＜el-table＞把表格内同一列相同的数据合并为一行

news2024/9/21 5:29:55

`<el-table>` 把表格内同一列相同的数据合并为一行

具体效果如下图：

具体效果如图

参考代码（可直接运行）：


<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8"/>
    <meta name="viewport" content="width=device-width,initial-scale=1.0"/>
    <script src="https://unpkg.com/vue@3"></script>
    <!-- import CSS -->
    <link rel="stylesheet" href="https://unpkg.com/element-plus/dist/index.css">
    <!-- import JavaScript -->
    <script src="https://unpkg.com/element-plus"></script>
    <title>合并行或列</title>
</head>
<body>
<div id="view_table_merge_columns" class="common-layout">
    <el-table
            :data="tableData"
            :span-method="objectSpanMethod"
            border
            stripe
            style="width: 100%"
            :header-cell-style="{ textAlign: 'center', 'background-color': '#F5F7FA', }"
            :cell-style="{ textAlign: 'center' }"
    >
        <el-table-column prop="id" label="编号"></el-table-column>
        <el-table-column prop="first" label="一级标题"></el-table-column>
        <el-table-column prop="second" label="二级标题"></el-table-column>
        <el-table-column prop="third" label="三级标题"></el-table-column>
        <el-table-column prop="outcome" label="结果"></el-table-column>
    </el-table>
</div>
<script>
    const App = {
        data() {
            return {
                // 需要合并的列
                needToMergeColumns: ['first', 'second', 'third'],
                // 列表数据
                tableData: [
                    {
                        id: '101',
                        first: '第一单元',
                        second: '第一课',
                        third: '问题一',
                        outcome: 10,
                    },
                    {
                        id: '102',
                        first: '第一单元',
                        second: '第二课',
                        third: '问题一',
                        outcome: 10,
                    },
                    {
                        id: '103',
                        first: '第一单元',
                        second: '第二课',
                        third: '问题二',
                        outcome: 10,
                    }, {
                        id: '104',
                        first: '第二单元',
                        second: '第一课',
                        third: '问题一',
                        outcome: 10,
                    },
                    {
                        id: '105',
                        first: '第二单元',
                        second: '第一课',
                        third: '问题二',
                        outcome: 9,
                    },
                    {
                        id: '106',
                        first: '第三单元',
                        second: '第一课',
                        third: '问题一',
                        outcome: 5,
                    },
                ],
            };
        },

        methods: {
            // 同一列内合并值相同行 （当前行 row、当前列 column、当前行号 rowIndex、当前列号 columnIndex 四个属性）
            objectSpanMethod({row, column, rowIndex, columnIndex}) {
                console.log(row);
                console.log(column);
                console.log(rowIndex, columnIndex);
                if (this.needToMergeColumns.indexOf(column.property) !== -1) {
                    // 获取当前单元格的值
                    const currentValue = row[column.property];
                    // 获取上一行相同列的值
                    const preRow = this.tableData[rowIndex - 1];
                    const preValue = preRow ? preRow[column.property] : null;
                    // 如果当前值和上一行的值相同，则将当前单元格隐藏
                    if (currentValue === preValue) {
                        return {'rowspan': 0, 'colspan': 0};
                    } else {
                        // 否则计算当前单元格应该跨越多少行
                        let rowspan = 1;
                        for (let i = rowIndex + 1; i < this.tableData.length; i++) {
                            const nextRow = this.tableData[i];
                            const nextValue = nextRow[column.property];
                            if (nextValue === currentValue) {
                                rowspan++;
                            } else {
                                break;
                            }
                        }
                        return {'rowspan': rowspan, 'colspan': 1};
                    }
                }
            }
        }
    };
    const app = Vue.createApp(App);
    app.use(ElementPlus);
    app.mount("#view_table_merge_columns");
</script>
</body>
</html>