最近做了个手机端pdf预览的功能，用到pdf.js这个库，效果还不错。但是在网络差、文件大时，页面一直空白，体验不是很好。
于是加了个loading动画。
<div id="loadingContainer">
<div class="spinner">
<div class="spinner-container container1">
<div class="circle1"></div>
<div class="circle2"></div>
<div class="circle3"></div>
<div class="circle4"></div>
</div>
<div class="spinner-container container2">
<div class="circle1"></div>
<div class="circle2"></div>
<div class="circle3"></div>
<div class="circle4"></div>
</div>
<div class="spinner-container container3">
<div class="circle1"></div>
<div class="circle2"></div>
<div class="circle3"></div>
<div class="circle4"></div>
</div>
</div>
</div>
html
#loadingContainer {
width: 100%;
height: 100%;
display: flex;
align-items: center;
flex:;
z-index:;
.spinner {
margin: 100px auto;
width: 20px;
height: 20px;
position: relative;
.container1>div,
.container2>div,
.container3>div {
width: 6px;
height: 6px;
background-color: #fff;
border-radius: 100%;
position: absolute;
-webkit-animation: bouncedelay 1.2s infinite ease-in-out;
animation: bouncedelay 1.2s infinite ease-in-out;
-webkit-animation-fill-mode: both;
animation-fill-mode: both;
}
.spinner-container {
position: absolute;
width: 100%;
height: 100%;
}
.container2 {
-webkit-transform: rotateZ(45deg);
transform: rotateZ(45deg);
}
.container3 {
-webkit-transform: rotateZ(90deg);
transform: rotateZ(90deg);
}
.circle1 {
top:;
left:;
}
.circle2 {
top:;
right:;
}
.circle3 {
right:;
bottom:;
}
.circle4 {
left:;
bottom:;
}
.container2 .circle1 {
-webkit-animation-delay: -1.1s;
animation-delay: -1.1s;
}
.container3 .circle1 {
-webkit-animation-delay: -1.0s;
animation-delay: -1.0s;
}
.container1 .circle2 {
-webkit-animation-delay: -0.9s;
animation-delay: -0.9s;
}
.container2 .circle2 {
-webkit-animation-delay: -0.8s;
animation-delay: -0.8s;
}
.container3 .circle2 {
-webkit-animation-delay: -0.7s;
animation-delay: -0.7s;
}
.container1 .circle3 {
-webkit-animation-delay: -0.6s;
animation-delay: -0.6s;
}
.container2 .circle3 {
-webkit-animation-delay: -0.5s;
animation-delay: -0.5s;
}
.container3 .circle3 {
-webkit-animation-delay: -0.4s;
animation-delay: -0.4s;
}
.container1 .circle4 {
-webkit-animation-delay: -0.3s;
animation-delay: -0.3s;
}
.container2 .circle4 {
-webkit-animation-delay: -0.2s;
animation-delay: -0.2s;
}
.container3 .circle4 {
-webkit-animation-delay: -0.1s;
animation-delay: -0.1s;
}
}
}
@-webkit-keyframes bouncedelay {
0%,
80%,
100% {
-webkit-transform: scale(0.0)
}
40% {
-webkit-transform: scale(1.0)
}
}
@keyframes bouncedelay {
0%,
80%,
100% {
transform: scale(0.0);
-webkit-transform: scale(0.0);
}
40% {
transform: scale(1.0);
-webkit-transform: scale(1.0);
}
}
scss
本以为加个DOMContentLoaded事件监视移除动画就OK了。too young too simple
DOMContentLoaded完成时，pdf文件还没下载完成。看来用错了地方。查了下api后，定位到viewer.js 行号6029
如下就是pdf加载完成回调（不同版本可能略有不同）
loadingTask.onUnsupportedFeature = this.fallback.bind(this);
return loadingTask.promise.then(function getDocumentCallback(pdfDocument) {
self.load(pdfDocument, scale);
}, function getDocumentError(exception) {
source
修改后
loadingTask.onUnsupportedFeature = this.fallback.bind(this);
return loadingTask.promise.then(function getDocumentCallback(pdfDocument) {
self.load(pdfDocument, scale);
var loading = document.getElementById('loadingContainer');
loading && loading.remove();
}, function getDocumentError(exception) {
target