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Markers

This section explains how to add markers to the sparkline.

Adding marker to the sparkline

To add marker to the sparkline, specify the visible of markerSettings as following values. The visible will accept multiple values too.

  • All - Enables markers for all points.
  • Start - Enables marker for the start point.
  • End - Enables marker for the end point.
  • High - Enables marker for the high point.
  • Low - Enables marker for the low point.
  • Negative - Enables markers for the negative points.

The following code example shows enabling markers 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
        }} dataSource={[0, 6, 4, 1, 3, 2, 5]} 
        // To enable markers for all points
        markerSettings={{
            visible: ['All']
        }}>
</SparklineComponent>);
    }
}
ReactDOM.render(<App />, document.getElementById('sparkline'));

Adding marker to special point

In sparkline, markers can be enabled for particular points such as the start, end, low, high, or negative. The following code examples shows enabling markers for the high and low 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
        }} dataSource={[3, 6, 4, 1, 3, 2, 5]} 
        // To enable marker for high and low points with color customization
        highPointColor='blue' lowPointColor='red' markerSettings={{
            visible: ['High', 'Low']
        }}>
</SparklineComponent>);
    }
}
ReactDOM.render(<App />, document.getElementById('sparkline'));

Customizing markers

Sparkline markers can be customized in terms of fill color, border color, width, opacity, and size. The following code example shows customizing marker’s fill, border, and size.

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
        }} dataSource={[3, 6, 4, 1, 3, 2, 5]} 
        // To enable marker for high and low points with color customization
        fill='blue' markerSettings={{
            visible: ['All'],
            size: 5, fill: 'white', border: { color: 'blue', width: 2 }
        }}>
</SparklineComponent>);
    }
}
ReactDOM.render(<App />, document.getElementById('sparkline'));
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