vue项目- el-table表格合并行

1.再页面中表格加上行方法

<el-table

:span-method="objectSpanMethod"

</el-table>

2，定义2个变量

  spanArr: [], //存储合并单元格的开始位置
      colFields: [
        'itemCode',
        'itemDesc',
        'purchaseApplyNo',
        'purchaseApplyLinenum',
        'purchaseOrderNo',
        'purchaseOrderLinenum',
        'purchaseMode',
        'purchaseMethod',
        'materielSection',
        'materielNo',
        'materielDesc',
        'num',
        'unit',
        'supplierName',
        'technologyId',
        'biddingPlanNo',
        'biddingBatch',
        'outbidDate',
        'frameworkAgreementNo',
        'eCommerceNo',
        'applyUser',
        'applyDate',
        'purchaseTime',
        'plannedDeliveryTime',
        'outbid',
        'contractNo',
        'orderTotalNetPrice',
        'orderTaxInclusivePrice',
        'orderDate',
        'handOverNum',
        'handOverDate',
        'checkNum',
        'checkDate',
        'wbsNo',
        'wbsDesc',
      ],

3. 由于我的表格只需要固定编码和名字，针对这2个字段的判断处理

   getSpanArr() {
   for (let i = 0; i < this.tableData.length; i++) {
   let row = i;
   // let col = i % this.colCount;
   if (row === 0) {
   // i 表示行 j表示列
   for (let j = 0; j < this.colFields.length; j++) {
   this.spanArr[i * this.colFields.length + j] = {
   rowspan: 1,
   colspan: 1,
   };
   }
   } else {
   for (let j = 0; j < this.colFields.length; j++) {
   // 当前和上一次的一样
   // 合并所有列的相同数据单元格
   if (
   this.colFields[j] == 'itemCode' ||
   this.colFields[j] == 'itemDesc'
   ) {
   // 指定合并哪些列
   if (
   this.tableData[row]['itemCode'] !==
   this.tableData[row - 1]['itemCode'] ||
   this.tableData[row]['itemDesc'] !==
   this.tableData[row - 1]['itemDesc']
   ) {
   // 哪些不合并:itemCode不一样的,不合并
   this.spanArr[row * this.colFields.length + j] = {
   rowspan: 1,
   colspan: 1,
   };
   } else if (
   this.tableData[row][this.colFields[j]] ===
   this.tableData[row - 1][this.colFields[j]]
   ) {
   let beforeItem =
   this.spanArr[(row - 1) * this.colFields.length + j];
   this.spanArr[row * this.colFields.length + j] = {
   rowspan: 1 + beforeItem.rowspan, // 合并几列
   colspan: 1, // 合并几行
   };
   beforeItem.rowspan = 0;
   beforeItem.colspan = 0;
   } else {
   // rowspan 和 colspan 都为1表格此单元格不合并
   this.spanArr[row * this.colFields.length + j] = {
   rowspan: 1,
   colspan: 1,
   };
   }
   }
   }
   }
   }
   // 对数据进行倒序
   let stack = [];
   for (let i = 0; i < this.colFields.length; i++) {
   for (let j = 0; j < this.tableData.length; j++) {
   // console.log("i=" + i + " j=" + j);
   // i 表示列 j表示行
   if (j === 0) {
   if (this.spanArr[j * this.colFields.length + i].rowspan === 0) {
   stack.push(this.spanArr[j * this.colFields.length + i]);
   }
   } else {
   if (this.spanArr[j * this.colFields.length + i].rowspan === 0) {
   stack.push(this.spanArr[j * this.colFields.length + i]);
   } else {
   stack.push(this.spanArr[j * this.colFields.length + i]);
   while (stack.length > 0) {
   let pop = stack.pop();
   let len = stack.length;
   this.spanArr[(j - len) * this.colFields.length + i] = pop;
   }
   }
   }
   }
   }
   // console.log(this.spanArr);
   },
   objectSpanMethod({ row, column, rowIndex, columnIndex }) {
   // console.log(this.spanArr[rowIndex * this.colFields.length + columnIndex]);
   return this.spanArr[rowIndex * this.colFields.length + columnIndex];
   },