UnhandledPromiseRejectionWarning：错误：无效地址：未定义。如何处理？

Question

我正在循环遍历一个 Excel 文件的 Sheet 1，该文件包含 3 列和 100 行数据（字符串），并将一行中的每个单元格与 Sheet 2 中的组合行进行比较。

检查应开始逐行使用Sheet 1，逐行查看行中每个单元格的值是否与Sheet 2 中的值匹配。如果检查失败，则应停止对该行的进一步检查，并开始要检查的下一行。 Sheet 1 中无法匹配的单元格应标记为红色。

下面的代码接近我需要的代码，但如果Sheet 1 的一行中有2 个或更多单元格（例如Row 1: B2 and B3）与Sheet 2 的任何行中的任何内容都不匹配，则会引发错误.

错误：

(node:9040) UnhandledPromiseRejectionWarning: Error: Invalid Address: Aundefined
    at Object.validateAddress (C:\node_modules\exceljs\dist\es5\utils\col-cache.js:86:13)
    at new module.exports (C:\node_modules\exceljs\dist\es5\doc\cell.js:29:12)
    at module.exports.getCellEx (C:\node_modules\exceljs\dist\es5\doc\row.js:55:14)
    at module.exports.getCell (C:\node_modules\exceljs\dist\es5\doc\row.js:72:41)
    at C:\so.js:56:61
    at C:\node_modules\exceljs\dist\es5\doc\worksheet.js:370:11
    at Array.forEach (<anonymous>)
    at module.exports.eachRow (C:\node_modules\exceljs\dist\es5\doc\worksheet.js:368:18)
    at C:\so.js:16:19
    at <anonymous>
(node:9040) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 1)
(node:9040) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

示例数据：

表 1：

| COL A | COL B  | COL C  |
|-------|--------|--------|
| bob   | one    | silver |
| bob   | eleven | blue   |
| bob   | eleven | red    |
| bob   | eleven | red    |
| bob   | one    | red    |
| bob   | eight  | red    |
| bob   | eight  | red    |
| bob   | eight  | red    |
| terry | seven  | yellow |
| terry | seven  | yellow |
| terry | seven  | gold   |

表 2：

| COL A | COL B  | COL C  |
|-------|--------|--------|
| bob   | eleven | blue   |
| bob   | eleven | red    |
| bob   | eight  | red    |
| terry | seven  | yellow |
| terry | seven  | orange |

根据示例数据，new.xlsx 的Sheet 1 中应该有三个单元格（B1、B5 和C11）标记为红色。例如

这是一个scenarios example PDF，说明应该如何进行检查：

代码：

// Import the library
var Excel = require('exceljs'),
    moment = require('moment'),
    // Define Excel filename
    ExcelFile = 'so.xlsx',
    // Read from the file
    workbook = new Excel.Workbook();

workbook.xlsx.readFile(ExcelFile)
    .then(function()
    {
        // Use workbook
        var dataSheet = workbook.getWorksheet('Sheet 1'),
            masterSheet = workbook.getWorksheet('Sheet 2');

        dataSheet.eachRow({ includeEmpty: false }, function(dataRow, dataRowNumber)
        {
            var dataRowCells =
                {
                    dataCell1: dataRow.getCell('A'),
                    dataCell2: dataRow.getCell('B'),
                    dataCell3: dataRow.getCell('C')
                },
                isdataRowOK = false,
                oneOfBestMasterRowNumber,
                cellNames = ['A','B','C'];

            masterSheet.eachRow({ includeEmpty: false }, function(masterRow, masterRowNumber)
            {
                if(!isdataRowOK)
                {
                    var numberOfGoodCellsInRow = 0;

                    for(var i = 1; i < 4; i++)
                        if(dataRowCells['dataCell' + i].value === masterRow.getCell(cellNames[i-1]).value)
                            numberOfGoodCellsInRow++;

                    if(numberOfGoodCellsInRow == 2)
                        oneOfBestMasterRowNumber = masterRowNumber;

                    if(numberOfGoodCellsInRow == 3)
                        isdataRowOK = true
                }
            });


            if(!isdataRowOK)
            {
                var masterRowForCheck = masterSheet.getRow(oneOfBestMasterRowNumber);

                for(var i = 1; i < 4; i++)
                {
                    var dataCell = dataRowCells['dataCell' + i];
                    if(dataCell.value !== masterRowForCheck.getCell(cellNames[i-1]).value)
                    {
                        // Mark this failed cell as color red
                        dataCell.style = Object.create(dataCell.style); // Shallow-clone the style, break references
                        dataCell.fill = {type: 'pattern', pattern:'solid', fgColor:{argb:'FA8072'}}; // Set background
                    }
                }

            }
        });

        return workbook.xlsx.writeFile('new.xlsx');
    });

Answer 1

此错误的来源是第二行调用：

if(!isdataRowOK)

在这个地方变量oneOfBestMasterRowNumber 不应该是undefined 如果一行中的3 个单元格是坏的，因为在它之后如果getRow('undefined') 那么我们有一个错误。正因为如此，我们现在像下面这样检查它并为其写入值1（1. 行号），因为在这种情况下它并不重要。

if(oneOfBestMasterRowNumber == void 0) //void 0 - undefined
    oneOfBestMasterRowNumber = 1;

还有一个地方我们应该改变：而不是代码行：

if(numberOfGoodCellsInRow == 2)
    oneOfBestMasterRowNumber = masterRowNumber;

我们应该写几行：

if(numberOfGoodCellsInRow > numberOfGoodCellsInBestRow)
{
    numberOfGoodCellsInBestRow = numberOfGoodCellsInRow;
    oneOfBestMasterRowNumber = masterRowNumber;
}

因为不止一个单元格可能在该行中是坏的。我们现在也有了新变量numberOfGoodCellsInBestRow。

如果行中的两个或三个单元格不好，我认为最好标记它们，但是如果您只想要一行中的一个单元格，那么您可以在单元格着色后取消注释break;。

在下面的代码中也可以查看我的 cmets：

// Import the library
var Excel = require('exceljs'),
    moment = require('moment'),
    // Define Excel filename
    ExcelFile = 'so.xlsx',
    // Read from the file
    workbook = new Excel.Workbook();

workbook.xlsx.readFile(ExcelFile)
    .then(function()
    {
        // Use workbook
        var dataSheet = workbook.getWorksheet('Sheet 1'),
            masterSheet = workbook.getWorksheet('Sheet 2');

        dataSheet.eachRow({ includeEmpty: false }, function(dataRow, dataRowNumber)
        {
            var dataRowCells =
                {
                    dataCell1: dataRow.getCell('A'),
                    dataCell2: dataRow.getCell('B'),
                    dataCell3: dataRow.getCell('C')
                },
                isdataRowOK = false,
                oneOfBestMasterRowNumber,
                cellNames = ['A','B','C'],
                numberOfGoodCellsInBestRow = 0;

            masterSheet.eachRow({ includeEmpty: false }, function(masterRow, masterRowNumber)
            {
                if(!isdataRowOK)
                {
                    var numberOfGoodCellsInRow = 0;

                    for(var i = 1; i < 4; i++)
                        if(dataRowCells['dataCell' + i].value === masterRow.getCell(cellNames[i-1]).value)
                            numberOfGoodCellsInRow++;

                    //here we detect if 1 or 2 cells are bad
                    if(numberOfGoodCellsInRow > numberOfGoodCellsInBestRow)
                    {
                        numberOfGoodCellsInBestRow = numberOfGoodCellsInRow;
                        oneOfBestMasterRowNumber = masterRowNumber;
                    }

                    if(numberOfGoodCellsInRow == 3)
                        isdataRowOK = true
                }
            });

            //here was error source: oneOfBestMasterRowNumber
            //should be not undefined if 3 cells in row are bad
            if(oneOfBestMasterRowNumber == void 0)//void 0 - undefined
                oneOfBestMasterRowNumber = 1;

            if(!isdataRowOK)
            {
                //here was error place: if getRow('undefined') then was error
                var masterRowForCheck = masterSheet.getRow(oneOfBestMasterRowNumber);

                for(var i = 1; i < 4; i++)
                {
                    var dataCell = dataRowCells['dataCell' + i];
                    if(dataCell.value !== masterRowForCheck.getCell(cellNames[i-1]).value)
                    {
                        // Mark this failed cell as color red
                        dataCell.style = Object.create(dataCell.style); // Shallow-clone the style, break references
                        dataCell.fill = {type: 'pattern', pattern:'solid', fgColor:{argb:'FA8072'}}; // Set background
                        //break; uncomment this if you want only one cell as color red marked in the row
                    }
                }

            }
        });

        return workbook.xlsx.writeFile('new.xlsx');
    });
}

可视化示例

我已将 Node.js 代码翻译成客户端 JavaScrpt 代码，以通过检查以下 sn-p 中的两个不同数据集（模仿 Excel 表）来演示它：

function checkDataset(obj)
{
    var radios = obj.parentNode.elements['dataset'],
        dataSetNumber,
        i = radios.length;

    for(; i--;)
        if(radios[i].checked)
        {
            dataSetNumber = i;
            break
        }

    var dataSheet = xlsFile['data' + dataSetNumber],
        masterSheet = xlsFile['master' + dataSetNumber];

    dataSheet.forEach(function(dataRow, dataRowIndex)
    {
        var dataRowCells =
            {
                dataCell1: dataRow.A,
                dataCell2: dataRow.B,
                dataCell3: dataRow.C
            },
            isdataRowOK = false,
            oneOfBestMasterRowIndex,
            cellNames = ['A','B','C'],
            numberOfGoodCellsInBestRow = 0;

        masterSheet.forEach(function(masterRow, masterRowIndex)
        {
            if(!isdataRowOK)
            {
                var numberOfGoodCellsInRow = 0;

                for(var i = 1; i < 4; i++)
                    if(dataRowCells['dataCell' + i].value === masterRow[cellNames[i-1]].value)
                        numberOfGoodCellsInRow++;

                //here we detect if 1 or 2 cells are bad
                if(numberOfGoodCellsInRow > numberOfGoodCellsInBestRow)
                {
                    numberOfGoodCellsInBestRow = numberOfGoodCellsInRow;
                    oneOfBestMasterRowIndex = masterRowIndex;
                }

                if(numberOfGoodCellsInRow == 3)
                    isdataRowOK = true
            }
        });

        //oneOfBestMasterRowIndex should be not undefined if 3 cells in row are bad
        if(oneOfBestMasterRowIndex == void 0)//void 0 - undefined
            oneOfBestMasterRowIndex = 0;

        if(!isdataRowOK)
        {
            var masterRowForCheck = masterSheet[oneOfBestMasterRowIndex];

            for(var i = 1; i < 4; i++)
            {
                var dataCell = dataRowCells['dataCell' + i];
                if(dataCell.value !== masterRowForCheck[cellNames[i-1]].value)
                {
                    // Mark this failed cell as color red
                    dataCell.bgColor = 'red';
                    //break; uncomment this if you want only one cell as color red marked in the row
                }
            }

        }
    });

    var table = '<table border="1"><tr style="background:#00a;color:#fff">'
                + '<th>A</th><th>B</th><th>C</th></tr>';

    dataSheet.forEach(function(dataRow, dataRowIndex)
    {
        table += '<tr>';
        for(var i in dataRow)
            table += '<td bgcolor="' + (dataRow[i].bgColor ? 'red' : '')
                        + '">' + dataRow[i].value + '</td>';

        table += '</tr>';
    });
    document.write(table + '</table>');
}

function cells(strValues)
{
    var v = strValues.split('\t');
    return{A: {value: v[0]}, B: {value: v[1]}, C: {value: v[2]}}
}

var xlsFile =
{
    //Dataset 1:
    data0:
    [
        cells('bob	sacsac	sxcsc'),
        cells('sacfbrb	eleven	blue'),
        cells('ascasc	one	red'),
        cells('tyjytn	one	red'),
        cells('ascsac	one	red'),
        cells('terry	elf	yellow'),
        cells('terry	seven	elf'),
        cells('terry	elf	elf'),
        cells('terry	elf	elf'),
        cells('terry	seven	yellow'),
        cells('terry	elf	elf'),
        cells('terry	seven	orange'),
        cells('terry	seven	yellow'),
        cells('santa	mary	jane'),
        cells('bob	zero	mauve'),
        cells('bob	one	silver'),
        cells('bob	eleven	blue'),
        cells('bob	eleven	red'),
        cells('bob	eleven	red'),
        cells('bob	one	red'),
        cells('bob	eight	red'),
        cells('bob	eight	red'),
        cells('bob	eight	red'),
        cells('terry	seven	yellow'),
        cells('terry	seven	yellow'),
        cells('terry	seven	gold')
    ],
    master0:
    [
        cells('bob	eleven	blue'),
        cells('bob	eleven	red'),
        cells('bob	eight	red'),
        cells('terry	seven	yellow'),
        cells('bob	seven	yellow'),
        cells('terry	seven	orange'),
        cells('tiger	one	red')
    ],


    //Dataset 2:
    data1:
    [
        cells('bob	one	blue'),
        cells('bob	eleven	blue'),
        cells('bob	eleven	red'),
        cells('bob	eleven	red'),
        cells('bob	one	red'),
        cells('bob	eight	red'),
        cells('bob	eight	red'),
        cells('bob	eight	red'),
        cells('terry	seven	yellow'),
        cells('terry	seven	yellow'),
        cells('terry	seven	gold')
    ],
    master1:
    [
        cells('bob	eleven	blue'),
        cells('bob	eleven	red'),
        cells('bob	eight	red'),
        cells('terry	seven	yellow'),
        cells('terry	seven	orange')
    ]
};

<form method="post" action="#">
    <p><b>Which dataset do you want check?</b></p>
    <label><input type="radio" name="dataset">Dataset 1</label><br>
    <label><input type="radio" name="dataset" checked>Dataset 2</label><br><br>
    <input type="button" value="Check it" onclick="checkDataset(this)">
</form>

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