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) {
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);
::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;
}
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 and DevExtreme here:
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};
System.config(window.config);
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