Set Default Font while rendering spreadsheet to HTML with JavaScript via C++

Aspose.Cells allows you to set default font while rendering spreadsheet to HTML. Please use the HtmlSaveOptions.defaultFontName for this purpose. This property is useful when there are some cells in a spreadsheet that have invalid or non-existing fonts. Then those cells will be rendered in a font specified with the HtmlSaveOptions.defaultFontName property.

Set Default Font while rendering spreadsheet to HTML

The following sample code creates a workbook and adds some text in cell B4 of the first worksheet and sets its font to some unknown/non-existing font. Then it saves the workbook in HTML by setting different default font names like Courier New, Arial, Times New Roman, etc.

The screenshot shows the effect of setting different default font names via HtmlSaveOptions.defaultFontName property.

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The code generates the output HTML file with Courier New, the output HTML with Arial, and the output HTML file with Times New Roman.

Sample Code

<!DOCTYPE html>
<html>
    <head>
        <title>Aspose.Cells Example</title>
    </head>
    <body>
        <h1>Aspose.Cells Example</h1>
        <input type="file" id="fileInput" accept=".xls,.xlsx,.csv" />
        <button id="runExample">Run Example</button>
        <a id="downloadLink1" style="display: none;">Download Result 1</a><br/>
        <a id="downloadLink2" style="display: none;">Download Result 2</a><br/>
        <a id="downloadLink3" style="display: none;">Download Result 3</a>
        <div id="result"></div>
    </body>

    <script src="aspose.cells.js.min.js"></script>
    <script type="text/javascript">
        const { Workbook, SaveFormat, HtmlSaveOptions, 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 () => {
            // Creating a new workbook and accessing first worksheet.
            const wb = new Workbook();
            const ws = wb.worksheets.get(0);

            // Access cell B4 and add some text inside it.
            const cell = ws.cells.get("B4");
            cell.value = "This text has some unknown or invalid font which does not exist.";

            // Set the font of cell B4 which is unknown.
            const st = cell.style;
            st.font.name = "UnknownNotExist";
            st.font.size = 20;
            cell.style = st;

            // Prepare HtmlSaveOptions and save three variants with different default fonts.
            const opts = new HtmlSaveOptions();

            // 1) Default font Courier New
            opts.defaultFontName = "Courier New";
            const outputData1 = wb.save(SaveFormat.Html, opts);
            const blob1 = new Blob([outputData1], { type: "text/html" });
            const downloadLink1 = document.getElementById('downloadLink1');
            downloadLink1.href = URL.createObjectURL(blob1);
            downloadLink1.download = 'out_courier_new_out.htm';
            downloadLink1.style.display = 'block';
            downloadLink1.textContent = 'Download out_courier_new_out.htm';

            // 2) Default font Arial
            opts.defaultFontName = "Arial";
            const outputData2 = wb.save(SaveFormat.Html, opts);
            const blob2 = new Blob([outputData2], { type: "text/html" });
            const downloadLink2 = document.getElementById('downloadLink2');
            downloadLink2.href = URL.createObjectURL(blob2);
            downloadLink2.download = 'out_arial_out.htm';
            downloadLink2.style.display = 'block';
            downloadLink2.textContent = 'Download out_arial_out.htm';

            // 3) Default font Times New Roman
            opts.defaultFontName = "Times New Roman";
            const outputData3 = wb.save(SaveFormat.Html, opts);
            const blob3 = new Blob([outputData3], { type: "text/html" });
            const downloadLink3 = document.getElementById('downloadLink3');
            downloadLink3.href = URL.createObjectURL(blob3);
            downloadLink3.download = 'times_new_roman_out.htm';
            downloadLink3.style.display = 'block';
            downloadLink3.textContent = 'Download times_new_roman_out.htm';

            document.getElementById('result').innerHTML = '<p style="color: green;">Files generated successfully. Click the download links above to save the HTML files.</p>';
        });
    </script>
</html>

Enable CSS Custom Properties while saving to HTML with JavaScript via C++