Angular Charts - Tooltip Customization

To set the tooltip's content, specify the contentTemplate. Inside the template, you can identify the chart series point for which the tooltip is displayed and thus display information related to that point.

en.wikipedia.org

Backend API

<dx-pie-chart id="pie-chart" [dataSource]="populationData" palette="bright" title="Top 10 Most Populated States in US" > <dxi-pie-chart-series argumentField="name" valueField="population"> </dxi-pie-chart-series> <dxo-pie-chart-tooltip [enabled]="true" contentTemplate="content"> </dxo-pie-chart-tooltip> <dxo-pie-chart-export [enabled]="true"></dxo-pie-chart-export> <div *dxTemplate="let info of 'content'" class="state-tooltip"> <img src="{{ getImagePath(info.point) }}" /><h4 class="state">{{ info.argument }}</h4> <div class="capital"> <span class="caption">Capital</span>: {{ info.point.data.capital }} </div> <div class="population"> <span class="caption">Population</span>: {{ info.value | number : "3.0-0" }} people </div> <div> <span class="caption">Area</span>: <span class="area-km">{{ info.point.data.area | number : "3.0-0" }}</span> km<sup>2</sup> (<span class="area-mi">{{ 0.3861 * info.point.data.area | number : "3.0-0" }}</span> mi<sup>2</sup>) </div> </div> </dx-pie-chart>

import { bootstrapApplication } from '@angular/platform-browser'; import { Component, enableProdMode, provideZoneChangeDetection } from '@angular/core'; import { DecimalPipe } from '@angular/common'; import { DxPieChartModule } from 'devextreme-angular'; import { Service, State } from './app.service'; if (!/localhost/.test(document.location.host)) { enableProdMode(); } @Component({ selector: 'demo-app', providers: [Service], templateUrl: './app.component.html', styleUrls: ['./app.component.css'], imports: [ DxPieChartModule, DecimalPipe, ], }) export class AppComponent { populationData: State[]; constructor(service: Service) { this.populationData = service.getPopulationData(); } getImagePath = ({ data: { name } }) => `../../../../images/flags/${name.replace(/\s/, '')}.svg`; } bootstrapApplication(AppComponent, { providers: [ provideZoneChangeDetection({ eventCoalescing: true, runCoalescing: true }), ], });

::ng-deep #pie-chart { height: 440px; } ::ng-deep .state-tooltip { height: 90px; } ::ng-deep .state-tooltip > img { width: 60px; height: 40px; display: block; margin: 0 5px 0 0; float: left; border: 1px solid rgba(191, 191, 191, 0.25); } ::ng-deep .state-tooltip > h4 { line-height: 40px; font-size: 14px; margin-bottom: 5px; } ::ng-deep .state-tooltip .caption { font-weight: 500; } ::ng-deep .state-tooltip sup { font-size: 0.8em; vertical-align: super; line-height: 0; }

import { Injectable } from '@angular/core'; export interface State { name: string; population: number; capital: string; area: number; } const populationData: State[] = [{ name: 'California', population: 38802500, capital: 'Sacramento', area: 423970, }, { name: 'Texas', population: 26956958, capital: 'Austin', area: 695662, }, { name: 'Florida', population: 19893297, capital: 'Tallahassee', area: 170312, }, { name: 'New York', population: 19746227, capital: 'Albany', area: 141297, }, { name: 'Illinois', population: 12880580, capital: 'Springfield', area: 149995, }, { name: 'Pennsylvania', population: 12787209, capital: 'Harrisburg', area: 119280, }, { name: 'Ohio', population: 11594163, capital: 'Columbus', area: 116098, }, { name: 'Georgia', population: 10097343, capital: 'Atlanta', area: 153910, }, { name: 'North Carolina', population: 9943964, capital: 'Raleigh', area: 139391, }, { name: 'Michigan', population: 9909877, capital: 'Lansing', area: 250487, }]; @Injectable() export class Service { getPopulationData(): State[] { return populationData; } }

<!DOCTYPE html> <html lang="en"> <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=5.0" /> <link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/26.1.5/css/dx.light.css" /> </head> <body class="dx-viewport"> <div class="demo-container"> <demo-app>Loading...</demo-app> </div> <script src="https://cdn.jsdelivr.net/npm/zone.js@0.16.2/bundles/zone.umd.js"></script> <script src="./bundle.js" type="module"></script> </body> </html>