Angular Charts - API - Display a Tooltip

import {

  NgModule, Component, ViewChild, enableProdMode,

} from '@angular/core';

import { BrowserModule } from '@angular/platform-browser';

import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';

import { DxPieChartModule, DxPieChartComponent, DxPieChartTypes } from 'devextreme-angular/ui/pie-chart';

import { DxSelectBoxModule, DxSelectBoxTypes } from 'devextreme-angular/ui/select-box';

import { Service, Population } from './app.service';

​

if (!/localhost/.test(document.location.host)) {

  enableProdMode();

}

​

let modulePrefix = '';

// @ts-ignore

if (window && window.config?.packageConfigPaths) {

  modulePrefix = '/app';

}

​

@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({ target: point }: DxPieChartTypes.PointClickEvent) {

    point.showTooltip();

    this.selectedRegion = point.data.region;

  }

​

  valueChanged({ value }: DxSelectBoxTypes.ValueChangedEvent) {

    this.chart.instance.getAllSeries()[0].getPointsByArg(value)[0].showTooltip();

  }

​

  customizeTooltip({ argumentText, valueText }: Record<string, string>) {

    return {

      text: `${argumentText}<br/>${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/

const componentNames = [

  'accordion',

  'action-sheet',

  'autocomplete',

  'bar-gauge',

  'box',

  'bullet',

  'button-group',

  'button',

  'calendar',

  'chart',

  'chat',

  'check-box',

  'circular-gauge',

  'color-box',

  'context-menu',

  'data-grid',

  'date-box',

  'date-range-box',

  'defer-rendering',

  'diagram',

  'draggable',

  'drawer',

  'drop-down-box',

  'drop-down-button',

  'file-manager',

  'file-uploader',

  'filter-builder',

  'form',

  'funnel',

  'gallery',

  'gantt',

  'html-editor',

  'linear-gauge',

  'list',

  'load-indicator',

  'load-panel',

  'lookup',

  'map',

  'menu',

  'multi-view',

  'nested',

  'number-box',

  'pagination',

  'pie-chart',

  'pivot-grid-field-chooser',

  'pivot-grid',

  'polar-chart',

  'popover',

  'popup',

  'progress-bar',

  'radio-group',

  'range-selector',

  'range-slider',

  'recurrence-editor',

  'resizable',

  'responsive-box',

  'sankey',

  'scheduler',

  'scroll-view',

  'select-box',

  'slider',

  'sortable',

  'sparkline',

  'speed-dial-action',

  'splitter',

  'switch',

  'tab-panel',

  'tabs',

  'tag-box',

  'text-area',

  'text-box',

  'tile-view',

  'toast',

  'toolbar',

  'tooltip',

  'tree-list',

  'tree-map',

  'tree-view',

  'validation-group',

  'validation-summary',

  'validator',

  'vector-map',

];

window.exports = window.exports || {};

window.config = {

  transpiler: 'ts',

  typescriptOptions: {

    module: 'system',

    emitDecoratorMetadata: true,

    experimentalDecorators: true,

  },

  meta: {

    'typescript': {

      'exports': 'ts',

    },

    'devextreme/time_zone_utils.js': {

      'esModule': true,

    },

    'devextreme/localization.js': {

      'esModule': true,

    },

    'devextreme/viz/palette.js': {

      'esModule': true,

    },

    '@angular/platform-browser-dynamic': {

      'esModule': true,

    },

    '@angular/platform-browser': {

      'esModule': true,

    },

    '@angular/core': {

      'esModule': true,

    },

    '@angular/common': {

      'esModule': true,

    },

    '@angular/common/http': {

      'esModule': true,

    },

    '@angular/animations': {

      'esModule': true,

    },

    '@angular/forms': {

      'esModule': true,

    },

    'openai': {

      'esModule': true,

    },

  },

  paths: {

    'npm:': 'https://unpkg.com/',

    'bundles:': 'bundles/',

    'externals:': 'bundles/externals/',

  },

  map: {

    'ts': 'npm:plugin-typescript@8.0.0/lib/plugin.js',

    'typescript': 'npm:typescript@4.2.4/lib/typescript.js',

    'jszip': 'npm:jszip@3.10.1/dist/jszip.min.js',

    /* @angular */

    '@angular/compiler': 'bundles:@angular/compiler.umd.js',

    '@angular/platform-browser-dynamic': 'bundles:@angular/platform-browser-dynamic.umd.js',

    '@angular/core': 'bundles:@angular/core.umd.js',

    '@angular/core/primitives/signals': 'bundles:@angular/core.primitives.signals.umd.js',

    '@angular/common': 'bundles:@angular/common.umd.js',

    '@angular/common/http': 'bundles:@angular/common-http.umd.js',

    '@angular/platform-browser': 'bundles:@angular/platform-browser.umd.js',

    '@angular/platform-browser/animations': 'bundles:@angular/platform-browser.umd.js',

    '@angular/forms': 'bundles:@angular/forms.umd.js',

    /* devextreme */

    'devextreme': 'npm:devextreme@24.2.5/cjs',

    '@devextreme/runtime': 'npm:@devextreme/runtime@3.0.12',

    'devextreme/bundles/dx.all': 'npm:devextreme@24.2.5/bundles/dx.all.js',

    'devextreme-quill': 'npm:devextreme-quill@1.7.1/dist/dx-quill.min.js',

    'devexpress-diagram': 'npm:devexpress-diagram@2.2.5',

    'devexpress-gantt': 'npm:devexpress-gantt@4.1.54',

    /* devextreme-angular umd maps */

    'devextreme-angular': 'bundles:devextreme-angular/devextreme-angular.umd.js',

    'devextreme-angular/core': 'bundles:devextreme-angular/devextreme-angular-core.umd.js',

    'devextreme-angular/http': 'bundles:devextreme-angular/devextreme-angular-http.umd.js',

    ...componentNames.reduce((acc, name) => {

      acc[`devextreme-angular/ui/${name}`] = `bundles:devextreme-angular/devextreme-angular-ui-${name}.umd.js`;

      acc[`devextreme-angular/ui/${name}/nested`] = `bundles:devextreme-angular/devextreme-angular-ui-${name}-nested.umd.js`;

      return acc;

    }, {}),

    'tslib': 'npm:tslib/tslib.js',

    'rxjs': 'npm:rxjs@7.5.3/dist/bundles/rxjs.umd.js',

    'rxjs/operators': 'npm:rxjs@7.5.3/dist/cjs/operators/index.js',

    'rrule': 'npm:rrule@2.6.4/dist/es5/rrule.js',

    'luxon': 'npm:luxon@3.4.4/build/global/luxon.min.js',

    'es6-object-assign': 'npm:es6-object-assign',

    'inferno': 'npm:inferno@7.4.11/dist/inferno.min.js',

    'inferno-compat': 'npm:inferno-compat/dist/inferno-compat.min.js',

    'inferno-create-element': 'npm:inferno-create-element@7.4.11/dist/inferno-create-element.min.js',

    'inferno-dom': 'npm:inferno-dom/dist/inferno-dom.min.js',

    'inferno-hydrate': 'npm:inferno-hydrate/dist/inferno-hydrate.min.js',

    'inferno-clone-vnode': 'npm:inferno-clone-vnode/dist/inferno-clone-vnode.min.js',

    'inferno-create-class': 'npm:inferno-create-class/dist/inferno-create-class.min.js',

    'inferno-extras': 'npm:inferno-extras/dist/inferno-extras.min.js',

    // Prettier

    'prettier/standalone': 'npm:prettier@2.8.8/standalone.js',

    'prettier/parser-html': 'npm:prettier@2.8.8/parser-html.js',

  },

  packages: {

    'app': {

      main: './app.component.ts',

      defaultExtension: 'ts',

    },

    'devextreme': {

      defaultExtension: 'js',

    },

    'devextreme/events/utils': {

      main: 'index',

    },

    'devextreme/events': {

      main: 'index',

    },

    'es6-object-assign': {

      main: './index.js',

      defaultExtension: 'js',

    },

    'rxjs': {

      defaultExtension: 'js',

    },

    'rxjs/operators': {

      defaultExtension: 'js',

    },

  },

  packageConfigPaths: [

    'npm:@devextreme/*/package.json',

    'npm:@devextreme/runtime@3.0.12/inferno/package.json',

    'npm:rxjs@7.5.3/package.json',

    'npm:rxjs@7.5.3/operators/package.json',

    'npm:devexpress-diagram@2.2.5/package.json',

    'npm:devexpress-gantt@4.1.54/package.json',

  ],

};

System.config(window.config);

// System.import('@angular/compiler').catch(console.error.bind(console));

​

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml" lang="en">

  <head>↔</head>

​

  <body class="dx-viewport">

    <div class="demo-container">

      <demo-app>Loading...</demo-app>

    </div>

  </body>

</html>

​