Insert Sparkline with JavaScript via C++

Insert a sparkline

Sparkline is a tiny chart in a worksheet cell that provides a visual representation of data. Use sparklines to show trends in a series of values, such as seasonal increases or decreases, economic cycles, or to highlight maximum and minimum values. Position a sparkline near its data for greatest impact. There are three types of Sparkline: Line, Column and Stacked.

It’s simple to create a sparkline with Aspose.Cells for JavaScript via C++ with the following example codes:

<!DOCTYPE html>
<html>
    <head>
        <title>Aspose.Cells Example</title>
    </head>
    <body>
        <h1>Sparklines 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, SparklineType, Color } = 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');
            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 first worksheet in the Excel file
            const sheet = workbook.worksheets.get(0);
            
            // Put values into cells
            sheet.cells.get("A1").putValue(5);
            sheet.cells.get("B1").putValue(2);
            sheet.cells.get("C1").putValue(1);
            sheet.cells.get("D1").putValue(3);
            
            // Define the CellArea
            const ca = CellArea.createCellArea(0, 4, 0, 4);
            
            // Add a sparkline group
            const idx = sheet.sparklineGroups.add(SparklineType.Line, `${sheet.name}!A1:D1`, false, ca);
            
            const group = sheet.sparklineGroups.get(idx);
            group.sparklines.add(`${sheet.name}!A1:D1`, 0, 4);
            
            // Customize Sparklines
            const clr = workbook.createCellsColor();
            clr.color = Color.Orange;
            group.seriesColor = clr;
            
            // Set the high points are colored green and the low points are colored red
            group.showHighPoint = true;
            group.showLowPoint = true;
            group.highPointColor.color = Color.Green;
            group.lowPointColor.color = Color.Red;
            // Set line weight 
            group.lineWeight = 1.0;
            
            // Saving the Excel file and providing 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 = 'output.xlsx';
            downloadLink.style.display = 'block';
            downloadLink.textContent = 'Download Excel File';
            
            resultDiv.innerHTML = '<p style="color: green;">Sparklines created successfully! Click the download link to get the modified file.</p>';
        });
    </script>
</html>

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