The failure of two tags to operate as dropdowns when a div tag is placed between them

 <body>
   <div class = "CentralHeader">
      <div class = "LinkBar" id = "HeaderBar" >All</div>   
      <div class = "SampleMenu">
        <ul>
           <li><a href = "#Movies">Movies</a></li>
           <li><a href = "#Events">Events</a></li>
           <li><a href = "#Sports">Sports</a></li>
           <li><a href = "#Plays">Plays</a></li>        
        </ul>
   </div>

</div>


<style type="text/css">
.LinkBar {
  cursor: pointer;
  width: 140px;
  height: 37px;
  border: 1px solid #c02c3a;
  margin-top: 50px;
  margin-left: 300px;
  background-color: #c02c3a;
  text-align: center;
  padding-top: 9px;
  color: white;
 }

div.SampleMenu ul {
  list-style-type: none;
  width: 140px;
  background-color: Grey;
  margin-left: 300.5px;
  padding: 0;
  margin-top:0px;
  display: none;
  border-top: 2px solid #fff;
}

 div.SampleMenu ul li {
   padding: 0;
  }

 div.SampleMenu ul li a {
  color: white;
  display: block;
  padding: 10px;
  font-size: large;
  text-align: center;
  text-decoration: none;
 }

 #HeaderBar:hover+.SampleMenu ul,
 .SampleMenu ul:hover {
   display: block;
  }
 </style>
 </body>

Why does the dropdown functionality in the code disappear when the search bar div is removed? The issue seems to be related to the display setting of the ul inside the SampleMenu div. When set to auto, the dropdown works fine. What could be causing this disruption in the flow?

htmlcssdisplay

Answer №1

To activate the dropdown, use this code:

#HeaderBar:hover+.SampleMenu ul,
 .SampleMenu ul:hover {
   display: block;
  }

Take note of the adjacent sibling selector: +

According to MDN:

The adjacent sibling combinator (+) separates two selectors and matches the second element only if it immediately follows the first element, and both are children of the same parent element.

Once you add 

<div class = "searchBar">Search</div>
, it becomes the adjacent sibling, causing .SampleMenul ul not to be targeted anymore.

If you wish to retain the markup, consider using the general sibling combinator instead.

For instance...

.LinkBar {
  cursor: pointer;
  width: 140px;
  height: 37px;
  border: 1px solid #c02c3a;
  margin-top: 50px;
  margin-left: 300px;
  background-color: #c02c3a;
  text-align: center;
  padding-top: 9px;
  color: white;
}

div.SampleMenu ul {
  list-style-type: none;
  width: 140px;
  background-color: Grey;
  margin-left: 300.5px;
  padding: 0;
  margin-top: 0px;
  display: none;
  border-top: 2px solid #fff;
}

div.SampleMenu ul li {
  padding: 0;
}

div.SampleMenu ul li a {
  color: white;
  display: block;
  padding: 10px;
  font-size: large;
  text-align: center;
  text-decoration: none;
}

#HeaderBar:hover~.SampleMenu ul,
.SampleMenu ul:hover {
  display: block;
<body>
  <div class="CentralHeader">
    <div class="LinkBar" id="HeaderBar">All</div>
    <div class="searchBar">Search</div>
    <div class="SampleMenu">
      <ul>
        <li><a href="#Movies">Movies</a></li>
        <li><a href="#Events">Events</a></li>
        <li><a href="#Sports">Sports</a></li>
        <li><a href="#Plays">Plays</a></li>
      </ul>
    </div>

  </div>

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