失去鼠标焦点时如何防止菜单关闭？

Question

我使用在网络上找到的示例构建了一个不错的下拉菜单，但我的经理遇到了菜单有时难以使用的问题，因为如果鼠标从菜单上掉下来它会关闭。我已经阅读了一些关于如何绕过它的示例here，但我的问题是我无法让这些解决方案与我的代码一起使用。

谁能给我一些建议？我的 CSS 代码和一个 html 示例如下：

#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。只需在您的实际代码中将.level-2-menu, .level-3-menu 的border 属性的颜色从red 更改为transparent。唯一的问题是 3 级菜单挡住了前 2 级项目的右下角。

new jsFiddle

---

听起来您需要的是每个菜单周围的某个区域，您可以在其中离开可见菜单但仍保持菜单打开。这里有一些代码来演示这个概念。您应该能够将这个概念应用到您的代码中，并根据自己的喜好设置样式。

jsFiddle

background-color: red 只是为了让额外的悬停区域可见以进行演示。

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;
}