数据验证

数据验证类型和执行

数据验证是设置有关工作表上输入的数据的规则的能力。例如，使用验证可确保标有日期的列仅包含日期，或者另一列仅包含数字。甚至可以确保标有日期的列仅包含特定范围内的日期。通过数据验证，可以控制输入工作表中单元格的内容。

Microsoft Excel 支持许多不同类型的数据验证。 每种类型用于控制输入到单元格或单元格范围中的数据类型。 下面的代码片段说明了如何验证：

  • 数字是整数，即它们没有小数部分。
  • 十进制数遵循正确的结构。代码示例定义了一组单元格应具有两个小数位。
  • 值受限于值列表。列表验证定义了可应用于单元格或单元格范围的单独值列表。
  • 日期在特定范围内。
  • 时间在特定范围内。
  • 文本在给定的字符长度内。

Microsoft Excel中的数据验证

要使用Microsoft Excel创建验证：

  1. 在工作表中，选择要应用验证的单元格。
  2. 从数据菜单中选择验证。将显示验证对话框。
  3. 单击设置选项卡并输入设置。

使用Aspose.Cells for JavaScript通过C++实现数据验证

数据验证是一项强大的功能，可验证输入工作表的信息。借助数据验证，开发人员可以为用户提供选择列表，限制数据输入为特定类型或大小等功能。 在Aspose.Cells for JavaScript通过C++中，每个Worksheet类都具有一个validations集合，代表一组Validation对象。设置验证时，可以按照以下方式设置Validation类的一些属性：

  • 类型——代表验证类型，可以使用 ValidationType 枚举中的预定义值之一进行指定。
  • 运算符——代表用于验证的运算符，可以使用 OperatorType 枚举中的预定义值之一进行指定。
  • Formula1 – 表示与数据验证的第一部分关联的值或表达式。
  • Formula2 – 表示与数据验证的第二部分关联的值或表达式。

当 Validation 对象的属性配置完成后，开发者可以使用 CellArea 结构存储有关使用创建的验证进行验证的单元格范围的信息。

数据验证类型

ValidationType 枚举具有以下成员：

成员名称 描述
AnyValue 表示任何类型的值。
WholeNumber 表示整数的验证类型。
Decimal 表示十进制数字的验证类型。
List 表示下拉列表的验证类型。
Date 表示日期的验证类型。
Time 表示时间的验证类型。
TextLength 表示文本长度的验证类型。
Custom 表示自定义验证类型。
整数数据验证

使用此类验证，用户只能在验证的单元格内输入特定范围内的整数。以下代码示例演示如何实现整数字段验证类型。示例中用Aspose.Cells for JavaScript通过C++创建了与上面微软Excel中相同的数据验证。

<!DOCTYPE html>
<html>
    <head>
        <title>Aspose.Cells Example</title>
    </head>
    <body>
        <h1>Aspose.Cells Validation Example</h1>
        <input type="file" id="fileInput" accept=".xls,.xlsx,.csv" />
        <button id="runExample">Run Example</button>
        <a id="downloadLink" style="display: none;">Download Result</a>
        <div id="result"></div>
    </body>

    <script src="aspose.cells.js.min.js"></script>
    <script type="text/javascript">
        const { Workbook, SaveFormat } = AsposeCells;

        AsposeCells.onReady({
            license: "/lic/aspose.cells.enc",
            fontPath: "/fonts/",
            fontList: [
                "arial.ttf",
                "NotoSansSC-Regular.ttf"
            ]
        }).then(() => {
            console.log("Aspose.Cells initialized");
        });

        document.getElementById('runExample').addEventListener('click', async () => {
            const resultDiv = document.getElementById('result');
            const fileInput = document.getElementById('fileInput');

            if (fileInput.files.length > 0) {
                // If a file is provided, we will open it; otherwise create a new workbook
                const file = fileInput.files[0];
                const arrayBuffer = await file.arrayBuffer();
                // Instantiate workbook from uploaded file
                var workbook = new Workbook(new Uint8Array(arrayBuffer));
            } else {
                // Create a new workbook
                var workbook = new Workbook();
            }

            // Create a worksheet and get the first worksheet.
            const ExcelWorkSheet = workbook.worksheets.get(0);

            // Accessing the Validations collection of the worksheet
            const validations = workbook.worksheets.get(0).validations;

            // Create Cell Area
            const ca = new AsposeCells.CellArea();
            ca.startRow = 0;
            ca.endRow = 0;
            ca.startColumn = 0;
            ca.endColumn = 0;

            // Creating a Validation object
            const idx = validations.add(ca);
            const validation = validations.get(idx);

            // Setting the validation type to whole number
            validation.type = AsposeCells.ValidationType.WholeNumber;

            // Setting the operator for validation to Between
            validation.operator = AsposeCells.OperatorType.Between;

            // Setting the minimum value for the validation
            validation.formula1 = "10";

            // Setting the maximum value for the validation
            validation.formula2 = "1000";

            // Applying the validation to a range of cells from A1 to B2 using the CellArea structure
            const area = new AsposeCells.CellArea();
            area.startRow = 0;
            area.endRow = 1;
            area.startColumn = 0;
            area.endColumn = 1;

            // Adding the cell area to Validation
            validation.addArea(area);

            // Save the workbook and provide a download link
            const outputData = workbook.save(SaveFormat.Excel97To2003);
            const blob = new Blob([outputData], { type: "application/vnd.ms-excel" });
            const downloadLink = document.getElementById('downloadLink');
            downloadLink.href = URL.createObjectURL(blob);
            downloadLink.download = 'output.out.xls';
            downloadLink.style.display = 'block';
            downloadLink.textContent = 'Download Excel File';

            resultDiv.innerHTML = '<p style="color: green;">Validation added successfully! Click the download link to get the modified file.</p>';
        });
    </script>
</html>
列表数据验证

这种类型的验证允许用户从下拉列表中输入值。它提供了一个列表：包含数据的一系列行。在示例中，添加了第二个工作表来保存列表源。用户只能从列表中选择值。验证区域是第一个工作表中的单元格范围 A1:A5。

这里重要的是要将 Validation.inCellDropDown(boolean) 属性设为 true。

<!DOCTYPE html>
<html>
    <head>
        <title>Aspose.Cells Example</title>
    </head>
    <body>
        <h1>Aspose.Cells Validation List Example</h1>
        <input type="file" id="fileInput" accept=".xls,.xlsx,.csv" />
        <button id="runExample">Run Example</button>
        <a id="downloadLink" style="display: none;">Download Result</a>
        <div id="result"></div>
    </body>

    <script src="aspose.cells.js.min.js"></script>
    <script type="text/javascript">
        const { Workbook, SaveFormat, CellArea, ValidationType, OperatorType, ValidationAlertType } = AsposeCells;

        AsposeCells.onReady({
            license: "/lic/aspose.cells.enc",
            fontPath: "/fonts/",
            fontList: [
                "arial.ttf",
                "NotoSansSC-Regular.ttf"
            ]
        }).then(() => {
            console.log("Aspose.Cells initialized");
        });

        document.getElementById('runExample').addEventListener('click', async () => {
            const fileInput = document.getElementById('fileInput');
            // This example creates a new workbook in the browser (file input is optional here).
            const workbook = new Workbook();

            // Get the first worksheet.
            const worksheet1 = workbook.worksheets.get(0);

            // Add a new worksheet and access it.
            const i = workbook.worksheets.add();
            const worksheet2 = workbook.worksheets.get(i);

            // Create a range in the second worksheet.
            const range = worksheet2.cells.createRange("E1", "E4");

            // Name the range.
            range.name = "MyRange";

            // Fill different cells with data in the range.
            range.get(0, 0).value = "Blue";
            range.get(1, 0).value = "Red";
            range.get(2, 0).value = "Green";
            range.get(3, 0).value = "Yellow";

            // Get the validations collection.
            const validations = worksheet1.validations;

            // Create Cell Area
            const ca = new CellArea();
            ca.startRow = 0;
            ca.endRow = 0;
            ca.startColumn = 0;
            ca.endColumn = 0;

            // Create a new validation to the validations list.
            const validation = validations.get(validations.add(ca));

            // Set the validation type.
            validation.type = ValidationType.List;

            // Set the operator.
            validation.operator = OperatorType.None;

            // Set the in cell drop down.
            validation.inCellDropDown = true;

            // Set the formula1.
            validation.formula1 = "=MyRange";

            // Enable it to show error.
            validation.showError = true;

            // Set the alert type severity level.
            validation.alertStyle = ValidationAlertType.Stop;

            // Set the error title.
            validation.errorTitle = "Error";

            // Set the error message.
            validation.errorMessage = "Please select a color from the list";

            // Specify the validation area.
            const area = new CellArea();
            area.startRow = 0;
            area.endRow = 4;
            area.startColumn = 0;
            area.endColumn = 0;

            // Add the validation area.
            validation.addArea(area);

            // Save the Excel file.
            const outputData = workbook.save(SaveFormat.Excel97To2003);
            const blob = new Blob([outputData]);
            const downloadLink = document.getElementById('downloadLink');
            downloadLink.href = URL.createObjectURL(blob);
            downloadLink.download = 'output.out.xls';
            downloadLink.style.display = 'block';
            downloadLink.textContent = 'Download Excel File';

            document.getElementById('result').innerHTML = '<p style="color: green;">Validation list created successfully! Click the download link to get the file.</p>';
        });
    </script>
</html>
日期数据验证

使用此类型的验证，用户可以在验证单元格中输入符合指定范围或特定条件的日期值。在此示例中，用户被限制只能输入1970年至1999年之间的日期。这里，验证区域是B1单元格。

<!DOCTYPE html>
<html>
    <head>
        <title>Aspose.Cells Example</title>
    </head>
    <body>
        <h1>Date Validation Example</h1>
        <input type="file" id="fileInput" accept=".xls,.xlsx,.csv" />
        <button id="runExample">Run Example</button>
        <a id="downloadLink" style="display: none;">Download Result</a>
        <div id="result"></div>
    </body>

    <script src="aspose.cells.js.min.js"></script>
    <script type="text/javascript">
        const { Workbook, SaveFormat, Worksheet, Cell } = AsposeCells;

        AsposeCells.onReady({
            license: "/lic/aspose.cells.enc",
            fontPath: "/fonts/",
            fontList: [
                "arial.ttf",
                "NotoSansSC-Regular.ttf"
            ]
        }).then(() => {
            console.log("Aspose.Cells initialized");
        });

        document.getElementById('runExample').addEventListener('click', async () => {
            // This example creates a new workbook in the browser (no file input required)
            const workbook = new Workbook();

            // Obtain the cells of the first worksheet.
            const worksheet = workbook.worksheets.get(0);
            const cells = worksheet.cells;

            // Put a string value into the A1 cell.
            const cellA1 = cells.get("A1");
            cellA1.value = "Please enter Date b/w 1/1/1970 and 12/31/1999";

            // Set row height and column width for the cells by accessing row/column objects
            const row0 = cells.rows.get(0);
            row0.height = 31;
            const col0 = cells.columns.get(0);
            col0.width = 35;

            // Get the validations collection.
            const validations = worksheet.validations;

            // Create Cell Area
            const ca = new AsposeCells.CellArea();
            ca.startRow = 0;
            ca.endRow = 0;
            ca.startColumn = 0;
            ca.endColumn = 0;

            // Add a new validation.
            const validationIndex = validations.add(ca);
            const validation = validations.get(validationIndex);

            // Set the data validation type.
            validation.type = AsposeCells.ValidationType.Date;

            // Set the operator for the data validation
            validation.operator = AsposeCells.OperatorType.Between;

            // Set the value or expression associated with the data validation.
            validation.formula1 = "1/1/1970";

            // The value or expression associated with the second part of the data validation.
            validation.formula2 = "12/31/1999";

            // Enable the error.
            validation.showError = true;

            // Set the validation alert style.
            validation.alertStyle = AsposeCells.ValidationAlertType.Stop;

            // Set the title of the data-validation error dialog box
            validation.errorTitle = "Date Error";

            // Set the data validation error message.
            validation.errorMessage = "Enter a Valid Date";

            // Set and enable the data validation input message.
            validation.inputMessage = "Date Validation Type";
            validation.ignoreBlank = true;
            validation.showInput = true;

            // Set a collection of CellArea which contains the data validation settings.
            const cellArea = new AsposeCells.CellArea();
            cellArea.startRow = 0;
            cellArea.endRow = 0;
            cellArea.startColumn = 1;
            cellArea.endColumn = 1;

            // Add the validation area.
            validation.addArea(cellArea);

            // Save the Excel file and provide download link.
            const outputData = workbook.save(SaveFormat.Excel97To2003);
            const blob = new Blob([outputData], { type: "application/vnd.ms-excel" });
            const downloadLink = document.getElementById('downloadLink');
            downloadLink.href = URL.createObjectURL(blob);
            downloadLink.download = 'output.out.xls';
            downloadLink.style.display = 'block';
            downloadLink.textContent = 'Download Excel File';

            document.getElementById('result').innerHTML = '<p style="color: green;">Workbook created and validation added. Click the download link to get the file.</p>';
        });
    </script>
</html>
时间数据验证

使用此类型的验证，用户可以在验证单元格中输入符合指定范围或特定条件的时间值。在此示例中，用户被限制只能输入上午09:00至11:30之间的时间。这里，验证区域是B1单元格。

<!DOCTYPE html>
<html>
    <head>
        <title>Aspose.Cells Example</title>
    </head>
    <body>
        <h1>Time Validation Example</h1>
        <input type="file" id="fileInput" accept=".xls,.xlsx,.csv" />
        <button id="runExample">Run Example</button>
        <a id="downloadLink" style="display: none;">Download Result</a>
        <div id="result"></div>
    </body>

    <script src="aspose.cells.js.min.js"></script>
    <script type="text/javascript">
        const { Workbook, SaveFormat, Worksheet, Cell } = AsposeCells;

        AsposeCells.onReady({
            license: "/lic/aspose.cells.enc",
            fontPath: "/fonts/",
            fontList: [
                "arial.ttf",
                "NotoSansSC-Regular.ttf"
            ]
        }).then(() => {
            console.log("Aspose.Cells initialized");
        });

        document.getElementById('runExample').addEventListener('click', async () => {
            const fileInput = document.getElementById('fileInput');

            let workbook;
            if (fileInput.files.length) {
                const file = fileInput.files[0];
                const arrayBuffer = await file.arrayBuffer();
                workbook = new Workbook(new Uint8Array(arrayBuffer));
            } else {
                // Create a new workbook if no file is provided
                workbook = new Workbook();
            }

            // Obtain the cells of the first worksheet.
            const worksheet = workbook.worksheets.get(0);
            const cells = worksheet.cells;

            // Put a string value into A1 cell.
            const a1 = cells.get("A1");
            a1.value = "Please enter Time b/w 09:00 and 11:30 'o Clock";

            // Set the row height and column width for the cells using row/column objects.
            cells.rows.get(0).height = 31;
            cells.columns.get(0).width = 35;

            // Get the validations collection.
            const validations = worksheet.validations;

            // Create Cell Area
            const ca = new AsposeCells.CellArea();
            ca.startRow = 0;
            ca.endRow = 0;
            ca.startColumn = 0;
            ca.endColumn = 0;

            // Add a new validation and obtain it.
            const validationIndex = validations.add(ca);
            const validation = validations.get(validationIndex);

            // Set the data validation type and other properties.
            validation.type = AsposeCells.ValidationType.Time;
            validation.operator = AsposeCells.OperatorType.Between;
            validation.formula1 = "09:00";
            validation.formula2 = "11:30";
            validation.showError = true;
            validation.alertStyle = AsposeCells.ValidationAlertType.Information;
            validation.errorTitle = "Time Error";
            validation.errorMessage = "Enter a Valid Time";
            validation.inputMessage = "Time Validation Type";
            validation.ignoreBlank = true;
            validation.showInput = true;

            // Set a collection of CellArea which contains the data validation settings.
            const cellArea = new AsposeCells.CellArea();
            cellArea.startRow = 0;
            cellArea.endRow = 0;
            cellArea.startColumn = 1;
            cellArea.endColumn = 1;

            // Add the validation area.
            validation.addArea(cellArea);

            // Save the Excel file.
            const outputData = workbook.save(SaveFormat.Excel97To2003);
            const blob = new Blob([outputData], { type: 'application/vnd.ms-excel' });
            const downloadLink = document.getElementById('downloadLink');
            downloadLink.href = URL.createObjectURL(blob);
            downloadLink.download = 'output.out.xls';
            downloadLink.style.display = 'block';
            downloadLink.textContent = 'Download Excel File';

            document.getElementById('result').innerHTML = '<p style="color: green;">Operation completed successfully! Click the download link to get the modified file.</p>';
        });
    </script>
</html>
文本长度数据验证

使用此类型的验证，用户可以在验证单元格中输入指定长度的文本值。在此示例中，用户被限制只能输入不超过5个字符的字符串值。验证区域是B1单元格。

<!DOCTYPE html>
<html>
    <head>
        <title>Aspose.Cells Example</title>
    </head>
    <body>
        <h1>Aspose.Cells Example - Add Text Length Validation</h1>
        <input type="file" id="fileInput" accept=".xls,.xlsx,.csv" />
        <button id="runExample">Run Example</button>
        <a id="downloadLink" style="display: none;">Download Result</a>
        <div id="result"></div>
    </body>

    <script src="aspose.cells.js.min.js"></script>
    <script type="text/javascript">
        const { Workbook, SaveFormat, CellArea, ValidationType, OperatorType, ValidationAlertType } = AsposeCells;

        AsposeCells.onReady({
            license: "/lic/aspose.cells.enc",
            fontPath: "/fonts/",
            fontList: [
                "arial.ttf",
                "NotoSansSC-Regular.ttf"
            ]
        }).then(() => {
            console.log("Aspose.Cells initialized");
        });

        document.getElementById('runExample').addEventListener('click', async () => {
            // Create a new workbook.
            const workbook = new Workbook();

            // Obtain the cells of the first worksheet.
            const cells = workbook.worksheets.get(0).cells;

            // Put a string value into A1 cell.
            const cellA1 = cells.get("A1");
            cellA1.value = "Please enter a string not more than 5 chars";

            // Set row height and column width for the cell.
            cells.rows.get(0).height = 31;
            cells.columns.get(0).width = 35;

            // Get the validations collection.
            const validations = workbook.worksheets.get(0).validations;

            // Create Cell Area
            const ca = new CellArea();
            ca.startRow = 0;
            ca.endRow = 0;
            ca.startColumn = 0;
            ca.endColumn = 0;

            // Add a new validation.
            const validationIndex = validations.add(ca);
            const validation = validations.get(validationIndex);

            // Set the data validation type.
            validation.type = ValidationType.TextLength;

            // Set the operator for the data validation.
            validation.operator = OperatorType.LessOrEqual;

            // Set the value or expression associated with the data validation.
            validation.formula1 = "5";

            // Enable the error.
            validation.showError = true;

            // Set the validation alert style.
            validation.alertStyle = ValidationAlertType.Warning;

            // Set the title of the data-validation error dialog box.
            validation.errorTitle = "Text Length Error";

            // Set the data validation error message.
            validation.errorMessage = " Enter a Valid String";

            // Set and enable the data validation input message.
            validation.inputMessage = "TextLength Validation Type";
            validation.ignoreBlank = true;
            validation.showInput = true;

            // Set a collection of CellArea which contains the data validation settings.
            const cellArea = new CellArea();
            cellArea.startRow = 0;
            cellArea.endRow = 0;
            cellArea.startColumn = 1;
            cellArea.endColumn = 1;

            // Add the validation area.
            validation.addArea(cellArea);

            // Save the Excel file.
            const outputData = workbook.save(SaveFormat.Excel97To2003);
            const blob = new Blob([outputData]);
            const downloadLink = document.getElementById('downloadLink');
            downloadLink.href = URL.createObjectURL(blob);
            downloadLink.download = 'output.out.xls';
            downloadLink.style.display = 'block';
            downloadLink.textContent = 'Download Excel File';

            document.getElementById('result').innerHTML = '<p style="color: green;">File created successfully. Click the download link to get the file.</p>';
        });
    </script>
</html>

数据验证规则

当实现数据验证后，可以通过在单元格中设定不同值来检测验证结果。可以使用 cell.validationValue 获取验证结果。以下示例用不同的值展示了此功能。测试用的示例文件可以通过以下链接下载：

sampleDataValidationRules.xlsx

<!DOCTYPE html>
<html>
    <head>
        <title>Aspose.Cells Example</title>
    </head>
    <body>
        <h1>Data Validation Check Example</h1>
        <input type="file" id="fileInput" accept=".xls,.xlsx,.csv" />
        <button id="runExample">Run Example</button>
        <a id="downloadLink" style="display: none;">Download Result</a>
        <div id="result"></div>
    </body>

    <script src="aspose.cells.js.min.js"></script>
    <script type="text/javascript">
        const { Workbook, SaveFormat } = AsposeCells;

        AsposeCells.onReady({
            license: "/lic/aspose.cells.enc",
            fontPath: "/fonts/",
            fontList: [
                "arial.ttf",
                "NotoSansSC-Regular.ttf"
            ]
        }).then(() => {
            console.log("Aspose.Cells initialized");
        });

        document.getElementById('runExample').addEventListener('click', async () => {
            const fileInput = document.getElementById('fileInput');
            const resultDiv = document.getElementById('result');
            resultDiv.innerHTML = '';

            if (!fileInput.files.length) {
                resultDiv.innerHTML = '<p style="color: red;">Please select an Excel file.</p>';
                return;
            }

            const file = fileInput.files[0];
            const arrayBuffer = await file.arrayBuffer();

            // Instantiate the workbook from the uploaded Excel file
            const workbook = new Workbook(new Uint8Array(arrayBuffer));

            // Access the first worksheet
            const worksheet = workbook.worksheets.get(0);

            // Access Cell C1
            // Cell C1 has the Decimal Validation applied on it.
            // It can take only the values Between 10 and 20
            const cell = worksheet.cells.get("C1");

            const messages = [];

            // Enter 3 inside this cell
            // Since it is not between 10 and 20, it should fail the validation
            cell.value = 3;

            // Check if number 3 satisfies the Data Validation rule applied on this cell
            const isValid3 = cell.validationValue;
            messages.push(`Is 3 a Valid Value for this Cell: ${isValid3}`);

            // Enter 15 inside this cell
            // Since it is between 10 and 20, it should succeed the validation
            cell.value = 15;

            // Check if number 15 satisfies the Data Validation rule applied on this cell
            const isValid15 = cell.validationValue;
            messages.push(`Is 15 a Valid Value for this Cell: ${isValid15}`);

            // Enter 30 inside this cell
            // Since it is not between 10 and 20, it should fail the validation again
            cell.value = 30;

            // Check if number 30 satisfies the Data Validation rule applied on this cell
            const isValid30 = cell.validationValue;
            messages.push(`Is 30 a Valid Value for this Cell: ${isValid30}`);

            // Display results
            resultDiv.innerHTML = messages.map(m => `<p>${m}</p>`).join('');

            // Save the modified workbook and provide download link
            const outputData = workbook.save(SaveFormat.Xlsx);
            const blob = new Blob([outputData], { type: "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet" });
            const downloadLink = document.getElementById('downloadLink');
            downloadLink.href = URL.createObjectURL(blob);
            downloadLink.download = 'output.xlsx';
            downloadLink.style.display = 'block';
            downloadLink.textContent = 'Download Modified Excel File';
        });
    </script>
</html>

检查单元格中的验证是否为下拉列表

正如我们所见，单元格中可以实现许多类型的验证。如果你想检查验证是否为下拉菜单， 可以使用 validation.inCellDropDown 方法进行测试。以下示例代码展示了此属性的用法。可以从以下链接下载测试的示例文件：

sampleValidation.xlsx

<!DOCTYPE html>
<html>
    <head>
        <title>Aspose.Cells Example</title>
    </head>
    <body>
        <h1>Check Data Validation Drop-downs</h1>
        <input type="file" id="fileInput" accept=".xls,.xlsx,.csv" />
        <button id="runExample">Run Example</button>
        <a id="downloadLink" style="display: none;">Download Result</a>
        <div id="result"></div>
    </body>

    <script src="aspose.cells.js.min.js"></script>
    <script type="text/javascript">
        const { Workbook, SaveFormat } = AsposeCells;

        AsposeCells.onReady({
            license: "/lic/aspose.cells.enc",
            fontPath: "/fonts/",
            fontList: [
                "arial.ttf",
                "NotoSansSC-Regular.ttf"
            ]
        }).then(() => {
            console.log("Aspose.Cells initialized");
        });

        document.getElementById('runExample').addEventListener('click', async () => {
            const fileInput = document.getElementById('fileInput');
            const resultDiv = document.getElementById('result');
            resultDiv.innerHTML = '';

            if (!fileInput.files.length) {
                resultDiv.innerHTML = '<p style="color: red;">Please select an Excel file.</p>';
                return;
            }

            const file = fileInput.files[0];
            const arrayBuffer = await file.arrayBuffer();

            // Instantiating a Workbook object from uploaded file
            const workbook = new Workbook(new Uint8Array(arrayBuffer));

            // Accessing the worksheet named "Sheet1"
            const sheet = workbook.worksheets.get("Sheet1");
            const cells = sheet.cells;

            const appendMessage = (msg, color = 'black') => {
                const p = document.createElement('p');
                p.style.color = color;
                p.textContent = msg;
                resultDiv.appendChild(p);
            };

            const checkDropDown = (cell, cellRef) => {
                const validation = cell.validation;
                if (validation.inCellDropDown) {
                    appendMessage(`${cellRef} is a dropdown`, 'green');
                } else {
                    appendMessage(`${cellRef} is NOT a dropdown`, 'orange');
                }
            };

            checkDropDown(cells.get("A2"), "A2");
            checkDropDown(cells.get("B2"), "B2");
            checkDropDown(cells.get("C2"), "C2");
        });
    </script>
</html>

为现有验证添加CellArea

可能存在你想向现有 Validation 添加 CellArea 的情况。使用 Validation.addArea(CellArea) 添加 CellArea 时，Aspose.Cells 会检查所有现有区域，查看新区域是否已存在。如果文件中验证数量较多，可能会影响性能。为了解决此问题，API 提供了 Validation.addArea(CellArea, boolean, boolean) 方法。checkIntersection 参数表示是否检测给定区域与现有验证区域的交集。设为 false 将禁用对其他区域的检测。checkEdge 参数表示是否检查应用区域。如果新区域成为左上角区域，内部设置会被重建。若确定新区域不是左上角区域，可将此参数设为 false。

以下代码片段演示了如何使用 Validation.addArea(CellArea, boolean, boolean) 方法向现有 Validation 添加一个新 CellArea。

<!DOCTYPE html>
<html>
    <head>
        <title>Aspose.Cells Example - Validations</title>
    </head>
    <body>
        <h1>Validations Example</h1>
        <input type="file" id="fileInput" accept=".xls,.xlsx,.csv" />
        <button id="runExample">Run Example</button>
        <a id="downloadLink" style="display: none;">Download Result</a>
        <div id="result"></div>
    </body>

    <script src="aspose.cells.js.min.js"></script>
    <script type="text/javascript">
        const { Workbook, SaveFormat } = AsposeCells;

        AsposeCells.onReady({
            license: "/lic/aspose.cells.enc",
            fontPath: "/fonts/",
            fontList: [
                "arial.ttf",
                "NotoSansSC-Regular.ttf"
            ]
        }).then(() => {
            console.log("Aspose.Cells initialized");
        });

        document.getElementById('runExample').addEventListener('click', async () => {
            const fileInput = document.getElementById('fileInput');
            if (!fileInput.files.length) {
                document.getElementById('result').innerHTML = '<p style="color: red;">Please select an Excel file.</p>';
                return;
            }

            const file = fileInput.files[0];
            const arrayBuffer = await file.arrayBuffer();

            // Instantiating a Workbook object from uploaded file
            const workbook = new Workbook(new Uint8Array(arrayBuffer));

            // Access first worksheet.
            const worksheet = workbook.worksheets.get(0);

            // Accessing the Validations collection of the worksheet
            const validation = worksheet.validations.get(0);

            // Create your cell area.
            const cellArea = AsposeCells.CellArea.createCellArea("D5", "E7");

            // Adding the cell area to Validation
            validation.addArea(cellArea, false, false);

            // Save the output workbook and provide download link
            const outputData = workbook.save(SaveFormat.Xlsx);
            const blob = new Blob([outputData]);
            const downloadLink = document.getElementById('downloadLink');
            downloadLink.href = URL.createObjectURL(blob);
            downloadLink.download = 'ValidationsSample_out.xlsx';
            downloadLink.style.display = 'block';
            downloadLink.textContent = 'Download Modified Excel File';

            document.getElementById('result').innerHTML = '<p style="color: green;">Validation area added successfully! Click the download link to get the modified file.</p>';
        });
    </script>
</html>

源和输出的Excel文件已附上供参考。

源文件

输出文件

高级主题

数据筛选 如何在单元格中插入图片