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Bubble Chart in EJ2 JavaScript Charts

3 Feb 202624 minutes to read

Bubble

To render a bubble series in your chart, you need to follow a few steps to configure it correctly. Here’s a concise guide on how to do this:

  • Set the series type: Define the series type as Bubble in your chart configuration. This indicates that the data should be displayed as a bubble series in the chart.
var bubbleData = [
    { x: 92.2, y: 7.8,  size: 1.347 },
    { x: 74,   y: 6.5,  size: 1.241 },
    { x: 90.4, y: 6.0,  size: 0.238 },
    { x: 99.4, y: 2.2,  size: 0.312 },
    { x: 88.6, y: 1.3,  size: 0.197 },
    { x: 99,   y: 0.7,  size: 0.0818 },
    { x: 72,   y: 2.0,  size: 0.0826 },
    { x: 99.6, y: 3.4,  size: 0.143 },
    { x: 99,   y: 0.2,  size: 0.128 },
    { x: 86.1, y: 4.0,  size: 0.115 },
    { x: 92.6, y: 6.6,  size: 0.096 },
    { x: 61.3, y: 14.5, size: 0.162 }
]
var chart = new ej.charts.Chart({
    primaryXAxis: {
        title: 'Literacy Rate',
        minimum: 60,
        maximum: 100,
        interval: 5
    },
    primaryYAxis: {
        title: 'GDP growth rate',
        minimum: -2,
        maximum: 16,
        interval: 2
    },
    series: [
        {
            type: 'Bubble',
            dataSource: bubbleData,
            xName: 'x', yName: 'y', 
            size: 'size'
        }
    ],
    title: 'GDP vs Literacy Rate'
}, '#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://cdn.syncfusion.com/ej2/33.1.44/dist/ej2.min.js" type="text/javascript"></script>
</head>

<body>
    <div id="container">
        <div id="element"></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>

Binding data with series

You can bind data to the chart using the dataSource property within the series configuration. This allows you to connect a JSON dataset or remote data to your chart. To display the data correctly, map the fields from the data to the chart series xName and yName properties.

var bubbleData = [
    { x: 92.2, y: 7.8,  size: 1.347 },
    { x: 74,   y: 6.5,  size: 1.241 },
    { x: 90.4, y: 6.0,  size: 0.238 },
    { x: 99.4, y: 2.2,  size: 0.312 },
    { x: 88.6, y: 1.3,  size: 0.197 },
    { x: 99,   y: 0.7,  size: 0.0818 },
    { x: 72,   y: 2.0,  size: 0.0826 },
    { x: 99.6, y: 3.4,  size: 0.143 },
    { x: 99,   y: 0.2,  size: 0.128 },
    { x: 86.1, y: 4.0,  size: 0.115 },
    { x: 92.6, y: 6.6,  size: 0.096 },
    { x: 61.3, y: 14.5, size: 0.162 }
]
var chart = new ej.charts.Chart({
    primaryXAxis: {
        title: 'Literacy Rate',
        minimum: 60,
        maximum: 100,
        interval: 5
    },
    primaryYAxis: {
        title: 'GDP growth rate',
        minimum: -2,
        maximum: 16,
        interval: 2
    },
    series: [
        {
            type: 'Bubble',
            dataSource: bubbleData,
            xName: 'x', yName: 'y', 
            size: 'size'
        }
    ],
    title: 'GDP vs Literacy Rate'
}, '#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://cdn.syncfusion.com/ej2/33.1.44/dist/ej2.min.js" type="text/javascript"></script>
</head>

<body>
    <div id="container">
        <div id="element"></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>

Series customization

The following properties can be used to customize the bubble series.

Fill

The fill property determines the color applied to the series.

var bubbleData = [
    { x: 92.2, y: 7.8,  size: 1.347 },
    { x: 74,   y: 6.5,  size: 1.241 },
    { x: 90.4, y: 6.0,  size: 0.238 },
    { x: 99.4, y: 2.2,  size: 0.312 },
    { x: 88.6, y: 1.3,  size: 0.197 },
    { x: 99,   y: 0.7,  size: 0.0818 },
    { x: 72,   y: 2.0,  size: 0.0826 },
    { x: 99.6, y: 3.4,  size: 0.143 },
    { x: 99,   y: 0.2,  size: 0.128 },
    { x: 86.1, y: 4.0,  size: 0.115 },
    { x: 92.6, y: 6.6,  size: 0.096 },
    { x: 61.3, y: 14.5, size: 0.162 }
]
var chart = new ej.charts.Chart({
    primaryXAxis: {
        title: 'Literacy Rate',
        minimum: 60,
        maximum: 100,
        interval: 5
    },
    primaryYAxis: {
        title: 'GDP growth rate',
        minimum: -2,
        maximum: 16,
        interval: 2
    },
    series: [
        {
            type: 'Bubble',
            dataSource: bubbleData,
            xName: 'x', yName: 'y', 
            size: 'size', fill: 'blue'
        }
    ],
    title: 'GDP vs Literacy Rate'
}, '#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://cdn.syncfusion.com/ej2/33.1.44/dist/ej2.min.js" type="text/javascript"></script>
</head>

<body>
    <div id="container">
        <div id="element"></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>

Opacity

The opacity property controls the transparency of the fill and affects how the series blends with background or overlapping series.

var bubbleData = [
    { x: 92.2, y: 7.8,  size: 1.347 },
    { x: 74,   y: 6.5,  size: 1.241 },
    { x: 90.4, y: 6.0,  size: 0.238 },
    { x: 99.4, y: 2.2,  size: 0.312 },
    { x: 88.6, y: 1.3,  size: 0.197 },
    { x: 99,   y: 0.7,  size: 0.0818 },
    { x: 72,   y: 2.0,  size: 0.0826 },
    { x: 99.6, y: 3.4,  size: 0.143 },
    { x: 99,   y: 0.2,  size: 0.128 },
    { x: 86.1, y: 4.0,  size: 0.115 },
    { x: 92.6, y: 6.6,  size: 0.096 },
    { x: 61.3, y: 14.5, size: 0.162 }
]
var chart = new ej.charts.Chart({
    primaryXAxis: {
        title: 'Literacy Rate',
        minimum: 60,
        maximum: 100,
        interval: 5
    },
    primaryYAxis: {
        title: 'GDP growth rate',
        minimum: -2,
        maximum: 16,
        interval: 2
    },
    series: [
        {
            type: 'Bubble',
            dataSource: bubbleData,
            xName: 'x', yName: 'y', 
            size: 'size', fill: 'blue',
            opacity: 0.5
        }
    ],
    title: 'GDP vs Literacy Rate'
}, '#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://cdn.syncfusion.com/ej2/33.1.44/dist/ej2.min.js" type="text/javascript"></script>
</head>

<body>
    <div id="container">
        <div id="element"></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>

Bubble size mapping

Use the size property to map the size of each bubble to the value specified in the data source.

var bubbleData = [
    { x: 92.2, y: 7.8,  size: 1.347 },
    { x: 74,   y: 6.5,  size: 1.241 },
    { x: 90.4, y: 6.0,  size: 0.238 },
    { x: 99.4, y: 2.2,  size: 0.312 },
    { x: 88.6, y: 1.3,  size: 0.197 },
    { x: 99,   y: 0.7,  size: 0.0818 },
    { x: 72,   y: 2.0,  size: 0.0826 },
    { x: 99.6, y: 3.4,  size: 0.143 },
    { x: 99,   y: 0.2,  size: 0.128 },
    { x: 86.1, y: 4.0,  size: 0.115 },
    { x: 92.6, y: 6.6,  size: 0.096 },
    { x: 61.3, y: 14.5, size: 0.162 }
]
var chart = new ej.charts.Chart({
    primaryXAxis: {
        title: 'Literacy Rate',
        minimum: 60,
        maximum: 100,
        interval: 5
    },
    primaryYAxis: {
        title: 'GDP growth rate',
        minimum: -2,
        maximum: 16,
        interval: 2
    },
    series: [
        {
            type: 'Bubble',
            dataSource: bubbleData,
            xName: 'x', yName: 'y', 
            size: 'size'
        }
    ],
    title: 'GDP vs Literacy Rate'
}, '#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://cdn.syncfusion.com/ej2/33.1.44/dist/ej2.min.js" type="text/javascript"></script>
</head>

<body>
    <div id="container">
        <div id="element"></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>

Empty points

Data points with null or undefined values are considered empty. Empty data points are ignored and not plotted on the chart.

Mode

Use the mode property to control handling of empty points. Available modes: Gap, Drop, Zero, Average. The default mode is Gap.

var bubbleData = [
    { x: 92.2, y: 7.8,  size: 1.347 },
    { x: 74,   y: 6.5,  size: 1.241 },
    { x: 90.4, y: null,  size: 0.238 },
    { x: 99.4, y: 2.2,  size: 0.312 },
    { x: 88.6, y: 1.3,  size: 0.197 },
    { x: 99,   y: 0.7,  size: 0.0818 },
    { x: 72,   y: 2.0,  size: 0.0826 },
    { x: 99.6, y: 3.4,  size: 0.143 },
    { x: 99,   y: undefined,  size: 0.128 },
    { x: 86.1, y: 4.0,  size: 0.115 },
    { x: 92.6, y: 6.6,  size: 0.096 },
    { x: 61.3, y: 14.5, size: 0.162 }
]
var chart = new ej.charts.Chart({
    primaryXAxis: {
        title: 'Literacy Rate',
        minimum: 60,
        maximum: 100,
        interval: 5
    },
    primaryYAxis: {
        title: 'GDP growth rate',
        minimum: -2,
        maximum: 16,
        interval: 2
    },
    series: [
        {
            type: 'Bubble',
            dataSource: bubbleData,
            xName: 'x', yName: 'y', 
            size: 'size',
            emptyPointSettings: {
                mode: 'Zero'
            }
        }
    ],
    title: 'GDP vs Literacy Rate'
}, '#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://cdn.syncfusion.com/ej2/33.1.44/dist/ej2.min.js" type="text/javascript"></script>
</head>

<body>
    <div id="container">
        <div id="element"></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>

Fill

Use the fill property to set the fill color for empty points.

var bubbleData = [
    { x: 92.2, y: 7.8,  size: 1.347 },
    { x: 74,   y: 6.5,  size: 1.241 },
    { x: 90.4, y: null,  size: 0.238 },
    { x: 99.4, y: 2.2,  size: 0.312 },
    { x: 88.6, y: 1.3,  size: 0.197 },
    { x: 99,   y: 0.7,  size: 0.0818 },
    { x: 72,   y: 2.0,  size: 0.0826 },
    { x: 99.6, y: 3.4,  size: 0.143 },
    { x: 99,   y: undefined,  size: 0.128 },
    { x: 86.1, y: 4.0,  size: 0.115 },
    { x: 92.6, y: 6.6,  size: 0.096 },
    { x: 61.3, y: 14.5, size: 0.162 }
]
var chart = new ej.charts.Chart({
    primaryXAxis: {
        title: 'Literacy Rate',
        minimum: 60,
        maximum: 100,
        interval: 5
    },
    primaryYAxis: {
        title: 'GDP growth rate',
        minimum: -2,
        maximum: 16,
        interval: 2
    },
    series: [
        {
            type: 'Bubble',
            dataSource: bubbleData,
            xName: 'x', yName: 'y', 
            size: 'size',
            emptyPointSettings: {
                mode: 'Zero',
                fill: 'red'
            }
        }
    ],
    title: 'GDP vs Literacy Rate'
}, '#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://cdn.syncfusion.com/ej2/33.1.44/dist/ej2.min.js" type="text/javascript"></script>
</head>

<body>
    <div id="container">
        <div id="element"></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>

Border

Use the border property to customize the border width and color for empty points.

var bubbleData = [
    { x: 92.2, y: 7.8,  size: 1.347 },
    { x: 74,   y: 6.5,  size: 1.241 },
    { x: 90.4, y: null,  size: 0.238 },
    { x: 99.4, y: 2.2,  size: 0.312 },
    { x: 88.6, y: 1.3,  size: 0.197 },
    { x: 99,   y: 0.7,  size: 0.0818 },
    { x: 72,   y: 2.0,  size: 0.0826 },
    { x: 99.6, y: 3.4,  size: 0.143 },
    { x: 99,   y: undefined,  size: 0.128 },
    { x: 86.1, y: 4.0,  size: 0.115 },
    { x: 92.6, y: 6.6,  size: 0.096 },
    { x: 61.3, y: 14.5, size: 0.162 }
]
var chart = new ej.charts.Chart({
    primaryXAxis: {
        title: 'Literacy Rate',
        minimum: 60,
        maximum: 100,
        interval: 5
    },
    primaryYAxis: {
        title: 'GDP growth rate',
        minimum: -2,
        maximum: 16,
        interval: 2
    },
    series: [
        {
            type: 'Bubble',
            dataSource: bubbleData,
            xName: 'x', yName: 'y', 
            size: 'size',
            emptyPointSettings: {
                mode: 'Zero',
                fill: 'red',
                border: { width: 2, color: 'green' }
            }
        }
    ],
    title: 'GDP vs Literacy Rate'
}, '#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://cdn.syncfusion.com/ej2/33.1.44/dist/ej2.min.js" type="text/javascript"></script>
</head>

<body>
    <div id="container">
        <div id="element"></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>

Events

Series render

The seriesRender event enables modification of series properties (for example, data, fill, or name) immediately before rendering. Use this event to adjust series appearance or to dynamically swap data sources.

var bubbleData = [
    { x: 92.2, y: 7.8,  size: 1.347 },
    { x: 74,   y: 6.5,  size: 1.241 },
    { x: 90.4, y: 6.0,  size: 0.238 },
    { x: 99.4, y: 2.2,  size: 0.312 },
    { x: 88.6, y: 1.3,  size: 0.197 },
    { x: 99,   y: 0.7,  size: 0.0818 },
    { x: 72,   y: 2.0,  size: 0.0826 },
    { x: 99.6, y: 3.4,  size: 0.143 },
    { x: 99,   y: 0.2,  size: 0.128 },
    { x: 86.1, y: 4.0,  size: 0.115 },
    { x: 92.6, y: 6.6,  size: 0.096 },
    { x: 61.3, y: 14.5, size: 0.162 }
]
var chart = new ej.charts.Chart({
    primaryXAxis: {
        title: 'Literacy Rate',
        minimum: 60,
        maximum: 100,
        interval: 5
    },
    primaryYAxis: {
        title: 'GDP growth rate',
        minimum: -2,
        maximum: 16,
        interval: 2
    },
    series: [
        {
            type: 'Bubble',
            dataSource: bubbleData,
            xName: 'x', yName: 'y', 
            size: 'size'
        }
    ],
    title: 'GDP vs Literacy Rate',
    seriesRender: function (args) {
        args.fill = '#ff6347';
    }
}, '#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://cdn.syncfusion.com/ej2/33.1.44/dist/ej2.min.js" type="text/javascript"></script>
</head>

<body>
    <div id="container">
        <div id="element"></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>

Point render

The pointRender event provides a hook to customize each data point (for example, marker shape, border, or fill) before it is drawn. Use this to apply per-point styling rules or conditional formatting.

var bubbleData = [
    { x: 92.2, y: 7.8,  size: 1.347 },
    { x: 74,   y: 6.5,  size: 1.241 },
    { x: 90.4, y: 6.0,  size: 0.238 },
    { x: 99.4, y: 2.2,  size: 0.312 },
    { x: 88.6, y: 1.3,  size: 0.197 },
    { x: 99,   y: 0.7,  size: 0.0818 },
    { x: 72,   y: 2.0,  size: 0.0826 },
    { x: 99.6, y: 3.4,  size: 0.143 },
    { x: 99,   y: 0.2,  size: 0.128 },
    { x: 86.1, y: 4.0,  size: 0.115 },
    { x: 92.6, y: 6.6,  size: 0.096 },
    { x: 61.3, y: 14.5, size: 0.162 }
]
var chart = new ej.charts.Chart({
    primaryXAxis: {
        title: 'Literacy Rate',
        minimum: 60,
        maximum: 100,
        interval: 5
    },
    primaryYAxis: {
        title: 'GDP growth rate',
        minimum: -2,
        maximum: 16,
        interval: 2
    },
    series: [
        {
            type: 'Bubble',
            dataSource: bubbleData,
            xName: 'x', yName: 'y', 
            size: 'size'
        }
    ],
    title: 'GDP vs Literacy Rate',
    pointRender: function (args) {
        if (args.point.y < 4) {
            args.fill = '#ff6347';
        }
        else {
            args.fill = '#009cb8';
        }
    }
}, '#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://cdn.syncfusion.com/ej2/33.1.44/dist/ej2.min.js" type="text/javascript"></script>
</head>

<body>
    <div id="container">
        <div id="element"></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>

See also