如何将CSS应用于除悬停元素以外的其他元素？

Question

在网页上，你会看到很多美丽的悬停效果，尤其是用于作品集页面时，当你悬停在一个项目上时，其他项目将会变得不透明，因此你所悬停的项目将会被突出显示。

我尝试实现了这个效果，并且完成了这个代码（还有一个更详细的版本在CodePen中）：

a {
  text-decoration: none;
  transition: color 0.1s linear; 
  -moz-transition: color 0.1s linear; 
  -webkit-transition: color 0.1s linear; 
  -o-transition: color 0.1s linear;
}

a:link, a:visited { color: inherit; } /* Body color */
a:hover, a:active { color: #d7354a; }

h1, h2, h3, h4, h5, h6 { font-weight: normal; /*margin: 16px 0;*/ } 

h1 { 
  font-family: "Adelle", Arial, sans-serif;
  font-size: 80px; 
  line-height: 90px;
}

h3, h4 { color: #000; }
h3 { 
  font-size: 28px; /* 28px / 16px = 100% */ 
  font-weight: 600;
  line-height: 38px; 
}

.txt-center { text-align: center; }

body {
  margin: auto;
  font-family: "Merriweather", Arial, sans-serif;
  font-size: 18px; /* 18px = 100% */
  line-height: 26px;
  letter-spacing: 1px;
  color: #6f6f6f;
  -webkit-font-smoothing: none; 
  -webkit-font-smoothing: subpixel-antialiased; 
  -webkit-font-smoothing: antialiased; 
}

section { 
  padding: 80px 0; 
  position: relative;
}

#register div:hover .group { opacity: .5; }
#register div .group:hover { opacity: 1; }

#register hgroup { margin-bottom: 80px; }
#register .group a {
  display: block;
  color: #333; 
}

#register .group a:hover .button { 
  background: #FFF; 
  color: #d7354a;
  -webkit-transition: all 0.2s ease;
  -moz-transition: all 0.2s ease;
  -ms-transition: all 0.2s ease;
  -o-transition: all 0.2s ease;
  transition: all 0.2s ease;
}

#register .group figure { margin-bottom: 30px; }
#register .group figure img {
  display: inline-block;
  vertical-align: middle;
  -webkit-transform: translateZ(0);
  -moz-transform: translateZ(0);
  -o-transform: translateZ(0);
  transform: translateZ(0);
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
  -webkit-transition-duration: 0.3s;
  -moz-transition-duration: 0.3s;
  -o-transition-duration: 0.3s;
  transition-duration: 0.3s;
  -webkit-transition-property: transform;
  -moz-transition-property: transform;
  -o-transition-property: transform;
  transition-property: transform;
  -webkit-transition-timing-function: ease-out;
  -moz-transition-timing-function: ease-out;
  -o-transition-timing-function: ease-out;
  transition-timing-function: ease-out;
}

#register .group:hover figure img {
  -webkit-transform: translateY(-6px);
  transform: translateY(-6px);
}

#register .group p:first-of-type { 
  font-family: "Ubuntu", Arial, sans-serif;
  font-size: 22px;
  font-weight: 500; 
}

#register .group h3 { 
  font-size: 70px;
  line-height: 100px;
  font-weight: 400;
  color: inherit; 
  text-transform: lowercase;
}

<link href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css" rel="stylesheet"/>


<main class="main">
  <section class="page-header" id="register">
    <div class="container">
      <div class="row">
        <hgroup class="col-md-10 col-md-offset-1 txt-center">
          <h1>
            Register
          </h1>

        </hgroup><!-- End hgroup.col-md-10 col-md-offset-1 -->

        <div class="col-md-6 group txt-center">
          <a href="#">
            <figure>
              <img src="http://placehold.it/120x120" alt="Register as Watcher">
            </figure>
            <p>Register as</p>
            <h3>Watcher</h3>
            <p>
              Suspendisse sodales ut neque ut facilisis. <br>
              Cras lobortis vestibulum varius.
            </p>
            <div class="button secondary">I am a watcher</div>
          </a>
        </div><!-- End div.col-md-6 group txt-center -->

        <div class="col-md-6 group txt-center">
          <a href="#">
            <figure>
              <img src="http://placehold.it/120x120" alt="Register as Vlogger">
            </figure>
            <p>Register as</p>
            <h3>Vlogger</h3>
            <p>
              Suspendisse sodales ut neque ut facilisis. <br>
              Cras lobortis vestibulum varius.
            </p>
            <div class="button secondary">I am a vlogger</div>
          </a>
        </div><!-- End div.col-md-6 group txt-center -->


      </div><!-- End div.row -->
    </div><!-- End div.container -->

  </section><!-- End section#hero -->
</main>

但问题是，当您的光标已经在某个区域（围绕着“注册”文本）时，它会使两个项目的不透明度降低。这不是我想要的。我想要的是，当您悬停在

上时，它会使另一个项目的不透明度降低。

我知道您可以使用jQuery实现此目的，但我也知道这应该可以仅使用CSS实现。我该如何实现我所寻找的内容？

- Caspert

---

http://stackoverflow.com/questions/12400561/sibling-hover-opacity - Vitorino fernandes

http://stackoverflow.com/questions/7234221/toggle-opacity-on-other-divs - Vitorino fernandes

Answer 1

解决方案实际上很简单，考虑到您已经在实现它方面取得了多大的进展。以下是我所做的修复：

- 添加了另一个选择器，当鼠标悬停在具有“注册”文本的

上时，将所有兄弟元素<.group>的不透明度设置为1。 - 将

上的margin-bottom: 80px更改为padding-bottom: 80px，因为边距不是元素的一部分，而填充占用的区域是元素的一部分。因此，选择器会应用于“注册”按钮下方的空间（但不包括<.group>内部）。 - 向

添加了margin-left: 0px，因为Bootstrap CSS默认为

元素提供了80像素的左边距，这会导致选择器出现问题。

在下面的代码片段中，我还为您添加了黑色边框，以便您看到边界。

a {
  text-decoration: none;
  transition: color 0.1s linear; 
  -moz-transition: color 0.1s linear; 
  -webkit-transition: color 0.1s linear; 
  -o-transition: color 0.1s linear;
}

a:link, a:visited { color: inherit; } /* Body color */
a:hover, a:active { color: #d7354a; }

h1, h2, h3, h4, h5, h6 { font-weight: normal; /*margin: 16px 0;*/ } 

h1 { 
  font-family: "Adelle", Arial, sans-serif;
  font-size: 80px; 
  line-height: 90px;
}

h3, h4 { color: #000; }
h3 { 
  font-size: 28px; /* 28px / 16px = 100% */ 
  font-weight: 600;
  line-height: 38px; 
}

.txt-center { text-align: center; }

body {
  margin: auto;
  font-family: "Merriweather", Arial, sans-serif;
  font-size: 18px; /* 18px = 100% */
  line-height: 26px;
  letter-spacing: 1px;
  color: #6f6f6f;
  -webkit-font-smoothing: none; 
  -webkit-font-smoothing: subpixel-antialiased; 
  -webkit-font-smoothing: antialiased; 
}

section { 
  padding: 80px 0;
  position: relative;
}

#register div:hover .group { opacity: .5; }
#register hgroup:hover ~ .group { opacity: 1; }
#register div .group:hover { opacity: 1; }

#register hgroup { 
  padding-bottom: 80px; 
  width: 100%;
  margin-left: 0;
}
#register .group a {
  display: block;
  color: #333; 
}

#register .group a:hover .button { 
  background: #FFF; 
  color: #d7354a;
  -webkit-transition: all 0.2s ease;
  -moz-transition: all 0.2s ease;
  -ms-transition: all 0.2s ease;
  -o-transition: all 0.2s ease;
  transition: all 0.2s ease;
}

#register .group figure { margin-bottom: 30px; }
#register .group figure img {
  display: inline-block;
  vertical-align: middle;
  -webkit-transform: translateZ(0);
  -moz-transform: translateZ(0);
  -o-transform: translateZ(0);
  transform: translateZ(0);
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
  -webkit-transition-duration: 0.3s;
  -moz-transition-duration: 0.3s;
  -o-transition-duration: 0.3s;
  transition-duration: 0.3s;
  -webkit-transition-property: transform;
  -moz-transition-property: transform;
  -o-transition-property: transform;
  transition-property: transform;
  -webkit-transition-timing-function: ease-out;
  -moz-transition-timing-function: ease-out;
  -o-transition-timing-function: ease-out;
  transition-timing-function: ease-out;
}

#register .group:hover figure img {
  -webkit-transform: translateY(-6px);
  transform: translateY(-6px);
}

#register .group p:first-of-type { 
  font-family: "Ubuntu", Arial, sans-serif;
  font-size: 22px;
  font-weight: 500; 
}

#register .group h3 { 
  font-size: 70px;
  line-height: 100px;
  font-weight: 400;
  color: inherit; 
  text-transform: lowercase;
}

hgroup, .group{
  border: 1px solid;
}

<link href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css" rel="stylesheet"/>


<main class="main">
  <section class="page-header" id="register">
    <div class="container">
      <div class="row">
        <hgroup class="col-md-10 col-md-offset-1 txt-center">
          <h1>
            Register
          </h1>

        </hgroup><!-- End hgroup.col-md-10 col-md-offset-1 -->

        <div class="col-md-6 group txt-center">
          <a href="#">
            <figure>
              <img src="http://placehold.it/120x120" alt="Register as Watcher">
            </figure>
            <p>Register as</p>
            <h3>Watcher</h3>
            <p>
              Suspendisse sodales ut neque ut facilisis. <br>
              Cras lobortis vestibulum varius.
            </p>
            <div class="button secondary">I am a watcher</div>
          </a>
        </div><!-- End div.col-md-6 group txt-center -->

        <div class="col-md-6 group txt-center">
          <a href="#">
            <figure>
              <img src="http://placehold.it/120x120" alt="Register as Vlogger">
            </figure>
            <p>Register as</p>
            <h3>Vlogger</h3>
            <p>
              Suspendisse sodales ut neque ut facilisis. <br>
              Cras lobortis vestibulum varius.
            </p>
            <div class="button secondary">I am a vlogger</div>
          </a>
        </div><!-- End div.col-md-6 group txt-center -->


      </div><!-- End div.row -->
    </div><!-- End div.container -->

  </section><!-- End section#hero -->
</main>

- Harry

Answer 2

从你的例子：

 #register div:hover .group { opacity: .5; }
 #register div .group:hover { opacity: 1; }

- Tarik Khvyl

---

是的，但现在的问题是，当我将鼠标悬停在“注册”文本上时，它会使两个项目的不透明度降低，这不是我想要的。只有当您将鼠标悬停在另一个项目上时，它才应该使另一个项目的不透明度降低。 - Caspert