Drilldown with label in Angular Treemap component

23 Sep 20233 minutes to read

Yon can add a label template as <div> element to the treemap control when using the label template. To add a label template to the treemap control, you have to hide another labels by setting the showLabels property to false in leafItemSettings to show only the label template.

To add label template to treemap drilldown, follow the given steps:

Step 1:

Create a tree map control and enable the drill-down option.

import { Component, ViewEncapsulation } from '@angular/core';
import { TreeMap, IDrillStartEventArgs } from '@syncfusion/ej2-angular-treemap';
import { CarSales } from './datasource';

/**
 * Default sample
 */
@Component({
  selector: 'app-container',
  template:'<ejs-treemap id="container" #treemap style="display:block;" [dataSource]="dataSource" [weightValuePath]="weightValuePath"enableDrillDown="true" [palette]="palette"><e-levels><e-level groupPath="Continent" [border]="border"></e-level><e-level groupPath="Company" [border]="border"> </e-level></e-levels></ejs-treemap>',
  encapsulation: ViewEncapsulation.None
})
export class TreemapDrillDownComponent {
  public weightValuePath: string = "Sales";
  public palette: string[] = ['white'];
  public dataSource: object[] = CarSales;
  public border: Object = { width: 0.5, color: 'black' }
};

Step 2:

Add the label template in the leafItemSettings options, and then set the showLabels property to false to hide another labels and show only label template.

app.component.ts

import { Component, OnInit, ViewEncapsulation } from '@angular/core';
import { TreeMap, IDrillStartEventArgs } from '@syncfusion/ej2-angular-treemap';
import { CarSales } from './datasource';

@Component({
  selector: 'app-container',
  template:'<ejs-treemap id="container" #treemap style="display:block;" [dataSource]="dataSource" [weightValuePath]="weightValuePath"[leafItemSettings]="leafItemSettings" enableDrillDown="true" (drillStart)="drillStart($event)"[palette]="palette"><e-levels><e-level groupPath="Continent" [border]="border"> </e-level>	<e-level groupPath="Company" [border]="border"></e-level></e-levels></ejs-treemap>',
  encapsulation: ViewEncapsulation.None
})
export class AppComponent implements OnInit {
  ngOnInit(): void {
    throw new Error('Method not implemented.');
  }
  public drillStart = (args: IDrillStartEventArgs) => {
    let labelElementGroup: HTMLElement = document.getElementById('container_Label_Template_Group') as HTMLElement;
    labelElementGroup.remove();
  }
  public weightValuePath: string = "Sales";
  public palette: string[] = ['white'];
  public dataSource: object[] = CarSales;
  public leafItemSettings: object = {
    showLabels: false,
    labelTemplate: '#template',
    templatePosition: 'Center'
  };
  public border: Object = { width: 0.5, color: 'black' }
};

app.module.ts

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import { TreeMapModule, TreeMapAllModule } from '@syncfusion/ej2-angular-treemap';

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

main.ts

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

import 'zone.js';
enableProdMode();
platformBrowserDynamic().bootstrapModule(AppModule);