Adding Custom Labels to Data Points in the Series of the Chart with Node.js via C++

You can add custom labels to data points in the series of the chart. Aspose.Cells provides DataLabels.getText() property to add these custom labels. This article will explain how to use this property to add custom labels to data points in the series of the chart.

The following code creates Scatter Chart Connected By Lines With Data Markers and then adds Custom Labels to the Data Points in the Series of the Chart. Each custom label shows the Series Name and Point Name. You can use any other text instead of it.

const path = require("path");
const AsposeCells = require("aspose.cells.node");

// The path to the documents directory.
const dataDir = path.join(__dirname, "data");
const filePath = path.join(dataDir, "sample.xlsx");
// Loads the workbook which contains hidden external links
const workbook = new AsposeCells.Workbook(filePath);
const sheet = workbook.getWorksheets().get(0);

// Put data
sheet.getCells().get(0, 0).putValue(1);
sheet.getCells().get(0, 1).putValue(2);
sheet.getCells().get(0, 2).putValue(3);

sheet.getCells().get(1, 0).putValue(4);
sheet.getCells().get(1, 1).putValue(5);
sheet.getCells().get(1, 2).putValue(6);

sheet.getCells().get(2, 0).putValue(7);
sheet.getCells().get(2, 1).putValue(8);
sheet.getCells().get(2, 2).putValue(9);

// Generate the chart
const chartIndex = sheet.getCharts().add(AsposeCells.ChartType.ScatterConnectedByLinesWithDataMarker, 5, 1, 24, 10);
const chart = sheet.getCharts().get(chartIndex);

chart.getTitle().setText("Test");
chart.getCategoryAxis().getTitle().setText("X-Axis");
chart.getValueAxis().getTitle().setText("Y-Axis");

chart.getNSeries().setCategoryData("A1:C1");

// Insert series
chart.getNSeries().add("A2:C2", false);

let series = chart.getNSeries().get(0);

let pointCount = series.getPoints().getCount();
for (let i = 0; i < pointCount; i++) {
const pointIndex = series.getPoints().get(i);
pointIndex.getDataLabels().setText("Series 1" + "\n" + "Point " + i);
}

// Insert series
chart.getNSeries().add("A3:C3", false);

series = chart.getNSeries().get(1);

pointCount = series.getPoints().getCount();
for (let i = 0; i < pointCount; i++) {
const pointIndex = series.getPoints().get(i);
pointIndex.getDataLabels().setText("Series 2" + "\n" + "Point " + i);
}

workbook.save(path.join(dataDir, "output_out.xlsx"), AsposeCells.SaveFormat.Xlsx);