The whole process of implementing the summary pop-up window with Vue+Element UI

//Outline pop-up window outlineDialog: false,
//Standard summary of the current row standSummary: [],
// Outline pop-up window position control outlineCard: {
    pageY: null,
    pageX: null,
    display: "none"
}

<!-- Project Overview -->
<div class="summary-div" v-show="outlineDialog" ref="box-cardDiv" :style="outlineStyle" @mouseleave="leave">
    <div class="summary-title">Project Summary</div>
    <ul class="summary-ul">
        <li class="summary-li"><span>Standard Name</span><span>Is it required?</span><span>Is it displayed?</span></li>
        <li v-for="(item, index) in standSummary" :key="index" class="summary-li"><span>{{item.inspectdetailName}}</span><span>{{item.isRequired ? 'Yes' : 'No'}}</span> <span>{{item.isDisplay ? 'Yes' : 'No'}}</span> </li>
    </ul>
</div>

<style lang="scss">
#box-cardDiv {
    position: absolute;
}

.summary-div {
    border: solid 1px #eee;
    background-color: #fff;
    border-radius: 4px;
    box-shadow: 0 2px 12px 0 rgba(0, 0, 0, .1);
    padding: 10px 10px 0 10px;
    width: 300px;
    position: absolute;
    font-size: 13px;
}

.summary-ul {
    list-style: none;
    padding-left: 0;
    max-height: 350px;
    overflow-x:hidden;
    overflow-y: auto;
}

.summary-li {
    margin: 10px 10px 15px 10px;
    width: 250px;
    text-overflow: ellipsis;
    overflow: hidden;
    /* white-space: nowrap; */
    display: flex;

    span {
        margin: auto;
        width: 55px;
    }
}

.summary-li:first-child span:not(:first-child) {
    margin-left: 40px;
}

.summary-li:not(:first-child) span:nth-child(1) {
    width: 90px;
}

.summary-li:not(:first-child) span:nth-child(2) {
    width: 50px;
    margin-left: 45px;
}

.summary-li:not(:first-child) span:nth-child(3) {
    margin-left: 60px;
}

.summary-title {
    color: #cccccc;
    margin-left: 10px;
}
</style>

<el-table-column label="Project Overview" align="center" width="500">
    <template slot="header">
        <span>Project Overview</span>
        <span class="vertical"></span>
    </template>
    <template slot-scope="scope">
        <div class="col-summmary-div">
            <span class="col-summmary-format"><span>{{scope.row.firstListItem}}</span></span>
            <span>&nbsp;{{scope.row.equInspectplanItemList.length}}&nbsp;items</span>
            <i class="el-icon-arrow-down" @mouseenter="checkStandSunmmary(scope.row)"></i>
        </div>
    </template>
</el-table-column>

computed: {
    outlineStyle() {
        let h = 45 * this.standSummary.length;
        let browser = document.body.clientHeight - 50;
        let pageY = this.outlineCard.pageY - 50;
        let pageX = this.outlineCard.pageX - 280;
        if (pageY + h > browser) {
            return `left: ${ pageX }px; top: ${ (pageY-h) }px; position: absolute; display: ${ this.outlineCard.display }`;
        } else {
            return `left: ${ pageX }px; top: ${ (pageY-60) }px; position: absolute; display: ${ this.outlineCard.display }`;
        }
    }
},

/**
 * Mouse leave standard summary */
leave() {
    this.outlineCard.display = "none";
    this.outlineDialog = false;
},

/**
 * Current row standard summary */
checkStandSunmmary(row) {
    this.outlineDialog = true;
    this.standSummary = row.equInspectplanItemList;
    this.outlineCard.pageY = window.event.clientY;
    this.outlineCard.pageX = window.event.clientX;
    this.outlineCard.display = null;
},