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) {
const data = arg.node.data;
let 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[];
}
const 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;
}
}
// In real applications, you should not transpile code in the browser.
// You can see how to create your own application with Angular and DevExtreme here:
// https://js.devexpress.com/Documentation/Guide/Angular_Components/Getting_Started/Create_a_DevExtreme_Application/
window.config = {
transpiler: 'ts',
typescriptOptions: {
module: 'system',
emitDecoratorMetadata: true,
experimentalDecorators: true,
},
meta: {
'typescript': {
'exports': 'ts',
},
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paths: {
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},
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'npm:devexpress-diagram@2.1.57/package.json',
'npm:devexpress-gantt@4.1.30/package.json',
],
};
System.config(window.config);
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>DevExtreme Demo</title>
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0" />
<link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/22.1.3/css/dx.common.css" />
<link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/22.1.3/css/dx.light.css" />
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<script src="config.js"></script>
<script>
System.import("app").catch(console.error.bind(console));
</script>
</head>
<body class="dx-viewport">
<div class="demo-container">
<demo-app>Loading...</demo-app>
</div>
</body>
</html>