丢失鼠标焦点时如何防止菜单关闭？

Question

我使用我在网络上找到的示例构建了一个很好的下拉菜单但是我的经理遇到了一个问题，菜单有时很难使用，因为如果鼠标从菜单上掉下来就会关闭。我已经阅读了一些关于如何解决它的例子here，但我的问题是我无法使用这些解决方案来处理我的代码。

有人可以给我一些指示吗？我的CSS代码和html示例包含在下面：

#cssmenu ul,
#cssmenu li,
#cssmenu span,
#cssmenu a {
  padding: 0;
  position: relative;
  margin-left:auto;
  margin-right:auto;
  text-align:center;
  font-family: "charles modern"
}
#cssmenu {
  line-height: 1;
  background: #ffffff;
  margin-left:auto;
  margin-right:auto;
  text-align:center;
}
#cssmenu .padding{
  display: block;
  position: absolute;
  z-index: 78;

  width: 100%;
  height: 100%;

  top: 0px;
  left: 0px;
  background: none !important;
}
/* Padding amount for first-level dropdown */
#cssmenu > li > .submenu > .padding{
  width: 400%;
  left: -30%;
  height: 160%;
}

#cssmenu .buffer{
  display: block;
  position: absolute;
  bottom: 0px;
  right: 100%;

  width: 100%;
  height: 100%;
  background: none !important;
}

#cssmenu .shadow{
  display: none !important;
}
#cssmenu:after,
#cssmenu ul:after {
  content: '';
  display: block;
  clear: both;
}
#cssmenu a {
  background: #ffffff;
  color: #00A0DF;
  display: block;
  font-family: "charles modern", "charles modern light", Calibri, sans-serif;
  font-weight: bold;
  padding: 19px 20px;
  text-decoration: none;
  margin-left:auto;
  margin-right:auto;
  text-align:center;
  z-index:99999;

}
#cssmenu ul {
  list-style: none;
}
#cssmenu > ul > li {
  display: inline-block;
  float: center;
  margin:0 auto;
}
#cssmenu.align-center {
  text-align: center;
}
#cssmenu.align-center > ul > li {
  float: none;
}
#cssmenu.align-center ul ul {
  text-align: left;
}
#cssmenu.align-right > ul {
  float: right;
}
#cssmenu.align-right ul ul {
  text-align: right;
}
#cssmenu > ul > li > a {
  color: #ffffff;
  font-size: 12px;
}
#cssmenu > ul > li:hover:after {
  content: '';
  display: block;
  width: 0;
  height: 0;
  position: absolute;
  left: 50%;
  bottom: 0;
  border-left: 10px solid transparent;
  border-right: 10px solid transparent;
  border-bottom: 10px solid #0fa1e0;
  margin-left: -10px;
}
#cssmenu > ul > li:first-child > a {
  border-radius: 5px 0 0 0;
  -moz-border-radius: 5px 0 0 0;
  -webkit-border-radius: 5px 0 0 0;
}
#cssmenu.align-right > ul > li:first-child > a,
#cssmenu.align-center > ul > li:first-child > a {
  border-radius: 0;
  -moz-border-radius: 0;
  -webkit-border-radius: 0;
}
#cssmenu.align-right > ul > li:last-child > a {
  border-radius: 0 5px 0 0;
  -moz-border-radius: 0 5px 0 0;
  -webkit-border-radius: 0 5px 0 0;
}
#cssmenu > ul > li.active > a {
  color: #047aea;
  text-align: center;
  padding: 14px 14px;
  font-size:150%;
  font-style: bold;
  background: #ffffff;
}

#cssmenu > ul > li:hover > a {
  background-color: #00A0DF;
  color: white;
}

#cssmenu .has-sub {
  z-index: 1;
}
#cssmenu .has-sub:hover > ul {
  display: block;
}
#cssmenu .has-sub ul {
  display: none;
  position: absolute;
  width: 250px;
  top: 100%;
  left: 0;
  font-size: 100%;
}
#cssmenu.align-right .has-sub ul {
  left: auto;
  right: 0;
}
#cssmenu .has-sub ul li {
  *margin-bottom: -1px;
}
#cssmenu .has-sub ul li a {
  background: #f2f2f2;
  display: block;
  line-height: 120%;
  padding: 6px 6px;
  color: black;
  font-syle: bold;
  font-size: 105%;
}
#cssmenu .has-sub ul li {
  background: #f2f2f2;
}
#cssmenu .has-sub ul li:hover a {
  background: #00A0DF;
}
#cssmenu ul ul li:hover > a {
  color: #ffffff;
}
#cssmenu .has-sub .has-sub:hover > ul {
  display: block;
}
#cssmenu .has-sub .has-sub ul {
  display: none;
  position: absolute;
  left: 100%;
  top: 0;
  height: 250px;
  overflow: auto;
}
#cssmenu.align-right .has-sub .has-sub ul,
#cssmenu.align-right ul ul ul {
  left: auto;
  right: 100%;
}
#cssmenu .has-sub .has-sub ul li a {
  background: #f2f2f2;
}

#cssmenu .has-sub .has-sub ul li {
  background: #f2f2f2;
}

#cssmenu .has-sub .has-sub ul li a:hover {
  background: #00A0DF;
}
#cssmenu ul ul li.last > a,
#cssmenu ul ul li:last-child > a,
#cssmenu ul ul ul li.last > a,
#cssmenu ul ul ul li:last-child > a,
#cssmenu .has-sub ul li:last-child > a,
#cssmenu .has-sub ul li.last > a {
  border-bottom: 0;
}

<div id='cssmenu'>
  <ul>
    <li class='active has-sub'><center>Image 1</center></a>
  <ul>
    <li class='has-sub'><a href='#'><span>Add New Item</span></a></li>
    <li class='has-sub'><a href='#'><span>View Item</span></a></li>
    <li class='has-sub last'><a href='#'><span>Item With Sub-Items:</span></a>
      <ul>
        <li><a href='#'><span>User 1</span></a></li>
        <li><a href='#'><span>User 2</span></a></li>
      </ul>
    </li>
  </ul>
  <li class='active has-sub'><center>&nbsp;&nbsp;&nbsp;&nbsp;Image 2</center></a>
<ul>
  <li class='has-sub'><a href='#'><span>Add New Item</span></a></li>
  <li class='has-sub'><a href='#'><span>View Item</span></a></li>
</ul>
</li>	
</ul>
</div>

Answer 1

编辑：现在使用涉及边框和容器div的不同（更简单）方法。只需在实际代码中将border .level-2-menu, .level-3-menu属性的颜色从red更改为transparent即可。唯一的问题是3级菜单阻止了前一级2项的右下角。

new jsFiddle

听起来你需要的是每个菜单周围的一些区域，你可以离开可见菜单，但仍然保持菜单打开。这里有一些代码来演示这个概念。您应该能够将概念调整到您的代码中，并根据您的喜好对其进行样式化。

jsFiddle

background-color: red只是为了演示目的而使额外的悬停区域可见。

HTML：

<div class="cssmenu">
  <ul class="level-1-menu">
    <li class="level-1-item">
      <a href="#">Level 1 Item 1</a>
      <ul class="level-2-menu">
        <li class="level-2-item"><a href="#">Level 2 Item 1</a></li>
        <li class="level-2-item"><a href="#">Level 2 Item 2</a></li>
        <li class="level-2-item">
          <a href="#">Level 2 Item 3 with Sub-Items</a>
          <ul class="level-3-menu">
            <li class="level-3-item"><a href="#">Level 3 Item 1</a></li>
            <li class="level-3-item"><a href="#">Level 3 Item 2 longer</a></li>
          </ul>
        </li>
      </ul>
    </li>
    <li class="level-1-item">
      <a href="#">Level 1 Item 2</a>
      <ul class="level-2-menu">
        <li class="level-2-item"><a href="#">Level 2 Item 1</a></li>
        <li class="level-2-item"><a href="#">Level 2 Item 2 longer</a></li>
      </ul>      
    </li>
  </ul>
</div>

CSS：

.cssmenu {
  background-color: white;
}
.cssmenu ul {
  background-color: white;
  list-style: none;
  padding: 0;
}

.cssmenu li {
  padding: 20px 0;
  position: relative;
}

.cssmenu li:hover {
  background-color: lightblue;
}

.cssmenu li a {
  padding: 20px;
}

.level-1-menu {
  text-align: center;
}

.level-1-item {
  display: inline-block;
  text-align: left;
}

.level-2-menu,
.level-3-menu {
  display: none;
  position: absolute;
  white-space: nowrap;
}

.level-1-item:hover .level-2-menu,
.level-2-item:hover .level-3-menu {
  display: block;
}

.level-2-menu {
  left: 0;
  top: 100%;
}

.level-3-menu {
  left: 100%;
  top: 0;
}

.level-2-item {
  position: relative;
}

.level-2-item::after,
.level-3-item::after {
  background-color: red;
  bottom: 0;
  content: '';
  left: -30px;
  position: absolute;
  right: -30px;
  top: 0;
  z-index: -1;
}

.level-2-item:first-child::after,
.level-3-item:first-child::after {
  top: -30px;
}

.level-2-item:last-child::after,
.level-3-item:last-child::after {
  bottom: -30px;
}