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.
www.wikipedia.org
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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, enableProdMode,
} 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';
if (!/localhost/.test(document.location.host)) {
enableProdMode();
}
@Component({
selector: 'demo-app',
providers: [Service],
templateUrl: 'app/app.component.html',
styleUrls: ['app/app.component.css'],
})
export class AppComponent {
@ViewChild(DxPieChartComponent, { static: false }) chart: DxPieChartComponent;
populationData: Population[];
selectedRegion = '';
constructor(service: Service) {
this.populationData = service.getPopulationData();
}
pointClick(e: any) {
const 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);
::ng-deep .controls-pane {
margin-top: 20px;
text-align: center;
}
::ng-deep .dx-selectbox {
display: inline-block;
}
import { Injectable } from '@angular/core';
export class Population {
region: string;
val: number;
}
const 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 and DevExtreme here:
// https://js.devexpress.com/Documentation/Guide/Angular_Components/Getting_Started/Create_a_DevExtreme_Application/
window.config = {
transpiler: 'ts',
typescriptOptions: {
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emitDecoratorMetadata: true,
experimentalDecorators: true,
},
meta: {
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'exports': 'ts',
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},
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paths: {
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main: './index.js',
defaultExtension: 'js',
},
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defaultExtension: 'js',
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},
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packageConfigPaths: [
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'npm:rxjs@7.5.3/package.json',
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'npm:devexpress-diagram@2.1.72/package.json',
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};
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" />
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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>