html - 将鼠标移动到子菜单时，如何在父导航元素上保持悬停状态？

Question

我正在尝试在主菜单元素和子菜单元素之间添加一些间距。

   .dropdown-menu{
        margin-top:10px;
    }

在添加子菜单放置在我想要的位置但将鼠标悬停在“Harry Potter Books”上然后尝试将鼠标从那里移动到子菜单后，子菜单消失了。

我希望能够将鼠标悬停在主菜单项上，并能够将鼠标悬停在子菜单上。

请参阅此代码笔，我正在使用 Bootstrap 来实现基本菜单样式。

https://codepen.io/anon/pen/ErVEZj?editors=11000#0

如果我可以提供任何其他信息，请告诉我。

Answer 1

你应该让 .navbar-nav>li>a(你悬停的东西)占据导航栏的整个高度，因为你想要导航栏下方的下拉菜单。

要使用您的代码轻松完成此操作，只需将 .navbar-nav 的顶部和底部边距移动 10px 到 .navbar-nav>li>a 的顶部和底部填充。然后，您可以从下拉菜单中删除 margin-top: 10px 以创建防悬停间隙。

/*Navbar styles*/

.nav-element {
  color: white;
}

.navbar-nav {
  margin-left: 20px !important;
  margin-top: 0 !important;
  margin-bottom: 0 !important;
}

.navbar-nav>li>a {
  padding-right: 20px !important;
  padding-left: 20px !important;
  padding-top: 15px !important;
  padding-bottom: 15px !important;
  color: white !important;
  transition: all 0.5s ease;
}

#nav:hover>#nav-details {
  display: block;
  background-color: lightgrey;
}


/*Divider style for sub-menu */

.divider {
  height: 1px;
  margin: 9px 20px;
  overflow: hidden;
  background-color: #e5e5e5;
}

.dropdown-menu {}

.navbar-nav>li {
  margin-top: 5px;
}


/*these css blocks contain style for the arrow on the sub-menu*/

.dropdown-menu:after,
.dropdown-menu:before {
  bottom: 100%;
  left: 80px;
  border: solid transparent;
  content: " ";
  height: 0;
  width: 0;
  position: absolute;
  pointer-events: none;
  margin-top: 10px;
}

.dropdown-menu:after {
  border-color: rgba(211, 211, 211, 0);
  border-bottom-color: #D3D3D3;
  border-width: 10px;
  margin-left: -10px;
  margin-top: 10px;
}

.dropdown-menu:before {
  border-color: rgba(0, 0, 0, 0);
  border-bottom-color: #;
  border-width: 13px;
  margin-left: -13px;
  margin-top: 10px;
}


/*styles for list elements and hover logic */

li {
  color: #fff;
  display: block;
  float: left;
  position: relative;
  text-decoration: none;
  transition-duration: 0.5s;
}

li span a {
  color: #fff;
}

li:hover>a:after {
  background: orangered;
}

ul li ul {
  visibility: hidden;
  opacity: 0;
  position: absolute;
  transition: all 0.5s ease;
  left: 0;
  display: none;
}

ul li:hover>ul,
ul li>ul,
ul li ul:hover {
  visibility: visible;
  opacity: 1;
  display: block;
}

ul li:hover>ul,

/*maintain hover state of parent list in sub menus*/

ul li:focus-within>ul,
ul li ul:hover {
  visibility: visible;
  opacity: 1;
  display: block;
}

ul li ul li {
  clear: both;
  width: 100%;
}

<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet"/>
<nav id="myNavbar" class="navbar navbar-default" role="navigation" style="background-color:royalblue;">
  <div class="container">
    <div class="navbar-collapse" id="navbarCollapse" style="background-color:royalblue;">
      <ul class="nav navbar-nav">
        <li id="nav" class="nav-element" aria-haspopup="true">
          <a>Harry Potter Books</a>
          <ul id="nav-details" aria-label="submenu" class="dropdown-menu sub-menu">
            <li><a href="#">Sorcerer's Stone</a></li>
            <li class="divider"></li>
            <li><a href="#">Chamber of Secrets</a></li>
            <li class="divider"></li>
            <li><a href="#">Deathly Hallows</a></li>
            <li class="divider"></li>
            <li><a href="#">Goblet of Fire</a></li>
          </ul>
        </li>
        <li class="nav-element" id="ltc-program-nav">
          <a>Books Better than Harry Potter</a>
        </li>
        <li class="nav-element" id="ApplyNowTopLevel">
          <a>Another Funny Link</a>
        </li>

      </ul>
    </div>
  </div>
</nav>