Get Equation Text of Chart Trendline with JavaScript via C++

You can retrieve the Equation Text of Chart Trendline using Aspose.Cells for JavaScript via C++. Aspose.Cells provides DataLabels.text property which returns the Equation Text of chart trendline. To make use of this property, you will first have to call Chart.calculate() method.

The following screenshot shows the Chart with a Trendline and its Equation Text is shown in Red color. We will retrieve this text using the DataLabels.text property in the following sample code.

todo:image_alt_text

JavaScript code to get equation text of chart trendline

<!DOCTYPE html>
<html>
    <head>
        <title>Aspose.Cells Example</title>
    </head>
    <body>
        <h1>Read Trendline Equation 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 the first worksheet
            const worksheet = workbook.worksheets.get(0);

            // Access the first chart inside the worksheet
            const chart = worksheet.charts.get(0);

            // Calculate the Chart to get the Equation Text of Trendline
            chart.calculate();

            // Access the Trendline
            const trendLine = chart.nSeries.get(0).trendLines.get(0);

            // Read the Equation Text of Trendline
            const equationText = trendLine.dataLabels.text;

            document.getElementById('result').innerHTML = `<p>Equation Text: ${equationText}</p>`;
        });
    </script>
</html>

Output generated by the sample code

This is the console output of the above sample code.

Equation Text: y = 8.1333x + 5

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