css3动画中的虚线边框动画

Question

我看到这篇文章http://tympanus.net/Tutorials/BorderAnimationSVG/

我想在我的WP博客中添加这个.这样每个新的post div都会在其边框上显示这个动画.但问题是它在SVG中.无论如何我可以在不使用SVG的情况下使这个动画工作,我也不想使用javascript.

让我们说代码是:

.go {
  width: 900px;
  height: 200px;
  border: 8px dashed;
}

<div class="go"></div>

Answer 1

使用CSS可以实现这一点,并且在使用多个背景并使用动画更改其位置时非常简单.

.border {
  height: 100px;
  width: 200px;
  background: linear-gradient(90deg, blue 50%, transparent 50%), linear-gradient(90deg, blue 50%, transparent 50%), linear-gradient(0deg, blue 50%, transparent 50%), linear-gradient(0deg, blue 50%, transparent 50%);
  background-repeat: repeat-x, repeat-x, repeat-y, repeat-y;
  background-size: 16px 4px, 16px 4px, 4px 16px, 4px 16px;
  background-position: 0px 0px, 212px 116px, 0px 116px, 216px 0px;
  padding: 10px;
  transition: background-position 2s;
}
.border:hover{
    background-position: 212px 0px, 0px 116px, 0px 0px, 216px 116px;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/prefixfree/1.0.7/prefixfree.min.js"></script>
<div class="border">Some text</div>

这是一个从页面加载开始连续移动边框的示例.

.border {
  height: 100px;
  width: 200px;
  background: linear-gradient(90deg, blue 50%, transparent 50%), linear-gradient(90deg, blue 50%, transparent 50%), linear-gradient(0deg, blue 50%, transparent 50%), linear-gradient(0deg, blue 50%, transparent 50%);
  background-repeat: repeat-x, repeat-x, repeat-y, repeat-y;
  background-size: 15px 4px, 15px 4px, 4px 15px, 4px 15px;
  background-position: 0px 0px, 200px 100px, 0px 100px, 200px 0px;
  padding: 10px;
  animation: border-dance 4s infinite linear;
}
@keyframes border-dance {
  0% {
    background-position: 0px 0px, 300px 116px, 0px 150px, 216px 0px;
  }
  100% {
    background-position: 300px 0px, 0px 116px, 0px 0px, 216px 150px;
  }
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/prefixfree/1.0.7/prefixfree.min.js"></script>
<div class="border">Some text</div>

归功于web-tiki,以帮助修复动画每个循环结束时最初出现的轻微失真.

Answer 2

根据哈利的回答

这可以使各种尺寸的所有形状动起来

div{
margin:10px;
}
.size1{
background:black;
width:100px;
height:100px;
}

.size2{
background:black;
width:300px;
height:100px;
}


.active-animatioon {
    background-image: linear-gradient(90deg, silver 50%, transparent 50%), linear-gradient(90deg, silver 50%, transparent 50%), linear-gradient(0deg, silver 50%, transparent 50%), linear-gradient(0deg, silver 50%, transparent 50%);
    background-repeat: repeat-x, repeat-x, repeat-y, repeat-y;
    background-size: 15px 2px, 15px 2px, 2px 15px, 2px 15px;
    background-position: left top, right bottom, left bottom, right   top;
    animation: border-dance 1s infinite linear;
  }
  @keyframes border-dance {
    0% {
      background-position: left top, right bottom, left bottom, right   top;
    }
    100% {
      background-position: left 15px top, right 15px bottom , left bottom 15px , right   top 15px;
    }
  }
}

<div class="size1 active-animatioon"></div>
<div class="size2 active-animatioon"></div>

Answer 3

使用纯CSS,您可以使用repeating-linear-gradient在背景上绘制点,设置transition和悬停移动背景.

示例css代码:

.animationBorder {
  display: block;
  position: relative;
  overflow: hidden;
  margin: 12px;
  width: 200px;
  height: 200px;
  color: black;
  font-size: 20px;
}
.animationBorder:hover .background {
  background-position: 100px 0;
}
.background, .content {
  position: absolute;
  bottom: 0;
  top: 0;
  left: 0;
  right: 0;
}
.background {
  transition: 1200ms;
  background-color: black;
  background-image: repeating-linear-gradient(45deg, transparent, transparent 10px, #ffffff 10px, #ffffff 20px);
  background-size: 30px;
}
.content {
  transition: 200ms;
  margin: 1px;
  line-height: 200px;
  text-align: center;
  background-color: white;
}

演示:

.animationBorder {
  display: block;
  position: relative;
  overflow: hidden;
  margin: 12px;
  width: 200px;
  height: 200px;
  color: black;
  font-size: 20px;
}
.animationBorder:hover .background {
  background-position: 100px 0;
}
.background, .content {
  position: absolute;
  bottom: 0;
  top: 0;
  left: 0;
  right: 0;
}
.background {
  transition: 1200ms;
  background-color: black;
  background-image: repeating-linear-gradient(45deg, transparent, transparent 10px, #ffffff 10px, #ffffff 20px);
  background-size: 30px;
}
.content {
  transition: 200ms;
  margin: 1px;
  line-height: 200px;
  text-align: center;
  background-color: white;
}

<span class="animationBorder">
  <div class="background"></div>
  <div class="content">My post</div>
</span>

Answer 4

此代码改编自@Harry编写的答案,经过修改以响应@dude发布的问题,该代码适用于任何宽度和高度的div.

.box
{
  position: absolute;
  left: 20px;
  top: 20px;
  width: 150px;
  height: 150px;
}

.dashed 
{
  background: 
    linear-gradient(90deg, blue 50%, transparent 50%),
    linear-gradient(0deg, blue 50%, transparent 50%),
    linear-gradient(90deg, blue 50%, transparent 50%),
    linear-gradient(0deg, blue 50%, transparent 50%);
  background-repeat: repeat-x, repeat-y, repeat-x, repeat-y;
  background-size: 15px 4px, 4px 15px, 15px 4px, 4px 15px;
  background-position: left top, right top, left bottom, left top;
  padding: 4px;
  animation: border-dance 4s infinite linear;
}
	
@keyframes border-dance 
{
  0%
  {
    background-position: left top, right top, right bottom, left bottom;
  }
  100% 
  {
    background-position: right top, right bottom, left bottom, left top;
  }
}

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<div class="box dashed"></div>

Answer 5

这是一种无需指定旋转边框所要元素大小的方法：

.rotating-border {
  width: max-content;
  background: linear-gradient(90deg, purple 50%, transparent 50%), linear-gradient(90deg, purple 50%, transparent 50%), linear-gradient(0deg, purple 50%, transparent 50%), linear-gradient(0deg, purple 50%, transparent 50%);
  background-repeat: repeat-x, repeat-x, repeat-y, repeat-y;
  background-size: 15px 4px, 15px 4px, 4px 15px, 4px 15px;
  padding: 10px;
  animation: border-dance 4s infinite linear;
}

@keyframes border-dance {
  0% {
    background-position: 0 0, 100% 100%, 0 100%, 100% 0;
  }
  100% {
    background-position: 100% 0, 0 100%, 0 0, 100% 100%;
  }
}

<div class="rotating-border">Hello World</div>

Answer 6

动画伪元素对我的圆形按钮效果更好：

.border {
    position: relative;
    border: 0;
    height: 4rem;
    width: 4rem;
    border-radius: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.border:before {
  content: " ";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  bottom: 0;
  border-radius: 100%;
  border: 2px dashed limegreen;
  animation: rotate 20s linear infinite;
}
  
@keyframes rotate {
  0% { transform: rotate(0deg) }
  100% { transform: rotate(360deg) }
}

<div class="border"> hello </div>