Selection in React HeatMap chart component
4 Jul 202324 minutes to read
In the HeatMap, the cell selection is used to select single or multiple HeatMap cells at runtime and get the selected cell details using the cellSelected event. You can enable the cell selection using the allowSelection property.
The HeatMap cells can be selected using the following interactions, as shown in the table below.
| Modes of Interactions | Description |
|---|---|
| Mouse | HeatMap cells can be selected by clicking or dragging and dropping over them. |
| Touch | HeatMap cells can be selected by tapping or dragging and dropping over them. |
| Keyboard | The Ctrl key on the keyboard can be used to enable multiple cell selection with mouse and touch interaction. The Ctrl key can only be used if the enableMultiSelect property is set to true in order to enable multiple cell selection. |
import * as React from "react";
import * as ReactDOM from 'react-dom';
import { HeatMapComponent, Inject, Legend, Tooltip, Adaptor } from '@syncfusion/ej2-react-heatmap';
export function App() {
var heatmapData = [
[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]
];
return ( <HeatMapComponent
titleSettings = { {
text: 'Sales Revenue per Employee (in 1000 US$)',
textStyle: {
size: '15px',
fontWeight: '500',
fontStyle: 'Normal',
fontFamily: 'Segoe UI'
}
} }
xAxis = { {
labels: ['Nancy', 'Andrew', 'Janet', 'Margaret', 'Steven',
'Michael', 'Robert', 'Laura', 'Anne', 'Paul', 'Karin', 'Mario'],
} }
yAxis = { {
labels: ['Mon', 'Tues', 'Wed', 'Thurs', 'Fri', 'Sat'],
} }
allowSelection={ true }
dataSource={heatmapData}>
<Inject services={[Legend,Tooltip]} />
</HeatMapComponent> );
}
const root = ReactDOM.createRoot(document.getElementById('container'));
root.render(<App />);import * as React from "react";
import * as ReactDOM from 'react-dom';
import { HeatMapComponent, Inject, Legend, Tooltip, Adaptor } from '@syncfusion/ej2-react-heatmap';
export function App() {
let heatmapData : any[] = [
[73, 39, 26, 39, 94, 0],
[93, 58, 53, 38, 26, 68],
[99, 28, 22, 4, 66, 90],
[14, 26, 97, 69, 69, 3],
[7, 46, 47, 47, 88, 6],
[41, 55, 73, 23, 3, 79],
[56, 69, 21, 86, 3, 33],
[45, 7, 53, 81, 95, 79],
[60, 77, 74, 68, 88, 51],
[25, 25, 10, 12, 78, 14],
[25, 56, 55, 58, 12, 82],
[74, 33, 88, 23, 86, 59]
];
return ( <HeatMapComponent
titleSettings = { {
text: 'Sales Revenue per Employee (in 1000 US$)',
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'],
} }
allowSelection={ true }
dataSource={heatmapData}>
<Inject services={[Legend,Tooltip]} />
</HeatMapComponent> );
}
const root = ReactDOM.createRoot(document.getElementById('container'));
root.render(<App />);Enable single cell selection
In the HeatMap, the enableMultiSelect property is used to allow single cell selection. When you set the enableMultiSelect property to false, only one cell is selected. By default, enableMultiSelect property is set to true.
import * as React from "react";
import * as ReactDOM from 'react-dom';
import { HeatMapComponent, Inject, Legend,Tooltip } from '@syncfusion/ej2-react-heatmap';
export function App() {
var heatmapData = [
[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]
];
return ( <HeatMapComponent
titleSettings = { {
text: 'Sales Revenue per Employee (in 1000 US$)',
textStyle: {
size: '15px',
fontWeight: '500',
fontStyle: 'Normal',
fontFamily: 'Segoe UI'
}
} }
xAxis = { {
labels: ['Nancy', 'Andrew', 'Janet', 'Margaret', 'Steven',
'Michael', 'Robert', 'Laura', 'Anne', 'Paul', 'Karin', 'Mario'],
} }
yAxis = { {
labels: ['Mon', 'Tues', 'Wed', 'Thurs', 'Fri', 'Sat'],
} }
enableMultiSelect= { false }
allowSelection={ true }
dataSource={heatmapData}>
<Inject services={[Legend,Tooltip]} />
</HeatMapComponent> );
}
const root = ReactDOM.createRoot(document.getElementById('container'));
root.render(<App />);import * as React from "react";
import * as ReactDOM from 'react-dom';
import { HeatMapComponent, Inject, Legend,Tooltip } from '@syncfusion/ej2-react-heatmap';
export function App() {
let heatmapData : any[] = [
[73, 39, 26, 39, 94, 0],
[93, 58, 53, 38, 26, 68],
[99, 28, 22, 4, 66, 90],
[14, 26, 97, 69, 69, 3],
[7, 46, 47, 47, 88, 6],
[41, 55, 73, 23, 3, 79],
[56, 69, 21, 86, 3, 33],
[45, 7, 53, 81, 95, 79],
[60, 77, 74, 68, 88, 51],
[25, 25, 10, 12, 78, 14],
[25, 56, 55, 58, 12, 82],
[74, 33, 88, 23, 86, 59]
];
return ( <HeatMapComponent
titleSettings = { {
text: 'Sales Revenue per Employee (in 1000 US$)',
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'],
} }
enableMultiSelect= { false }
allowSelection={ true }
dataSource={heatmapData}>
<Inject services={[Legend,Tooltip]} />
</HeatMapComponent> );
}
const root = ReactDOM.createRoot(document.getElementById('container'));
root.render(<App />);Clearing cell selection
The clearSelection method can be used to clear all the selected cells. The below example illustrates the same.
import * as React from "react";
import * as ReactDOM from 'react-dom';
import { HeatMapComponent, Inject, Legend, Tooltip } from '@syncfusion/ej2-react-heatmap';
import { ButtonComponent } from '@syncfusion/ej2-react-buttons';
export function App() {
let heatmapInstance;
var heatmapData = [
[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]
];
function onClick(args) {
heatmapInstance.clearSelection();
}
return (<div><HeatMapComponent ref={m => heatmapInstance = m}
titleSettings={{
text: 'Sales Revenue per Employee (in 1000 US$)',
textStyle: {
size: '15px',
fontWeight: '500',
fontStyle: 'Normal',
fontFamily: 'Segoe UI'
}
}}
xAxis={{
labels: ['Nancy', 'Andrew', 'Janet', 'Margaret', 'Steven',
'Michael', 'Robert', 'Laura', 'Anne', 'Paul', 'Karin', 'Mario'],
}}
yAxis={{
labels: ['Mon', 'Tues', 'Wed', 'Thurs', 'Fri', 'Sat'],
}}
allowSelection={true}
dataSource={heatmapData}>
<Inject services={[Legend, Tooltip]} />
</HeatMapComponent>
<ButtonComponent id="clearSelection" onClick={onClick.bind(this)}>Clear Selection</ButtonComponent>
</div>);
}
const root = ReactDOM.createRoot(document.getElementById('container'));
root.render(<App />);import * as React from "react";
import * as ReactDOM from 'react-dom';
import { HeatMapComponent, Inject, Legend, Tooltip } from '@syncfusion/ej2-react-heatmap';
import { ButtonComponent } from '@syncfusion/ej2-react-buttons';
export function App() {
let heatmapInstance: HeatMapComponent;
let heatmapData: any[] = [
[73, 39, 26, 39, 94, 0],
[93, 58, 53, 38, 26, 68],
[99, 28, 22, 4, 66, 90],
[14, 26, 97, 69, 69, 3],
[7, 46, 47, 47, 88, 6],
[41, 55, 73, 23, 3, 79],
[56, 69, 21, 86, 3, 33],
[45, 7, 53, 81, 95, 79],
[60, 77, 74, 68, 88, 51],
[25, 25, 10, 12, 78, 14],
[25, 56, 55, 58, 12, 82],
[74, 33, 88, 23, 86, 59]
];
function onClick(args) {
heatmapInstance.clearSelection();
}
return (<div><HeatMapComponent ref={m => heatmapInstance = m}
titleSettings={{
text: 'Sales Revenue per Employee (in 1000 US$)',
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'],
}}
allowSelection={true}
dataSource={heatmapData}>
<Inject services={[Legend, Tooltip]} />
</HeatMapComponent>
<ButtonComponent id="clearSelection" onClick={onClick.bind(this)}>Clear Selection</ButtonComponent>
</div>);
}
const root = ReactDOM.createRoot(document.getElementById('container'));
root.render(<App />);