背景大小:覆盖悬停缩放过渡 [英] Background-size: cover on hover zoom transition

问题描述

当用户悬停链接(div)带有图像背景时，我想制作缩放效果.

当我只想缩放背景而不是文本时，我不知道该怎么做！而且我找不到最好的方法.

这是一个代码(不能如我所愿):

.light_blue {显示:块；颜色:#fff;背景重复:不重复；-webkit-background-size: 封面；-moz-background-size: 封面；-o-background-size: 封面；背景尺寸:封面；背景位置:中心；宽度:100%；}a.light_blue:悬停{文字装饰:无；颜色:#fcb428；}div.wrap {高度:33%；宽度:33%；溢出:隐藏；位置:相对；}.裹 {-moz-transition:所有 .5 秒；-webkit-transition:所有 .8s；过渡:所有 .8 秒；背景位置:居中；}.wrap:悬停{-webkit-background-size: 120%;-moz-background-size: 120%;-o-背景尺寸:120%；背景尺寸:120%；}.bg_flat {位置:绝对；字体系列:档案窄"；背景:网址(http://hokejfan.pl/hokej2015/kluby/img/black_bg4.png)；背景大小:包含；底部:0px；填充:5px；}.bg_naglowek {文本转换:大写；字体大小:29px；}.bg_flat2 {位置:绝对；背景: url(../img/black_bg4.png);背景大小:包含；字体系列:档案窄"；底部:5px；宽度:-webkit-calc(100% - 10px);宽度:计算(100% - 10px)；填充:15px；}

<a href="#news" class="light_blue wrap" style="background-image: url('http://hokejfan.pl/hokej2015/kluby/static/images2/48b51db749e3d9d992a61d289bc3c535.jpg'); 高度:180;"><div class="bg_flat2"><b class="bg_naglowek">Hello World</b>
</a>

解决方案

如果将 background-size 属性设置为 cover，您将无法平滑地为其设置动画.但是你可以通过动画 transform 来伪造它.而且由于您只希望缩放图像，而不是内容，因此您需要一个专用于显示图像的子元素(在下面的示例中使用伪元素完成).

.wrap {宽度:33%；填充底部:20%；溢出:隐藏；位置:相对；过渡:所有 .8 秒；背景:网址(http://hokejfan.pl/hokej2015/kluby/static/images2/48b51db749e3d9d992a61d289bc3c535.jpg)；背景位置:居中；背景尺寸:封面；}.wrap::before {内容:"";位置:绝对；上:0；右:0；下:0；左:0；背景:继承；过渡:继承；}.wrap:hover::before {变换:比例(1.2)；}.内容 {位置:相对；}

<div class="content">内容</div>

I want to make zoom effect when user hover link (div) with image background.

I don't know how to do it when i want to zoom only background not text! And i cant find the best way.

Here is a code (doesn't work as i want):

.light_blue {
  display: block;
  color: #fff;
  background-repeat: no-repeat;
  -webkit-background-size: cover;
  -moz-background-size: cover;
  -o-background-size: cover;
  background-size: cover;
  background-position: center;
  width: 100%;
}
a.light_blue:hover {
  text-decoration: none;
  color: #fcb428;
}
div.wrap {
  height: 33%;
  width: 33%;
  overflow: hidden;
  position: relative;
}
.wrap {
  -moz-transition: all .5s;
  -webkit-transition: all .8s;
  transition: all .8s;
  background-position: center center;
}
.wrap:hover {
  -webkit-background-size: 120%;
  -moz-background-size: 120%;
  -o-background-size: 120%;
  background-size: 120%;
}
.bg_flat {
  position: absolute;
  font-family: "Archivo Narrow";
  background: url(http://hokejfan.pl/hokej2015/kluby/img/black_bg4.png);
  background-size: contain;
  bottom: 0px;
  padding: 5px;
}
.bg_naglowek {
  text-transform: uppercase;
  font-size: 29px;
}
.bg_flat2 {
  position: absolute;
  background: url(../img/black_bg4.png);
  background-size: contain;
  font-family: "Archivo Narrow";
  bottom: 5px;
  width: -webkit-calc(100% - 10px);
  width: calc(100% - 10px);
  padding: 15px;
}

<div class="col-sm-4" style="padding: 5px;">
  <a href="#news" class="light_blue wrap" style="background-image: url('http://hokejfan.pl/hokej2015/kluby/static/images2/48b51db749e3d9d992a61d289bc3c535.jpg'); height: 180px;">
    <div class="bg_flat2">
      <b class="bg_naglowek">Hello World</b>
    </div>
  </a>
</div>

解决方案

You can't smoothly animate the background-size property if it's set to cover. But you can fake it by animating transform instead. And since you only want the image scaled, not the contents, you'll need a child element dedicated to displaying the image (done with a pseudo-element in the example below).

.wrap {
  width: 33%;
  padding-bottom: 20%;
  overflow: hidden;
  position: relative;
  transition: all .8s;
  background: url(http://hokejfan.pl/hokej2015/kluby/static/images2/48b51db749e3d9d992a61d289bc3c535.jpg);
  background-position: center center;
  background-size: cover;
}

.wrap::before { 
  content:"";
  position:absolute; top:0;right:0;bottom:0;left:0;
  background:inherit;
  transition:inherit;
}
.wrap:hover::before { 
  transform: scale(1.2);
}

.content {
  position: relative;
}

<div class="wrap">
  <div class="content">Content</div>
</div>

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