我在这里关注本教程:https://cloudcannon.com/deconstructions/2014/11/15/facebook-content-placeholder-deconstruction.html
创建一个虚拟加载器。不幸的是,本教程包含固定的像素值,我希望它能在各种尺寸的屏幕上工作。所以我调整了这样的动画:
@keyframes placeHolderShimmer {
0% {
background-position: -30vw 0
}
100% {
background-position: 30vw 0
}
}
.c-animated-background {
animation-duration: 1.5s;
animation-fill-mode: forwards;
animation-iteration-count: infinite;
animation-name: placeHolderShimmer;
animation-timing-function: linear;
background: fff;
background: linear-gradient(to right, #eeeeee 8%, #dddddd 18%, #eeeeee 33%);
height: 100%;
width: 100%;
position: relative;
padding-top: 50px;
-webkit-backface-visibility: hidden
}

<!DOCTYPE html>
<html>
<head>
<link rel="stylesheet" href="style.css">
<script src="script.js"></script>
</head>
<body class="c-animated-background">
</body>
</html>
&#13;
不幸的是,在动画结束后1.5秒,灰色区域向前或向后跳跃,具体取决于我设置的关键帧 - 背景位置值。如何防止这种情况并使过渡顺利进行?此外,动画似乎比我想象的更强烈 - 当我想用我的macbook 2016&#39;在chrome中检查开发模式中的背景元素时,它会挂起大约15秒。我应该使用转换/转换动画吗?
这是一个掠夺者:https://plnkr.co/edit/X8PBIUYmAC11LCUV9uTy?p=preview
答案 0 :(得分:4)
请检查更新后的答案,希望对您有所帮助。目前我认为没有必要移动身体。但是你可以在里面定义一个除法,并使它与身体相对。
当以负值定义时,大众运作不佳。请查看更新的答案
@keyframes placeHolderShimmer {
0% {
background-position: 0px 0;
}
100% {
background-position: 100em 0;
}
}
.c-animated-background {
animation-duration: 3s;
animation-fill-mode: forwards;
animation-iteration-count: infinite;
animation-name: placeHolderShimmer;
animation-timing-function: linear;
background: fff;
background: linear-gradient(to right, #eeeeee 8%, #dddddd 18%, #eeeeee 33%);
height: 100%;
width: 100%;
position: absolute;
padding-top: 50px;
-webkit-backface-visibility: hidden;
left:0;
right:0;
top:0;
bottom:0;
}
&#13;
<!DOCTYPE html>
<html>
<head>
<link rel="stylesheet" href="style.css">
<script src="script.js"></script>
</head>
<body>
<div class="c-animated-background">
</div>
</body>
</html>
&#13;
答案 1 :(得分:3)
持续时间没有问题。在这里你开始使用-30vh,以70vh(100-30)结束,就像平滑过渡一样简单。请查看下面的代码段以供参考。
@keyframes placeHolderShimmer {
0% {
background-position: -30vw 0
}
100% {
background-position: 70vw 0
}
}
.c-animated-background {
animation-duration: 1.5s;
animation-fill-mode: forwards;
animation-iteration-count: infinite;
animation-name: placeHolderShimmer;
animation-timing-function: linear;
background: fff;
background: linear-gradient(to right, #eeeeee 8%, #dddddd 18%, #eeeeee 33%);
height: 100%;
width: 100%;
position: relative;
padding-top: 50px;
-webkit-backface-visibility: hidden
}
&#13;
<!DOCTYPE html>
<html>
<head>
<link rel="stylesheet" href="style.css">
<script src="script.js"></script>
</head>
<body class="c-animated-background">
</body>
</html>
&#13;
答案 2 :(得分:2)
1.5秒后,动画将从0开始。这就是它闪烁的原因。
这适用于jsfiddle:
0% {
background-position: -30vw 0
}
100% {
background-position: 70vw 0
}
请参阅JSFiddle以使其更加清晰。这取决于屏幕的宽度。
古德勒克,
Fabian#Web-Stars
答案 3 :(得分:1)
试试这段代码。
我所做的是将关键帧值转换为从 - 到对,因为您只有2个阈值,并且不需要使用%值。
其次,我给了宽度&amp;根据视口使用视口单元的高度值。
如果有任何问题在下面发表评论。
@keyframes placeHolderShimmer {
from {
background-position: -468px 0
}
to {
background-position: 468px 0
}
}
.animated-background {
animation-duration: 1s;
animation-fill-mode: forwards;
animation-iteration-count: infinite;
animation-name: placeHolderShimmer;
animation-timing-function: linear;
background: #f6f7f8;
background: linear-gradient(to right, #eeeeee 8%, #dddddd 18%, #eeeeee 33%);
background-size: 800px 104px;
width: 100vw;
height: 100vh;
position: relative;
}
&#13;
<!DOCTYPE html>
<html>
<head>
<link rel="stylesheet" href="style.css">
<script src="script.js"></script>
</head>
<body>
<div class="animated-background"></div>
</body>
</html>
&#13;
答案 4 :(得分:0)
测试此:
@keyframes placeHolderShimmer{
0% {
background-position: -50vw 0
}
100% {
background-position: 50vw 0
}
}