vue2项目中，在列表等需要循环渲染的地方，使用el-popover时，数据量大了以后，会造成页面卡顿。
解决方案：基于el-popver二次封装
<template>
<div class="my-popover-container">
<span ref="referenceRef" class="comp-reference" @click="triggerPop" @mouseenter="mouseEnter" @mouseleave="mouseLeave">
<slot name="referenceContent"></slot>
</span>
<el-popover
v-show="showPop"
ref="hasClosePopoverRef"
v-bind="$attrs"
:popper-class="`self-class-close-btn-popover ${popoverClassName}`"
trigger="manual"
:append-to-body="true"
:width="width"
:placement="placement"
:reference="reference"
@show="showPopover"
@after-leave="hide"
>
<div ref="popoverContentRef" class="popover-content">
<div v-if="title || showClose" class="content-top">
<span class="title">{{ title }}</span>
<i v-if="showClose" class="el-icon-close" @click="close"></i>
</div>
<div v-if="showAfterLoading ? show : true" class="content-center" :style="{ 'max-height': maxContentHeight, ...contentCenterStyle }">
<slot></slot>
</div>
</div>
</el-popover>
</div>
</template>
<script>
export default {
name: 'MyPopover',
props: {
width: {
type: [Number, String],
default: 150
},
placement: {
type: String,
default: 'top-start'
},
// 触发方式hover/click
trigger: {
type: String,
default: 'click'
},
title: {
type: String,
default: ''
},
// 内容最大高度, 超出滚动
maxContentHeight: {
type: String,
default: 'auto'
},
// 是否需要popover显示后再加载内容
showAfterLoading: {
type: Boolean,
default: false
},
// 是否显示关闭按钮
showClose: {
type: Boolean,
default: true
},
contentCenterStyle: {
type: Object,
default: () => {}
},
// 点击弹窗内容，是否关闭弹窗
isClickClose: {
type: Boolean,
default: false
},
// popper-class其他类名
popoverClassName: {
type: String,
default: ''
}
},
data() {
return {
show: false,
showPop: false,
reference: null,
timeOut: null
}
},
watch: {
showPop(val) {
this.$emit('show-pop', val)
if (!val) {
document.removeEventListener('click', this.handleDocumentClick, true)
document.removeEventListener('scroll', this.updatePopover, true)
document.removeEventListener('mousemove', this.handleDocumentMousemove, true)
}
}
},
beforeDestroy() {
document.removeEventListener('click', this.handleDocumentClick, true)
document.removeEventListener('scroll', this.updatePopover, true)
document.removeEventListener('mousemove', this.handleDocumentMousemove, true)
},
methods: {
mouseEnter() {
if (this.trigger !== 'hover') return
this.reference = this.$refs.referenceRef
this.showPop = true
this.$nextTick(() => {
document.addEventListener('scroll', this.updatePopover, true) // 解决popover不跟随触发元素滚动问题
this.$refs.hasClosePopoverRef.doShow()
this.$nextTick(() => {
this.$refs.hasClosePopoverRef.updatePopper()
})
})
},
mouseLeave() {
if (this.trigger !== 'hover') return
this.$nextTick(() => {
document.addEventListener('mousemove', this.handleDocumentMousemove, true)
})
},
triggerPop() {
if (this.trigger !== 'click') return
this.reference = this.$refs.referenceRef
// 类似el-select的展开收起效果，需要transition="el-zoom-in-top"
if (this.isClickClose) {
if (this.showPop) {
this.close()
return
}
}
this.showPop = true
this.$nextTick(() => {
document.addEventListener('click', this.handleDocumentClick, true)
document.addEventListener('scroll', this.updatePopover, true) // 解决popover不跟随触发元素滚动问题
this.$refs.hasClosePopoverRef.doShow()
this.$nextTick(() => {
this.$refs.hasClosePopoverRef.updatePopper()
})
})
},
close() {
this.$refs?.hasClosePopoverRef?.doClose()
this.showPop = false
},
showPopover() {
this.show = true
this.$nextTick(() => {
this.$refs.hasClosePopoverRef.updatePopper()
})
},
hide() {
this.show = false
},
handleDocumentClick(e) {
if (!this.isClickClose) {
if (!this.$refs.popoverContentRef.contains(e.target)) {
this.close()
}
} else {
if (!this.$refs.referenceRef.contains(e.target)) {
this.close()
}
}
},
handleDocumentMousemove(e) {
clearTimeout(this.timeOut)
this.timeOut = setTimeout(() => {
if (!this.$refs?.hasClosePopoverRef?.$refs?.popper.contains(e.target) && !this.$refs.referenceRef.contains(e.target)) {
this.close()
}
}, 20)
},
updatePopover() {
this.$refs.hasClosePopoverRef && this.$refs.hasClosePopoverRef.updatePopper()
}
}
}
</script>
<style lang="scss" scoped>
.my-popover-container {
display: inline-block;
line-height: 0;
.comp-reference {
display: inline-block;
line-height: 0;
}
}
</style>
<style lang="scss">
.self-class-close-btn-popover {
min-width: 100px;
padding: 0;
font-family: PingFangSC, PingFang SC;
&.popover-out-container {
box-shadow: 0px 3px 14px 6px rgba(0, 0, 0, 0.05), 0px 8px 10px 1px rgba(0, 0, 0, 0.06), 0px 5px 5px -3px rgba(0, 0, 0, 0.1);
border-radius: 4px;
border: 1px solid #dcdcdc;
&.el-popper[x-placement^='bottom'] {
margin-top: 8px;
}
}
&.not-arrow-b-mt4 {
&.el-popper[x-placement^='bottom'] {
margin-top: 4px;
}
}
.popover-content {
.content-top {
display: flex;
height: 51px;
padding: 0 16px;
justify-content: space-between;
align-items: center;
border-bottom: 1px solid #f2f3f5;
.title {
font-weight: 500;
font-size: 14px;
color: #333333;
line-height: 22px;
}
.el-icon-close {
font-size: 16px;
color: #666666;
cursor: pointer;
&:hover {
color: #db9130;
}
}
}
.content-center {
margin: 16px 0;
padding: 0 16px;
overflow-y: auto;
}
}
}
</style>组件使用
<my-popover
width="240"
placement="bottom-start"
popover-class-name="popover-out-container"
transition="el-zoom-in-top"
:show-close="false"
:is-click-close="true"
:content-center-style="{ margin: '4px 0', padding: 0 }"
@show-pop="cutFlowShow"
>
<div>这里是内容</div>
<span slot="referenceContent">触发</span>
</my-popover>标签：el,default,type,refs,popover,document,true,加载 From： https://www.cnblogs.com/hong1/p/18469330