valign="bottom"><font face="Agency FB" size="+4" color="#FFA8A8">Dell Laptop Battery </font></td>
   </tr>
   <tr>
    <td colspan="5"bgcolor="#FFA6A6"></td>
   </tr>

   <!--<tr>
    <td colspan="5" height="30"><font face="Agency FB" size="+2" color="#AAAAFF">Display&nbsp;</font>
    <select><option value="5">5</option>
    <option value="10" selected="selected">10</option>
    <option value="15">15</option>
    <option value="20">20</option>
    <option value="25">25</option>
    <option value="30">30</option>
    <option value="50">50</option>
    <option value="100">100</option>
    <option value="0">All</option>
</select>
     </td>
    </tr>-->
  <tr>
    <td colspan="5">
    <p><font face="Agency FB" size="+2" color="#FF0000">Dell 14r Battery </font></p>
    <p><font face="Agency FB" size="+2" color="#FF0000">Dell Inspiron 1464 Battery  </font></p>
    <p><font face="Agency FB" size="+2" color="#FF0000">Dell Inspiron 1525 Battery </font></p>
    <p><font face="Agency FB" size="+2" color="#FF0000">Dell Inspiron M5010 9 cell Battery</font></p>
    <p><font face="Agency FB" size="+2" color="#FF0000">Dell Inspiron N5010 Battery</font></p>
    <p><font face="Agency FB" size="+2" color="#FF0000">Dell Latitude E5500 Battery </font></p>
    <p><font face="Agency FB" size="+2" color="#FF0000">Dell Vostro 1500 Battery</font></p>
    <p><font face="Agency FB" size="+2" color="#FF0000">Dell Vostro 1510/1520/1310 Battery </font></p>

    </td>
    </tr>

    <tr>
    <td colspan="5" height="30">&nbsp; </td>
    </tr>

  <tr>
    <td colspan="5" height="200">&nbsp;</td>
    </tr>
    <tr>
    <td colspan="5" bgcolor="#663300"></td>
    </tr>
</table>
      </form>
    </td>
    <tr bgcolor="#F4EAEA">
    <td>
      <table width="100%" border="0">
        <tr>
          <td width="250"><font face="Agency FB" color="#FF0000" size="5">Company Info</font></td>
          <td width="250"><font face="Agency FB" color="#FF0000" size="5">Terms & Conditions</font></td>
          <td width="250"><font face="Agency FB" color="#FF0000" size="5"></font></td>
          <td width="250"><font face="Agency FB" color="#FF0000" size="5">Bangalore</font></td>
        </tr>
        <tr>
        <td bgcolor="#FCF8F8"></td>
        <td bgcolor="#FCF8F8"></td>
        <td bgcolor="#FCF8F8"></td>
        <td bgcolor="#FCF8F8"></td>
        </tr>
        <tr>
          <td width="250"><a href="About.html"><font face="Times New Roman, Times, serif" color="#333300">About Us </font></a></td>
          <td width="250"><font face="Times New Roman, Times, serif" color="#333300">Privacy Policy </font></td>
          <td width="250" rowspan="5">&nbsp;</td>
          <td width="250" rowspan="5" valign="top">&nbsp;</td>
        </tr>
        <tr>
          <td width="250"><a href="Contact.html"><font face="Times New Roman, Times, serif" color="#333300">Enter Details To Get Service </font></a></td>
          <td width="250"><font face="Times New Roman, Times, serif" color="#333300">Collection Centers </font></td>
        </tr>
        <tr>
          <td width="250"><a href="Service Expertise.html"><font face="Times New Roman, Times, serif" color="#333300">Service Expertise </font></a></td>
          <td width="250"><font face="Times New Roman, Times, serif" color="#333300">Services</font></td>
        </tr>
        <tr>
          <td width="250"><font face="Times New Roman, Times, serif" color="#333300">Customer Reviews </font></td>
          <td width="250">&nbsp;</td>
         </tr>
          <tr>
          <td width="250">&nbsp;</td>
          <td width="250">&nbsp;</td>
         </tr>
         <tr>
         <td colspan="4">&nbsp;</td>
         </tr>
         <tr>
        <td colspan="4" bgcolor="#FF9393"></td>
        </tr>

      </table></td>
      </tr>

  </tr>
</table>
</body>
</html>

- vascomotaborges · Answer 5

这应该适用于您的情况。

#nav #subMenu{
    display:none;
}

#nav li:hover #subMenu {
    display: block;
}

虽然应该使用类（classes）而非 ID。还要记住，IE6 中 :hover 仅适用于链接。