Hierarchical Data Structure
Documentation
The TreeMap component visualizes hierarchical data as a set of nested rectangles whose sizes are proportional to the visualized values. In this demo, the TreeMap accepts a data source of a hierarchical structure.
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<dx-tree-map
id="treemap"
[dataSource]="citiesPopulations"
title="The Most Populated Cities by Continents">
<dxo-tooltip
[enabled]="true"
format="thousands"
[customizeTooltip]="customizeTooltip"></dxo-tooltip>
</dx-tree-map>
import { NgModule, Component, enableProdMode } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { DxTreeMapModule } from 'devextreme-angular';
import { CitiesPopulation, Service } from './app.service';
if(!/localhost/.test(document.location.host)) {
enableProdMode();
}
@Component({
selector: 'demo-app',
templateUrl: 'app/app.component.html',
styleUrls: ['app/app.component.css'],
providers: [Service]
})
export class AppComponent {
citiesPopulations: CitiesPopulation[];
constructor(service: Service) {
this.citiesPopulations = service.getCitiesPopulations();
}
customizeTooltip(arg) {
var data = arg.node.data,
result = null;
if (arg.node.isLeaf()) {
result = "<span class='city'>" + data.name + "</span> (" +
data.country + ")<br/>Population: " + arg.valueText;
}
return {
text: result
};
}
}
@NgModule({
imports: [
BrowserModule,
DxTreeMapModule
],
declarations: [AppComponent],
bootstrap: [AppComponent]
})
export class AppModule { }
platformBrowserDynamic().bootstrapModule(AppModule);
::ng-deep #treemap {
height: 500px;
}
::ng-deep .city {
font-weight: 500;
}
import { Injectable } from '@angular/core';
export interface CityPopulation {
value: number;
name: string;
country: string;
}
export interface CitiesPopulation {
name: string;
items: CityPopulation[];
}
let citiesPopulations: CitiesPopulation[] = [{
name: "Africa",
items: [{
value: 21324000,
name: "Lagos",
country: "Nigeria"
}, {
value: 9735000,
name: "Kinshasa",
country: "Democratic Republic of the Congo"
}, {
value: 9278441,
name: "Cairo",
country: "Egypt"
}]
}, {
name: "Asia",
items: [{
value: 24256800,
name: "Shanghai",
country: "China"
}, {
value: 23500000,
name: "Karachi",
country: "Pakistan"
}, {
value: 21516000,
name: "Beijing",
country: "China"
}, {
value: 16787941,
name: "Delhi",
country: "India"
}, {
value: 15200000,
name: "Tianjin",
country: "China"
}]
}, {
name: "Australia",
items: [{
value: 4840600,
name: "Sydney",
country: "Austraila"
}, {
value: 4440000,
name: "Melbourne",
country: "Austraila"
}]
}, {
name: "Europe",
items: [{
value: 14160467,
name: "Istanbul",
country: "Turkey"
}, {
value: 12197596,
name: "Moscow",
country: "Russia"
}, {
value: 8538689,
name: "London",
country: "United Kingdom"
}, {
value: 5191690,
name: "Saint Petersburg",
country: "Russia"
}, {
value: 4470800,
name: "Ankara",
country: "Turkey"
}, {
value: 3517424,
name: "Berlin",
country: "Germany"
}]
}, {
name: "North America",
items: [{
value: 8874724,
name: "Mexico City",
country: "Mexico"
}, {
value: 8550405,
name: "New York City",
country: "United States"
}, {
value: 3884307,
name: "Los Angeles",
country: "United States"
}, {
value: 2808503,
name: "Toronto",
country: "Canada"
}]
}, {
name: "South America",
items: [{
value: 11895893,
name: "São Paulo",
country: "Brazil"
}, {
value: 8693387,
name: "Lima",
country: "Peru"
}, {
value: 7776845,
name: "Bogotá",
country: "Colombia"
}, {
value: 6429923,
name: "Rio de Janeiro",
country: "Brazil"
}]
}];
@Injectable()
export class Service {
getCitiesPopulations() {
return citiesPopulations;
}
}
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