Radar Chart in JavaScript Charts

18 Nov 201824 minutes to read

Radar Chart

To render a radar 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 Radar in your chart configuration. This indicates that the data should be represented as a radar chart, which is ideal for plotting data points on a circular grid.

index.js
index.html
var chartData = [
    { x: 2005, y: 28 }, { x: 2006, y: 25 },{ x: 2007, y: 26 }, { x: 2008, y: 27 },
    { x: 2009, y: 32 }, { x: 2010, y: 35 }, { x: 2011, y: 30 }
];
var chart = new ej.charts.Chart({
    primaryXAxis: {
        title: 'Year'
    },
    primaryYAxis: {
        title: 'Efficiency',
        labelFormat: '{value}%'
    },
    series:[{
        dataSource: chartData, xName: 'x', yName: 'y',
        //Series type as polar
        type: 'Radar', width:2,
        // Series draw type as line
        drawType: 'Line'
    }],
    title: 'Efficiency of oil-fired power production'
}, '#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/ej2/34.1.29/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>

Draw type

Similar to the polar chart, use the drawType property to change the series plotting type in a Radar chart to line, column, area, range column, spline, scatter, stacking area, spline area, or stacking column. The default value of drawType is Line.

index.js
index.html
var chartData = [
    { x: 2005, y: 28 }, { x: 2006, y: 25 },{ x: 2007, y: 26 }, { x: 2008, y: 27 },
    { x: 2009, y: 32 }, { x: 2010, y: 35 }, { x: 2011, y: 30 }
];
var chart = new ej.charts.Chart({
    primaryXAxis: {
        title: 'Year'
    },
    primaryYAxis: {
        title: 'Efficiency',
        labelFormat: '{value}%'
    },
    series:[{
        dataSource: chartData, xName: 'x', yName: 'y',
        //Series type as polar
        type: 'Radar', width:2,
        // Series draw type as line
        drawType: 'Line'
    }],
    title: 'Efficiency of oil-fired power production'
}, '#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/ej2/34.1.29/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.

index.js
index.html
var chartData = [
    { x: 2005, y: 28 }, { x: 2006, y: 25 },{ x: 2007, y: 26 }, { x: 2008, y: 27 },
    { x: 2009, y: 32 }, { x: 2010, y: 35 }, { x: 2011, y: 30 }
];
var chart = new ej.charts.Chart({
    primaryXAxis: {
        title: 'Year'
    },
    primaryYAxis: {
        title: 'Efficiency',
        labelFormat: '{value}%'
    },
    series:[{
        dataSource: chartData, xName: 'x', yName: 'y',
        //Series type as polar
        type: 'Radar', width:2,
        // Series draw type as line
        drawType: 'Line'
    }],
    title: 'Efficiency of oil-fired power production'
}, '#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/ej2/34.1.29/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>

Customization

Start angle

You can customize the start angle of the radar series using startAngle property. By default, startAngle is 0 degree.

index.js
index.html
var chartData = [
    { country: "USA", gold: 50 },
    { country: "China", gold: 40 },
    { country: "Japan", gold: 70 },
    { country: "Australia", gold: 60 },
    { country: "France", gold: 50 },
    { country: "Germany", gold: 40 },
    { country: "Italy", gold: 40 },
    { country: "Sweden", gold: 30 }
];
var chart = new ej.charts.Chart({
    primaryXAxis: {
        valueType: 'Category',
        title: 'Countries',
        startAngle: 120
    },
    primaryYAxis: {
        title: 'Medals'
    },
    series: [{
        dataSource: chartData,
        xName: 'country', yName: 'gold',
        // Series type as polar series
        type: 'Radar',
        // Series draw type as column series
        drawType: 'Column'
    }],
    title: 'Olympic Medals'
}, '#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/ej2/34.1.29/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>

Radius

You can customize the radius of the radar series using coefficient property. By default, coefficient is 100.

index.js
index.html
var chartData = [
    { country: "USA", gold: 50 },
    { country: "China", gold: 40 },
    { country: "Japan", gold: 70 },
    { country: "Australia", gold: 60 },
    { country: "France", gold: 50 },
    { country: "Germany", gold: 40 },
    { country: "Italy", gold: 40 },
    { country: "Sweden", gold: 30 }
];
var chart = new ej.charts.Chart({
    primaryXAxis: {
        valueType: 'Category',
        title: 'Countries',
        coefficient: 80
    },
    primaryYAxis: {
        title: 'Medals'
    },
    series: [{
        dataSource: chartData,
        xName: 'country', yName: 'gold',
        // Series type as radar series
        type: 'Radar',
        // Series draw type as column series
        drawType: 'Column'
    }],
    title: 'Olympic Medals'
}, '#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/ej2/34.1.29/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.

index.js
index.html
var chartData = [
    { x: 2005, y: 28 }, { x: 2006, y: 25 },{ x: 2007, y: 26 }, { x: 2008, y: null },
    { x: 2009, y: 32 }, { x: 2010, y: 35 }, { x: 2011, y: 30 }
];
var chart = new ej.charts.Chart({
    primaryXAxis: {
        title: 'Year'
    },
    primaryYAxis: {
        title: 'Efficiency',
        labelFormat: '{value}%'
    },
    series:[{
        dataSource: chartData, xName: 'x', yName: 'y',
        //Series type as polar
        type: 'Radar', width:2,
        // Series draw type as line
        drawType: 'Line',
        emptyPointSettings: {
            mode: 'Zero'
        }
    }],
    title: 'Efficiency of oil-fired power production'
}, '#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/ej2/34.1.29/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.

index.js
index.html
var chartData = [
    { x: 2005, y: 28 }, { x: 2006, y: 25 },{ x: 2007, y: 26 }, { x: 2008, y: null },
    { x: 2009, y: 32 }, { x: 2010, y: 35 }, { x: 2011, y: 30 }
];
var chart = new ej.charts.Chart({
    primaryXAxis: {
        title: 'Year'
    },
    primaryYAxis: {
        title: 'Efficiency',
        labelFormat: '{value}%'
    },
    series:[{
        dataSource: chartData, xName: 'x', yName: 'y',
        //Series type as polar
        type: 'Radar', width:2,
        // Series draw type as line
        drawType: 'Line',
        marker: { visible: true, width: 7, height: 7, isFilled: true },
        emptyPointSettings: {
            mode: 'Zero',
            fill: 'red'
        }
    }],
    title: 'Efficiency of oil-fired power production'
}, '#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/ej2/34.1.29/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.

index.js
index.html
var chartData = [
    { x: 2005, y: 28 }, { x: 2006, y: 25 },{ x: 2007, y: 26 }, { x: 2008, y: null },
    { x: 2009, y: 32 }, { x: 2010, y: 35 }, { x: 2011, y: 30 }
];
var chart = new ej.charts.Chart({
    primaryXAxis: {
        title: 'Year'
    },
    primaryYAxis: {
        title: 'Efficiency',
        labelFormat: '{value}%'
    },
    series:[{
        dataSource: chartData, xName: 'x', yName: 'y',
        //Series type as polar
        type: 'Radar', width:2,
        // Series draw type as line
        drawType: 'Line',
        marker: { visible: true, width: 7, height: 7, isFilled: true },
        emptyPointSettings: {
            mode: 'Zero',
            fill: 'red',
            border: { width: 2, color: 'blue' }
        }
    }],
    title: 'Efficiency of oil-fired power production'
}, '#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/ej2/34.1.29/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.

index.js
index.html
var chartData = [
    { x: 2005, y: 28 }, { x: 2006, y: 25 },{ x: 2007, y: 26 }, { x: 2008, y: 27 },
    { x: 2009, y: 32 }, { x: 2010, y: 35 }, { x: 2011, y: 30 }
];
var chart = new ej.charts.Chart({
    primaryXAxis: {
        title: 'Year'
    },
    primaryYAxis: {
        title: 'Efficiency',
        labelFormat: '{value}%'
    },
    series:[{
        dataSource: chartData, xName: 'x', yName: 'y',
        //Series type as polar
        type: 'Radar', width:2,
        // Series draw type as line
        drawType: 'Line'
    }],
    title: 'Efficiency of oil-fired power production',
    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/ej2/34.1.29/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.

index.js
index.html
var chartData = [
    { x: 2005, y: 28 }, { x: 2006, y: 25 },{ x: 2007, y: 26 }, { x: 2008, y: 27 },
    { x: 2009, y: 32 }, { x: 2010, y: 35 }, { x: 2011, y: 30 }
];
var chart = new ej.charts.Chart({
    primaryXAxis: {
        title: 'Year'
    },
    primaryYAxis: {
        title: 'Efficiency',
        labelFormat: '{value}%'
    },
    series:[{
        dataSource: chartData, xName: 'x', yName: 'y',
        //Series type as polar
        type: 'Radar', width:2,
        // Series draw type as line
        drawType: 'Line',
        marker: { visible: true }
    }],
    title: 'Efficiency of oil-fired power production',
    pointRender: function (args) {
        if (args.point.index % 2 !== 0) {
            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/ej2/34.1.29/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>

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