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id
      let 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0
      let 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id
      let 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0
      let 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>