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Angular Charts - Small Value Groups

DevExtreme PieChart supports small value grouping operations. To enable this functionality, configure the smallValuesGrouping object within series or commonSeriesSettings. This demo sets smallValuesGrouping.mode to "smallValueThreshold" and specifies the threshold property.

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Backend API
<dx-pie-chart id="pie" title="Top internet languages" palette="bright" [dataSource]="internetLanguages" > <dxo-pie-chart-legend horizontalAlignment="center" verticalAlignment="bottom" ></dxo-pie-chart-legend> <dxo-pie-chart-export [enabled]="true"></dxo-pie-chart-export> <dxi-pie-chart-series argumentField="language" valueField="percent"> <dxo-pie-chart-label [visible]="true" format="fixedPoint" [customizeText]="customizeLabel" > <dxo-pie-chart-connector [visible]="true" [width]="0.5" ></dxo-pie-chart-connector> </dxo-pie-chart-label> <dxo-pie-chart-small-values-grouping mode="smallValueThreshold" [threshold]="4.5" ></dxo-pie-chart-small-values-grouping> </dxi-pie-chart-series> </dx-pie-chart>
import { bootstrapApplication } from '@angular/platform-browser'; import { Component, enableProdMode, provideZoneChangeDetection } from '@angular/core'; import { DxPieChartModule } from 'devextreme-angular'; import { LanguageData, Service } from './app.service'; if (!/localhost/.test(document.location.host)) { enableProdMode(); } @Component({ selector: 'demo-app', templateUrl: './app.component.html', styleUrls: ['./app.component.css'], providers: [Service], imports: [ DxPieChartModule, ], }) export class AppComponent { internetLanguages: LanguageData[]; constructor(service: Service) { this.internetLanguages = service.getLanguagesData(); } customizeLabel(point) { return `${point.argumentText}: ${point.valueText}%`; } } bootstrapApplication(AppComponent, { providers: [ provideZoneChangeDetection({ eventCoalescing: true, runCoalescing: true }), ], });
::ng-deep #pie { height: 440px; }
import { Injectable, } from '@angular/core'; export class LanguageData { language: string; percent: number; } const languages: LanguageData[] = [{ language: 'English', percent: 55.5, }, { language: 'Chinese', percent: 2.8, }, { language: 'Spanish', percent: 4.6, }, { language: 'Japanese', percent: 5.0, }, { language: 'Portuguese', percent: 2.5, }, { language: 'German', percent: 5.8, }, { language: 'French', percent: 4.0, }, { language: 'Russian', percent: 5.9, }, { language: 'Italian', percent: 1.9, }, { language: 'Polish', percent: 1.7, }, { language: 'Turkish', percent: 1.5, }, { language: 'Dutch', percent: 1.3, }, { language: 'Persian', percent: 0.9, }, { language: 'Arabic', percent: 0.8, }, { language: 'Korean', percent: 0.7, }, { language: 'Czech', percent: 0.7, }, { language: 'Swedish', percent: 0.5, }, { language: 'Vietnamese', percent: 0.4, }, { language: 'Indonesian', percent: 0.4, }, { language: 'Greek', percent: 0.4, }, { language: 'Romanian', percent: 0.4, }, { language: 'Hungarian', percent: 0.3, }, { language: 'Danish', percent: 0.3, }, { language: 'Thai', percent: 0.3, }, { language: 'Finnish', percent: 0.2, }, { language: 'Slovak', percent: 0.2, }, { language: 'Bulgarian', percent: 0.2, }, { language: 'Norwegian', percent: 0.2, }, { language: 'Hebrew', percent: 0.1, }, { language: 'Lithuanian', percent: 0.1, }, { language: 'Croatian', percent: 0.1, }, { language: 'Ukrainian', percent: 0.1, }, { language: 'Norwegian Bokmål', percent: 0.1, }, { language: 'Serbian', percent: 0.1, }, { language: 'Catalan', percent: 0.1, }, { language: 'Slovenian', percent: 0.1, }, { language: 'Latvian', percent: 0.1, }, { language: 'Estonian', percent: 0.1, }]; @Injectable() export class Service { getLanguagesData(): LanguageData[] { return languages; } }
<!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>

You can also set smallValuesGrouping.mode to "topN". In this mode, our PieChart displays a predefined number of large data points (specified with topCount) and groups the rest.