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Tooltip in React HeatMap Chart component

02 Feb 2023 / 5 minutes to read

Tooltip is used to provide the details of the heatmap 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 into the services.

Source
Preview
App.jsx
index.jsx
App.tsx
index.tsx
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import * as React from "react";
import * as ReactDOM from 'react-dom';
import { HeatMapComponent, Inject, Legend, Tooltip } from '@syncfusion/ej2-react-heatmap';
export function App() {
    let heatmapData = [
        [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]
    ];
    return (<HeatMapComponent 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,
    }} showTooltip={true} dataSource={heatmapData}>
            <Inject services={[Legend, Tooltip]}/>
            </HeatMapComponent>);
}
const root = ReactDOM.createRoot(document.getElementById('container'));
root.render(<App />);
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import * as React from "react";
import * as ReactDOM from 'react-dom';
import { HeatMapComponent, Inject, Legend, Tooltip } from '@syncfusion/ej2-react-heatmap';
export function App() {
    let heatmapData = [
       [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]
    ];
    return ( <HeatMapComponent
            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,
            } }
            showTooltip = { true }
            dataSource={heatmapData}>
            <Inject services={[Legend, Tooltip]} />
            </HeatMapComponent> );
}
const root = ReactDOM.createRoot(document.getElementById('container'));
root.render(<App />);

Tooltip template

In heatmap, you can customize the tooltip using the tooltipRender client side event.

Source
Preview
App.jsx
index.jsx
App.tsx
index.tsx
Copied to clipboard
Copied to clipboard
import * as React from "react";
import * as ReactDOM from 'react-dom';
import { HeatMapComponent, Inject, Legend, Tooltip } from '@syncfusion/ej2-react-heatmap';
export function App() {
    let heatmapData = [
        [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, 2.3, 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],
        [3.3, 3.39, 3.4, 3.48, 3.6, 3.67, 3.73, 3.79, 3.79, 4.07],
        [5.8, 5.74, 5.64, 5.44, 5.18, 5.08, 5.07, 5.0, 5.35, 5.47],
        [6.91, 7.4, 8.13, 8.8, 9.04, 9.24, 9.43, 9.35, 9.49, 9.69]
    ];
    function tooltipTemplate(args) {
        args.content = [
            'In ' +
                args.yLabel +
                ', the ' +
                args.xLabel +
                ' produced ' +
                args.value +
                ' million barrels per day'
        ];
    }
    return (<HeatMapComponent id="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
    }} showTooltip={true} tooltipRender={tooltipTemplate} dataSource={heatmapData}>
        <Inject services={[Legend, Tooltip]}/>
      </HeatMapComponent>);
}
const root = ReactDOM.createRoot(document.getElementById('container'));
root.render(<App />);
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import * as React from "react";
import * as ReactDOM from 'react-dom';
import { HeatMapComponent, Inject, Legend, Tooltip } from '@syncfusion/ej2-react-heatmap';
export function App() {
let heatmapData = [
    [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, 2.3, 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],
    [3.3, 3.39, 3.4, 3.48, 3.6, 3.67, 3.73, 3.79, 3.79, 4.07],
    [5.8, 5.74, 5.64, 5.44, 5.18, 5.08, 5.07, 5.0, 5.35, 5.47],
    [6.91, 7.4, 8.13, 8.8, 9.04, 9.24, 9.43, 9.35, 9.49, 9.69]
];
function tooltipTemplate(args: ITooltipEventArgs): void {
    args.content = [
      'In ' +
        args.yLabel +
        ', the ' +
        args.xLabel +
        ' produced ' +
        args.value +
        ' million barrels per day'
    ];
}
return (
      <HeatMapComponent
        id="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
        }}
        showTooltip={true}
        tooltipRender={tooltipTemplate as any}
        dataSource={heatmapData}
      >
        <Inject services={[Legend, Tooltip]} />
      </HeatMapComponent>
    );
}
const root = ReactDOM.createRoot(document.getElementById('container'));
root.render(<App />);

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
App.jsx
index.jsx
App.tsx
index.tsx
Copied to clipboard
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import * as React from "react";
import * as ReactDOM from 'react-dom';
import { HeatMapComponent, Inject, Legend, Tooltip } from '@syncfusion/ej2-react-heatmap';
export function App() {
    let heatmapData = [
        [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, 2.3, 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],
        [3.3, 3.39, 3.4, 3.48, 3.6, 3.67, 3.73, 3.79, 3.79, 4.07],
        [5.8, 5.74, 5.64, 5.44, 5.18, 5.08, 5.07, 5.0, 5.35, 5.47],
        [6.91, 7.4, 8.13, 8.8, 9.04, 9.24, 9.43, 9.35, 9.49, 9.69]
    ];
    function tooltipTemplate(args) {
        args.content = [
            'In ' +
                args.yLabel +
                ', the ' +
                args.xLabel +
                ' produced ' +
                args.value +
                ' million barrels per day'
        ];
    }
    return (<HeatMapComponent id="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
    }} tooltipSettings={{
        fill: '#696295',
        textStyle: {
            color: '#FFFFFF',
            size: '12px'
        },
        border: {
            width: 2,
            color: '#F0C27B'
        }
    }} showTooltip={true} tooltipRender={tooltipTemplate} dataSource={heatmapData}>
        <Inject services={[Legend, Tooltip]}/>
      </HeatMapComponent>);
}
const root = ReactDOM.createRoot(document.getElementById('container'));
root.render(<App />);
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import * as React from "react";
import * as ReactDOM from 'react-dom';
import { HeatMapComponent, Inject, Legend, Tooltip } from '@syncfusion/ej2-react-heatmap';
export function App() {
  let heatmapData = [
    [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, 2.3, 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],
    [3.3, 3.39, 3.4, 3.48, 3.6, 3.67, 3.73, 3.79, 3.79, 4.07],
    [5.8, 5.74, 5.64, 5.44, 5.18, 5.08, 5.07, 5.0, 5.35, 5.47],
    [6.91, 7.4, 8.13, 8.8, 9.04, 9.24, 9.43, 9.35, 9.49, 9.69]
  ];
  function tooltipTemplate(args: ITooltipEventArgs): void {
    args.content = [
      'In ' +
        args.yLabel +
        ', the ' +
        args.xLabel +
        ' produced ' +
        args.value +
        ' million barrels per day'
    ];
  }
  return (
      <HeatMapComponent
        id="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
        }}
        tooltipSettings={{
          fill: '#696295',
          textStyle: {
            color: '#FFFFFF',
            size: '12px'
          },
          border: {
            width: 2,
            color: '#F0C27B'
          }
        }}
        showTooltip={true}
        tooltipRender={tooltipTemplate as any}
        dataSource={heatmapData}
      >
        <Inject services={[Legend, Tooltip]} />
      </HeatMapComponent>
    );
}
const root = ReactDOM.createRoot(document.getElementById('container'));
root.render(<App />);

Note: To use tooltip feature, we need to inject Tooltip module into the services.