如何格式化多级下拉菜单

Question

我想在网页上使用以下下拉菜单：

HTML：

<div id="mn-wrapper">
    <div class="mn-sidebar">
        <div class="mn-toggle"><i class="fa fa-bars"></i></div>
        <div class="mn-navblock">
            <ul class="mn-vnavigation">
                <li class="dropdown-submenu active">
                    <a tabindex="-1" href="#">Client Advice</a>
            <ul class="dropdown-menu">
                <li><a tabindex="-1" href="#">Pre-advice</a></li>
              <li><a href="#">Strategy & Technical</a></li>
              <li><a href="#">Research</a></li>
              <li class="dropdown-submenu active">
                <a href="#">APL & Products</a>
                <ul class="dropdown-menu parent">
                    <li style=" border-bottom: 1px solid #ccc;">
                                        <a href="#">Approved Product List
                                            <span aria-hidden="true" class="glyphicon glyphicon-plus pull-right"></span>
                                            <span aria-hidden="true" class="glyphicon glyphicon-minus pull-right" style="display:none;"></span>
                                        </a>
                                    <ul class="child">
                                        <li style="padding:10px 15px; color:white;">Platforms</li>
                    <li style="padding: 10px 15px; color:white;">Managed Funds</li>
                    <li style="padding: 10px 15px; color:white;">Wealth Protection</li>
                    <li style="padding: 10px 15px; color:white;">Listed Securities</li>
                    <li style="padding: 10px 15px; color:white;">Wealth Protection</li>
                    <li style="padding: 10px 15px; color:white;">Listed Securities</li>
                    <li style="padding: 10px 15px; color:white;">Listed Securities</li>
                  </ul>
                                </li>
                <li style=" border-bottom: 1px solid #ccc;"><a href="#">Model Portfolios</a></li>
                <li style=" border-bottom: 1px solid #ccc;"><a href="#">Non-approved Products</a></li>
             </ul>
           </li>
           <li><a href="#">Implementation</a></li>
           <li><a href="#">Review</a></li>
           <li><a href="#">Execution Only</a></li>
         </ul>
       </li>
       <li><a href="#">Personal Development</a></li>
       <li><a href="#">Practice</a></li>
       <li><a href="#">News</a></li>
     </ul>
   </div>
   <div class="bottom-mn">
         <ul class="mn-vnavigation">
                <li>
                    <a href="#">My Favourite</a>
             </li>
             <li>
                    <a href="#">Most Popular</a>
             </li>
         </ul>
   </div>
</div>
<div class="container" id="mn-cont">
    <div class="cnt-mcont">
        <h1>Title Page</h1>
    </div>
</div>
</div>

CSS：

html{
    height:100%; 
}
body{
    height:50%;
    position: relative;
}
.dropdown-submenu {
    border-bottom: 1px solid #ccc;
}
#mn-wrapper {
  display: table;
  width: 100%;
  position: absolute;
    height: 100%;
}
.mn-sidebar {
  display: table-cell;
  position: relative;
  vertical-align: top;
  padding-bottom: 49px;
    background: #272930;
    width: 216px;
    z-index: 2;
}
#mn-cont {
  display: table-cell;
    vertical-align: top;     
    position: relative;
    padding: 0;
}
.container {
    margin-right: auto;
}
.cnt-mcont {
  background-color: #F6F6F6;
  color: inherit;
  font-size: 13px;
  font-weight: 200;
  line-height: 21px;
  padding: 15px 30px 30px 30px;
  margin-top: 0;
    height: 101vh;
}
.mn-sidebar .mn-toggle {
  display: none;
  padding: 10px 0;
  text-align: center;
    cursor: pointer;
}
.mn-vnavigation {
  margin: 0 0 0 0;
  padding: 0;
  border-top: 1px solid #1a1c20;
    border-bottom: 1px solid #2f323a;
}
.mn-vnavigation li a {
  border-top: 1px solid #32353e;
  border-bottom: 1px solid #1a1c20;
  display: block;
  padding: 14px 18px 13px 15px;
  color: #fff;
  text-decoration: none;
  font-size: 12px;
  font-weight: 300;
  text-shadow: 1px 1px 0 rgba(0, 0, 0, 0.3);
    white-space: nowrap;
}
.dropdown-submenu >
.dropdown-menu {
    top: 0;
  left: 100%;
  margin-top: -6px;
  margin-left: -1px;
  height: 101vh;
  width: 216px;
  background: #272930;
}
.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;
}
ul {
    list-style: none;
}
ul.dropdown-menu.parent {
  margin-top: -1px;
}
.bottom-mn {
    bottom:0px;         
    position:absolute;
    width:100%;
}

JS：

$('.child').hide(); //Hide children by default
$('.parent').children().click(function () {
    event.preventDefault();
    $(this).children('.child').slideToggle('slow');
    $(this).find('span').toggle();
});

http://codepen.io/MaGiO/pen/YXXzeJ

但是，当我将鼠标悬停在任何列表项上并打开另一个子列表时，我不希望黑色部分一直延伸到屏幕末端，我希望当我将鼠标悬停在一个列表项上时仅扩展一个新列表直到出现最后一个列表项。 我对此有何改变？

另外，当我尝试在CSS的.mn-侧栏中使用margin-left时，下拉菜单会向右移动，但是项目符号会出现在第一个列表项之前（下拉菜单之外），为什么会这样？ 我希望下拉菜单显示在右侧。

Answer 1

在.dropdown-submenu > .dropdown-menu { css

.dropdown-submenu >
.dropdown-menu {
top: 0;
left: 100%;
margin-top: -6px;
margin-left: -1px;
/* height: 101vh;*/Comment this out
width: 216px;
background: #272930;
}

并请解释一下I want the dropdown menu to appear a bit on the right.含义I want the dropdown menu to appear a bit on the right.

看这个

确定尝试以下代码

.mn-vnavigation li a {
margin-left:15px; Add this style
}

根据您的要求给左边距

看这个