element+vue实现表格跨行

    在项目开发中表格的使用还是很频繁的，而其中难免会涉及到表格的跨行跨列行为。这是一次记使用element-ui的table组件加vue实现的表格跨行跨列实践。

   首先是查看element的table组件的api：

<template>
  <div>
    <el-table
      :data="tableData6"
      :span-method="objectSpanMethod"
      border
      style="width: 100%; margin-top: 20px">
      <el-table-column
        prop="id"
        label="ID"
        width="180">
      </el-table-column>
      <el-table-column
        prop="name"
        label="姓名">
      </el-table-column>
      <el-table-column
        prop="amount1"
        label="数值 1（元）">
      </el-table-column>
      <el-table-column
        prop="amount2"
        label="数值 2（元）">
      </el-table-column>
      <el-table-column
        prop="amount3"
        label="数值 3（元）">
      </el-table-column>
    </el-table>
  </div>
</template>

<script>
  export default {
    data() {
      return {
        tableData6: [{
          id: '12987122',
          name: '王小虎',
          amount1: '234',
          amount2: '3.2',
          amount3: 10
        }, {
          id: '12987123',
          name: '王小虎',
          amount1: '165',
          amount2: '4.43',
          amount3: 12
        }, {
          id: '12987124',
          name: '王小虎',
          amount1: '324',
          amount2: '1.9',
          amount3: 9
        }, {
          id: '12987125',
          name: '王小虎',
          amount1: '621',
          amount2: '2.2',
          amount3: 17
        }, {
          id: '12987126',
          name: '王小虎',
          amount1: '539',
          amount2: '4.1',
          amount3: 15
        }]
      };
    },
    methods: {
      objectSpanMethod({ row, column, rowIndex, columnIndex }) {
        if (columnIndex === 0) {  // 开始合并的列的下标
          if (rowIndex % 2 === 0) {  // 满足此条件行占2行，列占1列
            return {
              rowspan: 2,
              colspan: 1
            };
          } else {  // 此处注意不满足以上条件的行列均占0，即从表格中删除其占位
            return {
              rowspan: 0,
              colspan: 0
            };
          }
        }
      }
    }
  };
</script>

以上为规则的偶数行合并，但是在我们的实际工作，往往需要实现的是合并某字段的同值得行或列，因此使用了如下方式实现：

代码如下：

<template>
  <div>
    <el-table :data="originData"
              :span-method="mergeStratege"
              border
              style="width: 100%">
      <el-table-column prop="name"
                       label="姓名"></el-table-column>
      <el-table-column prop="amount1"
                       label="数值1"></el-table-column>
      <el-table-column prop="amount2"
                       label="数值2"></el-table-column>
      <el-table-column prop="rowspan"
                       label="跨行"></el-table-column>
    </el-table>
  </div>
</template>
<script>
export default {
  data () {
    return {
      originData: [{
        id: '12987122',
        name: '王小虎',
        amount1: '234',
        amount2: '3.2',
        amount3: 10
      }, {
        id: '12987123',
        name: '王小虎',
        amount1: '165',
        amount2: '4.43',
        amount3: 12
      }, {
        id: '12987124',
        name: '王小虎',
        amount1: '324',
        amount2: '1.9',
        amount3: 9
      }, {
        id: '12987125',
        name: '张小豹',
        amount1: '621',
        amount2: '2.2',
        amount3: 17
      }, {
        id: '12987126',
        name: '张小豹',
        amount1: '539',
        amount2: '4.1',
        amount3: 15
      }, {
        id: '12987124',
        name: '赵小狮',
        amount1: '324',
        amount2: '1.9',
        amount3: 9
      }, {
        id: '12987125',
        name: '赵小狮',
        amount1: '621',
        amount2: '2.2',
        amount3: 17
      }, {
        id: '12987124',
        name: '赵小狮',
        amount1: '324',
        amount2: '1.9',
        amount3: 9
      }, {
        id: '12987124',
        name: '孙小马',
        amount1: '324',
        amount2: '1.9',
        amount3: 9
      }]
    }
  },
  watch: {
    originData: {
      handler (newData) {
        if (newData.length) {
          let mergeStartRow = newData[0]
          mergeStartRow.isStartMerge = true
          mergeStartRow.rowspan = 1
          mergeStartRow.startIndex = 0
          for (let i = 1; i <= newData.length; i++) {
            if ((newData[i] && 
                 mergeStartRow.name !== newData[i].name) || 
                 i === newData.length) {
              mergeStartRow.endIndex = i
              mergeStartRow.rowspan = mergeStartRow.endIndex - mergeStartRow.startIndex
              mergeStartRow = newData[i]
              if (mergeStartRow) {
                mergeStartRow.isStartMerge = true
                mergeStartRow.rowspan = 1
                mergeStartRow.startIndex = i
              }
            }
          }
        }
      },
      immediate: true
    }
  },
  methods: {
    mergeStratege ({ row, column, rowIndex, columnIndex }) {
      if (columnIndex === 0) {
        if (row.isStartMerge) {
          return {
            rowspan: row.rowspan,
            colspan: 1
          }
        } else {
          return {
            rowspan: 0,
            colspan: 0
          }
        }
      }
    }
  }

}
</script>

<style scoped>
</style>

以上为记录此次element table组件的使用