# Customize Chart Data Tables in Presentations Using JavaScript

> Customize chart data tables in JavaScript for PPT and PPTX with Aspose.Slides for Node.js via Java to boost efficiency and appeal in presentations.

Source: https://docs.aspose.com/slides/nodejs-java/chart-data-table/
Updated: 2026-08-05


## **Overview**

This article explains how to work with chart data tables in Aspose.Slides. It shows how to display a data table for a chart and customize its text formatting by setting font properties such as bold style and font height. The example demonstrates loading a presentation, adding a chart, enabling the chart data table, applying font settings, and saving the updated presentation.

It also includes brief answers to common questions about showing legend keys in a chart data table, preserving the data table during export, working with charts loaded from existing presentations or templates, and identifying charts where the data table is enabled.

## **Set Font Properties for Chart Data Table**

Aspose.Slides for Node.js via Java provides support for changing color of categories in a series color. 

1. Instantiate [Presentation](https://reference.aspose.com/slides/nodejs-java/aspose.slides/Presentation) class object.
1. Add chart on the slide.
1. set chart table.
1. Set font height.
1. Save modified presentation.

 Below sample example is given. 

```javascript
var aspose = aspose || {};
aspose.slides = require("aspose.slides.via.java");
const java = require("java");

// Creating empty presentation
var pres = new aspose.slides.Presentation();
try {
    var chart = pres.getSlides().get_Item(0).getShapes().addChart(aspose.slides.ChartType.ClusteredColumn, 50, 50, 600, 400);
    chart.setDataTable(true);
    chart.getChartDataTable().getTextFormat().getPortionFormat().setFontBold(java.newByte(aspose.slides.NullableBool.True));
    chart.getChartDataTable().getTextFormat().getPortionFormat().setFontHeight(20);
    pres.save("output.pptx", aspose.slides.SaveFormat.Pptx);
} finally {
    if (pres != null) {
        pres.dispose();
    }
}
```

## **FAQ**

### Can I show small legend keys next to the values in the chart’s data table?

Yes. The data table supports [legend keys](https://reference.aspose.com/slides/nodejs-java/aspose.slides/datatable/setshowlegendkey/), and you can turn them on or off.

### Will the data table be preserved when exporting the presentation to PDF, HTML, or images?

Yes. Aspose.Slides renders the chart as part of the slide, so the exported [PDF](/slides/nodejs-java/convert-powerpoint-to-pdf/)/[HTML](/slides/nodejs-java/convert-powerpoint-to-html/)/[image](/slides/nodejs-java/convert-powerpoint-to-png/) includes the chart with its data table.

### Are data tables supported for charts that come from a template file?

Yes. For any chart loaded from an existing presentation or template, you can check and change whether a data table [is shown](https://reference.aspose.com/slides/nodejs-java/aspose.slides/chart/hasdatatable/) using the chart’s properties.

### How can I quickly find which charts in a file have the data table enabled?

Inspect each chart’s property that indicates whether the data table [is shown](https://reference.aspose.com/slides/nodejs-java/aspose.slides/chart/hasdatatable/) and iterate through the slides to identify the charts where it is enabled.