Protect and Unprotect Worksheet with JavaScript via C++

To prevent other users from accidentally or deliberately changing, moving, or deleting data in a worksheet, you can lock the cells on your Excel worksheet and then protect the sheet with a password.

Protect and unprotect Worksheet in MS Excel

Click Review > Protect Worksheet.
Enter a password in the Password box.
Select allow options.
Select OK, re-enter the password to confirm it, and then select OK again.

Protect Worksheet Using Aspose.Cells for JavaScript via C++

Only need the following simple lines of code to implement protecting workbook structure of Excel files.

<!DOCTYPE html>
<html>
    <head>
        <title>Aspose.Cells Example</title>
    </head>
    <body>
        <h1>Aspose.Cells Protect Worksheet 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, ProtectionType } = 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 file (workbook)
            const workbook = new Workbook();
            
            // Gets the first worksheet.
            const sheet = workbook.worksheets.get(0);
            
            // Protect contents of the worksheet.
            sheet.protect(ProtectionType.Contents);
            
            // Protect worksheet with password.
            sheet.protection.password = "test";
            
            // Save as Excel file 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 = 'Book1.xlsx';
            downloadLink.style.display = 'block';
            downloadLink.textContent = 'Download Excel File';
            
            document.getElementById('result').innerHTML = '<p style="color: green;">Worksheet protected and file is ready. Click the download link to get the file.</p>';
        });
    </script>
</html>

Unprotect Worksheet Using Aspose.Cells for JavaScript via C++

Unprotecting the worksheet is easy with Aspose.Cells API. If the worksheet is password-protected, a correct password is required.

<!DOCTYPE html>
<html>
    <head>
        <title>Aspose.Cells Unprotect Worksheet Example</title>
    </head>
    <body>
        <h1>Unprotect Worksheet Example</h1>
        <input type="file" id="fileInput" accept=".xls,.xlsx,.csv" />
        <button id="runExample">Unprotect Worksheet</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, Utils } = 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();
            
            // Instantiate Workbook from uploaded file
            const workbook = new Workbook(new Uint8Array(arrayBuffer));
            
            // Access the first worksheet
            const sheet = workbook.worksheets.get(0);
            
            // Unprotect contents of the worksheet using password
            sheet.unprotect("password");
            
            // Save the modified workbook to XLSX format 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 = 'Book1.unprotected.xlsx';
            downloadLink.style.display = 'block';
            downloadLink.textContent = 'Download Unprotected Excel File';
            
            document.getElementById('result').innerHTML = '<p style="color: green;">Worksheet unprotected successfully! Click the download link to get the modified file.</p>';
        });
    </script>
</html>

Advance topics

Password Protect or Unprotect the Shared Workbook with JavaScript via C++ Encrypting Excel Files with JavaScript via C++