Data label in EJ2 TypeScript Accumulation chart control

23 Jun 202324 minutes to read

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

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>
<script src="https://cdn.syncfusion.com/ej2/syncfusion-helper.js" type ="text/javascript"></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.

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>
<script src="https://cdn.syncfusion.com/ej2/syncfusion-helper.js" type ="text/javascript"></script>
</head>

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

</html>

Smart labels

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

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>
<script src="https://cdn.syncfusion.com/ej2/syncfusion-helper.js" type ="text/javascript"></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.

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>
<script src="https://cdn.syncfusion.com/ej2/syncfusion-helper.js" type ="text/javascript"></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

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>
<script src="https://cdn.syncfusion.com/ej2/syncfusion-helper.js" type ="text/javascript"></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.

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>
<script src="https://cdn.syncfusion.com/ej2/syncfusion-helper.js" type ="text/javascript"></script>
</head>

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

</html>

Format

Data label for the accumulation chart can be formatted using format property. You can use the global formatting options, such as ‘n’, ‘p’, and ‘c’.

import { AccumulationChart, AccumulationDataLabel, IAccTextRenderEventArgs } from '@syncfusion/ej2-charts';
AccumulationChart.Inject(AccumulationDataLabel);
let piechart: AccumulationChart = new AccumulationChart({
    series: [
        {
            dataSource: [{ x: 'Jan', y: 13, text: 'Jan: 3' },
                { x: 'Feb', y: 13, text: 'Feb: 3.5' },
                { x: 'Mar', y: 7, text: 'Mar: 7' },
                { x: 'Apr', y: 13, text: 'Apr: 13.5' }],
            xName: 'x',
            yName: 'y',
            dataLabel: { visible: true, format:'n2' }
        }
    ],
}, '#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>
<script src="https://cdn.syncfusion.com/ej2/syncfusion-helper.js" type ="text/javascript"></script>
</head>

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

</html>

Value Format Resultant Value Description
1000 n1 1000.0 The number is rounded to 1 decimal place.
1000 n2 1000.00 The number is rounded to 2 decimal places.
1000 n3 1000.000 The number is rounded to 3 decimal place.
0.01 p1 1.0% The number is converted to percentage with 1 decimal place.
0.01 p2 1.00% The number is converted to percentage with 2 decimal place.
0.01 p3 1.000% The number is converted to percentage with 3 decimal place.
1000 c1 $1000.0 The currency symbol is appended to number and number is rounded to 1 decimal place.
1000 c2 $1000.00 The currency symbol is appended to number and number is rounded to 2 decimal place.

Customization

Individual text can be customized using the textRender event.

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>
<script src="https://cdn.syncfusion.com/ej2/syncfusion-helper.js" type ="text/javascript"></script>
</head>

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

</html>

Text wrap

When the data label text exceeds the container, the text can be wrapped by using textWrap property. End user can also wrap the data label text based on maxWidth property.

import { AccumulationChart, AccumulationDataLabel } from '@syncfusion/ej2-charts';
AccumulationChart.Inject(AccumulationDataLabel);
let piechart: AccumulationChart = new AccumulationChart({
    enableSmartLabels: true,
      series: [
            {
                dataSource: [
                    { x: 'Chrome', y: 100, text: 'Chrome (100M)<br>40%', tooltipMappingName: '40%' },
                    { x: 'UC Browser', y: 40, text: 'UC Browser (40M)<br>16%', tooltipMappingName: '16%' },
                    { x: 'Opera', y: 30, text: 'Opera (30M)<br>12%', tooltipMappingName: '12%' },
                    { x: 'Safari', y: 30, text: 'Safari (30M)<br>12%', tooltipMappingName: '12%' },
                    { x: 'Firefox', y: 25, text: 'Firefox (25M)<br>10%', tooltipMappingName: '10%' },
                    { x: 'Others', y: 25, text: 'Others (25M)<br>10%', tooltipMappingName: '10%' }
                ],
                xName: 'x',
                yName: 'y',
                startAngle: 270,
                endAngle: 90,
                explode: true,radius : '100%',
                innerRadius: '40%', tooltipMappingName: 'tooltipMappingName',
                dataLabel: {
                    visible: true, position: 'Inside' ,maxWidth:100,textWrap:'Wrap',
                    name: 'text', 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>
<script src="https://cdn.syncfusion.com/ej2/syncfusion-helper.js" type ="text/javascript"></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..

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>
<script src="https://cdn.syncfusion.com/ej2/syncfusion-helper.js" type ="text/javascript"></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.

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>
<script src="https://cdn.syncfusion.com/ej2/syncfusion-helper.js" type ="text/javascript"></script>
</head>

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

</html>