vue element ui 表格有相同数据合并单元格

先看效果

前提是你的数据是扁平的数据因为要根据上下数据是否一样才合并的 如果是子级数据需要改一下数据格式了

下面是数据的样式

tableData: [{
          id: '1',
          name: '王小虎',
          amount1: '165',
          amount2: '3.2',
          amount3: 10
        }, {
          id: '1',
          name: '王小虎',
          amount1: '162',
          amount2: '4.43',
          amount3: 12
        }, {
          id: '1',
          name: '王we虎',
          amount1: '621',
          amount2: '1.9',
          amount3: 9
        }, {
          id: '2',
          name: '王we虎',
          amount1: '621',
          amount2: '2.2',
          amount3: 17
        }, {
          id: '3',
          name: '王小虎',
          amount1: '621',
          amount2: '4.1',
          amount3: 15
        }],

合并单元格的重点属性就是 :summary-method="" 这个是关键

<el-table ref="tableRef" show-summary :summary-method="getSummaries" :span-method="handleSpanMethod"  :data="listData"  border style="width: 100%; margin-top: 5px">
      <el-table-column label="No." type="index" align="center" width="50"></el-table-column>
      <el-table-column prop="checkResult" label="Check result"> </el-table-column>
      <el-table-column prop="standardChineseName" label="Standard chinese name"> </el-table-column>
      <el-table-column prop="ingredientInciCtfaName" label="Ingredient INCI(CTFA) name"> </el-table-column>
      <el-table-column prop="RMInFormula" label="RM in formula(%)"> </el-table-column>
      <el-table-column prop="ingredientInRM" label="Ingredient in RM(%)"> </el-table-column>
      <el-table-column prop="ingredientInFormula" label="Ingredient in formula(%)"> </el-table-column>
      <el-table-column prop="purposeOfUse" label="Purpose of use"> </el-table-column>
      <el-table-column prop="templateUrl5" label="New RM" align="center" width="100"> </el-table-column>
    </el-table>

data() {
    return {
      listData: [],

      // 合并单元格
      column1Arr: [], // column1
      column1Index: 0, // column1索引

      column2Arr: [], // column2
      column2Index: 0, // column2索引

      column3Arr: [], // column3
      column3Index: 0, // column3索引

      column4Arr: [], // column4
      column4Index: 0, // column4索引

      column5Arr: [], // column5
      column5Index: 0, // column5索引

      column6Arr: [], // column6
      column6Index: 0, // column6索引

      column7Arr: [], // column7
      column7Index: 0, // column7索引
    }
  },

mergeTable(data) {
      if (data.length > 0) {
        for (var i = 0; i < data.length; i++) {
          if (i === 0) {
            // 第一行必须存在，以第一行为基准  合并的数量根据直接需求改
            this.column1Arr.push(1) // column1
            this.column1Index = 0
            this.column2Arr.push(1) // column2
            this.column2Index = 0

            this.column3Arr.push(1) // column3
            this.column3Index = 0

            this.column4Arr.push(1) // column4
            this.column4Index = 0

            this.column5Arr.push(1) // column5
            this.column5Index = 0

            this.column6Arr.push(1) // column6
            this.column6Index = 0

            this.column7Arr.push(1) // column7
            this.column7Index = 0
          } else {
            // 判断当前元素与上一元素是否相同   
            // 我是根据第一个数据合并后续才可以合并 
            //如果是 根据当前表格的前一列可以在每一个 column1++   后面添加上前一个表格的列            
            // 如果是只要相同就合并那就每个column 里面的条件直接当前列就可以了
    
            // column1
            if (data[i].checkResult === data[i - 1].checkResult) {
              this.column1Arr[this.column1Index] += 1
              this.column1Arr.push(0)
            } else {
              this.column1Arr.push(1)
              this.column1Index = i
            }

            // column2
              if (data[i].standardChineseName === data[i - 1].standardChineseName && data[i].checkResult === data[i - 1].checkResult) {
                this.column2Arr[this.column2Index] += 1
                this.column2Arr.push(0)
              } else {
                this.column2Arr.push(1)
                this.column2Index = i
              }

              // column3
              if (data[i].ingredientInciCtfaName === data[i - 1].ingredientInciCtfaName && data[i].checkResult === data[i - 1].checkResult) {
                this.column3Arr[this.column3Index] += 1
                this.column3Arr.push(0)
              } else {
                this.column3Arr.push(1)
                this.column3Index = i
              }

              // column4
              if (data[i].RMInFormula === data[i - 1].RMInFormula && data[i].checkResult === data[i - 1].checkResult) {
                this.column4Arr[this.column4Index] += 1
                this.column4Arr.push(0)
              } else {
                this.column4Arr.push(1)
                this.column4Index = i
              }

              // column5
              if (data[i].ingredientInRM === data[i - 1].ingredientInRM && data[i].checkResult === data[i - 1].checkResult) {
                this.column5Arr[this.column5Index] += 1
                this.column5Arr.push(0)
              } else {
                this.column5Arr.push(1)
                this.column5Index = i
              }

              // column6
              if (data[i].ingredientInFormula === data[i - 1].ingredientInFormula && data[i].checkResult === data[i - 1].checkResult) {
                this.column6Arr[this.column6Index] += 1
                this.column6Arr.push(0)
              } else {
                this.column6Arr.push(1)
                this.column6Index = i
              }

              // column7
              if (data[i].purposeOfUse === data[i - 1].purposeOfUse && data[i].checkResult === data[i - 1].checkResult) {
                this.column7Arr[this.column7Index] += 1
                this.column7Arr.push(0)
              } else {
                this.column7Arr.push(1)
                this.column7Index = i
              }
          }
        }
      }
    },
    
    //我这里是在表格的第二列开始合并因为第一列是 序号 不可以合并  从第一个开始合并就把 下表
    //改为0  columnIndex === 0
    handleSpanMethod({ rowIndex, columnIndex }) {
      if (columnIndex === 1) {
        // 第二列 column2
        const _row_1 = this.column1Arr[rowIndex]
        const _col_1 = _row_1 > 0 ? 1 : 0
        return {
          rowspan: _row_1,
          colspan: _col_1,
        }
      } 
      else if (columnIndex === 2) {
        // 第三列 column3
        const _row_2 = this.column2Arr[rowIndex]
        const _col_2 = _row_2 > 0 ? 1 : 0
        return {
          rowspan: _row_2,
          colspan: _col_2,
        }
      } else if (columnIndex === 3) {
        // 第四列 column4
        const _row_3 = this.column3Arr[rowIndex]
        const _col_3 = _row_3 > 0 ? 1 : 0
        return {
          rowspan: _row_3,
          colspan: _col_3,
        }
      } else if (columnIndex === 4) {
        // 第五列 column5
        const _row_4 = this.column4Arr[rowIndex]
        const _col_4 = _row_4 > 0 ? 1 : 0
        return {
          rowspan: _row_4,
          colspan: _col_4,
        }
      } else if (columnIndex === 5) {
        // 第六列 column6
        const _row_5 = this.column5Arr[rowIndex]
        const _col_5 = _row_5 > 0 ? 1 : 0
        return {
          rowspan: _row_5,
          colspan: _col_5,
        }
      } else if (columnIndex === 6) {
        // 第七列 column7
        const _row_6 = this.column6Arr[rowIndex]
        const _col_6 = _row_6 > 0 ? 1 : 0
        return {
          rowspan: _row_6,
          colspan: _col_6,
        }
      } else if (columnIndex === 7) {
        // 第八列 column8
        const _row_7 = this.column7Arr[rowIndex]
        const _col_7 = _row_7 > 0 ? 1 : 0
        return {
          rowspan: _row_7,
          colspan: _col_7,
        }
      }
    },

//调取接口获取数据
getList() {
      const prams = {
        taskId: this.taskId,
        formulaId: this.formulaId
      }
      this.$http({
        headers: {
          'Content-Type': 'application/json',
        },
        method: 'post',
        url: '/123123',
        data: prams,
      })
      .then(res=>{
        this.listData = res.data.records //给data变量赋值
        this.mergeTable(this.listData)//合并单元格传入数据
      })
      //清空之前的数据  不清空 表格数据就会乱套
      this.column1Arr = []
      this.column1Index = 0
      this.column2Arr = []
      this.column2Index = 0
      this.column3Arr = []
      this.column3Index = 0
      this.column4Arr = []
      this.column4Index = 0
      this.column5Arr = []
      this.column5Index = 0
      this.column6Arr = []
      this.column6Index = 0
      this.column7Arr = []
      this.column7Index = 0
    },

完整代码

<template>
  <div>
    <el-table ref="tableRef" show-summary :summary-method="getSummaries" :span-method="handleSpanMethod"  :data="listData"  border style="width: 100%; margin-top: 5px">
      <el-table-column label="No." type="index" align="center" width="50"></el-table-column>
      <el-table-column prop="checkResult" label="Check result"> </el-table-column>
      <el-table-column prop="standardChineseName" label="Standard chinese name"> </el-table-column>
      <el-table-column prop="ingredientInciCtfaName" label="Ingredient INCI(CTFA) name"> </el-table-column>
      <el-table-column prop="RMInFormula" label="RM in formula(%)"> </el-table-column>
      <el-table-column prop="ingredientInRM" label="Ingredient in RM(%)"> </el-table-column>
      <el-table-column prop="ingredientInFormula" label="Ingredient in formula(%)"> </el-table-column>
      <el-table-column prop="purposeOfUse" label="Purpose of use"> </el-table-column>
      <el-table-column prop="templateUrl5" label="New RM" align="center" width="100"> </el-table-column>
    </el-table>
  </div>
</template>
  
<script>
export default {
  components: {},
  data() {
    return {
      listData: [],

      // 合并单元格
      column1Arr: [], // column1
      column1Index: 0, // column1索引

      column2Arr: [], // column2
      column2Index: 0, // column2索引

      column3Arr: [], // column3
      column3Index: 0, // column3索引

      column4Arr: [], // column4
      column4Index: 0, // column4索引

      column5Arr: [], // column5
      column5Index: 0, // column5索引

      column6Arr: [], // column6
      column6Index: 0, // column6索引

      column7Arr: [], // column7
      column7Index: 0, // column7索引
    }
  },
  computed: {},
  created() {
    this.getList()
  },
  mounted() {
    
  },
  methods: {
    getList() {
      const prams = {
        taskId: this.taskId,
        formulaId: this.formulaId
      }
      this.$http({
        headers: {
          'Content-Type': 'application/json',
        },
        method: 'post',
        url: '/1123123123',
        data: prams,
      })
      .then(res=>{
        this.listData = res.data.records//给data中的变量赋值 把res.data.records换成自己
//的据接口 更改一下数据的字段 便可以直接使用了  
        this.mergeTable(this.listData)//合并单元格传入数据
      })
      //清空之前的数据
      this.column1Arr = []
      this.column1Index = 0
      this.column2Arr = []
      this.column2Index = 0
      this.column3Arr = []
      this.column3Index = 0
      this.column4Arr = []
      this.column4Index = 0
      this.column5Arr = []
      this.column5Index = 0
      this.column6Arr = []
      this.column6Index = 0
      this.column7Arr = []
      this.column7Index = 0
    },
    mergeTable(data) {
      if (data.length > 0) {
        for (var i = 0; i < data.length; i++) {
          if (i === 0) {
            // 第一行必须存在，以第一行为基准
            this.column1Arr.push(1) // column1
            this.column1Index = 0
            this.column2Arr.push(1) // column2
            this.column2Index = 0

            this.column3Arr.push(1) // column3
            this.column3Index = 0

            this.column4Arr.push(1) // column4
            this.column4Index = 0

            this.column5Arr.push(1) // column5
            this.column5Index = 0

            this.column6Arr.push(1) // column6
            this.column6Index = 0

            this.column7Arr.push(1) // column7
            this.column7Index = 0
          } else {
            // 判断当前元素与上一元素是否相同
            // column1
            if (data[i].checkResult === data[i - 1].checkResult) {
              this.column1Arr[this.column1Index] += 1
              this.column1Arr.push(0)
            } else {
              this.column1Arr.push(1)
              this.column1Index = i
            }

            // column2
              if (data[i].standardChineseName === data[i - 1].standardChineseName && data[i].checkResult === data[i - 1].checkResult) {
                this.column2Arr[this.column2Index] += 1
                this.column2Arr.push(0)
              } else {
                this.column2Arr.push(1)
                this.column2Index = i
              }

              // column3
              if (data[i].ingredientInciCtfaName === data[i - 1].ingredientInciCtfaName && data[i].checkResult === data[i - 1].checkResult) {
                this.column3Arr[this.column3Index] += 1
                this.column3Arr.push(0)
              } else {
                this.column3Arr.push(1)
                this.column3Index = i
              }

              // column4
              if (data[i].RMInFormula === data[i - 1].RMInFormula && data[i].checkResult === data[i - 1].checkResult) {
                this.column4Arr[this.column4Index] += 1
                this.column4Arr.push(0)
              } else {
                this.column4Arr.push(1)
                this.column4Index = i
              }

              // column5
              if (data[i].ingredientInRM === data[i - 1].ingredientInRM && data[i].checkResult === data[i - 1].checkResult) {
                this.column5Arr[this.column5Index] += 1
                this.column5Arr.push(0)
              } else {
                this.column5Arr.push(1)
                this.column5Index = i
              }

              // column6
              if (data[i].ingredientInFormula === data[i - 1].ingredientInFormula && data[i].checkResult === data[i - 1].checkResult) {
                this.column6Arr[this.column6Index] += 1
                this.column6Arr.push(0)
              } else {
                this.column6Arr.push(1)
                this.column6Index = i
              }

              // column7
              if (data[i].purposeOfUse === data[i - 1].purposeOfUse && data[i].checkResult === data[i - 1].checkResult) {
                this.column7Arr[this.column7Index] += 1
                this.column7Arr.push(0)
              } else {
                this.column7Arr.push(1)
                this.column7Index = i
              }
          }
        }
      }
    },

    handleSpanMethod({ rowIndex, columnIndex }) {
      if (columnIndex === 1) {
        // 第二列 column2
        const _row_1 = this.column1Arr[rowIndex]
        const _col_1 = _row_1 > 0 ? 1 : 0
        return {
          rowspan: _row_1,
          colspan: _col_1,
        }
      } 
      else if (columnIndex === 2) {
        // 第三列 column3
        const _row_2 = this.column2Arr[rowIndex]
        const _col_2 = _row_2 > 0 ? 1 : 0
        return {
          rowspan: _row_2,
          colspan: _col_2,
        }
      } else if (columnIndex === 3) {
        // 第四列 column4
        const _row_3 = this.column3Arr[rowIndex]
        const _col_3 = _row_3 > 0 ? 1 : 0
        return {
          rowspan: _row_3,
          colspan: _col_3,
        }
      } else if (columnIndex === 4) {
        // 第五列 column5
        const _row_4 = this.column4Arr[rowIndex]
        const _col_4 = _row_4 > 0 ? 1 : 0
        return {
          rowspan: _row_4,
          colspan: _col_4,
        }
      } else if (columnIndex === 5) {
        // 第六列 column6
        const _row_5 = this.column5Arr[rowIndex]
        const _col_5 = _row_5 > 0 ? 1 : 0
        return {
          rowspan: _row_5,
          colspan: _col_5,
        }
      } else if (columnIndex === 6) {
        // 第七列 column7
        const _row_6 = this.column6Arr[rowIndex]
        const _col_6 = _row_6 > 0 ? 1 : 0
        return {
          rowspan: _row_6,
          colspan: _col_6,
        }
      } else if (columnIndex === 7) {
        // 第八列 column8
        const _row_7 = this.column7Arr[rowIndex]
        const _col_7 = _row_7 > 0 ? 1 : 0
        return {
          rowspan: _row_7,
          colspan: _col_7,
        }
      }
    }
}
</script>