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Appearance in JavaScript HeatMap Chart control

02 Feb 2023 / 10 minutes to read

Cell customization

You can customize the cell by using the cellSettings property.

Border

Change the width, color, and radius of the heat map cells by using the border property.

Source

Preview

app.ts

index.ts

index.html

import { HeatMap, Tooltip } from '@syncfusion/ej2-heatmap';
HeatMap.Inject(Tooltip);
let heatmapData: any [] = [
            [73, 39, 26, 39, 94, 0],
            [93, 58, 53, 38, 26, 68],
            [99, 28, 22, 4, 66, 90],
            [14, 26, 97, 69, 69, 3],
            [7, 46, 47, 47, 88, 6],
            [41, 55, 73, 23, 3, 79],
            [56, 69, 21, 86, 3, 33],
            [45, 7, 53, 81, 95, 79],
            [60, 77, 74, 68, 88, 51],
            [25, 25, 10, 12, 78, 14],
            [25, 56, 55, 58, 12, 82],
            [74, 33, 88, 23, 86, 59]];

let heatmap: HeatMap = new HeatMap({
    titleSettings: {
            text: 'Sales Revenue per Employee (in 1000 US$)',
            textStyle: {
                size: '15px',
                fontWeight: '500',
                fontStyle: 'Normal',
                fontFamily: 'Segoe UI'
            }
        },
        xAxis: {
            labels: ['Nancy', 'Andrew', 'Janet', 'Margaret', 'Steven',
            'Michael', 'Robert', 'Laura', 'Anne', 'Paul', 'Karin',   'Mario'],
        },
        yAxis: {
            labels: ['Mon', 'Tues', 'Wed', 'Thurs', 'Fri', 'Sat'],
        },
        dataSource: heatmapData,
        cellSettings: {
            border: {
                width: 1,
                radius: 4,
                color: 'white'
            }
        },
});
heatmap.appendTo('#element');

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

<head>
            
    <title>EJ2 HeatMap</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://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'>
        <div id='element'></div>
    </div>
</body>

</html>

Cell highlighting

Enable or disable the cell highlighting while hovering over the heat map cells by using the enableCellHighlighting property.

Note: The cell highlighting only works in a SVG rendering mode.

Source

Preview

app.ts

index.ts

index.html

import { HeatMap, Tooltip } from '@syncfusion/ej2-heatmap';
HeatMap.Inject(Tooltip);

let heatmapData: any [] = [
            [73, 39, 26, 39, 94, 0],
            [93, 58, 53, 38, 26, 68],
            [99, 28, 22, 4, 66, 90],
            [14, 26, 97, 69, 69, 3],
            [7, 46, 47, 47, 88, 6],
            [41, 55, 73, 23, 3, 79],
            [56, 69, 21, 86, 3, 33],
            [45, 7, 53, 81, 95, 79],
            [60, 77, 74, 68, 88, 51],
            [25, 25, 10, 12, 78, 14],
            [25, 56, 55, 58, 12, 82],
            [74, 33, 88, 23, 86, 59]];

let heatmap: HeatMap = new HeatMap({
    titleSettings: {
            text: 'Sales Revenue per Employee (in 1000 US$)',
            textStyle: {
                size: '15px',
                fontWeight: '500',
                fontStyle: 'Normal',
                fontFamily: 'Segoe UI'
            }
        },
        xAxis: {
            labels: ['Nancy', 'Andrew', 'Janet', 'Margaret', 'Steven',
            'Michael', 'Robert', 'Laura', 'Anne', 'Paul', 'Karin',   'Mario'],
        },
        yAxis: {
            labels: ['Mon', 'Tues', 'Wed', 'Thurs', 'Fri', 'Sat'],
        },
        dataSource: heatmapData,
        cellSettings: {
          enableCellHighlighting: true
        },
});
heatmap.appendTo('#element');

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

<head>
            
    <title>EJ2 HeatMap</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://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'>
        <div id='element'></div>
    </div>
</body>

</html>

Color gradient mode

The colorGradientMode property can be used to set the minimum and maximum values for colors based on row and column. Three types of color gradient modes are available.

Table: The minimum and maximum value colors calculated for overall data.
Row: The minimum and maximum value colors calculated for each row of data.
Column: The minimum and maximum value colors calculated for each column of data.

Note: The default value of colorGradientMode is Table.

Source

Preview

app.ts

index.ts

index.html

import { HeatMap, Tooltip } from '@syncfusion/ej2-heatmap';
HeatMap.Inject(Tooltip);

let heatmapData: any [] = [
        [73, 39, 26, 39, 94, 0],
        [93, 58, 53, 38, 26, 68],
        [99, 28, 22, 4, 66, 90],
        [14, 26, 97, 69, 69, 3],
        [7, 46, 47, 47, 88, 6],
        [41, 55, 73, 23, 3, 79],
        [56, 69, 21, 86, 3, 33],
        [45, 7, 53, 81, 95, 79],
        [60, 77, 74, 68, 88, 51],
        [25, 25, 10, 12, 78, 14],
        [25, 56, 55, 58, 12, 82],
        [74, 33, 88, 23, 86, 59]];

let heatmap: HeatMap = new HeatMap({
titleSettings: {
        text: 'Sales Revenue per Employee (in 1000 US$)',
        textStyle: {
            size: '15px',
            fontWeight: '500',
            fontStyle: 'Normal',
            fontFamily: 'Segoe UI'
        }
    },
    xAxis: {
        labels: ['Nancy', 'Andrew', 'Janet', 'Margaret', 'Steven',
        'Michael', 'Robert', 'Laura', 'Anne', 'Paul', 'Karin',   'Mario'],
    },
    yAxis: {
        labels: ['Mon', 'Tues', 'Wed', 'Thurs', 'Fri', 'Sat'],
    },
    dataSource: heatmapData,
    cellSettings: {
        enableCellHighlighting: true
    },
    paletteSettings: {
        colorGradientMode: 'Column'
    }
});
heatmap.appendTo('#element');

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

<head>
            
    <title>EJ2 HeatMap</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://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'>
        <div id='element'></div>
    </div>
</body>

</html>

Background color

The background color of the HeatMap can be customized using the backgroundColor property.

Source

Preview

app.ts

index.ts

index.html

import { HeatMap, Tooltip, ICellEventArgs } from '@syncfusion/ej2-heatmap';
HeatMap.Inject(Tooltip);

let heatmapData: any [] = [
        [73, 39, 26, 39, 94, 1],
        [93, 58, 53, 38, 26, 68],
        [99, 28, 22, 4, 66, 90],
        [14, 26, 97, 69, 69, 3],
        [7, 46, 47, 47, 88, 6],
        [41, 55, 73, 23, 3, 79],
        [56, 69, 21, 86, 3, 33],
        [45, 7, 53, 81, 95, 79],
        [60, 77, 74, 68, 88, 51],
        [25, 25, 10, 12, 78, 14],
        [25, 56, 55, 58, 12, 82],
        [74, 33, 88, 23, 86, 59]];

let heatmap: HeatMap = new HeatMap({
backgroundColor: '#c7afcf',
titleSettings: {
        text: 'Sales Revenue per Employee (in US$)',
        textStyle: {
            size: '15px',
            fontWeight: '500',
            fontStyle: 'Normal',
            fontFamily: 'Segoe UI'
        }
    },
    xAxis: {
        labels: ['Nancy', 'Andrew', 'Janet', 'Margaret', 'Steven',
        'Michael', 'Robert', 'Laura', 'Anne', 'Paul', 'Karin',   'Mario'],
    },
    yAxis: {
        labels: ['Mon', 'Tues', 'Wed', 'Thurs', 'Fri', 'Sat'],
    },
    dataSource: heatmapData
}); heatmap.appendTo('#element');

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

<head>
            
    <title>EJ2 HeatMap</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://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'>
        <div id='element'></div>
    </div>
</body>

</html>

Margin

Set the margin for the heatmap from its container by using the margin property.

Source

Preview

app.ts

index.ts

index.html

import { HeatMap, Tooltip } from '@syncfusion/ej2-heatmap';
HeatMap.Inject(Tooltip);

let heatmapData: any [] = [
        [73, 39, 26, 39, 94, 0],
        [93, 58, 53, 38, 26, 68],
        [99, 28, 22, 4, 66, 90],
        [14, 26, 97, 69, 69, 3],
        [7, 46, 47, 47, 88, 6],
        [41, 55, 73, 23, 3, 79],
        [56, 69, 21, 86, 3, 33],
        [45, 7, 53, 81, 95, 79],
        [60, 77, 74, 68, 88, 51],
        [25, 25, 10, 12, 78, 14],
        [25, 56, 55, 58, 12, 82],
        [74, 33, 88, 23, 86, 59]];

let heatmap: HeatMap = new HeatMap({
margin: { left: 15, right: 15, top: 15, bottom: 15 },
titleSettings: {
        text: 'Sales Revenue per Employee (in 1000 US$)',
        textStyle: {
            size: '15px',
            fontWeight: '500',
            fontStyle: 'Normal',
            fontFamily: 'Segoe UI'
        }
    },
    xAxis: {
        labels: ['Nancy', 'Andrew', 'Janet', 'Margaret', 'Steven',
        'Michael', 'Robert', 'Laura', 'Anne', 'Paul', 'Karin',   'Mario'],
    },
    yAxis: {
        labels: ['Mon', 'Tues', 'Wed', 'Thurs', 'Fri', 'Sat'],
    },
    dataSource: heatmapData,
});
heatmap.appendTo('#element');

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

<head>
            
    <title>EJ2 HeatMap</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://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'>
        <div id='element'></div>
    </div>
</body>

</html>

Title

The title is used to provide a quick information about the data plotted in heatmap. The text property is used to set the title for the heatmap. The text style of the title can be customized by using the textStyle property.

Source

Preview

app.ts

index.ts

index.html

import { HeatMap, Legend, Tooltip } from '@syncfusion/ej2-heatmap';
HeatMap.Inject(Legend, Tooltip);

let heatmapData: any [] = [
        [73, 39, 26, 39, 94, 0],
        [93, 58, 53, 38, 26, 68],
        [99, 28, 22, 4, 66, 90],
        [14, 26, 97, 69, 69, 3],
        [7, 46, 47, 47, 88, 6],
        [41, 55, 73, 23, 3, 79],
        [56, 69, 21, 86, 3, 33],
        [45, 7, 53, 81, 95, 79],
        [60, 77, 74, 68, 88, 51],
        [25, 25, 10, 12, 78, 14],
        [25, 56, 55, 58, 12, 82],
        [74, 33, 88, 23, 86, 59]];

let heatmap: HeatMap = new HeatMap({
titleSettings: {
        text: 'Sales Revenue per Employee (in 1000 US$)',
        textStyle: {
            size: '15px',
            fontWeight: '500',
            fontStyle: 'Italic',
            fontFamily: 'Segoe UI'
        }
    },
    xAxis: {
        labels: ['Nancy', 'Andrew', 'Janet', 'Margaret', 'Steven',
        'Michael', 'Robert', 'Laura', 'Anne', 'Paul', 'Karin',   'Mario'],
    },
    yAxis: {
        labels: ['Mon', 'Tues', 'Wed', 'Thurs', 'Fri', 'Sat'],
    },
 dataSource: heatmapData,
});
heatmap.appendTo('#element');

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

<head>
            
    <title>EJ2 HeatMap</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://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'>
        <div id='element'></div>
    </div>
</body>

</html>

Data label

The visibility of data labels can be toggled using the showLabel property. By default, the data labels will be visible.

Source

Preview

app.ts

index.ts

index.html

import { HeatMap, Tooltip } from '@syncfusion/ej2-heatmap';
HeatMap.Inject(Tooltip);

let heatmapData: any [] = [
        [73, 39, 26, 39, 94, 0],
        [93, 58, 53, 38, 26, 68],
        [99, 28, 22, 4, 66, 90],
        [14, 26, 97, 69, 69, 3],
        [7, 46, 47, 47, 88, 6],
        [41, 55, 73, 23, 3, 79],
        [56, 69, 21, 86, 3, 33],
        [45, 7, 53, 81, 95, 79],
        [60, 77, 74, 68, 88, 51],
        [25, 25, 10, 12, 78, 14],
        [25, 56, 55, 58, 12, 82],
        [74, 33, 88, 23, 86, 59]];

let heatmap: HeatMap = new HeatMap({
titleSettings: {
        text: 'Sales Revenue per Employee (in 1000 US$)',
        textStyle: {
            size: '15px',
            fontWeight: '500',
            fontStyle: 'Normal',
            fontFamily: 'Segoe UI'
        }
    },
    xAxis: {
        labels: ['Nancy', 'Andrew', 'Janet', 'Margaret', 'Steven',
        'Michael', 'Robert', 'Laura', 'Anne', 'Paul', 'Karin',   'Mario'],
    },
    yAxis: {
        labels: ['Mon', 'Tues', 'Wed', 'Thurs', 'Fri', 'Sat'],
    },
    dataSource: heatmapData,
    cellSettings: {
      showLabel: false
    },
});
heatmap.appendTo('#element');

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

<head>
            
    <title>EJ2 HeatMap</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://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'>
        <div id='element'></div>
    </div>
</body>

</html>

Customize the data label

The label displayed in the HeatMap cell can be changed using the cellRender event.

Source

Preview

app.ts

index.ts

index.html

import { HeatMap, Tooltip, ICellEventArgs } from '@syncfusion/ej2-heatmap';
HeatMap.Inject(Tooltip);

let heatmapData: any [] = [
        [73, 39, 26, 39, 94, 1],
        [93, 58, 53, 38, 26, 68],
        [99, 28, 22, 4, 66, 90],
        [14, 26, 97, 69, 69, 3],
        [7, 46, 47, 47, 88, 6],
        [41, 55, 73, 23, 3, 79],
        [56, 69, 21, 86, 3, 33],
        [45, 7, 53, 81, 95, 79],
        [60, 77, 74, 68, 88, 51],
        [25, 25, 10, 12, 78, 14],
        [25, 56, 55, 58, 12, 82],
        [74, 33, 88, 23, 86, 59]];

let heatmap: HeatMap = new HeatMap({
titleSettings: {
        text: 'Sales Revenue per Employee (in US$)',
        textStyle: {
            size: '15px',
            fontWeight: '500',
            fontStyle: 'Normal',
            fontFamily: 'Segoe UI'
        }
    },
    xAxis: {
        labels: ['Nancy', 'Andrew', 'Janet', 'Margaret', 'Steven',
        'Michael', 'Robert', 'Laura', 'Anne', 'Paul', 'Karin',   'Mario'],
    },
    yAxis: {
        labels: ['Mon', 'Tues', 'Wed', 'Thurs', 'Fri', 'Sat'],
    },
    dataSource: heatmapData,
    cellRender: (args: ICellEventArgs) => {
        args.displayText = (args.value as number) + 'K';
    },
}); heatmap.appendTo('#element');

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

<head>
            
    <title>EJ2 HeatMap</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://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'>
        <div id='element'></div>
    </div>
</body>

</html>

Text style

The text attributes of the data label such as font-family, font-size, and color can be customized using the textStyle in the cellSettings property.

Source

Preview

app.ts

index.ts

index.html

import { HeatMap, Tooltip } from '@syncfusion/ej2-heatmap';
HeatMap.Inject(Tooltip);

let heatmapData: any [] = [
        [73, 39, 26, 39, 94, 0],
        [93, 58, 53, 38, 26, 68],
        [99, 28, 22, 4, 66, 90],
        [14, 26, 97, 69, 69, 3],
        [7, 46, 47, 47, 88, 6],
        [41, 55, 73, 23, 3, 79],
        [56, 69, 21, 86, 3, 33],
        [45, 7, 53, 81, 95, 79],
        [60, 77, 74, 68, 88, 51],
        [25, 25, 10, 12, 78, 14],
        [25, 56, 55, 58, 12, 82],
        [74, 33, 88, 23, 86, 59]];

let heatmap: HeatMap = new HeatMap({
titleSettings: {
        text: 'Sales Revenue per Employee (in 1000 US$)',
        textStyle: {
            size: '15px',
            fontWeight: '500',
            fontStyle: 'Normal',
            fontFamily: 'Segoe UI'
        }
    },
    xAxis: {
        labels: ['Nancy', 'Andrew', 'Janet', 'Margaret', 'Steven',
        'Michael', 'Robert', 'Laura', 'Anne', 'Paul', 'Karin',   'Mario'],
    },
    yAxis: {
        labels: ['Mon', 'Tues', 'Wed', 'Thurs', 'Fri', 'Sat'],
    },
    dataSource: heatmapData,
    cellSettings: {
      textStyle: {
            fontStyle: 'Italic',
            fontFamily: 'Segoe UI'
        }
    },
});
heatmap.appendTo('#element');

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

<head>
            
    <title>EJ2 HeatMap</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://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'>
        <div id='element'></div>
    </div>
</body>

</html>

Format

The format of the data label, such as currency, decimal, percent etc. can be changed using format property.

Source

Preview

app.ts

index.ts

index.html

import { HeatMap, Tooltip } from '@syncfusion/ej2-heatmap';
HeatMap.Inject(Tooltip);

let heatmapData: any [] = [
        [73, 39, 26, 39, 94, 0],
        [93, 58, 53, 38, 26, 68],
        [99, 28, 22, 4, 66, 90],
        [14, 26, 97, 69, 69, 3],
        [7, 46, 47, 47, 88, 6],
        [41, 55, 73, 23, 3, 79],
        [56, 69, 21, 86, 3, 33],
        [45, 7, 53, 81, 95, 79],
        [60, 77, 74, 68, 88, 51],
        [25, 25, 10, 12, 78, 14],
        [25, 56, 55, 58, 12, 82],
        [74, 33, 88, 23, 86, 59]];

let heatmap: HeatMap = new HeatMap({
titleSettings: {
        text: 'Sales Revenue per Employee (in 1000 US$)',
        textStyle: {
            size: '15px',
            fontWeight: '500',
            fontStyle: 'Normal',
            fontFamily: 'Segoe UI'
        }
    },
    xAxis: {
        labels: ['Nancy', 'Andrew', 'Janet', 'Margaret', 'Steven',
        'Michael', 'Robert', 'Laura', 'Anne', 'Paul', 'Karin',   'Mario'],
    },
    yAxis: {
        labels: ['Mon', 'Tues', 'Wed', 'Thurs', 'Fri', 'Sat'],
    },
    dataSource: heatmapData,
    cellSettings: {
      format: '{value} 
    },
});
heatmap.appendTo('#element');

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

<head>
            
    <title>EJ2 HeatMap</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://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'>
        <div id='element'></div>
    </div>
</body>

</html>

Appearance in JavaScript HeatMap Chart control

Cell customization

Border

Cell highlighting

Color gradient mode

Background color

Margin

Title

Data label

Customize the data label

Text style

Format

See Also