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Backend API
<dx-chart
id="chart"
[class]="isFirstLevel ? 'pointer-on-bars' : ''"
[dataSource]="dataSource"
(onPointClick)="onPointClick($event)"
title="The Most Populated Countries by Continents"
[customizePoint]="customizePoint"
>
<dxi-series type="bar"></dxi-series>
<dxo-legend [visible]="false"></dxo-legend>
<dxi-value-axis [showZero]="false"></dxi-value-axis>
</dx-chart>
<dx-button
class="button-container"
text="Back"
icon="chevronleft"
[visible]="!isFirstLevel"
(onClick)="onButtonClick()"
>
</dx-button>
import {
NgModule, Component, ElementRef, enableProdMode,
} from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { DxChartModule, DxButtonModule } from 'devextreme-angular';
import { Service, DataItem } 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 {
dataSource: DataItem[];
colors: string[];
service: Service;
isFirstLevel: boolean;
constructor(service: Service, element: ElementRef) {
this.dataSource = service.filterData('');
this.colors = service.getColors();
this.service = service;
this.isFirstLevel = true;
}
onButtonClick() {
if (!this.isFirstLevel) {
this.isFirstLevel = true;
this.dataSource = this.service.filterData('');
}
}
onPointClick(e) {
if (this.isFirstLevel) {
this.isFirstLevel = false;
this.dataSource = this.service.filterData(e.target.originalArgument);
}
}
customizePoint = () => ({
color: this.colors[Number(this.isFirstLevel)],
...this.isFirstLevel ? {} : {
hoverStyle: {
hatching: 'none',
},
},
});
}
@NgModule({
imports: [
BrowserModule,
DxChartModule,
DxButtonModule,
],
declarations: [AppComponent],
bootstrap: [AppComponent],
})
export class AppModule { }
platformBrowserDynamic().bootstrapModule(AppModule);
#chart {
height: 440px;
width: 100%;
}
::ng-deep #chart.pointer-on-bars .dxc-series rect {
cursor: pointer;
}
.button-container {
text-align: center;
height: 40px;
position: absolute;
top: 7px;
left: 0;
}
import { Injectable } from '@angular/core';
export class DataItem {
arg: string;
val: number;
parentID: string;
}
const data: DataItem[] = [
{ arg: 'Asia', val: 3007613498, parentID: '' },
{ arg: 'North America', val: 493603615, parentID: '' },
{ arg: 'Europe', val: 438575293, parentID: '' },
{ arg: 'Africa', val: 381331438, parentID: '' },
{ arg: 'South America', val: 331126555, parentID: '' },
{ arg: 'Nigeria', val: 181562056, parentID: 'Africa' },
{ arg: 'Egypt', val: 88487396, parentID: 'Africa' },
{ arg: 'Congo', val: 77433744, parentID: 'Africa' },
{ arg: 'Morocco', val: 33848242, parentID: 'Africa' },
{ arg: 'China', val: 1380083000, parentID: 'Asia' },
{ arg: 'India', val: 1306687000, parentID: 'Asia' },
{ arg: 'Pakistan', val: 193885498, parentID: 'Asia' },
{ arg: 'Japan', val: 126958000, parentID: 'Asia' },
{ arg: 'Russia', val: 146804372, parentID: 'Europe' },
{ arg: 'Germany', val: 82175684, parentID: 'Europe' },
{ arg: 'Turkey', val: 79463663, parentID: 'Europe' },
{ arg: 'France', val: 66736000, parentID: 'Europe' },
{ arg: 'United Kingdom', val: 63395574, parentID: 'Europe' },
{ arg: 'United States', val: 325310275, parentID: 'North America' },
{ arg: 'Mexico', val: 121005815, parentID: 'North America' },
{ arg: 'Canada', val: 36048521, parentID: 'North America' },
{ arg: 'Cuba', val: 11239004, parentID: 'North America' },
{ arg: 'Brazil', val: 205737996, parentID: 'South America' },
{ arg: 'Colombia', val: 48400388, parentID: 'South America' },
{ arg: 'Venezuela', val: 30761000, parentID: 'South America' },
{ arg: 'Peru', val: 28220764, parentID: 'South America' },
{ arg: 'Chile', val: 18006407, parentID: 'South America' },
];
const colors: string[] = ['#6babac', '#e55253'];
@Injectable()
export class Service {
filterData(name): DataItem[] {
return data.filter((item) => item.parentID === name);
}
getColors(): string[] {
return colors;
}
}
// 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',
'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',
'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/compiler': {
'esModule': true,
},
'@angular/animations': {
'esModule': true,
},
'@angular/forms': {
'esModule': true,
},
},
paths: {
'npm:': 'https://unpkg.com/',
'bundles:': '../../../../bundles/',
},
map: {
'ts': 'npm:plugin-typescript@4.2.4/lib/plugin.js',
'typescript': 'npm:typescript@4.2.4/lib/typescript.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@24.1.7/cjs',
'@devextreme/runtime': 'npm:@devextreme/runtime@3.0.13',
'devextreme/bundles/dx.all': 'npm:devextreme@24.1.7/bundles/dx.all.js',
'devextreme-quill': 'npm:devextreme-quill@1.7.1/dist/dx-quill.min.js',
'devexpress-diagram': 'npm:devexpress-diagram@2.2.13',
'devexpress-gantt': 'npm:devexpress-gantt@4.1.56',
/* 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`;
return acc;
}, {}),
'jszip': 'npm:jszip@3.10.1/dist/jszip.min.js',
'tslib': 'npm:tslib@2.6.1/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@1.28.1/build/global/luxon.min.js',
'es6-object-assign': 'npm:es6-object-assign@1.1.0',
'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@7.4.11/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@3.0.13/inferno/package.json',
'npm:rxjs@7.5.3/package.json',
'npm:rxjs@7.5.3/operators/package.json',
'npm:devexpress-diagram@2.2.13/package.json',
'npm:devexpress-gantt@4.1.56/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>
<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=5.0" />
<link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/24.1.7/css/dx.light.css" />
<script src="https://unpkg.com/core-js@2.6.12/client/shim.min.js"></script>
<script src="https://unpkg.com/zone.js@0.13.3/bundles/zone.umd.min.js"></script>
<script src="https://unpkg.com/reflect-metadata@0.1.13/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>
Bind to Data
This demo binds the drill-down chart to an array of objects. To visualize hierarchical data in the drill-down chart, filter the data source by the parentID for different drill-down views in the filterData function.
Implement View Navigation
To navigate from the main view to a detailed view, filter the data source by a different parentID in the onPointClick event handler. To navigate back, click the Back button. This action resets the data source filter. Use the isFirstLevel flag to distinguish views.
Customize the Appearance
Use the customizePoint function to change the individual point properties. This function returns an object with properties that should be changed for a certain point. In this demo, this function changes the color and hoverStyle properties.