Set Data source for the chart with Node.js via C++
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In our previous topics, we have already provided many examples to demonstrate how you can set a data source for your chart but in this topic, we are going to provide more details about the types of data that can be set for a chart.
Setting Chart Data
There are two types of data to deal with while working on charts using Aspose.Cells as follows:
- Chart data.
- Category data.
Chart Data
Chart data is the data that we use as a data source to build our charts. We can add a range of the cells (containing chart data) by calling the SeriesCollection object’s add(string, boolean) method.
const path = require("path");
const AsposeCells = require("aspose.cells.node");
// The path to the documents directory.
const dataDir = path.join(__dirname, "data");
// Instantiating a Workbook object
const workbook = new AsposeCells.Workbook();
// Adding a new worksheet to the Excel object
const sheetIndex = workbook.getWorksheets().add();
// Obtaining the reference of the newly added worksheet by passing its sheet index
const worksheet = workbook.getWorksheets().get(sheetIndex);
// Adding sample values to cells
worksheet.getCells().get("A1").putValue(50);
worksheet.getCells().get("A2").putValue(100);
worksheet.getCells().get("A3").putValue(170);
worksheet.getCells().get("A4").putValue(300);
worksheet.getCells().get("B1").putValue(160);
worksheet.getCells().get("B2").putValue(32);
worksheet.getCells().get("B3").putValue(50);
worksheet.getCells().get("B4").putValue(40);
// Adding sample values to cells as category data
worksheet.getCells().get("C1").putValue("Q1");
worksheet.getCells().get("C2").putValue("Q2");
worksheet.getCells().get("C3").putValue("Y1");
worksheet.getCells().get("C4").putValue("Y2");
// Adding a chart to the worksheet
const chartIndex = worksheet.getCharts().add(AsposeCells.ChartType.Column, 5, 0, 15, 5);
// Accessing the instance of the newly added chart
const chart = worksheet.getCharts().get(chartIndex);
// Adding SeriesCollection (chart data source) to the chart ranging from "A1" cell to "B4"
chart.getNSeries().add("A1:B4", true);
// Saving the Excel file
workbook.save(path.join(dataDir, "output.xls"));
Category Data
Category data is used for the labeling of chart data and can be added to SeriesCollection by using its getCategoryData() property. A complete example is given below to demonstrate the use of chart and category data. After executing the above example code, a column chart will be added to the worksheet as shown below.
const path = require("path");
const AsposeCells = require("aspose.cells.node");
// The path to the documents directory.
const dataDir = path.join(__dirname, "data");
// Instantiating a Workbook object
const workbook = new AsposeCells.Workbook();
// Adding a new worksheet to the Excel object
const sheetIndex = workbook.getWorksheets().add();
// Obtaining the reference of the newly added worksheet by passing its sheet index
const worksheet = workbook.getWorksheets().get(sheetIndex);
// Adding sample values to cells
worksheet.getCells().get("A1").putValue(10);
worksheet.getCells().get("A2").putValue(100);
worksheet.getCells().get("A3").putValue(170);
worksheet.getCells().get("A4").putValue(200);
worksheet.getCells().get("B1").putValue(120);
worksheet.getCells().get("B2").putValue(320);
worksheet.getCells().get("B3").putValue(50);
worksheet.getCells().get("B4").putValue(40);
// Adding sample values to cells as category data
worksheet.getCells().get("C1").putValue("Q1");
worksheet.getCells().get("C2").putValue("Q2");
worksheet.getCells().get("C3").putValue("Y1");
worksheet.getCells().get("C4").putValue("Y2");
// Adding a chart to the worksheet
const chartIndex = worksheet.getCharts().add(AsposeCells.ChartType.Column, 5, 0, 15, 5);
// Accessing the instance of the newly added chart
const chart = worksheet.getCharts().get(chartIndex);
// Adding SeriesCollection (chart data source) to the chart ranging from "A1" cell to "B4"
chart.getNSeries().add("A1:B4", true);
// Setting the data source for the category data of SeriesCollection
chart.getNSeries().setCategoryData("C1:C4");
// Saving the Excel file
workbook.save(path.join(dataDir, "output.xls"));