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Element UI中table單元格合併的解決過程

2022-08-25 14:00:51

引言

專案中遇到表格單元格合併的需求,在此記錄整個解決過程。

專案使用的是 Element UI,表格使用的是 table 元件。Element UI 的 table 表格元件中對單元格進行合併,需要使用 table 元件的 span-method 屬性。

先看一張成果圖(完整程式碼放在末尾):

解決思路:

1、格式化後臺返回的資料(根據實際資料格式處理)

專案後臺返回的資料格式為樹形結構,這裡做簡化展示:

[
  {
    'column1': '111',
    'column2': '222',
    'column3': '333',
    'children1': [
      {
        'column6': 666,
        'column4': '4440',
        'column5': '5550',
        'children2': [
          {
            'column7': '77701',
            'column8': '88801',
            'column9': '99901'
          }
        ]
      }
    ]
  }
]

需要先將樹結構資料轉為一維陣列:

// table 表格資料初始化處理,將樹結構資料轉為一維陣列
    handleData(data, parentId) {
      data.map((res, index) => {
        var obj = {
          id: parentId
        }
        for (const key in res) {
          const isarr = Object.values(res).find((age) => {
            return Array.isArray(age)
          })
          if (isarr) {
            if (Array.isArray(res[key])) {
              for (let i = 0; i < res[key].length; i++) {
                Object.assign(obj, res[key][i])
                data.push(obj)
                res[key].splice(i, 1)
                if (res[key].length === 0) {
                  data.splice(index, 1)
                }
                this.handleData(data, parentId)
              }
            } else {
              Object.assign(obj, { [key]: res[key] })
            }
          }
        }
      })
      return data
    }

因為後臺返回的資料裡沒有唯一識別符號,所以需要單獨新增一個唯一標識表示轉換為一維陣列的資料是出自同一組樹結構裡。故此處在展開時單獨加了一個 id 屬性,用來代替唯一標識。如果後臺返回的資料格式就是一個一維陣列,可跳過資料格式化步驟。

2、在 data 中定義資料,需要合併幾列就定義幾個陣列和索引

  data() {
    return {
      tableData: [],
      // 合併單元格
      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
      column5Arr: [], // column5
      column5Index: 0, // column5索引
      column6Arr: [], // column6
      column6Index: 0 // column6索引
    }
  }

3、定義合併函數

以第一行為基準,一層層對比,引數 data 就是格式化以後的表格資料,以每個資料裡的唯一標識 id 作為合併的參照欄位:

    // 初始化合並行陣列
    mergeInit() {
      this.column1Arr = [] // column1
      this.column1Index = 0 // column1索引
      this.column2Arr = [] // column2
      this.column2Index = 0 // column2索引
      this.column3Arr = [] // column3
      this.column3Index = 0 // column3索引
      this.column4Arr = [] // column4
      this.column4Index = 0 // column4索引
      this.column5Arr = [] // column5
      this.column5Index = 0 // column5索引
      this.column6Arr = [] // column6
      this.column6Index = 0 // column6索引
    },
    // 合併表格
    mergeTable(data) {
      this.mergeInit()
      if (data.length > 0) {
        for (var i = 0; i < data.length; i++) {
          if (i === 0) {
            // 第一行必須存在,以第一行為基準
            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
          } else {
            // 判斷當前元素與上一元素是否相同
            // column1
            if (
              data[i].column1 === data[i - 1].column1 &&
              data[i].id === data[i - 1].id
            ) {
              this.column1Arr[this.column1Index] += 1
              this.column1Arr.push(0)
            } else {
              this.column1Arr.push(1)
              this.column1Index = i
            }
 
            // column2
            if (
              data[i].column2 === data[i - 1].column2 &&
              data[i].id === data[i - 1].id
            ) {
              this.column2Arr[this.column2Index] += 1
              this.column2Arr.push(0)
            } else {
              this.column2Arr.push(1)
              this.column2Index = i
            }
 
            // column3
            if (
              data[i].column3 === data[i - 1].column3 &&
              data[i].id === data[i - 1].id
            ) {
              this.column3Arr[this.column3Index] += 1
              this.column3Arr.push(0)
            } else {
              this.column3Arr.push(1)
              this.column3Index = i
            }
 
            // column4
            if (
              data[i].column4 === data[i - 1].column4 &&
              data[i].id === data[i - 1].id
            ) {
              this.column4Arr[this.column4Index] += 1
              this.column4Arr.push(0)
            } else {
              this.column4Arr.push(1)
              this.column4Index = i
            }
 
            // column5
            if (
              data[i].column5 === data[i - 1].column5 &&
              data[i].column4 === data[i - 1].column4 &&
              data[i].id === data[i - 1].id
            ) {
              this.column5Arr[this.column5Index] += 1
              this.column5Arr.push(0)
            } else {
              this.column5Arr.push(1)
              this.column5Index = i
            }
 
            // column6
            if (
              data[i].column6 === data[i - 1].column6 &&
              data[i].column4 === data[i - 1].column4 &&
              data[i].id === data[i - 1].id
            ) {
              this.column6Arr[this.column6Index] += 1
              this.column6Arr.push(0)
            } else {
              this.column6Arr.push(1)
              this.column6Index = i
            }
          }
        }
      }
    },

注意,同一組資料裡可能會有多個  children1 或者 children2,這時合併的時候會有多個條件進行判斷:

4、table 元件屬性 span-method 的單元格合併方法:

    handleSpanMethod({ row, column, rowIndex, columnIndex }) {
      if (columnIndex === 0 || columnIndex === 1) {
        // 第一列 column1
        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) {
        // 第二列 column2
        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) {
        // 第三列 column3
        const _row_2 = this.column3Arr[rowIndex]
        const _col_2 = _row_2 > 0 ? 1 : 0
        return {
          rowspan: _row_2,
          colspan: _col_2
        }
      } else if (columnIndex === 4) {
        // 第四列 column4
        const _row_2 = this.column4Arr[rowIndex]
        const _col_2 = _row_2 > 0 ? 1 : 0
        return {
          rowspan: _row_2,
          colspan: _col_2
        }
      } else if (columnIndex === 5) {
        // 第五列 column5
        const _row_2 = this.column5Arr[rowIndex]
        const _col_2 = _row_2 > 0 ? 1 : 0
        return {
          rowspan: _row_2,
          colspan: _col_2
        }
      } else if (columnIndex === 6) {
        // 第六列 column6
        const _row_2 = this.column6Arr[rowIndex]
        const _col_2 = _row_2 > 0 ? 1 : 0
        return {
          rowspan: _row_2,
          colspan: _col_2
        }
      }
    }

至此,整個單元格合併就完成了!

如果覺得寫得還不錯,還請點贊支援,感謝感謝感謝!!!

完整程式碼:

<template>
  <div class="table-wrap">
    <el-table
      :data="tableData"
      :span-method="handleSpanMethod"
      :cell-style="{ background: '#FFFFFF' }"
      border
      style="width: 100%"
    >
      <el-table-column prop="id" label="序號" align="center" width="80">
        <template slot-scope="scope">
          {{ scope.row.id + 1 }}
        </template>
      </el-table-column>
      <el-table-column prop="column1" label="column1" align="center" />
      <el-table-column prop="column2" label="column2" align="center" />
      <el-table-column prop="column3" label="column3" align="center" />
      <el-table-column prop="column4" label="column4" align="center" />
      <el-table-column prop="column5" label="column5" align="center" />
      <el-table-column prop="column6" label="column6" align="center" />
      <el-table-column prop="column7" label="column7" align="center" />
      <el-table-column prop="column8" label="column8" align="center" />
      <el-table-column prop="column9" label="column9" align="center" />
    </el-table>
  </div>
</template>
 
<script>
export default {
  name: 'CellMerge',
  data() {
    return {
      tableData: [],
      // 合併單元格
      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
      column5Arr: [], // column5
      column5Index: 0, // column5索引
      column6Arr: [], // column6
      column6Index: 0 // column6索引
    }
  },
  mounted() {
    this.initTableData()
  },
  methods: {
    // 初始化表格資料
    initTableData() {
      const newTableData = [
        {
          'column1': '111',
          'column2': '222',
          'column3': '333',
          'children1': [
            {
              'column6': 666,
              'column4': '4440',
              'column5': '5550',
              'children2': [
                {
                  'column7': '77701',
                  'column8': '88801',
                  'column9': '99901'
                },
                {
                  'column7': '77702',
                  'column8': '88802',
                  'column9': '99902'
                },
                {
                  'column7': '77703',
                  'column8': '88803',
                  'column9': '99903'
                }
              ]
            },
            {
              'column6': 666,
              'column4': '4441',
              'column5': '5551',
              'children2': [
                {
                  'column7': '77711',
                  'column8': '88811',
                  'column9': '99911'
                }
              ]
            },
            {
              'column6': 666,
              'column4': '4442',
              'column5': '5552',
              'children2': [
                {
                  'column7': '77721',
                  'column8': '88821',
                  'column9': '99921'
                },
                {
                  'column7': '77722',
                  'column8': '88822',
                  'column9': '99922'
                }
              ]
            }
          ]
        },
        {
          'column1': '111',
          'column2': '222',
          'column3': '333',
          'children1': [
            {
              'column6': 666,
              'column4': '4440',
              'column5': '5550',
              'children2': [
                {
                  'column7': '77701',
                  'column8': '88801',
                  'column9': '99901'
                }
              ]
            },
            {
              'column6': 666,
              'column4': '4441',
              'column5': '5551',
              'children2': [
                {
                  'column7': '77711',
                  'column8': '88811',
                  'column9': '99911'
                },
                {
                  'column7': '77712',
                  'column8': '88812',
                  'column9': '99912'
                }
              ]
            }
          ]
        },
        {
          'column1': '111',
          'column2': '222',
          'column3': '333',
          'children1': [
            {
              'column6': 666,
              'column4': '4440',
              'column5': '5550',
              'children2': [
                {
                  'column7': '77701',
                  'column8': '88801',
                  'column9': '99901'
                },
                {
                  'column7': '77702',
                  'column8': '88802',
                  'column9': '99902'
                },
                {
                  'column7': '77703',
                  'column8': '88803',
                  'column9': '99903'
                }
              ]
            },
            {
              'column6': 666,
              'column4': '4441',
              'column5': '5551',
              'children2': [
                {
                  'column7': '77711',
                  'column8': '88811',
                  'column9': '99911'
                }
              ]
            }
          ]
        }
      ]
      this.tableData = []
      newTableData.map((res, index) => {
        const parentId = index
        this.tableData.push.apply(
          this.tableData,
          this.handleData([res], parentId)
        )
      })
      this.mergeTable(this.tableData)
    },
    // table 表格資料初始化處理,將樹結構資料轉為一維陣列
    handleData(data, parentId) {
      data.map((res, index) => {
        var obj = {
          id: parentId
        }
        for (const key in res) {
          const isarr = Object.values(res).find((age) => {
            return Array.isArray(age)
          })
          if (isarr) {
            if (Array.isArray(res[key])) {
              for (let i = 0; i < res[key].length; i++) {
                Object.assign(obj, res[key][i])
                data.push(obj)
                res[key].splice(i, 1)
                if (res[key].length === 0) {
                  data.splice(index, 1)
                }
                this.handleData(data, parentId)
              }
            } else {
              Object.assign(obj, { [key]: res[key] })
            }
          }
        }
      })
      return data
    },
    // 初始化合並行陣列
    mergeInit() {
      this.column1Arr = [] // column1
      this.column1Index = 0 // column1索引
      this.column2Arr = [] // column2
      this.column2Index = 0 // column2索引
      this.column3Arr = [] // column3
      this.column3Index = 0 // column3索引
      this.column4Arr = [] // column4
      this.column4Index = 0 // column4索引
      this.column5Arr = [] // column5
      this.column5Index = 0 // column5索引
      this.column6Arr = [] // column6
      this.column6Index = 0 // column6索引
    },
    // 合併表格
    mergeTable(data) {
      this.mergeInit()
      if (data.length > 0) {
        for (var i = 0; i < data.length; i++) {
          if (i === 0) {
            // 第一行必須存在,以第一行為基準
            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
          } else {
            // 判斷當前元素與上一元素是否相同
            // column1
            if (
              data[i].column1 === data[i - 1].column1 &&
              data[i].id === data[i - 1].id
            ) {
              this.column1Arr[this.column1Index] += 1
              this.column1Arr.push(0)
            } else {
              this.column1Arr.push(1)
              this.column1Index = i
            }
 
            // column2
            if (
              data[i].column2 === data[i - 1].column2 &&
              data[i].id === data[i - 1].id
            ) {
              this.column2Arr[this.column2Index] += 1
              this.column2Arr.push(0)
            } else {
              this.column2Arr.push(1)
              this.column2Index = i
            }
 
            // column3
            if (
              data[i].column3 === data[i - 1].column3 &&
              data[i].id === data[i - 1].id
            ) {
              this.column3Arr[this.column3Index] += 1
              this.column3Arr.push(0)
            } else {
              this.column3Arr.push(1)
              this.column3Index = i
            }
 
            // column4
            if (
              data[i].column4 === data[i - 1].column4 &&
              data[i].id === data[i - 1].id
            ) {
              this.column4Arr[this.column4Index] += 1
              this.column4Arr.push(0)
            } else {
              this.column4Arr.push(1)
              this.column4Index = i
            }
 
            // column5
            if (
              data[i].column5 === data[i - 1].column5 &&
              data[i].column4 === data[i - 1].column4 &&
              data[i].id === data[i - 1].id
            ) {
              this.column5Arr[this.column5Index] += 1
              this.column5Arr.push(0)
            } else {
              this.column5Arr.push(1)
              this.column5Index = i
            }
 
            // column6
            if (
              data[i].column6 === data[i - 1].column6 &&
              data[i].column4 === data[i - 1].column4 &&
              data[i].id === data[i - 1].id
            ) {
              this.column6Arr[this.column6Index] += 1
              this.column6Arr.push(0)
            } else {
              this.column6Arr.push(1)
              this.column6Index = i
            }
          }
        }
      }
    },
    handleSpanMethod({ row, column, rowIndex, columnIndex }) {
      if (columnIndex === 0 || columnIndex === 1) {
        // 第一列 column1
        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) {
        // 第二列 column2
        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) {
        // 第三列 column3
        const _row_2 = this.column3Arr[rowIndex]
        const _col_2 = _row_2 > 0 ? 1 : 0
        return {
          rowspan: _row_2,
          colspan: _col_2
        }
      } else if (columnIndex === 4) {
        // 第四列 column4
        const _row_2 = this.column4Arr[rowIndex]
        const _col_2 = _row_2 > 0 ? 1 : 0
        return {
          rowspan: _row_2,
          colspan: _col_2
        }
      } else if (columnIndex === 5) {
        // 第五列 column5
        const _row_2 = this.column5Arr[rowIndex]
        const _col_2 = _row_2 > 0 ? 1 : 0
        return {
          rowspan: _row_2,
          colspan: _col_2
        }
      } else if (columnIndex === 6) {
        // 第六列 column6
        const _row_2 = this.column6Arr[rowIndex]
        const _col_2 = _row_2 > 0 ? 1 : 0
        return {
          rowspan: _row_2,
          colspan: _col_2
        }
      }
    }
  }
}
</script>
<style lang="scss" scoped>
  .table-wrap {
    width: 100%;
    height: 100%;
    padding: 20px;
  }
</style>

總結

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