Question

我有一个主菜单栏，它有一个下拉菜单，该菜单有一个子菜单。如何让子下拉菜单显示在第一个下拉菜单中“下拉2”链接的左侧？我还想将子菜单的顶部对齐到“下拉2”链接的顶部。现在它出现在链接的下方和左侧。

HTML：

<img src="#" width="100%" height="100px">

<div class="TopMenuBar">
  <ul>
    <li><a href="#">Side</a></li>
    <li class="dropdown"><a href="#">menu</a>
      <div class="dropdown-menu">
        <ul>
          <li><a href="#">drop down 1</a></li>
          <li class="sub-dropdown"><a href="#">drop down 2</a>
            <div class="sub-dropdown-menu">
              <ul>
                <li><a href="#">sub drop down 1</a></li>
                <li><a href="#">sub drop down 2</a></li>
              </ul>
            </div>
          </li>
          <li><a href="#">drop down 3</a></li>
        </ul>
      </div>
    </li><a href="#">Bar</a></li>
  </ul>
</div>

<div class="SideMenuBar">
  <ul>
    <li><a href="#">Side</a></li>
    <li><a href="#">Menu</a></li>
    <li><a href="#">Bar</a></li>
  </ul>
</div>


<h1>h1 Header</h1>
<main>
  <h2>h2 Header</h2>
  <p>Main paragraph</p>
  <a href="#">Main link</a>
  <ul>
    <li>Main list item</li>
    <li>Main list item</li>
    <li>Main list item</li>
  </ul>
  <h2>h2 Header</h2>
  <p>Main paragraph</p>
  <a href="#">Main link</a>
  <ul>
    <li>Main list item</li>
    <li>Main list item</li>
    <li>Main list item</li>
  </ul>
</main>

CSS：

.TopMenuBar {
  border: none;
  background-color: purple;
  width: 100%;
  margin: 0;
  padding: 0;
}

.TopMenuBar>ul {
  display: flex;
  justify-content: space-between;
  margin: 0;
  padding: 0;
}

.TopMenuBar>ul, .dropdown-menu>ul, .sub-dropdown-menu>ul{
  list-style-type: none;
  margin: 0;
  padding: 0;
}

.TopMenuBar>li {
  display: inline;
}

.TopMenuBar a, .dropdown-menu a, .sub-dropdown-menu a{
  color: white;
  text-decoration: none;
  padding: 20px;
  display: block
}

/* Applys to all links under class TopMenuBar on hover */
.TopMenuBar a:hover {
  background-color: #b14eb1;
  color: black;
}

.dropdown-menu {

}

.dropdown-menu, .sub-dropdown-menu{
  display: none;
  background-color: purple;
  box-shadow: 0 8px 16px 0 rgba(0, 0, 0, 0.2);
  position: absolute;
  z-index: 1;

}

/* Applys to all links under class TopMenuBar */
.dropdown-menu a {
  color: white;
  padding: 12px 16px;
  text-decoration: none;
  display: block;
  text-align: left;
}

.dropdown:hover .dropdown-menu{
  display: block;
}

.sub-dropdown:hover .sub-dropdown-menu{
  display: table;
}



.SideMenuBar {
  background-color: orange;
  margin-left: 20px;
  margin-top: 0;
  display: flex;
  height: 100vh;
  float: left;
}

.SideMenuBar ul {
  padding: 0;
  margin: 0;
  list-style-type: none;
  justify-content: space-between;
  display: flex;
  flex-direction: column;
}

.SideMenuBar li a {
  color: white;
  text-decoration: none;
  padding: 20px;
  display: list-item;
}

.SideMenuBar li a:hover {
  background-color: #fcbf7e;
  color: black;
}

main {
  padding-left: 10px;
  display: table
}

h1 {
  text-align: center;
}

这是codepen

的工作模型

Answer 1

将其添加到样式表的底部。

library(ggplot2)
ggplot() +
  geom_line(aes(x=1:length(Nts), y=Nts, col='Nts')) +
  geom_line(aes(x=1:length(n450), y=n450, col='n450')) +
  geom_line(aes(x=1:length(n05), y=n05, col='n05')) +
  xlab('x')+
  ylab('y')+
  theme_bw()

更多http://codepen.io/hunzaboy/pen/jyRoWB

Answer 2

请参阅此代码示例，它可能会对您有所帮助

<!DOCTYPE html>
<html>
  <head>
    <title>Example</title>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel="stylesheet" href="css/bootstrap.min.css">
    <script src="js/jquery.min.js"></script>
    <script src="js/bootstrap.min.js"></script>
    <style type="text/css">
      .dropdown-submenu {
        position: relative;
      }
      .dropdown-submenu>.dropdown-menu {
        top: 0;
        left: 100%;
        margin-top: -6px;
        margin-left: -1px;
        -webkit-border-radius: 0 6px 6px 6px;
        -moz-border-radius: 0 6px 6px;
        border-radius: 0 6px 6px 6px;
      }
      .dropdown-submenu:hover>.dropdown-menu {
        display: block;
      }

      .dropdown-submenu>a:after {
        display: block;
        content: " ";
        float: right;
        width: 0;
        height: 0;
        border-color: transparent;
        border-style: solid;
        border-width: 5px 0 5px 5px;
        border-left-color: #ccc;
        margin-top: 5px;
        margin-right: -10px;
      }
      .dropdown-submenu:hover>a:after {
        border-left-color: #fff;
      }
      .dropdown-submenu.pull-left {
        float: none;
      }

      .dropdown-submenu.pull-left>.dropdown-menu {
        left: -100%;
        margin-left: 10px;
        -webkit-border-radius: 6px 0 6px 6px;
        -moz-border-radius: 6px 0 6px 6px;
        border-radius: 6px 0 6px 6px;
      }
    </style>
  </head>
  <body>
     <div class="container">
     <br>
        <div class="row">
          <div class="dropdown">
            <a id="dLabel" role="button" data-toggle="dropdown" class="btn btn-primary" data-target="#" href="/page.html">
                Dropdown <span class="caret"></span>
            </a>
            <ul class="dropdown-menu multi-level" role="menu" aria-labelledby="dropdownMenu">
              <li><a href="#">Some action</a></li>
              <li><a href="#">Some other action</a></li>
              <li class="divider"></li>
              <li class="dropdown-submenu">
                <a tabindex="-1" href="#">Hover me for more options</a>
                <ul class="dropdown-menu">
                  <li><a tabindex="-1" href="#">Second level</a></li>
                  <li class="dropdown-submenu">
                    <a href="#">Even More..</a>
                    <ul class="dropdown-menu">
                      <li><a href="#">3rd level</a></li>
                      <li><a href="#">3rd level</a></li>
                    </ul>
                  </li>
                  <li><a href="#">Second level</a></li>
                  <li><a href="#">Second level</a></li>
                </ul>
              </li>
            </ul>
          </div>
        </div>
      </div>
    </body>
  </html>

如何在下拉菜单的侧面显示子菜单

2 个答案: