如何仅在CSS中悬停显示文本

时间：2016-08-23 16:58:30

标签： css twitter-bootstrap

大家好我从网站上获得了一些代码我试图对其进行修改但是无法在此处执行代码我想要隐藏的代码<h2>标记内容仅在我悬停在其上时才可见我试过显示：无;并在悬停显示：块;同样可见：隐藏或可见，但我没有为我工作。

HTML 

<div class="col-lg-3 col-md-4 col-sm-6 col-xs-12">
<div class="hovereffect">
<img class="img-responsive" src="http://placehold.it/350x200" alt="">
<div class="overlay">
<h2>Effect 12</h2>
<p> 
<a href="#">LINK HERE</a>
</p> 
</div>
</div>
</div>

CSS 

.hovereffect {
  width: 100%;
  height: 100%;
  float: left;
  overflow: hidden;
  position: relative;
  text-align: center;
  cursor: default;
  background: #42b078;
}

.hovereffect .overlay {
  width: 100%;
  height: 100%;
  position: absolute;
  overflow: hidden;
  top: 0;
  left: 0;
  padding: 50px 20px;
}

.hovereffect img {
  display: block;
  position: relative;
  max-width: none;
  width: calc(100% + 20px);
  -webkit-transition: opacity 0.35s, -webkit-transform 0.35s;
  transition: opacity 0.35s, transform 0.35s;
  -webkit-transform: translate3d(-10px,0,0);
  transform: translate3d(-10px,0,0);
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
}

.hovereffect:hover img {
  opacity: 0.4;
  filter: alpha(opacity=40);
  -webkit-transform: translate3d(0,0,0);
  transform: translate3d(0,0,0);
}

.hovereffect h2 {
  text-transform: uppercase;
  color: #fff;
  text-align: center;
  position: relative;
  font-size: 17px;
  overflow: hidden;
  padding: 0.5em 0;
  background-color: transparent;

}

.hovereffect h2:after {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: #fff;
  content: '';
  -webkit-transition: -webkit-transform 0.35s;
  transition: transform 0.35s;
  -webkit-transform: translate3d(-100%,0,0);
  transform: translate3d(-100%,0,0);
}

.hovereffect:hover h2:after {
  -webkit-transform: translate3d(0,0,0);
  transform: translate3d(0,0,0);
}

.hovereffect a, .hovereffect p {
  color: #FFF;
  opacity: 0;
  filter: alpha(opacity=0);
  -webkit-transition: opacity 0.35s, -webkit-transform 0.35s;
  transition: opacity 0.35s, transform 0.35s;
  -webkit-transform: translate3d(100%,0,0);
  transform: translate3d(100%,0,0);
}

.hovereffect:hover a, .hovereffect:hover p {
  opacity: 1;
  filter: alpha(opacity=100);
  -webkit-transform: translate3d(0,0,0);
  transform: translate3d(0,0,0);
}

4 个答案:

答案 0 :(得分：2)

我将visibility: hidden;添加到此块：

.hovereffect .overlay {
  width: 100%;
  height: 100%;
  position: absolute;
  overflow: hidden;
  top: 0;
  left: 0;
  padding: 50px 20px;
  /* here */
  visibility: hidden;
}

我添加此块以在.hovereffect上悬停后显示叠加层：

.hovereffect:hover .overlay{
  visibility: visible;
}

最终的css：

.hovereffect {
  width: 100%;
  height: 100%;
  float: left;
  overflow: hidden;
  position: relative;
  text-align: center;
  cursor: default;
  background: #42b078;
}

.hovereffect .overlay {
  width: 100%;
  height: 100%;
  position: absolute;
  overflow: hidden;
  top: 0;
  left: 0;
  padding: 50px 20px;
  visibility: hidden;
}

.hovereffect img {
  display: block;
  position: relative;
  max-width: none;
  width: calc(100% + 20px);
  -webkit-transition: opacity 0.35s, -webkit-transform 0.35s;
  transition: opacity 0.35s, transform 0.35s;
  -webkit-transform: translate3d(-10px,0,0);
  transform: translate3d(-10px,0,0);
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
}

.hovereffect:hover .overlay{
  visibility: visible;
}

.hovereffect:hover img {
  opacity: 0.4;
  filter: alpha(opacity=40);
  -webkit-transform: translate3d(0,0,0);
  transform: translate3d(0,0,0);
}

.hovereffect h2 {
  text-transform: uppercase;
  color: #fff;
  text-align: center;
  position: relative;
  font-size: 17px;
  overflow: hidden;
  padding: 0.5em 0;
  background-color: transparent;

}

.hovereffect h2:after {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: #fff;
  content: '';
  -webkit-transition: -webkit-transform 0.35s;
  transition: transform 0.35s;
  -webkit-transform: translate3d(-100%,0,0);
  transform: translate3d(-100%,0,0);
}

.hovereffect:hover h2:after {
  -webkit-transform: translate3d(0,0,0);
  transform: translate3d(0,0,0);
}

.hovereffect a, .hovereffect p {
  color: #FFF;
  opacity: 0;
  filter: alpha(opacity=0);
  -webkit-transition: opacity 0.35s, -webkit-transform 0.35s;
  transition: opacity 0.35s, transform 0.35s;
  -webkit-transform: translate3d(100%,0,0);
  transform: translate3d(100%,0,0);
}

.hovereffect:hover a, .hovereffect:hover p {
  opacity: 1;
  filter: alpha(opacity=100);
  -webkit-transform: translate3d(0,0,0);
  transform: translate3d(0,0,0);
}

演示：https://jsfiddle.net/jbg6tmLh/2/

答案 1 :(得分：0)

这里有一个有效的jsfiddle 

.overlay h2{
  opacity:0
}
.overlay h2:hover{
  opacity:1;
}

答案 2 :(得分：0)

将display:none;添加到您的.hovereffect h2代码中，然后添加以下css：

.hovereffect:hover h2{
  display: block;
}

以下是其中的一个小提琴：https://jsfiddle.net/87cf2Lhy/

答案 3 :(得分：0)

对于过渡和动画等内容，您希望尽可能避免更改DOM流。

即使您在叠加层上使用这些内容并且不会造成严重的性能损失，您应该避免使用display: none然后将其值更改为阻止。这样你就会习惯更好的CSS实践。

这里最好的方法是使用不透明度。

逻辑很简单：

element {
  opacity: 0;
}

element:hover {
  opacity: 1;
}


.hovereffect {
  width: 100%;
  height: 100%;
  float: left;
  overflow: hidden;
  position: relative;
  text-align: center;
  cursor: default;
  background: #42b078;
}
.hovereffect .overlay {
  width: 100%;
  height: 100%;
  position: absolute;
  overflow: hidden;
  top: 0;
  left: 0;
  padding: 50px 20px;
}
.hovereffect img {
  display: block;
  position: relative;
  max-width: none;
  width: calc(100% + 20px);
  -webkit-transition: opacity 0.35s, -webkit-transform 0.35s;
  transition: opacity 0.35s, transform 0.35s;
  -webkit-transform: translate3d(-10px, 0, 0);
  transform: translate3d(-10px, 0, 0);
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
}
.hovereffect:hover img {
  opacity: 0.4;
  filter: alpha(opacity=40);
  -webkit-transform: translate3d(0, 0, 0);
  transform: translate3d(0, 0, 0);
}
.hovereffect h2 {
  text-transform: uppercase;
  color: #fff;
  text-align: center;
  position: relative;
  font-size: 17px;
  overflow: hidden;
  padding: 0.5em 0;
  background-color: transparent;
  opacity: 0;
  transition: opacity 0.35s;
}
.hovereffect h2:after {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: #fff;
  content: '';
  -webkit-transition: -webkit-transform 0.35s;
  transition: transform 0.35s;
  -webkit-transform: translate3d(-100%, 0, 0);
  transform: translate3d(-100%, 0, 0);
}
.hovereffect:hover h2 {
  opacity: 1;
}
.hovereffect:hover h2:after {
  -webkit-transform: translate3d(0, 0, 0);
  transform: translate3d(0, 0, 0);
}
.hovereffect a,
.hovereffect p {
  color: #FFF;
  opacity: 0;
  filter: alpha(opacity=0);
  -webkit-transition: opacity 0.35s, -webkit-transform 0.35s;
  transition: opacity 0.35s, transform 0.35s;
  -webkit-transform: translate3d(100%, 0, 0);
  transform: translate3d(100%, 0, 0);
}
.hovereffect:hover a,
.hovereffect:hover p {
  opacity: 1;
  filter: alpha(opacity=100);
  -webkit-transform: translate3d(0, 0, 0);
  transform: translate3d(0, 0, 0);
}
<div class="col-lg-3 col-md-4 col-sm-6 col-xs-12">
  <div class="hovereffect">
    <img class="img-responsive" src="http://placehold.it/350x200" alt="">
    <div class="overlay">
      <h2>Effect 12</h2>
      <p>
        <a href="#">LINK HERE</a>
      </p>
    </div>
  </div>
</div>

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