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Tooltip in JavaScript HeatMap Chart control

Tooltip is used to provide the details of the heat map cell, and this can be displayed, while hovering the cursor over the cell or performing tap action in touch devices.

Default Tooltip

You can enable the tooltip by setting the showTooltip property to true and injecting the Tooltip module using the HeatMap.Inject(Tooltip).

Source
Preview
index.ts
index.html
import { HeatMap, Tooltip } from '@syncfusion/ej2-heatmap';
HeatMap.Inject(Tooltip);

let heatmapData: any [] = [
   [0.72, 0.71, 0.71, 0.67, 0.72, 0.53, 0.53, 0.56, 0.58, 0.56],
    [2.28, 2.29, 2.09, 1.84, 1.64, 1.49, 1.49, 1.39, 1.32, 1.23],
    [2.02, 2.17, 2.30, 2.39, 2.36, 2.52, 2.62, 2.57, 2.57, 2.74],
    [3.21, 3.26, 3.45, 3.47, 3.42, 3.34, 3.14, 2.83, 2.64, 2.61],
    [3.22, 3.13, 3.04, 2.95, 2.69, 2.49, 2.27, 2.18, 2.06, 1.87],
    [3.30, 3.39, 3.40, 3.48, 3.60, 3.67, 3.73, 3.79, 3.79, 4.07],
    [5.80, 5.74, 5.64, 5.44, 5.18, 5.08, 5.07, 5.00, 5.35, 5.47],
    [6.91, 7.40, 8.13, 8.80, 9.04, 9.24, 9.43, 9.35, 9.49, 9.69]];

let heatmap: HeatMap = new HeatMap({
   titleSettings: {
            text: 'Crude Oil Production of Non-OPEC Countries (in Million barrels per day)',
            textStyle: {
                size: '15px',
                fontWeight: '500',
                fontStyle: 'Normal',
                fontFamily: 'Segoe UI'
            }
        },
        xAxis: {
            labels: ['Canada', 'China', 'Egypt', 'Mexico', 'Norway', 'Russia', 'UK', 'USA']
        },
        yAxis: {
             labels: ['2000', '2001', '2002', '2003', '2004', '2005', '2006', '2007', '2008', '2009', '2010'],
        },
        cellSettings: {
            showLabel: false,
        },
        dataSource: heatmapData,
        showTooltip: 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>

Tooltip template

In heat map, you can customize the tooltip using the tooltipRender client-side event.

Source
Preview
index.ts
index.html
import { HeatMap, Tooltip, ITooltipEventArgs } from '@syncfusion/ej2-heatmap';
HeatMap.Inject(Tooltip);

let heatmapData: any [] = [
   [0.72, 0.71, 0.71, 0.67, 0.72, 0.53, 0.53, 0.56, 0.58, 0.56],
    [2.28, 2.29, 2.09, 1.84, 1.64, 1.49, 1.49, 1.39, 1.32, 1.23],
    [2.02, 2.17, 2.30, 2.39, 2.36, 2.52, 2.62, 2.57, 2.57, 2.74],
    [3.21, 3.26, 3.45, 3.47, 3.42, 3.34, 3.14, 2.83, 2.64, 2.61],
    [3.22, 3.13, 3.04, 2.95, 2.69, 2.49, 2.27, 2.18, 2.06, 1.87],
    [3.30, 3.39, 3.40, 3.48, 3.60, 3.67, 3.73, 3.79, 3.79, 4.07],
    [5.80, 5.74, 5.64, 5.44, 5.18, 5.08, 5.07, 5.00, 5.35, 5.47],
    [6.91, 7.40, 8.13, 8.80, 9.04, 9.24, 9.43, 9.35, 9.49, 9.69]];

let heatmap: HeatMap = new HeatMap({
     titleSettings: {
            text: 'Crude Oil Production of Non-OPEC Countries (in Million barrels per day)',
            textStyle: {
                size: '15px',
                fontWeight: '500',
                fontStyle: 'Normal',
                fontFamily: 'Segoe UI'
            }
        },
        xAxis: {
            labels: ['Canada', 'China', 'Egypt', 'Mexico', 'Norway', 'Russia', 'UK', 'USA']
        },
        yAxis: {
             labels: ['2000', '2001', '2002', '2003', '2004', '2005', '2006', '2007', '2008', '2009', '2010'],
        },
        cellSettings: {
            showLabel: false,
        },
        dataSource: heatmapData,
        showTooltip: true,
        tooltipRender: (args: ITooltipEventArgs) => {
            args.content = ['In ' + args.yLabel + ', the ' + args.xLabel + ' produced ' + args.value + ' million barrels per day'];
        },
});
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 appearance of Tooltip

The fill and border properties are used to customize the background color and border of the tooltip respectively. The textStyle property in the tooltip is used to customize the font of the tooltip text.

Source
Preview
index.ts
index.html
import { HeatMap, Tooltip, ITooltipEventArgs } from '@syncfusion/ej2-heatmap';
HeatMap.Inject(Tooltip);

let heatmapData: any [] = [
   [0.72, 0.71, 0.71, 0.67, 0.72, 0.53, 0.53, 0.56, 0.58, 0.56],
    [2.28, 2.29, 2.09, 1.84, 1.64, 1.49, 1.49, 1.39, 1.32, 1.23],
    [2.02, 2.17, 2.30, 2.39, 2.36, 2.52, 2.62, 2.57, 2.57, 2.74],
    [3.21, 3.26, 3.45, 3.47, 3.42, 3.34, 3.14, 2.83, 2.64, 2.61],
    [3.22, 3.13, 3.04, 2.95, 2.69, 2.49, 2.27, 2.18, 2.06, 1.87],
    [3.30, 3.39, 3.40, 3.48, 3.60, 3.67, 3.73, 3.79, 3.79, 4.07],
    [5.80, 5.74, 5.64, 5.44, 5.18, 5.08, 5.07, 5.00, 5.35, 5.47],
    [6.91, 7.40, 8.13, 8.80, 9.04, 9.24, 9.43, 9.35, 9.49, 9.69]];

let heatmap: HeatMap = new HeatMap({
     titleSettings: {
            text: 'Crude Oil Production of Non-OPEC Countries (in Million barrels per day)',
            textStyle: {
                size: '15px',
                fontWeight: '500',
                fontStyle: 'Normal',
                fontFamily: 'Segoe UI'
            }
        },
        xAxis: {
            labels: ['Canada', 'China', 'Egypt', 'Mexico', 'Norway', 'Russia', 'UK', 'USA']
        },
        yAxis: {
             labels: ['2000', '2001', '2002', '2003', '2004', '2005', '2006', '2007', '2008', '2009', '2010'],
        },
        paletteSettings: {
            palette: [{ color: '#F0ADCE' },
            { color: '#19307B' }
            ]
        },
        cellSettings: {
            showLabel: false,
        },
        dataSource: heatmapData,
        showTooltip: true,
        tooltipSettings: {
            fill: '#696295',
            textStyle: {
                color: '#FFFFFF',
                size: '12px'
            },
             border: {
                width: 2,
                color: '#F0C27B'
            }
        },
        tooltipRender: (args: ITooltipEventArgs) => {
            args.content = ['In ' + args.yLabel + ', the ' + args.xLabel + ' produced ' + args.value + ' million barrels per day'];
        },
 });
 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>

Note: To use tooltip feature, we need to inject Tooltip using HeatMap.Inject(Tooltip).