<template>
  <div class="vueWrap">
    <el-table
      :span-method="objectSpanMethod"
      style="width: 800px"
      :data="tableBody"
      border
      :header-cell-style="{
        background: '#FAFAFA',
        color: '#333333',
        fontWeight: 'bold',
        fontSize: '14px',
      }"
    >
      <el-table-column
        type="index"
        label="序號(hào)"
        width="58"
        align="center"
      ></el-table-column>
      <el-table-column
        prop="toolsKinds"
        label="設(shè)備類別"
        align="center"
      ></el-table-column>
      <el-table-column prop="toolsName" label="設(shè)備名稱" align="center"></el-table-column>
      <el-table-column prop="price" label="價(jià)格（元）" align="center"></el-table-column>
      <el-table-column prop="remark" label="備注" align="center"></el-table-column>
    </el-table>
  </div>
</template>

<script>
export default {
  data() {
    return {
      // 表體數(shù)據(jù)
      tableBody: [
        {
          toolsKinds: "螺絲刀",
          toolsName: "一號(hào)螺絲刀",
          price: 10,
          remark: "",
        },
        {
          toolsKinds: "螺絲刀",
          toolsName: "二號(hào)螺絲刀",
          price: 20,
          remark: "",
        },
        {
          toolsKinds: "螺絲刀",
          toolsName: "三號(hào)螺絲刀",
          price: 30,
          remark: "",
        },
        {
          toolsKinds: "扳手",
          toolsName: "大號(hào)扳手",
          price: 88,
          remark: "",
        },
        {
          toolsKinds: "扳手",
          toolsName: "中號(hào)扳手",
          price: 44,
          remark: "",
        },
        {
          toolsKinds: "老虎鉗子",
          toolsName: "火星專供老虎鉗",
          price: 999,
          remark: "",
        },
        {
          toolsKinds: "老虎鉗子",
          toolsName: "土星專供老虎鉗",
          price: 1001,
          remark: "",
        },
      ],
      cellList: [], // 單元格數(shù)組
      count: null, // 計(jì)數(shù)
    };
  },
  mounted() {
    // 第1步，根據(jù)表體信息，計(jì)算合并單元格的信息
    this.computeCell(this.tableBody);
  },
  methods: {
    computeCell(tableBody) {
      // 循環(huán)遍歷表體數(shù)據(jù)
      for (let i = 0; i < tableBody.length; i++) {
        if (i == 0) {
          // 先設(shè)置第一項(xiàng)
          this.cellList.push(1); // 初為1，若下一項(xiàng)和此項(xiàng)相同，就往cellList數(shù)組中追加0
          this.count = 0; // 初始計(jì)數(shù)為0
          console.log("索引", 0, this.count);
        } else {
          // 判斷當(dāng)前項(xiàng)與上項(xiàng)的設(shè)備類別是否相同，因?yàn)槭呛喜⑦@一列的單元格
          if (tableBody[i].toolsKinds == tableBody[i - 1].toolsKinds) {
            // 如果相等
            this.cellList[this.count] += 1; // 增加計(jì)數(shù)
            this.cellList.push(0); // 相等就往cellList數(shù)組中追加0
            console.log("索引", i, this.count);
          } else {
            this.cellList.push(1); // 不等就往cellList數(shù)組中追加1
            this.count = i; // 將索引賦值為計(jì)數(shù)
            console.log("索引", i, this.count);
          }
        }
      }
    },
    // 第2步，將計(jì)算好的結(jié)果返回給el-table，這樣的話表格就會(huì)根據(jù)這個(gè)結(jié)果做對(duì)應(yīng)合并列渲染
    objectSpanMethod({ row, column, rowIndex, columnIndex }) {
      // 給第二列做單元格合并。0是第一列，1是第二列。
      if (columnIndex === 1) {
        console.log("單元格數(shù)組，若下一項(xiàng)為0，則代表合并上一項(xiàng)", this.cellList);
        const rowCell = this.cellList[rowIndex];
        if (rowCell > 0) {
          const colCell = 1;
          console.log(`動(dòng)態(tài)豎向合并單元格, 第${colCell}列，豎向合并${rowCell}個(gè)單元格 `);
          return {
            rowspan: rowCell,
            colspan: colCell,
          };
        } else {
          // 清除原有的單元格，必須要加，否則就會(huì)出現(xiàn)單元格會(huì)被橫著擠到后面了?。。?
          // 本例中數(shù)據(jù)是寫死的不會(huì)出現(xiàn)，數(shù)據(jù)若是動(dòng)態(tài)后端獲取的，就會(huì)出現(xiàn)了?。?！
          return {
            rowspan: 0,
            colspan: 0,
          };
        }
      }
    },
  },
};
</script>

<template>
  <div id="kkk">
    <el-table
      :data="tableData"
      :span-method="objectSpanMethod"
      border
      style="width: 100%"
    >
      <el-table-column type="index" label="序號(hào)" width="50"> </el-table-column>
      <el-table-column prop="type" label="設(shè)備類別" align="center">
      </el-table-column>
      <el-table-column prop="mcName" label="設(shè)備名稱" align="center">
      </el-table-column>
      <el-table-column prop="price" label="價(jià)格" align="center">
      </el-table-column>
    </el-table>
  </div>
</template>

<script>
export default {
  data() {
    return {
      tableData: [
        {
          type: "螺絲刀",
          mcName: "一號(hào)螺絲刀",
          price: "10",
        },
        {
          type: "螺絲刀",
          mcName: "二號(hào)螺絲刀",
          price: "20",
        },
        {
          type: "螺絲刀",
          mcName: "三號(hào)螺絲刀",
          price: "30",
        },
        {
          type: "扳手",
          mcName: "大號(hào)扳手",
          price: "88",
        },
        {
          type: "扳手",
          mcName: "中號(hào)扳手",
          price: "44",
        },
        {
          type: "老虎鉗子",
          mcName: "火星專供",
          price: "999",
        },
        {
          type: "老虎鉗子",
          mcName: "土星專供",
          price: "1001",
        },
      ],
    };
  },
  methods: {
    /**
     * 1. 若是objectSpanMethod不返回任何東西，表格不會(huì)變化
     * 2. 最外層的判斷一般是，先從第幾列開始合并
     * 3. 這次從第0行合并2個(gè)，下次就要從第3行開始合并（0行加倆，就到3行了）
     * 4. 這種方式是有多少條數(shù)據(jù)，合并多少條數(shù)據(jù)，比如本案例中有7條數(shù)據(jù)（從第0條合并到第7條）
     * 5. return { rowspan: 0, colspan: 0 } // 表示不合并
     * */
    objectSpanMethod({ row, column, rowIndex, columnIndex }) {
      console.log("rowIndex", rowIndex);
      // 準(zhǔn)備在第二列進(jìn)行合并操作
      if (columnIndex == 1) {
        // 從第0行進(jìn)行合并
        if (rowIndex == 0) {
          return {
            rowspan: 3, // 合并3行
            colspan: 1, // 合并1列（當(dāng)前列）
          };
        }
        if (rowIndex == 3) {
          return {
            rowspan: 2, // 合并2行
            colspan: 1, // 合并1列
          };
        }
        if (rowIndex == 5) {
          return {
            rowspan: 2, // 合并1行
            colspan: 1, // 合并1列
          };
        }
      }
    },
  },
};
</script>