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.geohive.com
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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:
// https://js.devexpress.com/Documentation/Guide/Angular_Components/Getting_Started/Create_a_DevExtreme_Application/
System.config({
transpiler: 'ts',
typescriptOptions: {
module: "system",
emitDecoratorMetadata: true,
experimentalDecorators: true
},
meta: {
'typescript': {
"exports": "ts"
},
},
paths: {
'npm:': 'https://unpkg.com/'
},
map: {
'ts': 'npm:plugin-typescript@8.0.0/lib/plugin.js',
'typescript': 'npm:typescript@3.4.5/lib/typescript.js',
'@angular': 'npm:@angular',
'tslib': 'npm:tslib/tslib.js',
'rxjs': 'npm:rxjs',
'devextreme': 'npm:devextreme@20.1',
'jszip': 'npm:jszip@3.1.3/dist/jszip.min.js',
'quill': 'npm:quill@1.3.7/dist/quill.js',
'devexpress-diagram': 'npm:devexpress-diagram@1.0.9',
'devexpress-gantt': 'npm:devexpress-gantt@1.0.7',
'devextreme-angular': 'npm:devextreme-angular@20.1'
},
packages: {
'app': {
main: './app.component.ts',
defaultExtension: 'ts'
},
'devextreme': {
defaultExtension: 'js'
},
'devextreme/events/utils': {
main: 'index'
},
'devextreme/events': {
main: 'index'
},
},
packageConfigPaths: [
"npm:*/package.json",
"npm:@angular/*/package.json",
"npm:@angular/common/*/package.json",
"npm:rxjs/operators/package.json",
"npm:devextreme-angular@20.1/*/package.json",
"npm:devextreme-angular@20.1/ui/*/package.json",
]
});
<!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/20.1.6/css/dx.common.css" />
<link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/20.1.6/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@0.10.2/dist/zone.js"></script>
<script src="https://unpkg.com/reflect-metadata@0.1.3/Reflect.js"></script>
<script src="https://unpkg.com/systemjs@0.21.3/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>