4dkankan-components/docs/examples-bk/table/summary.vue

<template>
    <el-table :data="tableData" border show-summary style="width: 100%">
        <el-table-column prop="id" label="ID" width="180" />
        <el-table-column prop="name" label="Name" />
        <el-table-column prop="amount1" sortable label="Amount 1" />
        <el-table-column prop="amount2" sortable label="Amount 2" />
        <el-table-column prop="amount3" sortable label="Amount 3" />
    </el-table>

    <el-table :data="tableData" border height="200" :summary-method="getSummaries" show-summary style="width: 100%; margin-top: 20px">
        <el-table-column prop="id" label="ID" width="180" />
        <el-table-column prop="name" label="Name" />
        <el-table-column prop="amount1" label="Cost 1 ($)" />
        <el-table-column prop="amount2" label="Cost 2 ($)" />
        <el-table-column prop="amount3" label="Cost 3 ($)" />
    </el-table>
</template>

<script lang="ts" setup>
import type { TableColumnCtx } from 'element-plus/es/components/table/src/table-column/defaults'

interface Product {
    id: string
    name: string
    amount1: string
    amount2: string
    amount3: number
}

interface SummaryMethodProps<T = Product> {
    columns: TableColumnCtx<T>[]
    data: T[]
}

const getSummaries = (param: SummaryMethodProps) => {
    const { columns, data } = param
    const sums: string[] = []
    columns.forEach((column, index) => {
        if (index === 0) {
            sums[index] = 'Total Cost'
            return
        }
        const values = data.map(item => Number(item[column.property]))
        if (!values.every(value => Number.isNaN(value))) {
            sums[index] = `$ ${values.reduce((prev, curr) => {
                const value = Number(curr)
                if (!Number.isNaN(value)) {
                    return prev + curr
                } else {
                    return prev
                }
            }, 0)}`
        } else {
            sums[index] = 'N/A'
        }
    })

    return sums
}

const tableData: Product[] = [
    {
        id: '12987122',
        name: 'Tom',
        amount1: '234',
        amount2: '3.2',
        amount3: 10,
    },
    {
        id: '12987123',
        name: 'Tom',
        amount1: '165',
        amount2: '4.43',
        amount3: 12,
    },
    {
        id: '12987124',
        name: 'Tom',
        amount1: '324',
        amount2: '1.9',
        amount3: 9,
    },
    {
        id: '12987125',
        name: 'Tom',
        amount1: '621',
        amount2: '2.2',
        amount3: 17,
    },
    {
        id: '12987126',
        name: 'Tom',
        amount1: '539',
        amount2: '4.1',
        amount3: 15,
    },
]
</script>