html - 下拉菜单不显示子菜单

Question

这是我的下拉按钮的代码，其中包含 1 个附加级别。

当我点击按钮时，它工作正常，但是当我尝试在子菜单的下拉菜单中点击时，我意识到出了点问题，我的所有四个元素只显示最后一个子菜单。

.icon-cadet-left {
  float: right;
}
.dropbtn {
  width: 300px;
  background-color: #4CAF50;
  color: white;
  padding: 16px;
  font-family: 'Play';
  font-size: 20px;
  border: none;
  cursor: pointer;
  text-transform: uppercase;
  letter-spacing: 2px;
}
.dropdown {
  position: relative;
  display: inline-block;
}
.dropdown-content {
  display: none;
  position: relative;
  background-color: #f9f9f9;
  min-width: 160px;
  box-shadow: 0px 8px 16px 0px rgba(0, 0, 0, 0.2);
}
.dropdown-content a {
  width: 300px;
  color: black;
  font-family: 'Play';
  letter-spacing: 2px;
  padding: 12px 16px;
  text-decoration: none !important;
  display: block;
  text-align: center;
  border-bottom: 0.1em solid #e1e1e1;
  border-radius: 5%;
  text-transform: uppercase;
  overflow: hidden;
}
#dropdown-submenu {
  display: none;
  background-color: #f9f9f9;
  position: absolute;
  box-shadow: 0px 8px 16px 0px rgba(0, 0, 0, 0.2);
  left: 100%;
  top: 0px;
}
#dropdown-submenu a {
  z-index: 1000;
  width: 300px;
  color: black;
  font-family: 'Play';
  letter-spacing: 2px;
  padding: 12px 16px;
  text-decoration: none !important;
  display: block;
  text-align: center;
  border-bottom: 0.1em solid #e1e1e1;
  border-radius: 5%;
  text-transform: uppercase;
}
.dropdown-content a:hover {
  background-color: #f1f1f1
}
#dropdown-submenu a:hover {
  background-color: #f1f1f1
}
.dropdown:hover .dropdown-content {
  display: block;
}
.dropdown-content:hover #dropdown-submenu {
  display: block;
}
.dropdown:hover .dropbtn {
  background-color: #3e8e41;
}

<div class="pricing-button">
  <div class="dropdown">
    <button class="dropbtn">Logo Design</button>
    <div class="dropdown-content animated fadeIn">
      <a class="span1" href="#">Logo & Identity<i class="fa fa-caret-right icon-cadet-left"></i></a>
      <div id="dropdown-submenu">
        <a>Logo Design</a>
        <a>Business Cards</a>
        <a>Sationary</a>
        <a>Holiday Doodles</a>
      </div>
      <a class="hover2" href="#">Business & Advertising<i class="fa fa-caret-right icon-cadet-left"></i></a>
      <div id="dropdown-submenu">
        <a>Sample 01</a>
        <a>Sample 02</a>
        <a>Sample 03</a>
        <a>Sample 04</a>
      </div>
      <a class="hover3" href="#">Website & Digitals<i class="fa fa-caret-right icon-cadet-left"></i></a>
      <div id="dropdown-submenu">
        <a>Sample 01</a>
        <a>Sample 02</a>
        <a>Sample 03</a>
        <a>Sample 04</a>
      </div>
      <a class="hover4" href="#">Textile Designing<i class="fa fa-caret-right icon-cadet-left"></i></a>
      <div id="dropdown-submenu">
        <a>Sample 01</a>
        <a>Sample 02</a>
        <a>Sample 03</a>
        <a>Sample 04</a>
      </div>
    </div>
  </div>
</div>

Answer 1

这就是我在您的代码中所做的更改:

1. 您的语法无效 - 您不能有多个 id - 为此请使用 class。

   所以我将 dropdown-submenu 更改为 class。

2. 而不是 .dropdown-content:hover #dropdown-submenu 使用这个:

   .dropdown-content a:hover + .dropdown-submenu {
       display: block;
   }
   

   相邻的兄弟选择器 (+) 选择紧跟在菜单 a 标记之后的 dropdown-submenu。

Adjacent sibling selector (+) that selects the sibling element that immediately follows. See here and here for examples.

让我知道您对此的反馈。谢谢!

.icon-cadet-left {
  float: right;
}
.dropbtn {
  width: 300px;
  background-color: #4CAF50;
  color: white;
  padding: 16px;
  font-family: 'Play';
  font-size: 20px;
  border: none;
  cursor: pointer;
  text-transform: uppercase;
  letter-spacing: 2px;
}
.dropdown {
  position: relative;
  display: inline-block;
}
.dropdown-content {
  display: none;
  position: relative;
  background-color: #f9f9f9;
  min-width: 160px;
  box-shadow: 0px 8px 16px 0px rgba(0, 0, 0, 0.2);
}
.dropdown-content a {
  width: 300px;
  color: black;
  font-family: 'Play';
  letter-spacing: 2px;
  padding: 12px 16px;
  text-decoration: none !important;
  display: block;
  text-align: center;
  border-bottom: 0.1em solid #e1e1e1;
  border-radius: 5%;
  text-transform: uppercase;
  overflow: hidden;
}
.dropdown-submenu {
  display: none;
  background-color: #f9f9f9;
  position: absolute;
  box-shadow: 0px 8px 16px 0px rgba(0, 0, 0, 0.2);
  left: 100%;
  top: 0px;
}
.dropdown-submenu a {
  z-index: 1000;
  width: 300px;
  color: black;
  font-family: 'Play';
  letter-spacing: 2px;
  padding: 12px 16px;
  text-decoration: none !important;
  display: block;
  text-align: center;
  border-bottom: 0.1em solid #e1e1e1;
  border-radius: 5%;
  text-transform: uppercase;
}
.dropdown-content a:hover {
  background-color: #f1f1f1
}
.dropdown-submenu a:hover {
  background-color: #f1f1f1
}
.dropdown:hover .dropdown-content {
  display: block;
}
.dropdown-content a:hover + .dropdown-submenu {
  display: block;
}
.dropdown:hover .dropbtn {
  background-color: #3e8e41;
}

<div class="pricing-button">
  <div class="dropdown">
    <button class="dropbtn">Logo Design</button>
    <div class="dropdown-content animated fadeIn">
      <a class="span1" href="#">Logo & Identity<i class="fa fa-caret-right icon-cadet-left"></i></a>
      <div class="dropdown-submenu">
        <a>Logo Design</a>
        <a>Business Cards</a>
        <a>Sationary</a>
        <a>Holiday Doodles</a>
      </div>
      <a class="hover2" href="#">Business & Advertising<i class="fa fa-caret-right icon-cadet-left"></i></a>
      <div class="dropdown-submenu">
        <a>Sample 01</a>
        <a>Sample 02</a>
        <a>Sample 03</a>
        <a>Sample 04</a>
      </div>
      <a class="hover3" href="#">Website & Digitals<i class="fa fa-caret-right icon-cadet-left"></i></a>
      <div class="dropdown-submenu">
        <a>Sample 01</a>
        <a>Sample 02</a>
        <a>Sample 03</a>
        <a>Sample 04</a>
      </div>
      <a class="hover4" href="#">Textile Designing<i class="fa fa-caret-right icon-cadet-left"></i></a>
      <div class="dropdown-submenu">
        <a>Sample 01</a>
        <a>Sample 02</a>
        <a>Sample 03</a>
        <a>Sample 04</a>
      </div>
    </div>
  </div>
</div>