84

我有一个网站，我决定用纯 CSS 片段替换基于 jquery 的切换框。当我为过渡使用固定高度值（CSS的最后几行）时，效果很好，但是有了该auto值，动画就消失了，只有高度变化才有效果！

有没有办法将它与自动值一起使用？我想使用可变文本而不是脚本。

.ac-container{
  width: 400px;
  margin: 10px auto 30px auto;
  text-align: left;
}
.ac-container label{
  font-family: 'BebasNeueRegular', 'Arial Narrow', Arial, sans-serif;
  padding: 5px 20px;
  position: relative;
  z-index: 20;
  display: block;
  height: 30px;
  cursor: pointer;
  color: #777;
  text-shadow: 1px 1px 1px rgba(255,255,255,0.8);
  line-height: 33px;
  font-size: 19px;
  background: #ffffff;
  background: -moz-linear-gradient(top, #ffffff 1%, #eaeaea 100%);
  background: -webkit-gradient(linear, left top, left bottom, color-stop(1%,#ffffff), color-stop(100%,#eaeaea));
  background: -webkit-linear-gradient(top, #ffffff 1%,#eaeaea 100%);
  background: -o-linear-gradient(top, #ffffff 1%,#eaeaea 100%);
  background: -ms-linear-gradient(top, #ffffff 1%,#eaeaea 100%);
  background: linear-gradient(top, #ffffff 1%,#eaeaea 100%);
  filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#ffffff', endColorstr='#eaeaea',GradientType=0 );
  box-shadow: 
    0px 0px 0px 1px rgba(155,155,155,0.3), 
    1px 0px 0px 0px rgba(255,255,255,0.9) inset, 
    0px 2px 2px rgba(0,0,0,0.1);
}
.ac-container label:hover{
  background: #fff;
}
.ac-container input:checked + label,
.ac-container input:checked + label:hover{
  background: #c6e1ec;
  color: #3d7489;
  text-shadow: 0px 1px 1px rgba(255,255,255, 0.6);
  box-shadow: 
    0px 0px 0px 1px rgba(155,155,155,0.3), 
    0px 2px 2px rgba(0,0,0,0.1);
}

.ac-container input{
  display: none;
}
.ac-container section{
  background: rgba(255, 255, 255, 0.5);
  margin-top: -1px;
  overflow: hidden;
  height: 0px;
  position: relative;
  z-index: 10;
  -webkit-transition: height 0.3s ease-in-out, box-shadow 0.6s linear;
  -moz-transition: height 0.3s ease-in-out, box-shadow 0.6s linear;
  -o-transition: height 0.3s ease-in-out, box-shadow 0.6s linear;
  -ms-transition: height 0.3s ease-in-out, box-shadow 0.6s linear;
  transition: height 0.3s ease-in-out, box-shadow 0.6s linear;
}
.ac-container section p{
  font-style: italic;
  color: #777;
  line-height: 23px;
  font-size: 14px;
  padding: 20px;
  text-shadow: 1px 1px 1px rgba(255,255,255,0.8);
}
.ac-container input:checked ~ section{
  -webkit-transition: height 0.5s ease-in-out, box-shadow 0.1s linear;
  -moz-transition: height 0.5s ease-in-out, box-shadow 0.1s linear;
  -o-transition: height 0.5s ease-in-out, box-shadow 0.1s linear;
  -ms-transition: height 0.5s ease-in-out, box-shadow 0.1s linear;
  transition: height 0.5s ease-in-out, box-shadow 0.1s linear;
  box-shadow: 0px 0px 0px 1px rgba(155,155,155,0.3);
}
.ac-container input:checked ~ section.ac-small{
  height: 120px; /*auto*/
}
<div class="ac-container">
  <div>

    <input id="ac-1" name="accordion-1" type="checkbox" />
    <section class="ac-small">
      <p>Some content... </p>
    </section>
    <label for="ac-1">About us</label>

  </div>	

  <div>	
    <input id="ac-2" name="accordion-2" type="checkbox" />
    <section class="ac-small">
      <p>Some content... </p>
    </section>
    <label for="ac-2">About us</label>
  </div>
</div>

4

5 回答 5

108

如果您只想使用 CSS，一种解决方案是转换max-height而不是height并将其设置为比它所能获得的更大的东西......

这是一个演示

您将需要稍微调整过渡的速度，但至少该示例让您了解如何完成。不要忘记在过渡中更改属性。从transition: height 0.5s;到transition: max-height 0.5s;。

希望这可以帮助！

.ac-container{
    width: 400px;
    margin: 10px auto 30px auto;
    text-align: left;
}
.ac-container label{
    font-family: 'BebasNeueRegular', 'Arial Narrow', Arial, sans-serif;
    padding: 5px 20px;
    position: relative;
    z-index: 20;
    display: block;
    height: 30px;
    cursor: pointer;
    color: #777;
    text-shadow: 1px 1px 1px rgba(255,255,255,0.8);
    line-height: 33px;
    font-size: 19px;
    background: #ffffff;
    background: -moz-linear-gradient(top, #ffffff 1%, #eaeaea 100%);
    background: -webkit-gradient(linear, left top, left bottom, color-stop(1%,#ffffff), color-stop(100%,#eaeaea));
    background: -webkit-linear-gradient(top, #ffffff 1%,#eaeaea 100%);
    background: -o-linear-gradient(top, #ffffff 1%,#eaeaea 100%);
    background: -ms-linear-gradient(top, #ffffff 1%,#eaeaea 100%);
    background: linear-gradient(top, #ffffff 1%,#eaeaea 100%);
    filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#ffffff', endColorstr='#eaeaea',GradientType=0 );
    box-shadow: 
        0px 0px 0px 1px rgba(155,155,155,0.3), 
        1px 0px 0px 0px rgba(255,255,255,0.9) inset, 
        0px 2px 2px rgba(0,0,0,0.1);
}
.ac-container label:hover{
    background: #fff;
}
.ac-container input:checked + label,
.ac-container input:checked + label:hover{
    background: #c6e1ec;
    color: #3d7489;
    text-shadow: 0px 1px 1px rgba(255,255,255, 0.6);
    box-shadow: 
        0px 0px 0px 1px rgba(155,155,155,0.3), 
        0px 2px 2px rgba(0,0,0,0.1);
}

.ac-container input{
    display: none;
}
.ac-container section{
    background: rgba(255, 255, 255, 0.5);
    margin-top: -1px;
    overflow: hidden;
    max-height: 0px;
    position: relative;
    z-index: 10;
    -webkit-transition: max-height 0.3s ease-in-out, box-shadow 0.6s linear;
    -moz-transition: max-height 0.3s ease-in-out, box-shadow 0.6s linear;
    -o-transition: max-height 0.3s ease-in-out, box-shadow 0.6s linear;
    -ms-transition: max-height 0.3s ease-in-out, box-shadow 0.6s linear;
    transition: max-height 0.3s ease-in-out, box-shadow 0.6s linear;
}
.ac-container section p{
    font-style: italic;
    color: #777;
    line-height: 23px;
    font-size: 14px;
    padding: 20px;
    text-shadow: 1px 1px 1px rgba(255,255,255,0.8);
}
.ac-container input:checked ~ section{
    -webkit-transition: max-height 0.5s ease-in-out, box-shadow 0.1s linear;
    -moz-transition: max-height 0.5s ease-in-out, box-shadow 0.1s linear;
    -o-transition: max-height 0.5s ease-in-out, box-shadow 0.1s linear;
    -ms-transition: max-height 0.5s ease-in-out, box-shadow 0.1s linear;
    transition: max-height 0.5s ease-in-out, box-shadow 0.1s linear;
    box-shadow: 0px 0px 0px 1px rgba(155,155,155,0.3);
}
.ac-container input:checked ~ section.ac-small{
    max-height: 500px; /*auto*/
}
<div class="ac-container">
    <div>
        
        <input id="ac-1" name="accordion-1" type="checkbox" />
        <section class="ac-small">
            <p>Some content...Some content... Some content... Some content... Some content... Some content... Some content... Some content... Some content... Some content... Some content... Some content... Some content... Some content... Some content... Some content... Some content... Some content... Some content... Some content... Some content... Some content...  </p>
        </section>
        <label for="ac-1">About us</label>
        
    </div>    

<div>    
        <input id="ac-2" name="accordion-2" type="checkbox" />
        <section class="ac-small">
            <p>Some content... </p>
        </section>
        <label for="ac-2">About us</label>
</div>
</div>

于 2012-12-18T17:53:49.167 回答
19

您不能对“自动”维度进行动画处理（不幸的是）。我通常的方法是为具有单个子元素的外部 DIV 的高度设置动画，该子元素是仅用于测量内容高度的无样式 DIV。

function growDiv() {
  var growDiv = document.getElementById('grow');
  if (growDiv.clientHeight) {
    growDiv.style.height = 0;
  } else {
    var wrapper = document.querySelector('.measuringWrapper');
    growDiv.style.height = wrapper.clientHeight + "px";
  }
}
#grow {
  -moz-transition: height .5s;
  -ms-transition: height .5s;
  -o-transition: height .5s;
  -webkit-transition: height .5s;
  transition: height .5s;
  height: 0;
  overflow: hidden;
  outline: 1px solid red;
}
<input type="button" onclick="growDiv()" value="grow">
<div id='grow'>
  <div class='measuringWrapper'>
    <div>
      The contents of my div.
    </div>
    <div>
      The contents of my div.
    </div>
    <div>
      The contents of my div.
    </div>
    <div>
      The contents of my div.
    </div>
    <div>
      The contents of my div.
    </div>
    <div>
      The contents of my div.
    </div>
  </div>
</div>

于 2012-12-18T17:57:18.913 回答
15

您应该使用 scaleY。

ul {
  background-color: #eee;
  transform: scaleY(0);    
  transform-origin: top;
  transition: transform 0.3s ease-in-out;
}    
p:hover ~ ul {
  transform: scaleY(1);
}
<p>Here (scaleY(1))</p>
<ul>
  <li>Coffee</li>
  <li>Tea</li>
  <li>Milk</li>
</ul>

或者，您可以使用clip剪切列表。

ul {
  clip: rect(auto, auto, 0, auto);
  position: absolute;
  margin: 0;
  padding: .5rem;

  color: white;

  background-color: rgba(0, 0, 0, 0.8);

  transition-delay: 0.29s;
  transition-property: clip;
  transition-duration: 0.5s;
  transition-timing-function: cubic-bezier(0.175, 0.885, 0.32, 1.275);
}
h3:hover ~ ul,
h3:active ~ ul {
  clip: rect(auto, auto, 10rem, auto);
}
<h3>Hover here</h3>
<ul>
  <li>This list</li>
  <li>is clipped.</li>
  <li>A clip transition</li>
  <li>will show it</li>
</ul>
<p>
  Some text...
</p>

于 2013-06-23T11:40:02.727 回答
8

CSS 过渡不适用于自动值。使用 JavaScript 获取滚动高度el.scrollHeight或使用 max-height 代替。

于 2012-12-18T17:41:08.567 回答
2

auto不是可动画属性的合适类型，请参阅CSS 过渡：7. 可动画属性。您需要长度 ( px, em,...) 或百分比 ( 13.37%)。

因此，只有 CSS 解决方案是不可能的，只要auto不添加到列表中。您需要使用 JavaScript 或特定的长度值。

于 2012-12-18T17:42:38.330 回答