Markers in JavaScript Sparkline control

08 May 2023 / 2 minutes to read

This section explains how to add markers to the sparklines.

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.ts

index.html

import { Sparkline } from '@syncfusion/ej2-charts';

let sparkline: Sparkline = new 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']
}
});
sparkline.appendTo("#element");

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

<head>
            
    <title>Essential JS 2 for Sparkline </title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Essential JS 2 for Sparkline UI Control" />
    <meta name="author" content="Syncfusion" />
    <link href="index.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/21.2.3/ej2-charts/styles/material.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' style="margin-top: 15%;">
            <div id="element" align="center" ></div>
    </div>
</body>

</html>

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.ts

index.html

import { Sparkline } from '@syncfusion/ej2-charts';

 let sparkline: Sparkline = new 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']
}
});
sparkline.appendTo("#element");

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

<head>
            
    <title>Essential JS 2 for Sparkline </title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Essential JS 2 for Sparkline UI Control" />
    <meta name="author" content="Syncfusion" />
    <link href="index.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/21.2.3/ej2-charts/styles/material.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' style="margin-top: 15%;">
            <div id="element" align="center" ></div>
    </div>
</body>

</html>

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.ts

index.html

import { Sparkline } from '@syncfusion/ej2-charts';

 let sparkline: Sparkline = new 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}
}
});
sparkline.appendTo("#element");

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

<head>
            
    <title>Essential JS 2 for Sparkline </title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Essential JS 2 for Sparkline UI Control" />
    <meta name="author" content="Syncfusion" />
    <link href="index.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/21.2.3/ej2-charts/styles/material.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' style="margin-top: 15%;">
            <div id="element" align="center" ></div>
    </div>
</body>

</html>

Contents

Adding marker to the sparkline
Adding marker to special point
Customizing markers

Contents

Adding marker to the sparkline
Adding marker to special point
Customizing markers