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Data labels in React Sparkline component

Data labels are used to display values of data points to improve the readability.

Enable data label

To enable data label for sparkline series, provide visible of the dataLabelSettings as following possible values:

  • All - Enables data label of all points.
  • Start - Enables data label of the start point.
  • End - Enables data label of the end point.
  • High - Enables data label of the high point.
  • Low - Enables data label of the low point.
  • Negative - Enables data labels of the negative points.

The following example shows enabling sparkline data label for all points.

Source
Preview
index.html
index.jsx
<!DOCTYPE html>
<html lang="en">

<head>
    <title>Syncfusion React Chart-Category Axis</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Essential JS 2 for React Components" />
    <meta name="author" content="Syncfusion" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
     <style>
        #loader {
            color: #008cff;
            height: 40px;
            left: 45%;
            position: absolute;
            top: 45%;
            width: 30%;
        }
        #sparkline {
            height : 350px;
            display: block;
        }
    </style>
</head>

<body>
        <div id='sparkline'>
            <div id='loader'>Loading....</div>
        </div>
</body>
</html>
import * as React from 'react';
import * as ReactDOM from "react-dom";
import { SparklineComponent } from '@syncfusion/ej2-react-charts';
class App extends React.Component {
    render() {
        return (<SparklineComponent id='sparkline' height='200px' width='350px' axisSettings={{
            minX: -1, maxX: 7, maxY: 7, minY: -1
        }} fill='blue' dataSource={[0, 6, 4, 1, 3, 2, 5]} 
        // To enable data label for all points
        dataLabelSettings={{
            visible: ['All']
        }}>
</SparklineComponent>);
    }
}
ReactDOM.render(<App />, document.getElementById('sparkline'));

Customize data label

Data labels can be customized using the fill, border, opacity, and textStyle. The following code example shows customizing data label border, text color, and fill color.

Source
Preview
index.html
index.jsx
<!DOCTYPE html>
<html lang="en">

<head>
    <title>Syncfusion React Chart-Category Axis</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Essential JS 2 for React Components" />
    <meta name="author" content="Syncfusion" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
     <style>
        #loader {
            color: #008cff;
            height: 40px;
            left: 45%;
            position: absolute;
            top: 45%;
            width: 30%;
        }
        #sparkline {
            height : 350px;
            display: block;
        }
    </style>
</head>

<body>
        <div id='sparkline'>
            <div id='loader'>Loading....</div>
        </div>
</body>
</html>
import * as React from 'react';
import * as ReactDOM from "react-dom";
import { SparklineComponent } from '@syncfusion/ej2-react-charts';
class App extends React.Component {
    render() {
        return (<SparklineComponent id='sparkline' height='200px' width='350px' axisSettings={{
            minX: -1, maxX: 7, maxY: 7, minY: -1
        }} fill='blue' dataSource={[0, 6, 4, 1, 3, 2, 5]} 
        // To customize data label fill, border, and text color
        dataLabelSettings={{
            visible: ['All'],
            border: { color: 'blue', width: 1 },
            fill: 'blue', opacity: 0.4,
            textStyle: {
                color: 'white'
            }
        }}>
</SparklineComponent>);
    }
}
ReactDOM.render(<App />, document.getElementById('sparkline'));

Format data label text

The text of data labels can be formatted using the format API in the sparkline dataLabelSettings. By default, data label shows the y-value of point. The following code example shows how to display x and y-values for points.

Source
Preview
index.html
index.jsx
<!DOCTYPE html>
<html lang="en">

<head>
    <title>Syncfusion React Chart-Category Axis</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Essential JS 2 for React Components" />
    <meta name="author" content="Syncfusion" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
     <style>
        #loader {
            color: #008cff;
            height: 40px;
            left: 45%;
            position: absolute;
            top: 45%;
            width: 30%;
        }
        #sparkline {
            height : 350px;
            display: block;
        }
    </style>
</head>

<body>
        <div id='sparkline'>
            <div id='loader'>Loading....</div>
        </div>
</body>
</html>
import * as React from 'react';
import * as ReactDOM from "react-dom";
import { SparklineComponent } from '@syncfusion/ej2-react-charts';
class App extends React.Component {
    render() {
        return (<SparklineComponent id='sparkline' height='200px' width='500px' axisSettings={{
            minX: -1, maxX: 7, maxY: 7, minY: -1
        }} fill='blue' valueType='Category' xName='x' yName='y' dataSource={[
            { x: 'Mon', y: 3 },
            { x: 'Tue', y: 5 },
            { x: 'Wed', y: 2 },
            { x: 'Thu', y: 4 },
            { x: 'Fri', y: 6 },
        ]} 
        // To enable data label for all points
        dataLabelSettings={{
            format: '${x} : ${y}',
            visible: ['All'],
            border: { color: 'blue', width: 1 },
            fill: 'blue', opacity: 0.4,
            textStyle: {
                color: 'white'
            }
        }}>
</SparklineComponent>);
    }
}
ReactDOM.render(<App />, document.getElementById('sparkline'));
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