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Data Label in JavaScript Accumulation Chart control

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>

DataLabel Rotation

Using angle property, you can rotate the data label by its given angle.

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, angle: 90, enableRotation: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: By default, when the enableRotation is true, the datalabel is rotated along the slice.

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>