如何将上滑和下滑动画添加到可变高度 div？

Question

当我将鼠标悬停在 div 卡上时，我想添加上滑和下滑动画。

初始卡片：

当我将鼠标悬停在卡片上时：

黄色部分应该向上滑动，当我移除悬停时它应该向下滑动直到它不可见。

我可以在悬停时显示和隐藏黄色部分，但我无法动画它。我猜是因为top: 182px; bottom: auto;（用于隐藏黄色部分并将紫色部分放置在底部）和top:auto;bottom:0;（无论高度如何都完全显示黄牌）

代码如下：

.card{
  margin-right:20px;
display: inline-block;
    padding: 0;
    border-radius: 19px;
    box-shadow: 0 6px 10px 0 rgba(0, 0, 0, 0.2);
    overflow: hidden;
    height: 200px;
    background-color:#2196f3;
    position:relative;
    text-align:center;
}
.image{
  padding:50px;
}
.content{
  border-radius: 0 0 19px 19px;
        background-color: #673AB7;
    position: absolute;
    width: 100%;
    top: 182px;
    bottom: auto;
}
.desc{
  background-color:#ffeb3b;
}

.card:hover .content{
  top: auto;
    transition: all 2s ease;
    bottom: 0px;
}

<div class='card'>
    fixed height card
    <div class='image'>
        fixed height image
    </div>
    <div class='content'>
        <div class='title'>
            fixed height title
        </div>
        <div class='desc'>
            =:variable height description:= Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut
            labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud the end.
        </div>
    </div>
</div>

<div class='card'>
    fixed height card
    <div class='image'>
        fixed height image
    </div>
    <div class='content'>
        <div class='title'>
            fixed height title
        </div>
        <div class='desc'>
            =:variable height description:= Lorem ipsum dolor sit amet, consectecing elit, sed do eiusmod tempor incididunt ut the end.
        </div>
    </div>
</div>

这里是 JSFiddle：http://jsfiddle.net/JerryGoyal/63c8hbr5/

我对想法持开放态度，只要它只能用 CSS 来完成！

Answer 1

你是正确的，需要使用始终相同的位置技术。

你需要坚持到底，然后设置一个translateY

.card {
  margin-right: 20px;
  display: inline-block;
  padding: 0;
  border-radius: 19px;
  box-shadow: 0 6px 10px 0 rgba(0, 0, 0, 0.2);
  overflow: hidden;
  height: 200px;
  background-color: #2196f3;
  position: relative;
  text-align: center;
}

.image {
  padding: 50px;
}

.content {
  border-radius: 0 0 19px 19px;
  background-color: #673AB7;
  position: absolute;
  width: 100%;
  bottom: 18px;
  transform: translateY(100%);
  transition: all 2s ease;
}

.desc {
  background-color: #ffeb3b;
}

.card:hover .content {
  bottom: 0px;
  transform: translateY(0%);
}

<div class='card'>
  fixed height card
  <div class='image'>
    fixed height image
  </div>
  <div class='content'>
    <div class='title'>
      fixed height title
    </div>
    <div class='desc'>
      =:variable height description:= Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud the end.
    </div>
  </div>
</div>

<div class='card'>
  fixed height card
  <div class='image'>
    fixed height image
  </div>
  <div class='content'>
    <div class='title'>
      fixed height title
    </div>
    <div class='desc'>
      =:variable height description:= Lorem ipsum dolor sit amet, consectecing elit, sed do eiusmod tempor incididunt ut the end.
    </div>
  </div>
</div>

Answer 2

将过渡更改为在 desc div 上工作，而不是在 content 上工作。转换也不适用于 auto 属性。尝试使用我展示的 max-height 属性。最大高度应该是您的 div 可以获得的非常大的高度。

更新的 CSS

.card {
      margin-right: 20px;
      display: inline-block;
      padding: 0;
      border-radius: 19px;
      box-shadow: 0 6px 10px 0 rgba(0, 0, 0, 0.2);
      overflow: hidden;
      height: 200px;
      background-color: #2196f3;
      position: relative;
      text-align: center;
    }

    .image {
      padding: 50px;
    }

    .content {
      border-radius: 0 0 19px 19px;
      background-color: #673AB7;
      position: absolute;
      width: 100%;
      bottom: 0;
    }

    .desc {
      background-color: #ffeb3b;
      max-height: 0;
      transition: all 2s ease;
    }

    .card:hover .desc {
      max-height: 500px;
    }

.card {
  margin-right: 20px;
  display: inline-block;
  padding: 0;
  border-radius: 19px;
  box-shadow: 0 6px 10px 0 rgba(0, 0, 0, 0.2);
  overflow: hidden;
  height: 200px;
  background-color: #2196f3;
  position: relative;
  text-align: center;
}

.image {
  padding: 50px;
}

.content {
  border-radius: 0 0 19px 19px;
  background-color: #673AB7;
  position: absolute;
  width: 100%;
  bottom: 0;
}

.desc {
  background-color: #ffeb3b;
  max-height: 0;
  transition: all 2s ease;
}

.card:hover .desc {
  max-height: 500px;
}

<div class='card'>
  fixed height card
  <div class='image'>
    fixed height image
  </div>
  <div class='content'>
    <div class='title'>
      fixed height title
    </div>
    <div class='desc'>
      =:variable height description:= Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud the end.
    </div>
  </div>
</div>

<div class='card'>
  fixed height card
  <div class='image'>
    fixed height image
  </div>
  <div class='content'>
    <div class='title'>
      fixed height title
    </div>
    <div class='desc'>
      =:variable height description:= Lorem ipsum dolor sit amet, consectecing elit, sed do eiusmod tempor incididunt ut the end.
    </div>
  </div>
</div>

Answer 3

您可以使用关键帧在悬停内容上添加动画。

.card{
  margin-right:20px;
display: inline-block;
    padding: 0;
    border-radius: 19px;
    box-shadow: 0 6px 10px 0 rgba(0, 0, 0, 0.2);
    overflow: hidden;
    height: 200px;
    background-color:#2196f3;
    position:relative;
    text-align:center;
}
.image{
  padding:50px;
}
    .content{
  border-radius: 0 0 19px 19px;
        background-color: #673AB7;
    position: absolute;
    width: 100%;
    top: 182px;
    bottom: auto;
    animation-name: slideFromTop;
        -webkit-animation-name: slideFromTop;
        animation-duration: 800ms;
        -webkit-animation-duration: 800ms;
        animation-timing-function: ease-out;
        -webkit-animation-timing-function: ease-out;
        animation-fill-mode: forwards;
        -webkit-animation-fill-mode: forwards;
}
.desc{
  background-color:#ffeb3b;
}

.card:hover .content{
  top: auto;
    bottom: 0px;
    animation-name: slideFromBottom;
        -webkit-animation-name: slideFromBottom;
        animation-duration: 800ms;
        -webkit-animation-duration: 800ms;
        animation-timing-function: ease-in;
        -webkit-animation-timing-function: ease-in;
        animation-fill-mode: forwards;
        -webkit-animation-fill-mode: forwards;
  
}



@keyframes slideFromBottom  {
        0%{
            opacity:0;
            -webkit-transform: translateY(100%);
            -moz-transform: translateY(100%);
            -ms-transform: translateY(100%);
            -o-transform: translateY(100%);
            transform: translateY(100%);
        }
        100%{
            opacity: 1;
            -webkit-transform: translateY(0px);
            -moz-transform: translateY(0px);
            -ms-transform: translateY(0px);
            -o-transform: translateY(0px);
            transform: translateY(0px);
            display: block;
        }
    }
@keyframes slideFromTop  {
    0%{
        opacity:1;
        -webkit-transform: translateY(0px);
        -moz-transform: translateY(0px);
        -ms-transform: translateY(0px);
        -o-transform: translateY(0px);
        transform: translateY(0px);
    }
    100%{
        opacity: 0;
        -webkit-transform: translateY(100%);
        -moz-transform: translateY(100%);
        -ms-transform: translateY(400%);
        -o-transform: translateY(100%);
        transform: translateY(100%);
    }
}

<div class='card'>
    fixed height card
    <div class='image'>
        fixed height image
    </div>
    <div class='content'>
        <div class='title'>
            fixed height title
        </div>
        <div class='desc'>
            =:variable height description:= Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut
            labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud the end.
        </div>
    </div>
</div>

<div class='card'>
    fixed height card
    <div class='image'>
        fixed height image
    </div>
    <div class='content'>
        <div class='title'>
            fixed height title
        </div>
        <div class='desc'>
            =:variable height description:= Lorem ipsum dolor sit amet, consectecing elit, sed do eiusmod tempor incididunt ut the end.
        </div>
    </div>
</div>

您可以在此链接中查看JSFiddle

希望对你有帮助！

干杯！