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Charts

API - Display a Tooltip

Documentation
This demo illustrates how to show and hide the point’s tooltip with the API. To test this feature, select a continent from the drop-down menu under the PieChart or click a point directly in the PieChart.
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<dx-pie-chart id="chart" type="doughnut" [dataSource]="populationData" palette="Soft Pastel" title="The Population of Continents and Regions" (onPointClick)="pointClick($event)"> <dxi-series argumentField="region"></dxi-series> <dxo-tooltip [enabled]="false" format="millions" [customizeTooltip]="customizeTooltip"> </dxo-tooltip> <dxo-size [height]="350"></dxo-size> <dxo-legend [visible]="false"></dxo-legend> </dx-pie-chart> <div class="controls-pane"> <dx-select-box [width]="250" [dataSource]="populationData" displayExpr="region" valueExpr="region" placeholder="Choose region" [value]="selectedRegion" (onValueChanged)="valueChanged($event)"> </dx-select-box> </div>
import { NgModule, Component, ViewChild } from '@angular/core'; import { BrowserModule } from '@angular/platform-browser'; import { platformBrowserDynamic } from '@angular/platform-browser-dynamic'; import { DxPieChartModule, DxSelectBoxModule, DxPieChartComponent } from 'devextreme-angular'; import { Service, Population } from './app.service'; @Component({ selector: 'demo-app', providers: [Service], templateUrl: 'app/app.component.html', styleUrls: ['app/app.component.css'] }) export class AppComponent { @ViewChild(DxPieChartComponent) chart: DxPieChartComponent; populationData: Population[]; selectedRegion = ""; constructor(service: Service) { this.populationData = service.getPopulationData(); } pointClick(e: any) { var point = e.target; point.showTooltip(); this.selectedRegion = point.argument; } valueChanged(e: any) { this.chart.instance.getAllSeries()[0].getPointsByArg(e.value)[0].showTooltip(); } customizeTooltip(arg: any) { return { text: arg.argumentText + "<br/>" + arg.valueText }; } } @NgModule({ imports: [ BrowserModule, DxPieChartModule, DxSelectBoxModule ], declarations: [AppComponent], bootstrap: [AppComponent] }) export class AppModule { } platformBrowserDynamic().bootstrapModule(AppModule);
/deep/ .controls-pane { margin-top: 20px; text-align: center; } /deep/ .dx-selectbox { display: inline-block; }
import { Injectable } from '@angular/core'; export class Population { region: string; val: number; } let populationData: Population[] = [{ region: "Asia", val: 4119626293 }, { region: "Africa", val: 1012956064 }, { region: "Northern America", val: 344124520 }, { region: "Latin America and the Caribbean", val: 590946440 }, { region: "Europe", val: 727082222 }, { region: "Oceania", val: 35104756 }]; @Injectable() export class Service { getPopulationData(): Population[] { return populationData; } }
// In real applications, you should not transpile code in the browser. You can see how to create your own application with Angular 2 and DevExtreme here: // https://github.com/DevExpress/devextreme-angular/blob/master/README.md System.config({ transpiler: 'ts', typescriptOptions: { module: "commonjs", emitDecoratorMetadata: true, experimentalDecorators: true }, meta: { 'typescript': { "exports": "ts" } }, paths: { 'npm:': 'https://unpkg.com/' }, map: { 'ts': 'npm:plugin-typescript@7.0.6/lib/plugin.js', 'typescript': 'npm:typescript@2.2.2/lib/typescript.js', '@angular/core': 'npm:@angular/core@4.1.0/bundles/core.umd.js', '@angular/common': 'npm:@angular/common@4.1.0/bundles/common.umd.js', '@angular/compiler': 'npm:@angular/compiler@4.1.0/bundles/compiler.umd.js', '@angular/platform-browser': 'npm:@angular/platform-browser@4.1.0/bundles/platform-browser.umd.js', '@angular/platform-browser-dynamic': 'npm:@angular/platform-browser-dynamic@4.1.0/bundles/platform-browser-dynamic.umd.js', '@angular/http': 'npm:@angular/http@4.1.0/bundles/http.umd.js', '@angular/router': 'npm:@angular/router@4.1.0/bundles/router.umd.js', '@angular/forms': 'npm:@angular/forms@4.1.0/bundles/forms.umd.js', 'rxjs': 'npm:rxjs@5.3.1', 'jszip': 'npm:jszip@3.1.3/dist/jszip.min.js', 'devextreme': 'npm:devextreme@17.1', 'jquery': 'npm:jquery@3.1.1/dist/jquery.min.js', 'devextreme-angular': 'npm:devextreme-angular@17.1' }, packages: { 'app': { main: './app.component.ts', defaultExtension: 'ts' }, 'devextreme': { defaultExtension: 'js' }, 'devextreme-angular': { main: 'index.js', defaultExtension: 'js' } } });
<!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/17.1.3/css/dx.spa.css" /> <link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/17.1.3/css/dx.common.css" /> <link rel="dx-theme" data-theme="generic.light" href="https://cdn3.devexpress.com/jslib/17.1.3/css/dx.light.css" /> <script src="https://unpkg.com/core-js@2.4.1/client/shim.min.js"></script> <script src="https://unpkg.com/zone.js@0.6.25/dist/zone.js"></script> <script src="https://unpkg.com/reflect-metadata@0.1.3/Reflect.js"></script> <script src="https://unpkg.com/systemjs@0.19.31/dist/system.js"></script> <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>