How to apply child:hover but not parent:hover

问题:

With the following html, when I hover over child, I get a green background on parent. How can I stop that from happening? I do want the green background if I am hovering outside of the child element.

CSS3 is fine.

<style>
        .parent { padding: 100px; width: 400px; height:400px; }
        .parent:hover { background-color: green; }
        .child { padding: 100px; width: 200px; height:200px; }
        .child:hover { background-color: blue; }
</style>
<div class="parent">
        <div class="child">Child</div>
</div>

回答1:

So this is REALLY ugly, but it works (kind of). I'm basically creating a duplicate of parent as a sibling of child. parent-overwrite is hidden by default, then displayed on the hover of child. Chrome doesn't like it unless you use the + selector instead of the ~ selector. This isn't very scalable, but it may work.

As the other guys posted, javascript would likely be a better solution.

<style>
    .parent { padding: 100px; width: 400px; height:400px; position: relative; z-index: 998; }
    .parent:hover { background-color: green; }
    .child { padding: 100px; width: 200px; height:200px; position: relative; z-index: 1000; }
    .child:hover { background-color: blue; }
    .parent-overwrite { padding: inherit; width: inherit; height: inherit; position: absolute; top: 0; left: 0; z-index: 999; background-color: #FFF; display: none; }
    .child:hover ~ .parent-overwrite { display: block; }
</style>

<div class="parent">
    <div class="child">Child</div>
    <div class="parent-overwrite"></div>
</div>

回答2:

I can only do this with adding additional markup. An empty div needs to be added that essentially functions as the parent background. Take a look at the CSS here.

HTML Part:

  <div class="parent">
    Parent
    <div class="child">
      Child
      <div class="grandson">
        Grandson
        <div class="grandson-bg"></div>
      </div>
      <div class="child-bg"></div>
    </div>
    <div class="parent-bg"></div>
  </div>

CSS part:

article, aside, figure, footer, header, hgroup, menu, nav, section { display: block; }

  .parent { display: block; position: relative; z-index: 0;
            height: auto; width: auto; padding: 25px;
          }

  .parent-bg { display: block; height: 100%; width: 100%; 
               position: absolute; top: 0px; left: 0px; 
               border: 1px solid white; z-index: 0; 
             }
  .parent-bg:hover { border: 1px solid red; }

  .child { display: block; position: relative; z-index: 1; 
           height: auto; width: auto; padding: 25px;
         }

  .child-bg { display: block; height: 100%; width: 100%; 
              position: absolute; top: 0px; left: 0px; 
              border: 1px solid white; z-index: 0; 
            }
  .child-bg:hover { border: 1px solid red; }

  .grandson { display: block; position: relative; z-index: 2; 
              height: auto; width: auto; padding: 25px;
            }

  .grandson-bg { display: block; height: 100%; width: 100%; 
                 position: absolute; top: 0px; left: 0px; 
                 border: 1px solid white; z-index: 0; 
               }
  .grandson-bg:hover { border: 1px solid red; }

http://jsbin.com/ubiyo3/edit

回答3:

The easiest thing to do may be to use JS for this sort of CSS. Maybe you can try to rethink your implementation. Why are you trying to do something like this?

回答4:

This is not possible using plain-vanilla CSS. You're asking for a pseudo-class of a child (child:hover) to affect the background declaration of a parent. There's no way to specify that sort of thing using regular css.

This can definitely be done using javascript.

回答5:

I have what i think is a better solution, since it is scalable to more levels, as many as wanted, not only two or three.

I use borders, but it can also be done with whatever style wanted, like background-color.

With the border, the idea is to:

• Have a different border color only one div, the div over where the mouse is, not on any parent, not on any child, so it can be seen only such div border in a different color while the rest stays on white.

You can test it at: http://jsbin.com/ubiyo3/13

And here is the code:

<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8 />
<title>Hierarchie Borders MarkUp</title>
<style>

  .parent { display: block; position: relative; z-index: 0;
            height: auto; width: auto; padding: 25px;
          }

  .parent-bg { display: block; height: 100%; width: 100%; 
               position: absolute; top: 0px; left: 0px; 
               border: 1px solid white; z-index: 0; 
             }
  .parent-bg:hover { border: 1px solid red; }

  .child { display: block; position: relative; z-index: 1; 
           height: auto; width: auto; padding: 25px;
         }

  .child-bg { display: block; height: 100%; width: 100%; 
              position: absolute; top: 0px; left: 0px; 
              border: 1px solid white; z-index: 0; 
            }
  .child-bg:hover { border: 1px solid red; }

  .grandson { display: block; position: relative; z-index: 2; 
              height: auto; width: auto; padding: 25px;
            }

  .grandson-bg { display: block; height: 100%; width: 100%; 
                 position: absolute; top: 0px; left: 0px; 
                 border: 1px solid white; z-index: 0; 
               }
  .grandson-bg:hover { border: 1px solid red; }

</style>
</head>
<body>
  <div class="parent">
    Parent
    <div class="child">
      Child
      <div class="grandson">
        Grandson
        <div class="grandson-bg"></div>
      </div>
      <div class="child-bg"></div>
    </div>
    <div class="parent-bg"></div>
  </div>
</body>
</html>