el-table :span-method 合并单元格（2.0）

2024.11.23今天我学习了如何使用el-table组件的合并单元格方法，效果如下：

代码如下：

<template><div class="container"><el-table :data="table_data" :span-method="object_merge" border><el-table-column label="名称" prop="name" align="center"/><el-table-column label="单价" prop="price" align="center"/><el-table-column label="时间" prop="time" align="center"/></el-table></div>
</template>
<script>
export default {data() {return {table_data: [],//存放表格数据length_data: [],//存放相同数据的个数}},created() {this.get_list();},methods: {get_list() {let demo = [{ name: '苹果', price: 20, time: '07:00:00', id: 1 },{ name: '香蕉', price: 12, time: '08:00:00', id: 2 },{ name: '苹果', price: 23, time: '09:00:00', id: 1 },{ name: '西瓜', price: 30, time: '07:00:00', id: 3 },{ name: '苹果', price: 11, time: '19:00:00', id: 1 },{ name: '香蕉', price: 20, time: '10:00:00', id: 2 },];// 合并相同的idlet new_demo = demo.reduce((arr, cur) => {if (!arr[cur.id]) {arr[cur.id] = [];}arr[cur.id].push(cur);return arr;//注意返回}, {});this.table_data = Object.values(new_demo).flat();//数组扁平化，如[[1,2],3]变成一维数组[1，2，3]// 获取相同数据的长度，如果长度大于1，需要填充n-1个0let length_data = [];Object.values(new_demo).forEach(item => {length_data.push(item.length);if (item.length > 1) {length_data.push(...new Array(item.length - 1).fill(0));}})this.length_data = length_data;},// 合并数组object_merge({ row, column, rowIndex, columnIndex}) {if (columnIndex === 0) {//判断第一列const row_span = this.length_data[rowIndex];const col_span = row_span > 0 ? 1 : 0;return {rowspan: row_span,colspan: col_span}}}}
}
</script>

封装方法：

1.utils  el-table-span-method.js文件

// el-table合并单元格方法
// repeat_data_length 重复数据长度如[1,2,0,1,1,3,0,0];长度大于1需要填充n-1个0
export function el_table_merge_cell({row, column, rowIndex, columnIndex}, repeat_data_length) {if (columnIndex === 0) {//判断第一列const row_span = repeat_data_length[rowIndex];const col_span = row_span > 0 ? 1 : 0;return {rowspan: row_span,colspan: col_span}}
}

页面代码：

<template><div class="container"><el-table :data="table_data" :span-method="object_merge" border><el-table-column label="名称" prop="name" align="center"/><el-table-column label="单价" prop="price" align="center"/><el-table-column label="时间" prop="time" align="center"/></el-table></div>
</template>
<script>
import { el_table_merge_cell } from '@/utils/el-table-span-method'export default {data() {return {table_data: [],//存放表格数据length_data: [],//存放相同数据的个数}},created() {this.get_list();},methods: {get_list() {let demo = [{ name: '苹果', price: 20, time: '07:00:00', id: 1 },{ name: '香蕉', price: 12, time: '08:00:00', id: 2 },{ name: '苹果', price: 23, time: '09:00:00', id: 1 },{ name: '西瓜', price: 30, time: '07:00:00', id: 3 },{ name: '苹果', price: 11, time: '19:00:00', id: 1 },{ name: '香蕉', price: 20, time: '10:00:00', id: 2 },];// 合并相同的idlet new_demo = demo.reduce((arr, cur) => {if (!arr[cur.id]) {arr[cur.id] = [];}arr[cur.id].push(cur);return arr;//注意返回}, {});this.table_data = Object.values(new_demo).flat();//数组扁平化，如[[1,2],3]变成一维数组[1，2，3]// 获取相同数据的长度，如果长度大于1，需要填充n-1个0let length_data = [];Object.values(new_demo).forEach(item => {length_data.push(item.length);if (item.length > 1) {length_data.push(...new Array(item.length - 1).fill(0));}})this.length_data = length_data;},// 合并数组object_merge({ row, column, rowIndex, columnIndex }) {return el_table_merge_cell({ row, column, rowIndex, columnIndex }, this.length_data)}}
}
</script>