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Backend API
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import React, { useCallback, useState } from 'react';import SelectBox, { type SelectBoxTypes } from 'devextreme-react/select-box';import PieChart, { Series, Label, Margin, Export, Legend, Animation, IPieChartOptions,} from 'devextreme-react/pie-chart';import { dataSource, resolutionModeLabel } from './data.ts';const resolveModes: (IPieChartOptions['resolveLabelOverlapping'])[] = ['shift', 'hide', 'none'];function formatText(arg: { argumentText: string; percentText: string; }) { return `${arg.argumentText} (${arg.percentText})`;}function App() { const [resolveMode, setResolveMode] = useState(resolveModes[0]); const handleResolveModeChange = useCallback((data: SelectBoxTypes.ValueChangedEvent) => { setResolveMode(data.value); }, [setResolveMode]); return ( <React.Fragment> <PieChart id="pie" dataSource={dataSource} palette="Bright" title="Olympic Medals in 2008" resolveLabelOverlapping={resolveMode} > <Series argumentField="country" valueField="medals" > <Label visible={true} customizeText={formatText} /> </Series> <Margin bottom={20} /> <Export enabled={true} /> <Legend visible={false} /> <Animation enabled={false} /> </PieChart> <div className="options"> <div className="caption">Options</div> <div className="option"> <span>Label Overlapping Resolution Mode </span> <SelectBox dataSource={resolveModes} inputAttr={resolutionModeLabel} value={resolveMode} onValueChanged={handleResolveModeChange} /> </div> </div> </React.Fragment> );}export default App;xxxxxxxxxximport React, { useCallback, useState } from 'react';import SelectBox from 'devextreme-react/select-box';import PieChart, { Series, Label, Margin, Export, Legend, Animation,} from 'devextreme-react/pie-chart';import { dataSource, resolutionModeLabel } from './data.js';const resolveModes = ['shift', 'hide', 'none'];function formatText(arg) { return `${arg.argumentText} (${arg.percentText})`;}function App() { const [resolveMode, setResolveMode] = useState(resolveModes[0]); const handleResolveModeChange = useCallback( (data) => { setResolveMode(data.value); }, [setResolveMode], ); return ( <React.Fragment> <PieChart id="pie" dataSource={dataSource} palette="Bright" title="Olympic Medals in 2008" resolveLabelOverlapping={resolveMode} > <Series argumentField="country" valueField="medals" > <Label visible={true} customizeText={formatText} /> </Series> <Margin bottom={20} /> <Export enabled={true} /> <Legend visible={false} /> <Animation enabled={false} /> </PieChart> <div className="options"> <div className="caption">Options</div> <div className="option"> <span>Label Overlapping Resolution Mode </span> <SelectBox dataSource={resolveModes} inputAttr={resolutionModeLabel} value={resolveMode} onValueChanged={handleResolveModeChange} /> </div> </div> </React.Fragment> );}export default App;xxxxxxxxxximport React from 'react';import ReactDOM from 'react-dom';import App from './App.tsx';ReactDOM.render( <App />, document.getElementById('app'),);xxxxxxxxxxexport const dataSource = [{ country: 'USA', medals: 112,}, { country: 'China', medals: 100,}, { country: 'Russia', medals: 60,}, { country: 'Britain', medals: 49,}, { country: 'Australia', medals: 46,}, { country: 'France', medals: 43,}, { country: 'Germany', medals: 41,}, { country: 'South Korea', medals: 32,}, { country: 'Cuba', medals: 29,}, { country: 'Italy', medals: 27,}, { country: 'Japan', medals: 25,}, { country: 'Ukraine', medals: 22,}, { country: 'Canada', medals: 20,}, { country: 'Spain', medals: 19,}];export const resolutionModeLabel = { 'aria-label': 'Resolution Mode' };xxxxxxxxxxwindow.exports = window.exports || {};window.config = { transpiler: 'ts', typescriptOptions: { module: 'system', emitDecoratorMetadata: true, experimentalDecorators: true, jsx: 'react', }, meta: { 'react': { 'esModule': true, }, 'typescript': { 'exports': 'ts', }, 'devextreme/time_zone_utils.js': { 'esModule': true, }, 'devextreme/localization.js': { 'esModule': true, }, 'devextreme/viz/palette.js': { 'esModule': true, }, 'openai': { 'esModule': true, }, }, paths: { 'npm:': 'https://unpkg.com/', 'bundles:': 'bundles/', 'externals:': 'bundles/externals/', }, defaultExtension: 'js', 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', 'react': 'npm:react@17.0.2/umd/react.development.js', 'react-dom': 'npm:react-dom@17.0.2/umd/react-dom.development.js', 'prop-types': 'npm:prop-types/prop-types.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', 'devextreme': 'npm:devextreme@24.2.6/cjs', 'devextreme-react': 'npm:devextreme-react@24.2.6/cjs', 'devextreme-quill': 'npm:devextreme-quill@1.7.1/dist/dx-quill.min.js', 'devexpress-diagram': 'npm:devexpress-diagram@2.2.15/dist/dx-diagram.js', 'devexpress-gantt': 'npm:devexpress-gantt@4.1.60/dist/dx-gantt.js', '@devextreme/runtime': 'npm:@devextreme/runtime@3.0.12', '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', 'devextreme-cldr-data': 'npm:devextreme-cldr-data@1.0.3', // SystemJS plugins 'plugin-babel': 'npm:systemjs-plugin-babel@0.0.25/plugin-babel.js', 'systemjs-babel-build': 'npm:systemjs-plugin-babel@0.0.25/systemjs-babel-browser.js', // Prettier 'prettier/standalone': 'npm:prettier@2.8.8/standalone.js', 'prettier/parser-html': 'npm:prettier@2.8.8/parser-html.js', }, packages: { 'devextreme': { defaultExtension: 'js', }, 'devextreme-react': { main: 'index.js', }, 'devextreme/events/utils': { main: 'index', }, 'devextreme/common/core/events/utils': { main: 'index', }, 'devextreme/localization/messages': { format: 'json', defaultExtension: 'json', }, 'devextreme/events': { main: 'index', }, 'es6-object-assign': { main: './index.js', defaultExtension: 'js', }, }, packageConfigPaths: [ 'npm:@devextreme/*/package.json', 'npm:@devextreme/runtime@3.0.12/inferno/package.json', ], babelOptions: { sourceMaps: false, stage0: true, react: true, },};System.config(window.config);xxxxxxxxxximport React from 'react';import ReactDOM from 'react-dom';import App from './App.js';ReactDOM.render(<App />, document.getElementById('app'));xxxxxxxxxxexport const dataSource = [ { country: 'USA', medals: 112, }, { country: 'China', medals: 100, }, { country: 'Russia', medals: 60, }, { country: 'Britain', medals: 49, }, { country: 'Australia', medals: 46, }, { country: 'France', medals: 43, }, { country: 'Germany', medals: 41, }, { country: 'South Korea', medals: 32, }, { country: 'Cuba', medals: 29, }, { country: 'Italy', medals: 27, }, { country: 'Japan', medals: 25, }, { country: 'Ukraine', medals: 22, }, { country: 'Canada', medals: 20, }, { country: 'Spain', medals: 19, },];export const resolutionModeLabel = { 'aria-label': 'Resolution Mode' };xxxxxxxxxx<html lang="en"> <head></head> <body class="dx-viewport"> <div class="demo-container"> <div id="app"></div> </div> </body></html>xxxxxxxxxx.options { padding: 20px; background-color: rgba(191, 191, 191, 0.15); margin-top: 20px;}.option { margin-top: 10px; display: flex; align-items: center;}.caption { font-size: 18px; font-weight: 500;}.option > span { margin-right: 10px;}.option > .dx-widget { display: inline-block; vertical-align: middle;}