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Selection

In the HeatMap, the cell selection is used to select the single or multiple heat map cells at runtime and get the selected cell details using the cellSelected client-side event. You can enable this cell selection using the allowSelection property.

Source
Preview
app.component.ts
app.module.ts
main.ts
import { Component, ViewEncapsulation } from '@angular/core';

@Component({
    selector: 'my-app',
    template:
       `<ejs-heatmap id='container' style="display:block;" [dataSource]='dataSource' [xAxis]='xAxis' [yAxis]='yAxis'
       [titleSettings]='titleSettings' [allowSelection]='allowSelection'>
        </ejs-heatmap>`,
    encapsulation: ViewEncapsulation.None
})
export class AppComponent{

dataSource: Object[] = [
            [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]];

    titleSettings: Object = {
            text: 'Sales Revenue per Employee (in 1000 US$)',
            textStyle: {
                size: '15px',
                fontWeight: '500',
                fontStyle: 'Normal',
                fontFamily: 'Segoe UI'
            }
        };
        xAxis: Object = {
            labels: ['Nancy', 'Andrew', 'Janet', 'Margaret', 'Steven',
            'Michael', 'Robert', 'Laura', 'Anne', 'Paul', 'Karin',   'Mario'],
        };
        yAxis: Object = {
            labels: ['Mon', 'Tues', 'Wed', 'Thurs', 'Fri', 'Sat'],
        };
        allowSelection: boolean = true
}
import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import { HeatMapModule} from '@syncfusion/ej2-angular-heatmap';
import { TooltipService} from '@syncfusion/ej2-angular-heatmap';

/**
 * Module
 */
@NgModule({
    imports: [
        BrowserModule, HeatMapModule
    ],
    declarations: [AppComponent],
    bootstrap: [AppComponent],
    providers: [TooltipService]
})
export class AppModule { }
import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { enableProdMode } from '@angular/core';
import { AppModule } from './app.module';

enableProdMode();
platformBrowserDynamic().bootstrapModule(AppModule);