Scatter Chart in EJ2 JavaScript control

19 Mar 202524 minutes to read

Scatter charts

To render a scatter 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 Scatter in your chart configuration. This indicates that the data should be displayed as individual points scattered across the chart.
var series1 = [];
var series2 = [];
var point1;
var value = 80;
var value1 = 70;
var i;
for (i = 1; i < 120; i++) {
    if (Math.random() > 0.5) {
        value += Math.random();
    } else {
        value -= Math.random();
    }
    value = value < 60 ? 60 : value > 90 ? 90 : value;
    point1 = { x: 120 + (i / 2), y: value.toFixed(1) };
    series1.push(point1);
}
for (i = 1; i < 120; i++) {
    if (Math.random() > 0.5) {
        value1 += Math.random();
    } else {
        value1 -= Math.random();
    }
    value1 = value1 < 60 ? 60 : value1 > 90 ? 90 : value1;
    point1 = { x: 120 + (i / 2), y: value1.toFixed(1) };
    series2.push(point1);
}

var chart = new ej.charts.Chart({
    primaryXAxis: {
        title: 'Height (cm)',
        minimum: 120, maximum: 180,
        edgeLabelPlacement: 'Shift',
        labelFormat: '{value}cm'
    },
    primaryYAxis:
    {
        title: 'Weight (kg)',
        minimum: 60, maximum: 90,
        labelFormat: '{value}kg',
        rangePadding: 'None'
    },
    series: [
        {
            //Series type as scatter
            type: 'Scatter',
            dataSource: series1, xName: 'x', yName: 'y',
            name: 'Male',
            marker: { width: 10, height: 10 }
        }, {
            type: 'Scatter',
            dataSource: series2, xName: 'x', yName: 'y',
            name: 'Female',
            marker: { width: 10, height: 10 }
        }
    ],
    title: 'Height Vs Weight'
}, '#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/ej2/29.1.33/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">
        <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 series1 = [];
var series2 = [];
var point1;
var value = 80;
var value1 = 70;
var i;
for (i = 1; i < 120; i++) {
    if (Math.random() > 0.5) {
        value += Math.random();
    } else {
        value -= Math.random();
    }
    value = value < 60 ? 60 : value > 90 ? 90 : value;
    point1 = { x: 120 + (i / 2), y: value.toFixed(1) };
    series1.push(point1);
}
for (i = 1; i < 120; i++) {
    if (Math.random() > 0.5) {
        value1 += Math.random();
    } else {
        value1 -= Math.random();
    }
    value1 = value1 < 60 ? 60 : value1 > 90 ? 90 : value1;
    point1 = { x: 120 + (i / 2), y: value1.toFixed(1) };
    series2.push(point1);
}

var chart = new ej.charts.Chart({
    primaryXAxis: {
        title: 'Height (cm)',
        minimum: 120, maximum: 180,
        edgeLabelPlacement: 'Shift',
        labelFormat: '{value}cm'
    },
    primaryYAxis:
    {
        title: 'Weight (kg)',
        minimum: 60, maximum: 90,
        labelFormat: '{value}kg',
        rangePadding: 'None'
    },
    series: [
        {
            //Series type as scatter
            type: 'Scatter',
            dataSource: series1, xName: 'x', yName: 'y',
            name: 'Male',
            marker: { width: 10, height: 10 }
        }, {
            type: 'Scatter',
            dataSource: series2, xName: 'x', yName: 'y',
            name: 'Female',
            marker: { width: 10, height: 10 }
        }
    ],
    title: 'Height Vs Weight'
}, '#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/ej2/29.1.33/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">
        <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 scatter series.

Fill

The fill property determines the color applied to the series.

var series1 = [];
var series2 = [];
var point1;
var value = 80;
var value1 = 70;
var i;
for (i = 1; i < 120; i++) {
  if (Math.random() > 0.5) {
    value += Math.random();
  } else {
    value -= Math.random();
  }
  value = value < 60 ? 60 : value > 90 ? 90 : value;
  point1 = { x: 120 + i / 2, y: value.toFixed(1) };
  series1.push(point1);
}
for (i = 1; i < 120; i++) {
  if (Math.random() > 0.5) {
    value1 += Math.random();
  } else {
    value1 -= Math.random();
  }
  value1 = value1 < 60 ? 60 : value1 > 90 ? 90 : value1;
  point1 = { x: 120 + i / 2, y: value1.toFixed(1) };
  series2.push(point1);
}

var chart = new ej.charts.Chart(
  {
    primaryXAxis: {
      title: 'Height (cm)',
      minimum: 120,
      maximum: 180,
      edgeLabelPlacement: 'Shift',
      labelFormat: '{value}cm'
    },
    primaryYAxis: {
      title: 'Weight (kg)',
      minimum: 60,
      maximum: 90,
      labelFormat: '{value}kg',
      rangePadding: 'None'
    },
    series: [
      {
        type: 'Scatter',
        dataSource: series1,
        xName: 'x',
        yName: 'y',
        name: 'Male',
        marker: { width: 5, height: 5 }
      },
      {
        type: 'Scatter',
        dataSource: series2,
        xName: 'x',
        yName: 'y',
        name: 'Female',
        fill: 'red',
        marker: { width: 3, height: 3 }
      }
    ],
    title: 'Height Vs Weight'
  },
  '#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/ej2/29.1.33/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">
        <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 specifies the transparency level of the fill. Adjusting this property allows you to control how opaque or transparent the fill color of the series appears.

var series1 = [];
var series2 = [];
var point1;
var value = 80;
var value1 = 70;
var i;
for (i = 1; i < 120; i++) {
  if (Math.random() > 0.5) {
    value += Math.random();
  } else {
    value -= Math.random();
  }
  value = value < 60 ? 60 : value > 90 ? 90 : value;
  point1 = { x: 120 + i / 2, y: value.toFixed(1) };
  series1.push(point1);
}
for (i = 1; i < 120; i++) {
  if (Math.random() > 0.5) {
    value1 += Math.random();
  } else {
    value1 -= Math.random();
  }
  value1 = value1 < 60 ? 60 : value1 > 90 ? 90 : value1;
  point1 = { x: 120 + i / 2, y: value1.toFixed(1) };
  series2.push(point1);
}

var chart = new ej.charts.Chart(
  {
    primaryXAxis: {
      title: 'Height (cm)',
      minimum: 120,
      maximum: 180,
      edgeLabelPlacement: 'Shift',
      labelFormat: '{value}cm'
    },
    primaryYAxis: {
      title: 'Weight (kg)',
      minimum: 60,
      maximum: 90,
      labelFormat: '{value}kg',
      rangePadding: 'None'
    },
    series: [
      {
        type: 'Scatter',
        dataSource: series1,
        xName: 'x',
        yName: 'y',
        name: 'Male',
        opacity: 0.7,
        marker: { width: 5, height: 5 }
      },
      {
        type: 'Scatter',
        dataSource: series2,
        xName: 'x',
        yName: 'y',
        name: 'Female',
        opacity: 0.7,
        fill: 'red',
        marker: { width: 3, height: 3 }
      }
    ],
    title: 'Height Vs Weight'
  },
  '#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/ej2/29.1.33/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">
        <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>

Shape

The shape property allows you to customize the appearance of the markers by specifying different shapes.

var series1 = [];
var series2 = [];
var point1;
var value = 80;
var value1 = 70;
var i;
for (i = 1; i < 120; i++) {
  if (Math.random() > 0.5) {
    value += Math.random();
  } else {
    value -= Math.random();
  }
  value = value < 60 ? 60 : value > 90 ? 90 : value;
  point1 = { x: 120 + i / 2, y: value.toFixed(1) };
  series1.push(point1);
}
for (i = 1; i < 120; i++) {
  if (Math.random() > 0.5) {
    value1 += Math.random();
  } else {
    value1 -= Math.random();
  }
  value1 = value1 < 60 ? 60 : value1 > 90 ? 90 : value1;
  point1 = { x: 120 + i / 2, y: value1.toFixed(1) };
  series2.push(point1);
}

var chart = new ej.charts.Chart(
  {
    primaryXAxis: {
      title: 'Height (cm)',
      minimum: 120,
      maximum: 180,
      edgeLabelPlacement: 'Shift',
      labelFormat: '{value}cm'
    },
    primaryYAxis: {
      title: 'Weight (kg)',
      minimum: 60,
      maximum: 90,
      labelFormat: '{value}kg',
      rangePadding: 'None'
    },
    series: [
      {
        type: 'Scatter',
        dataSource: series1,
        xName: 'x',
        yName: 'y',
        name: 'Male',
        opacity: 0.7,
        marker: { width: 5, height: 5, shape: 'Triangle' }
      },
      {
        type: 'Scatter',
        dataSource: series2,
        xName: 'x',
        yName: 'y',
        name: 'Female',
        opacity: 0.7,
        fill: 'red',
        marker: { width: 3, height: 3, shape: 'Square' }
      }
    ],
    title: 'Height Vs Weight'
  },
  '#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/ej2/29.1.33/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">
        <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

The border property allows you to customize the border of the series by defining its color, width, and dashArray.

var series1 = [];
var series2 = [];
var point1;
var value = 80;
var value1 = 70;
var i;
for (i = 1; i < 8; i++) {
  if (Math.random() > 0.5) {
    value += Math.random();
  } else {
    value -= Math.random();
  }
  value = value < 60 ? 60 : value > 90 ? 90 : value;
  point1 = { x: 120 + i / 2, y: value.toFixed(1) };
  series1.push(point1);
}
for (i = 1; i < 8; i++) {
  if (Math.random() > 0.5) {
    value1 += Math.random();
  } else {
    value1 -= Math.random();
  }
  value1 = value1 < 60 ? 60 : value1 > 90 ? 90 : value1;
  point1 = { x: 120 + i / 2, y: value1.toFixed(1) };
  series2.push(point1);
}

var chart = new ej.charts.Chart(
  {
    primaryXAxis: {
      title: 'Height (cm)',
      edgeLabelPlacement: 'Shift',
      labelFormat: '{value}cm'
    },
    primaryYAxis: {
      title: 'Weight (kg)',
      minimum: 60,
      maximum: 90,
      labelFormat: '{value}kg',
      rangePadding: 'None'
    },
    series: [
      {
        type: 'Scatter',
        dataSource: series1,
        xName: 'x',
        yName: 'y',
        name: 'Male',
        opacity: 0.7,
        border: { width: 2, color: 'red' },
        marker: { width: 22, height: 22, shape: 'Circle' },
      },
      {
        type: 'Scatter',
        dataSource: series2,
        xName: 'x',
        yName: 'y',
        name: 'Female',
        opacity: 0.7,
        fill: 'red',
        border: { width: 2, color: 'Blue', dashArray: '15,2' },
        marker: { width: 22, height: 22, shape: 'Circle' },
      }
    ],
    title: 'Height Vs Weight'
  },
  '#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/ej2/29.1.33/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">
        <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 define how empty or missing data points are handled in the series. The default mode for empty points is Gap.

var scatterData = [
    { x: 1, y: 15 },
    { x: 2, y: 25 },
    { x: 3, y: 35 },
    { x: 4, y: null },
    { x: 5, y: 55 },
    { x: 6, y: 60 },
    { x: 7, y: 65 },
    { x: 8, y: 70 },
    { x: 9, y: 75 },
    { x: 10, y: 80 },
    { x: 11, y: undefined },
    { x: 12, y: 90 },
    { x: 13, y: 92 },
    { x: 14, y: 94 },
    { x: 15, y: 96 },
    { x: 16, y: null },
    { x: 17, y: 98 },
    { x: 18, y: 99 },
    { x: 19, y: 100 },
    { x: 20, y: 100 }
];

var chart = new ej.charts.Chart({
    primaryXAxis: {
        minimum: 0,
        maximum: 21,
        interval: 3,
        majorGridLines: { width: 0 },
        title: 'Study Hours (Per Week)'
    },
    primaryYAxis:
    {
        title: 'Test Scores (%)',
        minimum: 0,
        maximum: 120,
        interval: 20,
        labelFormat: '{value}%'
    },
    series: [
        {
            type: 'Scatter',
            dataSource: scatterData,
            xName: 'x',
            yName: 'y', 
            marker: {
                visible: false,
                width: 10,
                height: 10,
                shape: 'Circle'
            },
            emptyPointSettings: {
                mode: 'Zero'
            }
        }
    ],
    title: 'Relationship Between Study Hours and Test Scores'
}, '#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/ej2/29.1.33/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">
        <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 customize the fill color of empty points in the series.

var scatterData = [
    { x: 1, y: 15 },
    { x: 2, y: 25 },
    { x: 3, y: 35 },
    { x: 4, y: null },
    { x: 5, y: 55 },
    { x: 6, y: 60 },
    { x: 7, y: 65 },
    { x: 8, y: 70 },
    { x: 9, y: 75 },
    { x: 10, y: 80 },
    { x: 11, y: undefined },
    { x: 12, y: 90 },
    { x: 13, y: 92 },
    { x: 14, y: 94 },
    { x: 15, y: 96 },
    { x: 16, y: null },
    { x: 17, y: 98 },
    { x: 18, y: 99 },
    { x: 19, y: 100 },
    { x: 20, y: 100 }
];

var chart = new ej.charts.Chart({
    primaryXAxis: {
        minimum: 0,
        maximum: 21,
        interval: 3,
        majorGridLines: { width: 0 },
        title: 'Study Hours (Per Week)'
    },
    primaryYAxis:
    {
        title: 'Test Scores (%)',
        minimum: 0,
        maximum: 120,
        interval: 20,
        labelFormat: '{value}%'
    },
    series: [
        {
            type: 'Scatter',
            dataSource: scatterData,
            xName: 'x',
            yName: 'y', 
            marker: {
                visible: false,
                width: 10,
                height: 10,
                shape: 'Circle'
            },
            emptyPointSettings: {
                mode: 'Average',
                fill: 'red'
            }
        }
    ],
    title: 'Relationship Between Study Hours and Test Scores'
}, '#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/ej2/29.1.33/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">
        <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 width and color of the border for empty points.

var scatterData = [
    { x: 1, y: 15 },
    { x: 2, y: 25 },
    { x: 3, y: 35 },
    { x: 4, y: null },
    { x: 5, y: 55 },
    { x: 6, y: 60 },
    { x: 7, y: 65 },
    { x: 8, y: 70 },
    { x: 9, y: 75 },
    { x: 10, y: 80 },
    { x: 11, y: undefined },
    { x: 12, y: 90 },
    { x: 13, y: 92 },
    { x: 14, y: 94 },
    { x: 15, y: 96 },
    { x: 16, y: null },
    { x: 17, y: 98 },
    { x: 18, y: 99 },
    { x: 19, y: 100 },
    { x: 20, y: 100 }
];

var chart = new ej.charts.Chart({
    primaryXAxis: {
        minimum: 0,
        maximum: 21,
        interval: 3,
        majorGridLines: { width: 0 },
        title: 'Study Hours (Per Week)'
    },
    primaryYAxis:
    {
        title: 'Test Scores (%)',
        minimum: 0,
        maximum: 120,
        interval: 20,
        labelFormat: '{value}%'
    },
    series: [
        {
            type: 'Scatter',
            dataSource: scatterData,
            xName: 'x',
            yName: 'y', 
            marker: {
                visible: false,
                width: 10,
                height: 10,
                shape: 'Circle'
            },
            emptyPointSettings: {
                mode: 'Average',
                fill: 'red',
                border: { width: 2, color: 'green' }
            }
        }
    ],
    title: 'Relationship Between Study Hours and Test Scores'
}, '#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/ej2/29.1.33/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">
        <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 allows you to customize series properties, such as data, fill, and name, before they are rendered on the chart.

var scatterData = [
    { x: 1, y: 15 },
    { x: 2, y: 25 },
    { x: 3, y: 35 },
    { x: 4, y: 45 },
    { x: 5, y: 55 },
    { x: 6, y: 60 },
    { x: 7, y: 65 },
    { x: 8, y: 70 },
    { x: 9, y: 75 },
    { x: 10, y: 80 },
    { x: 11, y: 85 },
    { x: 12, y: 90 },
    { x: 13, y: 92 },
    { x: 14, y: 94 },
    { x: 15, y: 96 },
    { x: 16, y: 97 },
    { x: 17, y: 98 },
    { x: 18, y: 99 },
    { x: 19, y: 100 },
    { x: 20, y: 100 }
];

var chart = new ej.charts.Chart({
    primaryXAxis: {
        minimum: 0,
        maximum: 21,
        interval: 3,
        majorGridLines: { width: 0 },
        title: 'Study Hours (Per Week)'
    },
    primaryYAxis:
    {
        title: 'Test Scores (%)',
        minimum: 0,
        maximum: 120,
        interval: 20,
        labelFormat: '{value}%'
    },
    series: [
        {
            type: 'Scatter',
            dataSource: scatterData,
            xName: 'x',
            yName: 'y', 
            marker: {
                visible: false,
                width: 10,
                height: 10,
                shape: 'Circle'
            }
        }
    ],
    title: 'Relationship Between Study Hours and Test Scores',
    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/ej2/29.1.33/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">
        <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 allows you to customize each data point before it is rendered on the chart.

var scatterData = [
    { x: 1, y: 15 },
    { x: 2, y: 25 },
    { x: 3, y: 35 },
    { x: 4, y: 45 },
    { x: 5, y: 55 },
    { x: 6, y: 60 },
    { x: 7, y: 65 },
    { x: 8, y: 70 },
    { x: 9, y: 75 },
    { x: 10, y: 80 },
    { x: 11, y: 85 },
    { x: 12, y: 90 },
    { x: 13, y: 92 },
    { x: 14, y: 94 },
    { x: 15, y: 96 },
    { x: 16, y: 97 },
    { x: 17, y: 98 },
    { x: 18, y: 99 },
    { x: 19, y: 100 },
    { x: 20, y: 100 }
];

var chart = new ej.charts.Chart({
    primaryXAxis: {
        minimum: 0,
        maximum: 21,
        interval: 3,
        majorGridLines: { width: 0 },
        title: 'Study Hours (Per Week)'
    },
    primaryYAxis:
    {
        title: 'Test Scores (%)',
        minimum: 0,
        maximum: 120,
        interval: 20,
        labelFormat: '{value}%'
    },
    series: [
        {
            type: 'Scatter',
            dataSource: scatterData,
            xName: 'x',
            yName: 'y', 
            marker: {
                visible: false,
                width: 10,
                height: 10,
                shape: 'Circle'
            }
        }
    ],
    title: 'Relationship Between Study Hours and Test Scores',
    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/ej2/29.1.33/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">
        <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