vue elementui 动态表头、表头合并、合并行、合并列、行根据某字段内容一致的进行合并、表格列展开收起功能

效果图：

1、表头第1、2列合并

第一种写法（普通表头）：

<el-table
      ref="main"
      :data="tableData"
      border
      :header-cell-style="headerStyle"
      style="width: 100%;">
      <el-table-column align="center" width="40" label="年级" fixed prop="nj" />
      <el-table-column align="center" width="80" label="班级" fixed prop="bj" />
el-table>

methods: {
    headerStyle({ row, column, rowIndex, columnIndex }) {
      const comStyle = {
        backgroundColor: "#4095e5",
        color: "#fff",
        fontSize: "500",
      };
      if (rowIndex === 0) {
        row[0].colSpan = 0; // 将表头第一列和第二列合并，内容展示为第二列的内容
        row[1].colSpan = 2;
        if (columnIndex === 0) { // 将表头第一列隐藏
          return {
            display: "none",
            ...comStyle,
          };
        }
      }
      return comStyle;
    },
}

第2种写法（二级表头）：

<el-table
      ref="main"
      :data="tableData"
      border
      :header-cell-style="headerStyle"
      style="width: 100%;">

      <el-table-column align="center" label="班级" width="120">
        <el-table-column align="center" width="40" prop="nj" />
        <el-table-column align="center" width="80" prop="bj" />
      el-table-column>
el-table>

headerStyle({ row, column, rowIndex, columnIndex }) {
      const comStyle = {
        backgroundColor: "#4095e5",
        color: "#fff",
        fontSize: "500",
      };
      // 1.1 让第0行的第0列跨2行
      if (rowIndex === 0 && columnIndex === 0) {
        this.$nextTick(() => {
          document
            .getElementsByClassName(column.id)[0]
            .setAttribute("rowSpan", 2);
          return comStyle;
        });
      }
      // 1.2 被覆盖的进行隐藏
      if (rowIndex === 1 && (columnIndex == 0 || columnIndex == 1)) {
        return {
          display: "none",
          ...comStyle,
        };
      }
      return comStyle;
    },

2、行根据某字段内容一致的进行合并

给表格增加属性:span-method="spanMethod"

spanMethod({ row, column, rowIndex, columnIndex }) {
      // console.log('row', row, 'column', column, 'rowIndex', rowIndex, 'columnIndex', columnIndex);
      //定义需要合并的列字段，有哪些列需要合并，就自定义添加字段即可
      const fields = ['nj']
      // 当前行的数据
      const cellValue = row[column.property]
      if (rowIndex == 0) { // 实现表头下面第一行数据，第一列合计展示时2列合并
          if (columnIndex === 0) {
            return {rowspan: 1, colspan: 0} // 隐藏表头下面第一行的第一列
          }
          if (columnIndex === 1) {
            return {rowspan: 1, colspan: 2} // 将表头下面第一行的第一列和第二列合并
          }
        }

        // 判断只合并定义字段的列数据
        if (cellValue && fields.includes(column.property)) {
          const prevRow = this.tableData[rowIndex - 1] //上一行数据
          let nextRow = this.tableData[rowIndex + 1] //下一行数据
          // 当上一行的数据等于当前行数据时，当前行单元格隐藏
          if (prevRow && prevRow[column.property] === cellValue) {
            return { rowspan: 0, colspan: 0 }
          } else {
            // 反之，则循环判断若下一行数据等于当前行数据，则当前行开始进行合并单元格
            let countRowspan = 1 //用于合并计数多少单元格
            while (nextRow && nextRow[column.property] === cellValue) {
              nextRow = this.tableData[++countRowspan + rowIndex]
            }
            if (countRowspan > 1) {
              return { rowspan: countRowspan, colspan: 1 }
            }
          }
        }
    },

3、完整示例代码

<template>
  <div class="page-wrapper">
    <div class="search-wrapper">
      <el-row type="flex" justify="space-between">
        <div class="search-item width-31">
          <el-radio-group v-model="type">
            <el-radio :label="1">按班级汇总el-radio>
            <el-radio :label="2">按年级汇总el-radio>
          el-radio-group>
        div>
        <div class="search-item margin-right-0">
          <el-button size="mini" type="primary">查询el-button>
          <el-button size="mini" type="primary" plain>重置el-button>
          <el-button size="mini" type="primary" icon="el-icon-download" plain>导出el-button>
        div>
      el-row>
    div>
    <el-table
      ref="main"
      :data="tableData"
      border
      :header-cell-style="headerStyle"
      :span-method="spanMethod"
      style="width: 100%;">
      <template v-if="type === 1">
        <el-table-column align="center" width="40" label="年级" fixed prop="nj" />
        <el-table-column align="center" width="80" label="班级" fixed prop="bj" />
      template>
      <template v-if="type === 2">
        <el-table-column align="center" width="100" label="年级" fixed prop="type" />
      template>
      <el-table-column align="center" label="人数">
        <el-table-column align="center" label="男" prop="num1" />
        <el-table-column align="center" label="女" prop="money1" />
      el-table-column>
      <el-table-column align="center" width="160" prop="num2">
        <template slot="header">
          <div class="expand-header-wrapper">
            <span class="title">姓名span>
            <span class="btn" @click="showColumn('open1')">{{!open1 ? '+展开' : '-收起'}}span>
          div>
        template>
      el-table-column>
      <template v-if="open1">
        <el-table-column
          v-for="item in colunms1"
          :key="'姓名_' + item.name"
          :label="item.name"
          :label-class-name="'more-header'"
          align="center">
          <el-table-column
            v-for="citem in item.children"
            :key="'姓名_' + item.name + citem.name"
            :label="citem.name"
            :prop="citem.prop"
            :label-class-name="'more-header'"
            align="center"/>
        el-table-column>
      template>
      <el-table-column align="center" min-width="200" prop="num2">
        <template slot="header">
          <div class="expand-header-wrapper">
            <span class="title">地址span>
            <span class="btn" @click="showColumn('open2')">{{!open2 ? '+展开' : '-收起'}}span>
          div>
        template>
      el-table-column>
      <template v-if="open2">
        <el-table-column
          v-for="item in colunms2"
          :key="'地址_' + item.name"
          :label="item.name"
          :label-class-name="'more-header'"
          align="center">
          <el-table-column
            v-for="citem in item.children"
            :key="'地址_' + item.name + citem.name"
            :label="citem.name"
            :prop="citem.prop"
            :label-class-name="'more-header'"
            align="center"/>
        el-table-column>
      template>
      <el-table-column align="center" width="100" prop="num2">
        <template slot="header">
          <div class="expand-header-wrapper">
            <span class="title">排名span>
            <span class="btn" @click="showColumn('open3')">{{!open3 ? '+展开' : '-收起'}}span>
          div>
        template>
        <template>
          <el-table-column align="center" label="年排" prop="num6" />
          <el-table-column align="center" label="班排" prop="money6" />
        template>
      el-table-column>
      <template v-if="open3">
        <el-table-column
          v-for="item in colunms3"
          :key="'排名_' + item.name"
          :label="item.name"
          :label-class-name="'more-header'"
          align="center">
          <el-table-column
            v-for="citem in item.children"
            :key="'排名_' + item.name + citem.name"
            :label="citem.name"
            :prop="citem.prop"
            :label-class-name="'more-header'"
            align="center"/>
        el-table-column>
      template>
    el-table>
  div>
template>

<script>
export default {
  name: 'demo',
  data() {
    return {
      type: 1,
      tableData: [
        { nj: '合计', type: '合计', bj: '合计', num1: "1111", money1: "1111", num2: "1111", money2: "1111", sale: '111', num3: -2129, money3: "111", num4: "111", money4: "111", num5: "111", money5: "1111",},
        { nj: '初一', type: '初一', bj: "1班", num1: "1", money1: "1", num2: "1", money2: "1", sale: '1', num3: "1", money3: "1", num4: "1", money4: "1", num5: "1", money5: "1",},
        { nj: '初一', type: '初一', bj: "2班", num1: "1", money1: "1", num2: "1", money2: "1", sale: '1', num3: "1", money3: "1", num4: "1", money4: "1", num5: "1", money5: "1",},
        { nj: '初一', type: '初一', bj: "3班", num1: "1", money1: "1", num2: "1", money2: "1", sale: '1', num3: "1", money3: "1", num4: "1", money4: "1", num5: "1", money5: "1",},
        { nj: '初二', type: '初二', bj: "1班", num1: "1", money1: "1", num2: "1", money2: "1", sale: '1', num3: "1", money3: "1", num4: "1", money4: "1", num5: "1", money5: "1",},
        { nj: '初二', type: '初二', bj: "2班", num1: "1", money1: "1", num2: "1", money2: "1", sale: '1', num3: "1", money3: "1", num4: "1", money4: "1", num5: "1", money5: "1",},
        { nj: '初二', type: '初二', bj: "3班", num1: "1", money1: "1", num2: "1", money2: "1", sale: '1', num3: "1", money3: "1", num4: "1", money4: "1", num5: "1", money5: "1",},
        { nj: '初三', type: '初三', bj: "1班", num1: "1", money1: "1", num2: "1", money2: "1", sale: '1', num3: "1", money3: "1", num4: "1", money4: "1", num5: "1", money5: "1",},
        { nj: '初三', type: '初三', bj: "2班", num1: "1", money1: "1", num2: "1", money2: "1", sale: '1', num3: "1", money3: "1", num4: "1", money4: "1", num5: "1", money5: "1",},
        { nj: '初三', type: '初三', bj: "3班", num1: "1", money1: "1", num2: "1", money2: "1", sale: '1', num3: "1", money3: "1", num4: "1", money4: "1", num5: "1", money5: "1",},
        { nj: '高一', type: '高一', bj: "1班", num1: "1", money1: "1", num2: "1", money2: "1", sale: '1', num3: "1", money3: "1", num4: "1", money4: "1", num5: "1", money5: "1",},
        { nj: '高一', type: '高一', bj: "2班", num1: "1", money1: "1", num2: "1", money2: "1", sale: '1', num3: "1", money3: "1", num4: "1", money4: "1", num5: "1", money5: "1",},
        { nj: '高一', type: '高一', bj: "3班", num1: "1", money1: "1", num2: "1", money2: "1", sale: '1', num3: "1", money3: "1", num4: "1", money4: "1", num5: "1", money5: "1",},
        { nj: '高二', type: '高二', bj: "1班", num1: "1", money1: "1", num2: "1", money2: "1", sale: '1', num3: "1", money3: "1", num4: "1", money4: "1", num5: "1", money5: "1",},
        { nj: '高二', type: '高二', bj: "2班", num1: "1", money1: "1", num2: "1", money2: "1", sale: '1', num3: "1", money3: "1", num4: "1", money4: "1", num5: "1", money5: "1",},
        { nj: '高三', type: '高三', bj: "1班", num1: "1", money1: "1", num2: "1", money2: "1", sale: '1', num3: "1", money3: "1", num4: "1", money4: "1", num5: "1", money5: "1",},
      ],
      open1: false,
      open2: false,
      open3: true,
      colunms1: [
        {
          name: "外形",
          children: [
            { name: "身高", prop: "num3" },
            { name: "体重", prop: "money3" },
          ],
        },
        {
          name: "发型",
          children: [
            { name: "颜色", prop: "num4" },
            { name: "长短", prop: "money4" },
          ],
        },
      ],
      colunms2: [
        {
          name: "省市",
          children: [
            { name: "省份", prop: "num3" },
            { name: "城市", prop: "money3" },
          ],
        },
        {
          name: "区域",
          children: [
            { name: "区域", prop: "num4" },
            { name: "街道", prop: "money4" },
          ],
        },
        {
          name: "村委",
          children: [
            { name: "村落", prop: "money5" },
            { name: "门牌", prop: "money5" },
          ],
        },
        {
          name: "人员情况",
          children: [
            { name: "兄弟", prop: "money5" },
            { name: "姐妹", prop: "money5" },
          ],
        },
      ],
      colunms3: [
        {
          name: "主科",
          children: [
            { name: "语文", prop: "num3" },
            { name: "数学", prop: "money3" },
            { name: "英语", prop: "money3" },
          ],
        },
        {
          name: "其他文科学科",
          children: [
            { name: "历史", prop: "num4" },
            { name: "政治", prop: "money4" },
            { name: "地理", prop: "money4" },
          ],
        },
        {
          name: "其他理科学科",
          children: [
            { name: "物理", prop: "num4" },
            { name: "生物", prop: "money4" },
            { name: "化学", prop: "money4" },
          ],
        },
      ],
    }
  },
  created() {},
  methods: {
    /** 表头合并控制 */
    headerStyle({ row, column, rowIndex, columnIndex }) {
      const comStyle = {
        backgroundColor: "#4095e5",
        color: "#fff",
        fontSize: "500",
      };
      /*
        // 1.1 让第0行的第0列跨2行
        if (rowIndex === 0 && columnIndex === 0) {
          this.$nextTick(() => {
            document
              .getElementsByClassName(column.id)[0]
              .setAttribute("rowSpan", 2);
            return comStyle;
          });
        }
        // 1.2 被覆盖的进行隐藏
        if (rowIndex === 1 && (columnIndex == 0 || columnIndex == 1)) {
          return {
            display: "none",
            ...comStyle,
          };
        } */
      if (this.type === 1 && rowIndex === 0) {
        row[0].colSpan = 0; // 将表头第一列和第二列合并，内容展示为第二列的内容
        row[1].colSpan = 2;
        if (columnIndex === 0) { // 将表头第一列隐藏
          return {
            display: "none",
            ...comStyle,
          };
        }
      }
      return comStyle;
    },
    /** 合并行、列 */
    spanMethod({ row, column, rowIndex, columnIndex }) {
      // console.log('row', row, 'column', column, 'rowIndex', rowIndex, 'columnIndex', columnIndex);
      //定义需要合并的列字段，有哪些列需要合并，就自定义添加字段即可
      let fields = []
      if (this.type === 1) {
        fields.push('nj')
      } else {
        fields.push('type')
      }
      // 当前行的数据
      const cellValue = row[column.property]
      if (this.type === 1 && rowIndex == 0) {
          if (columnIndex === 0) {
            return {rowspan: 1, colspan: 0} // 隐藏表头下面第一行的第一列
          }
          if (columnIndex === 1) {
            return {rowspan: 1, colspan: 2} // 将表头下面第一行的第一列和第二列合并
          }
        }

        // 判断只合并定义字段的列数据
        if (cellValue && fields.includes(column.property)) {
          const prevRow = this.tableData[rowIndex - 1] //上一行数据
          let nextRow = this.tableData[rowIndex + 1] //下一行数据
          // 当上一行的数据等于当前行数据时，当前行单元格隐藏
          if (prevRow && prevRow[column.property] === cellValue) {
            return { rowspan: 0, colspan: 0 }
          } else {
            // 反之，则循环判断若下一行数据等于当前行数据，则当前行开始进行合并单元格
            let countRowspan = 1 //用于合并计数多少单元格
            while (nextRow && nextRow[column.property] === cellValue) {
              nextRow = this.tableData[++countRowspan + rowIndex]
            }
            if (countRowspan > 1) {
              return { rowspan: countRowspan, colspan: 1 }
            }
          }
        }
    },
    /** 展开列 */
    showColumn(key) {
      this[key] = !this[key]
      this.$nextTick(() => {
        // 由于elementui框架问题，展开列后表格高度变小，需要重新布局、渲染表格
        this.$refs.main.doLayout();
      })
    },
  }
}
</script>