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Data Label in JavaScript Accumulation Chart control

24 May 2022 / 5 minutes to read

Data label can be added to a chart series by enabling the visible option in the dataLabel property.

Source

Preview

index.ts

index.html

import { AccumulationChart, AccumulationDataLabel } from '@syncfusion/ej2-charts';
AccumulationChart.Inject(AccumulationDataLabel);
let piechart: AccumulationChart = new AccumulationChart({
    enableSmartLabels: true,
    series: [
        {
            dataSource: [{ x: 'Jan', y: 13, text: 'Jan: 3' }, { x: 'Feb', y: 13.5, text: 'Feb: 3.5' },
                { x: 'Mar', y: 7, text: 'Mar: 7' }, { x: 'Apr', y: 13.5, text: 'Apr: 13.5' }],
            xName: 'x',
            yName: 'y',
            dataLabel: { visible: true }
        }
    ]
}, '#element');

<!DOCTYPE html>
<html lang="en">

<head>
    <title>EJ2 Animation</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Typescript UI Controls" />
    <meta name="author" content="Syncfusion" />
    <link href="index.css" rel="stylesheet" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
</head>

<body>
    <div id='loader'>Loading....</div>
    <div id='container'>
        <div id='element'></div>
    </div>
</body>

</html>

Note: To use the data label feature, inject the DataLabel using the Chart.Inject(DataLabel) method.

Positioning

Accumulation chart provides support for placing the data label either inside or outside the chart.

Source

Preview

index.ts

index.html

import { AccumulationChart, AccumulationDataLabel } from '@syncfusion/ej2-charts';
import { labelData } from './datasource.ts';
AccumulationChart.Inject(AccumulationDataLabel);
let piechart: AccumulationChart = new AccumulationChart({
    series: [
        {
            dataSource: labelData,
            xName: 'x',
            yName: 'y',
            dataLabel: { visible: true, position:'Outside' }
        }
    ]
}, '#element');

<!DOCTYPE html>
<html lang="en">

<head>
    <title>EJ2 Animation</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Typescript UI Controls" />
    <meta name="author" content="Syncfusion" />
    <link href="index.css" rel="stylesheet" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
</head>

<body>
    <div id='loader'>Loading....</div>
    <div id='container'>
        <div id='element'></div>
    </div>
</body>

</html>

Smart labels

Datalabels will be arranged smartly without overlapping with each other. You can enable or disable this feature using the enableSmartLabels property.

Source

Preview

index.ts

index.html

import { AccumulationChart, AccumulationDataLabel } from '@syncfusion/ej2-charts';
AccumulationChart.Inject(AccumulationDataLabel);
let piechart: AccumulationChart = new AccumulationChart({
    enableSmartLabels: true,
    series: [
        {
            dataSource: [
                { x: 'Jan', y: 3, text: 'Jan: 3' }, { x: 'Feb', y: 3.5, text: 'Feb: 3.5' },
                { x: 'Mar', y: 7, text: 'Mar: 7' }, { x: 'Apr', y: 13.5, text: 'Apr: 13.5' },
                { x: 'May', y: 19, text: 'May: 19' }, { x: 'Jun', y: 23.5, text: 'Jun: 23.5' },
                { x: 'Jul', y: 26, text: 'Jul: 26' }, { x: 'Aug', y: 25, text: 'Aug: 25' },
                { x: 'Sep', y: 21, text: 'Sep: 21' }, { x: 'Oct', y: 15, text: 'Oct: 15' }],
            dataLabel: { visible: true, name: 'text', position: 'Outside' },
            xName: 'x',
            yName: 'y'
        }
    ]
}, '#element');

<!DOCTYPE html>
<html lang="en">

<head>
    <title>EJ2 Animation</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Typescript UI Controls" />
    <meta name="author" content="Syncfusion" />
    <link href="index.css" rel="stylesheet" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
</head>

<body>
    <div id='loader'>Loading....</div>
    <div id='container'>
        <div id='element'></div>
    </div>
</body>

</html>

Data Label Template

Label content can be formatted by using the template option. Inside the template, you can add the placeholder text ${point.x} and ${point.y} to display corresponding data points x & y value. Using templateproperty, you can set data label template in chart.

Source

Preview

index.ts

index.html

import { AccumulationChart, AccumulationDataLabel } from '@syncfusion/ej2-charts';
import { labelData } from './datasource.ts';
AccumulationChart.Inject(AccumulationDataLabel);
let piechart: AccumulationChart = new AccumulationChart({
    enableSmartLabels: true,
    series: [
        {
            dataSource: labelData,
            dataLabel: { visible: true, name: 'text', position: 'Inside',
                template:  "<div id='templateWrap' style='background-color:#bd18f9;border-radius: 3px; float: right;padding: 2px;line-height: 20px;text-align: center;'>"+ "<img src='https://ej2.syncfusion.com/demos/src/chart/images/sunny.png' />" + "<div style='color:white; font-family:Roboto; font-style: medium; fontp-size:14px;float: right;padding: 2px;line-height: 20px;text-align: center;padding-right:6px'><span>${point.y}</span></div></div>"
            },xName: 'x', yName: 'y'
        }]
}, '#element');

<!DOCTYPE html>
<html lang="en">

<head>
    <title>EJ2 Animation</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Typescript UI Controls" />
    <meta name="author" content="Syncfusion" />
    <link href="index.css" rel="stylesheet" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
</head>

<body>
    <div id='loader'>Loading....</div>
    <div id='container'>
        <div id='element'></div>
    </div>
</body>

</html>

Connector Line

Connector line will be visible when the data label is placed outside the chart. The connector line can be customized using the type, color, width, length and dashArray properties

Source

Preview

index.ts

index.html

import { AccumulationChart, AccumulationDataLabel } from '@syncfusion/ej2-charts';
import { labelData } from './datasource.ts';
AccumulationChart.Inject(AccumulationDataLabel);
let piechart: AccumulationChart = new AccumulationChart({
    enableSmartLabels: true,
    series: [
        {
            dataSource: labelData,
            dataLabel: { visible: true, name: 'text', position: 'Outside',
                connectorStyle:{
                    //Length of the connector line in pixels
                    length: '50px',
                    //Width of the connector line in pixels
                    width: 2,
                    //dashArray of the connector line
                    dashArray: '5,3',
                    //Color of the connector line
                    color: '#f4429e',
                    //Specifies the type of the connector line either Line or Curve
                    type: 'Curve'
                }
            }, xName: 'x', yName: 'y'}
    ]
}, '#element');

<!DOCTYPE html>
<html lang="en">

<head>
    <title>EJ2 Animation</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Typescript UI Controls" />
    <meta name="author" content="Syncfusion" />
    <link href="index.css" rel="stylesheet" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
</head>

<body>
    <div id='loader'>Loading....</div>
    <div id='container'>
        <div id='element'></div>
    </div>
</body>

</html>

Text Mapping

Text from the data source can be mapped to data label using name property.

Source

Preview

index.ts

index.html

import { AccumulationChart, AccumulationDataLabel  } from '@syncfusion/ej2-charts';
import { dataMapping } from './datasource.ts';
AccumulationChart.Inject(AccumulationDataLabel);

let piechart: AccumulationChart = new AccumulationChart({
    series: [
        {
            dataSource:dataMapping ,
            xName: 'x',
            yName: 'y',
            dataLabel: { visible: true, name:'text' }
        }
    ]
}, '#element');

<!DOCTYPE html>
<html lang="en">

<head>
    <title>EJ2 Animation</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Typescript UI Controls" />
    <meta name="author" content="Syncfusion" />
    <link href="index.css" rel="stylesheet" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
</head>

<body>
    <div id='loader'>Loading....</div>
    <div id='container'>
        <div id='element'></div>
    </div>
</body>

</html>

Customization

Individual text can be customized using the textRender event.

Source

Preview

index.ts

index.html

import { AccumulationChart, FunnelSeries, IAccTextRenderEventArgs, AccumulationDataLabel } from '@syncfusion/ej2-charts';
import { labelData } from './datasource.ts';
AccumulationChart.Inject(FunnelSeries, AccumulationDataLabel);
let accChart: AccumulationChart = new AccumulationChart({
   series: [
        {
            dataSource: labelData,
            dataLabel: { visible: true, name: 'text', position: 'Outside' },
            xName: 'x',
            yName: 'y'
        }
    ],

     textRender: (args: IAccTextRenderEventArgs) => {
        if (args.text.indexOf('Mar') > -1) {
            args.color = 'red';
            args.border.width = 1;
        }
    },
}, '#element');

<!DOCTYPE html>
<html lang="en">

<head>
    <title>EJ2 Animation</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Typescript UI Controls" />
    <meta name="author" content="Syncfusion" />
    <link href="index.css" rel="stylesheet" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
</head>

<body>
    <div id='loader'>Loading....</div>
    <div id='container'>
        <div id='element'></div>
    </div>
</body>

</html>

Show percentages in data labels of pie chart

You can show the percentages in data labels of pie chart using textRender event and template option.

Using textRender event

You can customize the data label of pie chart using textRender event as follows to show percentage..

Source

Preview

index.ts

index.html

import { AccumulationChart, AccumulationDataLabel, IAccTextRenderEventArgs } from '@syncfusion/ej2-charts';
AccumulationChart.Inject(AccumulationDataLabel);
let piechart: AccumulationChart = new AccumulationChart({
    enableSmartLabels: true,
    series: [
        {
            dataSource: [{ x: 'Jan', y: 13, text: 'Jan: 3' }, { x: 'Feb', y: 13.5, text: 'Feb: 3.5' },
                { x: 'Mar', y: 7, text: 'Mar: 7' }, { x: 'Apr', y: 13.5, text: 'Apr: 13.5' }],
            xName: 'x',
            yName: 'y',
            dataLabel: { visible: true }
        }
    ],
    textRender: (args: IAccTextRenderEventArgs) => {
        args.text = args.point.percentage + "%";
    }
}, '#element');

<!DOCTYPE html>
<html lang="en">

<head>
    <title>EJ2 Animation</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Typescript UI Controls" />
    <meta name="author" content="Syncfusion" />
    <link href="index.css" rel="stylesheet" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
</head>

<body>
    <div id='loader'>Loading....</div>
    <div id='container'>
        <div id='element'></div>
    </div>
</body>

</html>

Using template

You can display the percentage values in data label of pie chart using template option.

Source

Preview

index.ts

index.html

import { AccumulationChart, AccumulationDataLabel, IAccTextRenderEventArgs } from '@syncfusion/ej2-charts';
AccumulationChart.Inject(AccumulationDataLabel);
let piechart: AccumulationChart = new AccumulationChart({
    enableSmartLabels: true,
    series: [
        {
            dataSource: [{ x: 'Jan', y: 13, text: 'Jan: 3' }, { x: 'Feb', y: 13.5, text: 'Feb: 3.5' },
                { x: 'Mar', y: 7, text: 'Mar: 7' }, { x: 'Apr', y: 13.5, text: 'Apr: 13.5' }],
            xName: 'x',
            yName: 'y',
            dataLabel: { visible: true, template: "<div id='dataLabelTemplate'>${point.percentage}%</div>" }
        }
    ],
}, '#element');

<!DOCTYPE html>
<html lang="en">

<head>
    <title>EJ2 Animation</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Typescript UI Controls" />
    <meta name="author" content="Syncfusion" />
    <link href="index.css" rel="stylesheet" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
</head>

<body>
    <div id='loader'>Loading....</div>
    <div id='container'>
        <div id='element'></div>
    </div>
</body>

</html>

Contents

Positioning
Smart labels
Data Label Template
Connector Line
Text Mapping
Customization
Show percentages in data labels of pie chart
Using textRender event
Using template

Contents

Positioning
Smart labels
Data Label Template
Connector Line
Text Mapping
Customization
Show percentages in data labels of pie chart
Using textRender event
Using template