如何悬停在孩子身上 <li> 元素

Question

Please look at the code snippet below.

The structure is

<ul>
    <li>text1</li>
    <li> <ul><li> text2 </li>
             <li> text3 </li>
         </ul>
    </li>
</ul>

I have the CSS as follows:

li:hover
{
   background-color: yellow;
}

It works fine for the first li but when I hover over the second item (in the sub-ul), then all items in the sub list are highlighted.

What I need is for a single row to be highlighted at a time, regardless of the relationship of the list item.

I tried

li:child-only:hover

but it did not work. All other answers on SO are approaching jQuery to handle this issue. Can this be solved using only CSS?

 ul { list-style-type: none; } li:hover { color: blue; cursor: pointer; background-color: yellow; } 

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script> <ul> <li>Lv1: First Item</li> <li>Lv1: Second Item</li> <li> <ul> <li>Lv2: First Item</li> <li> <ul> <li>Lv3: First Item</li> <li>Lv3: Second Item</li> <li>Lv3: Third Item</li> </ul> </li> <li>Lv2: Second Item</li> <li>Lv2: Third Item</li> </ul> </li> </ul> 

Answer 1

Just change the styles set for li inside ul as you want them to be:

 ul { list-style-type: none; color: black; cursor: default; background-color: white; } li:hover { color: blue; cursor: pointer; background-color: yellow; } 

 <ul> <li>Lv1: First Item</li> <li>Lv1: Second Item</li> <li> <ul> <li>Lv2: First Item</li> <li> <ul> <li>Lv3: First Item</li> <li>Lv3: Second Item</li> <li>Lv3: Third Item</li> </ul> </li> <li>Lv2: Second Item</li> <li>Lv2: Third Item</li> </ul> </li> </ul> 

Answer 2

You should put the :hover property on an element surrounding the text content of the li , like so:

 ul { list-style-type: none; } li span:hover { color: blue; cursor: pointer; background-color: yellow; } 

 <ul> <li><span>Lv1: First Item</span></li> <li><span>Lv1: Second Item</span></li> <li> <ul> <li><span>Lv2: First Item</span></li> <li> <ul> <li><span>Lv3: First Item</span></li> <li><span>Lv3: Second Item</span></li> <li><span>Lv3: Third Item</span></li> </ul> </li> <li><span>Lv2: Second Item</span></li> <li><span>Lv2: Third Item</span></li> </ul> </li> </ul> 

(or maybe use div s if you want to highlight a full row of content)

Answer 3

 ul { list-style-type: none; } ul li:hover { color: blue; cursor: pointer; background-color: yellow; } ul li:hover ul{ background-color: white; color: black; } 

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script> <ul> <li>Lv1: First Item</li> <li>Lv1: Second Item</li> <li> <ul> <li>Lv2: First Item</li> <li> <ul> <li>Lv3: First Item</li> <li>Lv3: Second Item</li> <li>Lv3: Third Item</li> </ul> </li> <li>Lv2: Second Item</li> <li>Lv2: Third Item</li> </ul> </li> </ul> 

U have to reset for other while hovering.

Answer 4

You can override the background color of sub-ul's with the page background color:

ul > li:hover {
  background: yellow;
}
ul > li:hover > ul {
  background: white;
}

Example: http://jsfiddle.net/xo1g3sub/

Answer 5

I added few aditional classes so you can actually target the elements you want to style. Here you can find more info about > Is there a CSS selector for the first direct child only?

 ul { list-style-type: none; } .first > li:hover { color: blue; cursor: pointer; background-color: yellow; } .first > .nested:hover{ background:none; color:black; } 

 <ul class="first"> <li>Lv1: First Item</li> <li>Lv1: Second Item</li> <li class="nested"> <ul> <li>Lv2: First Item</li> <li> <ul> <li>Lv3: First Item</li> <li>Lv3: Second Item</li> <li>Lv3: Third Item</li> </ul> </li> <li>Lv2: Second Item</li> <li>Lv2: Third Item</li> </ul> </li> </ul> 

Answer 6

If you are looking for a very elegant event driven solution, you should implement below code:

Note: It uses e.stopPropagation() to execute event only on hovered element. And this way you add only 2 event listeners that take care of the entire list. No HTML or CSS modifications are necessary.

$('ul').delegate('li', 'mouseover', function (e) {
    if (e.currentTarget.tagName == 'LI') {
        $(e.currentTarget).css('background-color','yellow');
        e.stopPropagation();
    }
});

$('ul').delegate('li', 'mouseout', function (e) {
    if (e.currentTarget.tagName == 'LI') {
        $(e.currentTarget).css('background-color','');
        e.stopPropagation();
    }
});

Working fiddle: https://jsfiddle.net/urahara/t6fp2un2/

Answer 7

<ul>
  <li>Lv1: First Item</li>
  <li>Lv1: Second Item</li>
  <li>Lv1: Third Item
    <ul>
      <li>Lv2: First Item</li>
      <li>Lv2: Second Item
        <ul>
          <li>Lv3: First Item</li>
          <li>Lv3: Second Item</li>
          <li>Lv3: Third Item</li>
        </ul>
      </li>
      <li>Lv2: Second Item</li>
      <li>Lv2: Third Item</li>
    </ul>
  </li>

</ul>


ul {
  list-style-type: none;
  position: relative; 
}
ul li:hover {
  color: blue;
  cursor: pointer;
  background-color: yellow;
}
ul > li{    
    display:inline-block;
}
ul li > ul{
    display:none;    
}

ul li > ul li{
    display:block; 
    color:#fff;
}
ul li:hover > ul{
  display: block;
  position: absolute;
  border: 1px solid #000;
  background:blue;  
}
ul li ul{
    position: relative;    
}
ul li ul li ul{    
    position: absolute;
    border: 1px solid #000;
    left: 100%;
}
ul li ul li:hover > ul {
  display: block;

}

Demo