JavaScript合并table相同内容的单元格

程序员文章站 2024-02-28 17:40:34

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>JavaScript合并table相同内容的单元格</title>
</head>
<body>
    <style type="text/css">
        textarea{
            height: 400px;
        }
        table
        {
            border-collapse: collapse;
            margin: 0 auto;
            text-align: center;
        }
        table td, table th
        {
            border: 1px solid #666666;
        }
    </style>

    <script>
        / 
        //功能：合并表格 
        //参数：tb－需要合并的表格ID 
        //参数：colLength－－需要对前几列进行合并，比如， 
        //想合并前两列，后面的数据列忽略合并，colLength应为2 
        //缺省表示对全部列合并
        /// 
        function mergeTableCell(tb, colLength) {
            tb = document.getElementById(tb);
            //检查表格是否规整
            if (!checkTableRegular(tb)) return;
            var i = 0;
            var j = 0;
            var rowCount = tb.rows.length;
            var colCount = tb.rows[0].cells.length;
            var obj1 = null;
            var obj2 = null;
            
            //为每个单元格命名
            for (i = 0; i < rowCount; i++) {
                for (j = 0; j < colCount; j++) {
                    tb.rows[i].cells[j].id = 'tb__' + i.toString() + '_' + j.toString();
                }
            }
            //逐列检查合并 
            for (i = 0; i < colCount; i++) {
                if (i == colLength) return;
                obj1 = document.getElementById('tb__0_' + i.toString());
                for (j = 1; j < rowCount; j++) {
                    obj2 = document.getElementById('tb__' + j.toString() + '_' + i.toString());
                    if (obj1.innerText == obj2.innerText) {
                        obj1.rowSpan ++;
                        obj2.parentNode.removeChild(obj2);
                    } else {
                        obj1 = document.getElementById('tb__' + j.toString() + '_' + i.toString());
                    }
                }
            }
        }

        / 
        //功能：检查表格是否规整
        //参数：tb－－需要检查的table
        /
        function checkTableRegular(tb) {
            if (tb.rows.length == 0) return false;
            if (tb.rows[0].cells.length == 0) return false;
            for (var i = 0; i < tb.rows.length; i++) {
                if (tb.rows[0].cells.length != tb.rows[i].cells.length) return false;
            }
            return true;
        }
    </script>


    <table id="table1">
        <tr>
            <td>A1</td>
            <td>B1</td>
            <td>C1</td>
            <td>1</td>
        </tr>
        <tr>
            <td>A1</td>
            <td>B1</td>
            <td>C2</td>
            <td>2</td>
        </tr>
        <tr>
            <td>A1</td>
            <td>B2</td>
            <td>C3</td>
            <td>4</td>
        </tr>
        <tr>
            <td>A1</td>
            <td>B2</td>
            <td>C4</td>
            <td>4</td>
        </tr>
    </table>
    <br>
    <input type="button" value="合并相同内容的单元格" onclick="mergeTableCell('table1')">
</body>
</html>

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