Drill Down
Documentation
The TreeMap component provides an API for implementing the drill-down functionality. Click a group in the TreeMap to drill down it. A set of clickable labels, which allow you to navigate back, will appear.
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<dx-tree-map
[dataSource]="citiesPopulations"
[interactWithGroup]="true"
[maxDepth]="2"
(onClick)="nodeClick($event)"
(onDrill)="drill($event)">
<dxo-size
height="440"></dxo-size>
<dxo-title
text="The Most Populated Cities by Continents"
[placeholderSize]="80"></dxo-title>
<dxo-colorizer
palette="soft"></dxo-colorizer>
</dx-tree-map>
<div id="drill-down-title">
<span *ngFor="let drillInfo of drillInfos; let isLast = last">
<span [ngClass]="{'link': !!drillInfo.node }" (click)="drillInfoClick(drillInfo.node)">{{drillInfo.text}}</span>
{{isLast ? '' : ' > '}}
</span>
</div>
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';
interface DrillInfo {
text: string;
node?: any;
}
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[];
drillInfos: DrillInfo[] = [];
constructor(service: Service) {
this.citiesPopulations = service.getCitiesPopulations();
}
nodeClick(e) {
e.node.drillDown();
}
drill(e) {
this.drillInfos = [];
for (let node = e.node.getParent(); node; node = node.getParent()) {
this.drillInfos.unshift({
text: node.label() || "All Continents",
node: node
})
}
if (this.drillInfos.length) {
this.drillInfos.push({
text: e.node.label()
});
}
}
drillInfoClick(node) {
if(node) {
node.drillDown();
}
}
}
@NgModule({
imports: [
BrowserModule,
DxTreeMapModule
],
declarations: [AppComponent],
bootstrap: [AppComponent]
})
export class AppModule { }
platformBrowserDynamic().bootstrapModule(AppModule);
::ng-deep #drill-down-title {
position: absolute;
top: 50px;
height: 36px;
width: 100%;
text-align: center;
}
::ng-deep .link {
color: #337ab7;
text-decoration: underline;
cursor: pointer;
}
import { Injectable } from '@angular/core';
export interface CitiesPopulation {
name: string;
items: any[];
}
let citiesPopulations: CitiesPopulation[] = [{
name: "Africa",
items: [{
name: "Nigeria",
items: [{
name: "Lagos",
value: 21324000
}, {
name: "Kano",
value: 3626068
}, {
name: "Ibadan",
value: 3200000
}, {
name: "Abuja",
value: 3000000
}, {
name: "Kaduna",
value: 1652844
}, {
name: "Port Harcourt",
value: 1320214
}, {
name: "Aba",
value: 1300000
}, {
name: "Ogbomosho",
value: 1200000
}, {
name: "Maiduguri",
value: 1197497
}]
}, {
name: "Egypt",
items: [{
name: "Cairo",
value: 9278441
}, {
name: "Alexandria",
value: 4546231
}, {
name: "Giza",
value: 4239988
}, {
name: "Shubra El-Kheima",
value: 3072951
}, {
name: "Port Said",
value: 1607353
}, {
name: "Suez",
value: 1347352
}]
}, {
name: "Congo",
items: [{
name: "Kinshasa",
value: 9735000
}, {
name: "Lubumbashi",
value: 1786397
}, {
name: "Mbuji-Mayi",
value: 1680991
}, {
name: "Kananga",
value: 1061181
}, {
name: "Bukavu",
value: 1012053
}, {
name: "Kisangani",
value: 935977
}]
}, {
name: "Morocco",
items: [{
name: "Casablanca",
value: 3359818
}, {
name: "Fès",
value: 1112072
}, {
name: "Tangier",
value: 947952
}, {
name: "Marrakech",
value: 928850
}, {
name: "Salé",
value: 920403
}]
}]
}, {
name: "Asia",
items: [{
name: "China",
items: [{
name: "Shanghai",
value: 24256800
}, {
name: "Beijing",
value: 21516000
}, {
name: "Chongqing",
value: 18384100
}, {
name: "Chengdu",
value: 17677122
}, {
name: "Tianjin",
value: 15200000
}, {
name: "Guangzhou",
value: 13080500
}, {
name: "Shenzhen",
value: 10630000
}]
}, {
name: "Pakistan",
items: [{
name: "Karachi",
value: 23500000
}, {
name: "Faisalabad",
value: 6418745
}, {
name: "Lahore",
value: 6318745
}, {
name: "Rawalpindi",
value: 3363911
}, {
name: "Hyderabad",
value: 3429471
}, {
name: "Multan",
value: 2050000
}]
}, {
name: "India",
items: [{
name: "Delhi",
value: 16787941
}, {
name: "Mumbai",
value: 12478447
}, {
name: "Bengaluru",
value: 8425970
}, {
name: "Hyderabad",
value: 7749334
}, {
name: "Chennai",
value: 7088000
}, {
name: "Ahmedabad",
value: 5577940
}]
}, {
name: "Japan",
items: [{
name: "Tokyo",
value: 9262046
}, {
name: "Yokohama",
value: 3697894
}, {
name: "Osaka",
value: 2668586
}, {
name: "Nagoya",
value: 2283289
}, {
name: "Sapporo",
value: 1918096
}]
}]
}, {
name: "Europe",
items: [{
name: "Turkey",
items: [{
name: "Istanbul",
value: 14160467
}, {
name: "Ankara",
value: 4470800
}, {
name: "İzmir",
value: 3276815
}, {
name: "Bursa",
value: 1957247
}, {
name: "Adana",
value: 1717473
}]
}, {
name: "Russia",
items: [{
name: "Moscow",
value: 12197596
}, {
name: "Saint Petersburg",
value: 5191690
}, {
name: "Novosibirsk",
value: 1473754
}, {
name: "Yekaterinburg",
value: 1428042
}]
}, {
name: "United Kingdom",
items: [{
name: "London",
value: 8538689
}, {
name: "Birmingham",
value: 1101360
}, {
name: "Glasgow",
value: 599650
}, {
name: "Liverpool",
value: 473073
}]
}, {
name: "Germany",
items: [{
name: "Berlin",
value: 3517424
}, {
name: "Hamburg",
value: 1686100
}, {
name: "Munich",
value: 1185400
}, {
name: "Cologne",
value: 1046680
}, {
name: "Frankfurt",
value: 717624
}]
}, {
name: "France",
items: [{
name: "Paris",
value: 2240621
}, {
name: "Marseille",
value: 852516
}, {
name: "Lyon",
value: 500715
}, {
name: "Toulouse",
value: 461190
}]
}]
}, {
name: "North America",
items: [{
name: "Mexico",
items: [{
name: "Mexico City",
value: 8874724
}, {
name: "Ecatepec de Morelos",
value: 1742023
}, {
name: "Puebla",
value: 1508707
}, {
name: "Guadalajara",
value: 1506359
}, {
name: "Juárez",
value: 1409987
}, {
name: "Tijuana",
value: 1399282
}, {
name: "León",
value: 1281434
}]
}, {
name: "United States",
items: [{
name: "New York City",
value: 8550405
}, {
name: "Los Angeles",
value: 3884307
}, {
name: "Chicago",
value: 2722389
}, {
name: "Houston",
value: 2296224
}, {
name: "Philadelphia",
value: 1567442
}, {
name: "Phoenix",
value: 1563025
}, {
name: "San Antonio",
value: 1469845
}, {
name: "San Diego",
value: 1394928
}]
}, {
name: "Canada",
items: [{
name: "Toronto",
value: 2808503
}, {
name: "Montreal",
value: 1731245
}, {
name: "Calgary",
value: 1096833
}, {
name: "Ottawa",
value: 956710
}, {
name: "Edmonton",
value: 895000
}, {
name: "Mississauga",
value: 713443
}]
}, {
name: "Cuba",
items: [{
name: "Havana",
value: 2135498
}, {
name: "Santiago de Cuba",
value: 425851
}, {
name: "Camagüey",
value: 305845
}]
}]
}, {
name: "South America",
items: [{
name: "Brazil",
items: [{
name: "São Paulo",
value: 11895893
}, {
name: "Rio de Janeiro",
value: 6429923
}, {
name: "Salvador",
value: 2902927
}, {
name: "Brasília",
value: 2914830
}, {
name: "Fortaleza",
value: 2591188
}, {
name: "Belo Horizonte",
value: 2513451
}, {
name: "Manaus",
value: 2094391
}]
}, {
name: "Peru",
items: [{
name: "Lima",
value: 8693387
}, {
name: "Callao",
value: 1010315
}, {
name: "Arequipa",
value: 869351
}, {
name: "Trujillo",
value: 788236
}, {
name: "Chiclayo",
value: 600440
}]
}, {
name: "Colombia",
items: [{
name: "Bogotá",
value: 7776845
}, {
name: "Medellín",
value: 2441123
}, {
name: "Cali",
value: 2400653
}, {
name: "Barranquilla",
value: 1214253
}, {
name: "Cartagena",
value: 959594
}]
}, {
name: "Chile",
items: [{
name: "Santiago",
value: 5507282
}, {
name: "Puente Alto",
value: 610118
}, {
name: "Maipú",
value: 468390
}]
}, {
name: "Venezuela",
items: [{
name: "Caracas",
value: 3289886
}, {
name: "Maracaibo",
value: 1653211
}, {
name: "Barquisimeto",
value: 1116182
}, {
name: "Valencia",
value: 901900
}, {
name: "Ciudad Guayana",
value: 877547
}]
}]
}];;
@Injectable()
export class Service {
getCitiesPopulations() {
return citiesPopulations;
}
}
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