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不使用固定背景高度的纯CSS视差效果？

cssparallaxcss-transforms
5
我正在尝试实现纯CSS视差效果，而无需固定背景高度。这在一些 地方已有描述，但它们共同的限制是必须知道背景层的固定高度。
由于某些动态内容，我希望在没有固定背景高度的情况下实现此效果。
我的最小示例在这里：https://jsfiddle.net/yf8oyben/ 

#container {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  perspective: 1px;
  overflow-x: hidden;
  overflow-y: scroll;
}
.background {
  transform: translateZ(-1px) scale(2);
  width: 100%;
  background: lightgreen;
  height: 250px;  /* Assumes bg height */
  position: absolute;  /* Assumes bg height */
  top: calc(125px - 50vh);  /* Assumes bg height */
}
.foreground {
  background: rgba(0, 0, 255, 0.5);
  width: 100%;
  position: absolute;  /* Assumes bg height */
  top: 250px;  /* Assumes bg height */
}
<body>
  <div id='container'>
    <div id="group1">
      <div class="background">
        <div style="height: 10rem"></div>
        <center>Banner</center>
        <div style="height: 10rem"></div>
      </div>
      <div class="foreground">
        <div style="height: 10rem"></div>
        <center>Content</center>
        <div style="height: 100rem"></div>
      </div>
    </div>
  </div>
</body>

现在它能够工作，但是假设背景是250px，就像CSS中所注释的那样。是否可能去掉这个限制，仍然保留当前的效果？
我曾经为这个问题苦苦挣扎，但是没有找到任何可能的解决方案。基本上，主要问题在于父级 div 无法将其高度设置为绝对子 div 的高度，因此您必须插入一行 js 代码来设置其高度。 - Emi-C
1个回答
3
您可以实现这种视差效果，而无需知道横幅的高度。您只需要放弃绝对定位并调整 perspective-origin 和 transform-orign 属性。它们需要相互重叠。

这是一个演示：CSS only parallax effect

*{margin:0;padding:0;}
#wrap{
  position:fixed;
  width:100%; height:100%;
  overflow-x:hidden;
  overflow-y:scroll;
  perspective: 1px;
  perspective-origin:0 0;
}
.bg{
  background:teal;
  transform-origin:0 0;
  transform: translateZ(-1px) scale(2);
}
.bg img{
  display:block;
  width:100%; height:auto;
}
.cont{
  position:relative;
  background:rgba(0,0,0,0.8);
  color:#fff;
  padding:5%;
}
.cont *{
  max-width:900px;
  margin:5% auto;
}
<div id="wrap">
  <div class="bg">
    <img src="http://i.imgur.com/hPLqUtN.jpg" alt="" />
  </div>
  <div class="cont">
    <h1>Lorem Ipsum</h1>
    <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Mauris et purus porta, porta dolor vel, pulvinar turpis. Suspendisse aliquam placerat turpis, sed ullamcorper nisl vestibulum eu. Lorem ipsum dolor sit amet, consectetur adipiscing elit. Donec euismod tempor elit a pulvinar. Integer vehicula purus ipsum, id ultricies risus placerat sit amet. Cras vel ante egestas diam egestas sagittis. Mauris facilisis, dolor pulvinar tempus vestibulum, elit lectus gravida sem, sed volutpat dui dolor vel purus. Praesent nec ligula ac mi faucibus hendrerit vitae sed felis. Nullam vehicula magna vitae ultrices dapibus. Pellentesque facilisis dui a diam scelerisque pharetra. Vestibulum dapibus imperdiet molestie. Fusce fringilla facilisis metus, in iaculis lectus fermentum eget. Ut tortor quam, imperdiet sit amet nisi in, fringilla porta sapien. Aenean a enim vestibulum, bibendum dolor sed, consequat mi.</p>
    <p>Fusce faucibus nulla id iaculis sagittis. Duis ac arcu a ex elementum feugiat. Proin ut quam quis tortor vulputate semper a id nunc. Morbi rhoncus ultricies ultricies. Praesent semper id massa sed euismod. Fusce sagittis felis nec libero malesuada, in luctus enim aliquam. Aliquam sagittis, orci eget blandit vestibulum, mi dui blandit mauris, et tincidunt tellus nisi sagittis lacus. Sed dignissim, sapien vitae cursus imperdiet, augue massa tempor ex, non finibus risus metus ac enim. Mauris blandit eros nisi.</p>
    <p>Sed bibendum ante ac metus hendrerit, nec commodo tortor venenatis. Pellentesque porta eros non eros cursus, vitae commodo sapien facilisis. Praesent sit amet volutpat lacus. Nullam sed quam ac dolor blandit lacinia. Ut euismod turpis sit amet libero pulvinar, non aliquet lacus bibendum. Nullam libero massa, facilisis sed neque id, porta fringilla eros. Curabitur vestibulum nisi nec tempor tempor. Sed fermentum mauris diam, eu volutpat magna tempus et. Ut semper dapibus purus eget ullamcorper. Aenean varius rutrum purus id congue. Mauris sit amet turpis ornare, pharetra ex et, porta lorem. In hac habitasse platea dictumst.</p>
    <p>Nulla sed pellentesque nibh, eu consectetur neque. Curabitur eu risus at felis sagittis blandit. Nunc non massa non massa mattis semper. Curabitur dapibus tortor velit, id tincidunt ligula rutrum sed. Quisque feugiat consequat molestie. Curabitur lobortis neque ac porta imperdiet. Sed malesuada nibh sit amet magna commodo, sed bibendum turpis vestibulum. Suspendisse vel rutrum dolor, sed bibendum turpis. Morbi condimentum fermentum urna id venenatis.</p>
  </div>
</div>

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