element-plus/docs/examples/table-v2/cross-hovering.vue

<template>
  <div style="height: 400px">
    <el-auto-resizer>
      <template #default="{ height, width }">
        <el-table-v2
          :columns="columns"
          :cell-props="cellProps"
          :class="kls"
          :data="data"
          :width="width"
          :height="height"
        />
      </template>
    </el-auto-resizer>
  </div>
</template>

<script lang="ts" setup>
import { ref } from 'vue'

const generateColumns = (length = 10, prefix = 'column-', props?: any) =>
  Array.from({ length }).map((_, columnIndex) => ({
    ...props,
    key: `${prefix}${columnIndex}`,
    dataKey: `${prefix}${columnIndex}`,
    title: `Column ${columnIndex}`,
    width: 150,
  }))

const generateData = (
  columns: ReturnType<typeof generateColumns>,
  length = 200,
  prefix = 'row-'
) =>
  Array.from({ length }).map((_, rowIndex) => {
    return columns.reduce(
      (rowData, column, columnIndex) => {
        rowData[column.dataKey] = `Row ${rowIndex} - Col ${columnIndex}`
        return rowData
      },
      {
        id: `${prefix}${rowIndex}`,
        parentId: null,
      }
    )
  })

const columns = generateColumns(10)
columns.unshift({
  key: 'column-n-1',
  width: 50,
  title: 'Row No.',
  cellRenderer: ({ rowIndex }) => `${rowIndex + 1}`,
  align: 'center',
})
const data = generateData(columns, 200)

const cellProps = ({ columnIndex }) => {
  const key = `hovering-col-${columnIndex}`
  return {
    ['data-key']: key,
    onMouseenter: () => {
      kls.value = key
    },
    onMouseleave: () => {
      kls.value = ''
    },
  }
}

const kls = ref<string>('')
</script>

<style>
.hovering-col-0 [data-key='hovering-col-0'],
.hovering-col-1 [data-key='hovering-col-1'],
.hovering-col-2 [data-key='hovering-col-2'],
.hovering-col-3 [data-key='hovering-col-3'],
.hovering-col-4 [data-key='hovering-col-4'],
.hovering-col-5 [data-key='hovering-col-5'],
.hovering-col-6 [data-key='hovering-col-6'],
.hovering-col-7 [data-key='hovering-col-7'],
.hovering-col-8 [data-key='hovering-col-8'],
.hovering-col-9 [data-key='hovering-col-9'],
.hovering-col-10 [data-key='hovering-col-10'] {
  background: var(--el-table-row-hover-bg-color);
}

[data-key='hovering-col-0'] {
  font-weight: bold;
  user-select: none;
  pointer-events: none;
}
</style>