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src/components/EasyLoadimage/EasyLoadimage.vue
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<template>
<view class="easy-loadimage" :id="uid">
<image class="origin-img" :src="imageSrc?imageSrc:defaultImg" :mode="mode"
v-if="loadImg&&!isLoadError"
v-show="showImg"
:class="{'no-transition':!openTransition,'show-transition':showTransition&&openTransition}"
@load="handleImgLoad"
@error="handleImgError">
</image>
<view class="loadfail-img" v-else-if="isLoadError"></view>
<view :class="['loading-img',loadingMode]" v-show="!showImg&&!isLoadError"></view>
</view>
</template>
<script>
// 生成全局唯一id
function generateUUID() {
return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {
let r = Math.random()*16|0, v = c == 'x' ? r : (r&0x3|0x8);
return v.toString(16);
})
}
export default{
props:{
imageSrc:{
type: String,
},
mode:{
type: String,
},
scrollTop:{
type: Number,
},
loadingMode:{
type: String,
default:'looming-gray'
},
openTransition:{
type: Boolean,
default:true,
},
viewHeight:{
type:Number,
default() {
return uni.getSystemInfoSync().windowHeight;
}
}
},
watch:{
scrollTop(val){
this.onScroll(val)
}
},
data(){
return {
uid:'',
loadImg:false,
showImg:false,
isLoadError:false,
showTransition:false
}
},
methods:{
init(){
this.uid = 'uid-' + generateUUID();
this.$nextTick(this.onScroll)
},
handleImgLoad(e){
// console.log('success');
this.showImg = true;
// this.$nextTick(function(){
// this.showTransition = true
// })
setTimeout(()=>{
this.showTransition = true
},50)
},
handleImgError(e){
// console.log('fail');
this.isLoadError = true;
},
onScroll(scrollTop){
// 加载ing时才执行滚动监听判断是否可加载
if(this.loadImg || this.isLoadError) return;
const id = this.uid
const query = uni.createSelectorQuery().in(this);
query.select('#'+id).boundingClientRect(data => {
if(!data) return;
if(data.top - this.viewHeight<0){
this.loadImg = true;
}
}).exec()
},
},
mounted() {
this.init()
}
}
</script>
<style scoped>
/* 官方优化图片tips */
image{
will-change: transform
}
/* 渐变过渡效果处理 */
image.origin-img{
width: 100%;
height: 100%;
opacity: 0.3;
}
image.origin-img.show-transition{
transition: opacity 1.2s;
opacity: 1;
}
image.origin-img.no-transition{
opacity: 1;
}
/* 加载失败、加载中的占位图样式控制 */
.loadfail-img{
height: 100%;
background: url('~@/static/easy-loadimage/loadfail.png') no-repeat center;
background-size: 50%;
}
.loading-img{
height: 100%;
}
/* 转圈 */
.spin-circle{
background: url('~@/static/easy-loadimage/loading.gif') no-repeat center;
background-size: 100rpx;
}
/* 动态灰色若隐若现 */
.looming-gray{
animation: looming-gray 1s infinite linear;
background-color: #e3e3e3;
}
@keyframes looming-gray{
0% {background-color:#e3e3e3aa;}
50% {background-color:#e3e3e3;}
100% {background-color:#e3e3e3aa;}
}
/* 骨架屏1 */
.skeleton-1{
background-color: #e3e3e3;
background-image: linear-gradient(100deg, rgba(255, 255, 255, 0), rgba(255, 255, 255, 0.2) 50%, rgba(255, 255, 255, 0) 80%);
background-size: 100rpx 100%;
background-repeat: repeat-y;
background-position:0 0;
animation: skeleton-1 .6s infinite;
}
@keyframes skeleton-1 {
to {
background-position: 200% 0;
}
}
/* 骨架屏2 */
.skeleton-2{
background-image: linear-gradient(-90deg, #fefefe 0%, #e6e6e6 50%,#fefefe 100%);
background-size: 400% 400%;
background-position:0 0;
animation: skeleton-2 1.2s ease-in-out infinite;
}
@keyframes skeleton-2{
to {
background-position: -135% 0;
}
}
</style>
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