Legend customization in Angular Heatmap chart component

20 Sep 20226 minutes to read

You can change the legend label using the legendRender client-side event. You can also hide the legend label using this client-side event.

app.component.ts

import { EmitType } from '@syncfusion/ej2-base';
import { Component, ViewEncapsulation } from '@angular/core';
import { ILegendRenderEventArgs } from '@syncfusion/ej2-angular-heatmap';
@Component({
    selector: 'app-container',
    template:
       `<ejs-heatmap id='container' style="display:block;" [dataSource]='dataSource' [xAxis]='xAxis'  [yAxis]='yAxis'
       [titleSettings]='titleSettings' [paletteSettings]='paletteSettings' [legendSettings]='legendSettings' [cellSettings]='cellSettings' (legendRender)='legendRender($event)'>
        </ejs-heatmap>`,
    encapsulation: ViewEncapsulation.None
})
export class AppComponent{

dataSource: Object[] = [
    [73000, 39000, 26000, 39000, 94000, 0],
    [93000, 58000, 53000, 38000, 26000, 68000],
    [99000, 28000, 22000, 4000, 66000, 9000],
    [14000, 26000, 97000, 69000, 69000, 3000],
    [7000, 46000, 47000, 47000, 88000, 6000],
    [41000, 55000, 73000, 23000, 30000, 79000],
    [56000, 69000, 21000, 86000, 3000, 33000],
    [45000, 7000, 53000, 81000, 95000, 79000],
    [60000, 77000, 74000, 68000, 88000, 51000],
    [25000, 25000, 10000, 12000, 78000, 14000],
    [25000, 56000, 55000, 58000, 12000, 82000],
    [74000, 33000, 88000, 23000, 86000, 59000]];

    public legendRender(args: ILegendRenderEventArgs): void {
        if(args.text=='25,000' || args.text=='50,000'|| args.text=='99,000'){
            args.text = args.text.replace(/,/, "");
            args.text = `${parseInt(args.text/1000)}` + "k "+"$";
        } else {
            args.cancel=true;
        }
    };

    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'],
    };
    cellSettings: Object = {
        showLabel: false,
    };
    paletteSettings: Object = {
        palette: [
            { value: 0, color: '#C2E7EC' },
            { value: 25000, color: '#AEDFE6' },
            { value: 50000, color: '#9AD7E0' },
            { value: 75000, color: '#72C7D4' },
            { value: 99000, color: '#5EBFCE' },
        ],
        type: 'Gradient'
    };

}

app.module.ts

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import { HeatMapModule} from '@syncfusion/ej2-angular-heatmap';
import { LegendService} from '@syncfusion/ej2-angular-heatmap';

/**
 * Module
 */
@NgModule({
    imports: [
        BrowserModule, HeatMapModule
    ],
    declarations: [AppComponent],
    bootstrap: [AppComponent],
    providers: [ LegendService]
})
export class AppModule { }

main.ts

import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { enableProdMode } from '@angular/core';
import { AppModule } from './app.module';

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