Marker in EJ2 JavaScript Sparkline control

18 Apr 20238 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.

//Initialize Sparkline component
var sparklineInstance = new ej.charts.Sparkline({
    height: '200px',
    width: '350px',
    axisSettings: {
        minX: -1, maxX: 7, maxY: 7, minY: -1
    },
    dataSource: [0, 6, 4, 1, 3, 2, 5],
    markerSettings: {
        visible: ['All']
    }
});
//Render initialized Sparkline
sparklineInstance.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="https://cdn.syncfusion.com/ej2/23.2.4/ej2-charts/styles/material.css" rel="stylesheet">
    
    
<script src="https://cdn.syncfusion.com/ej2/23.2.4/dist/ej2.min.js" type="text/javascript"></script>
<script src="https://cdn.syncfusion.com/ej2/syncfusion-helper.js" type ="text/javascript"></script>
</head>

<body>
    
    <div id="container" style="margin-top: 15%;">
            <div id="element" align="center"></div>
    </div>


<script>
var ele = document.getElementById('container');
if(ele) {
  ele.style.visibility = "visible";
}   
      </script>
<script src="index.js" type="text/javascript"></script>
</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.

//Initialize Sparkline component
var sparklineInstance = new ej.charts.Sparkline({
    height: '200px',
    width: '350px',
    axisSettings: {
        minX: -1, maxX: 7, maxY: 7, minY: -1
    },
    dataSource:   [3, 6, 4, 1, 3, 2, 5],
    highPointColor: 'blue',
    lowPointColor: 'red',
    markerSettings: {
        visible: ['High', 'Low']
    }
});
//Render initialized Sparkline
sparklineInstance.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="https://cdn.syncfusion.com/ej2/23.2.4/ej2-charts/styles/material.css" rel="stylesheet">
    
    
<script src="https://cdn.syncfusion.com/ej2/23.2.4/dist/ej2.min.js" type="text/javascript"></script>
<script src="https://cdn.syncfusion.com/ej2/syncfusion-helper.js" type ="text/javascript"></script>
</head>

<body>
    
    <div id="container" style="margin-top: 15%;">
            <div id="element" align="center"></div>
    </div>


<script>
var ele = document.getElementById('container');
if(ele) {
  ele.style.visibility = "visible";
}   
      </script>
<script src="index.js" type="text/javascript"></script>
</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.

//Initialize Sparkline component
var sparklineInstance = new ej.charts.Sparkline({
    height: '200px',
    width: '350px',
    axisSettings: {
        minX: -1, maxX: 7, maxY: 7, minY: -1
    },
    dataSource:   [3, 6, 4, 1, 3, 2, 5],
    fill: 'blue',
    markerSettings: {
        visible: ['All'],
        size: 5, fill: 'white', border: { color: 'blue', width: 2}
    }
});
//Render initialized Sparkline
sparklineInstance.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="https://cdn.syncfusion.com/ej2/23.2.4/ej2-charts/styles/material.css" rel="stylesheet">
    
    
<script src="https://cdn.syncfusion.com/ej2/23.2.4/dist/ej2.min.js" type="text/javascript"></script>
<script src="https://cdn.syncfusion.com/ej2/syncfusion-helper.js" type ="text/javascript"></script>
</head>

<body>
    
    <div id="container" style="margin-top: 15%;">
            <div id="element" align="center"></div>
    </div>


<script>
var ele = document.getElementById('container');
if(ele) {
  ele.style.visibility = "visible";
}   
      </script>
<script src="index.js" type="text/javascript"></script>
</body></html>