Backend API
        
    import React, { useCallback, useState } from 'react';
import Menu, { type MenuTypes } from 'devextreme-react/menu';
import CheckBox, { type CheckBoxTypes } from 'devextreme-react/check-box';
import notify from 'devextreme/ui/notify';
import service from './data.ts';
const SUBMENU_HEIGHT = 200;
const products = service.getProducts();
const App = () => {
  const [limitSubmenuHeight, setLimitSubmenuHeight] = useState(false);
  const itemClick = useCallback((e: MenuTypes.ItemClickEvent) => {
    if (!e.itemData.items) {
      notify(`The "${e.itemData.text}" item was clicked`, 'success', 1500);
    }
  }, []);
  const limitSubmenuHeightOnMouseClick = useCallback((e: CheckBoxTypes.ValueChangedEvent) => {
    setLimitSubmenuHeight(e.value);
  }, [setLimitSubmenuHeight]);
  const onSubmenuShowing = useCallback(({ submenuContainer }: MenuTypes.SubmenuShowingEvent) => {
    submenuContainer.style.maxHeight = limitSubmenuHeight ? `${SUBMENU_HEIGHT}px` : '';
  }, [limitSubmenuHeight]);
  return (
    <div className="demo-container">
      <div className="content">
        <div className="label">Catalog:</div>
        <Menu
          dataSource={products}
          onItemClick={itemClick}
          onSubmenuShowing={onSubmenuShowing}
        />
      </div>
      <div className="options">
        <div className="caption">Options</div>
        <div className="option">
          <CheckBox
            text={`Limit submenu height to ${SUBMENU_HEIGHT}px`}
            value={limitSubmenuHeight}
            onValueChanged={limitSubmenuHeightOnMouseClick}
          />
        </div>
      </div>
    </div>
  );
};
export default App;
    
    import React, { useCallback, useState } from 'react';
import Menu from 'devextreme-react/menu';
import CheckBox from 'devextreme-react/check-box';
import notify from 'devextreme/ui/notify';
import service from './data.js';
const SUBMENU_HEIGHT = 200;
const products = service.getProducts();
const App = () => {
  const [limitSubmenuHeight, setLimitSubmenuHeight] = useState(false);
  const itemClick = useCallback((e) => {
    if (!e.itemData.items) {
      notify(`The "${e.itemData.text}" item was clicked`, 'success', 1500);
    }
  }, []);
  const limitSubmenuHeightOnMouseClick = useCallback(
    (e) => {
      setLimitSubmenuHeight(e.value);
    },
    [setLimitSubmenuHeight],
  );
  const onSubmenuShowing = useCallback(
    ({ submenuContainer }) => {
      submenuContainer.style.maxHeight = limitSubmenuHeight ? `${SUBMENU_HEIGHT}px` : '';
    },
    [limitSubmenuHeight],
  );
  return (
    <div className="demo-container">
      <div className="content">
        <div className="label">Catalog:</div>
        <Menu
          dataSource={products}
          onItemClick={itemClick}
          onSubmenuShowing={onSubmenuShowing}
        />
      </div>
      <div className="options">
        <div className="caption">Options</div>
        <div className="option">
          <CheckBox
            text={`Limit submenu height to ${SUBMENU_HEIGHT}px`}
            value={limitSubmenuHeight}
            onValueChanged={limitSubmenuHeightOnMouseClick}
          />
        </div>
      </div>
    </div>
  );
};
export default App;
    
    import React from 'react';
import ReactDOM from 'react-dom';
import App from './App.tsx';
ReactDOM.render(
  <App />,
  document.getElementById('app'),
);
    
    const products = [
  {
    text: 'Electronics',
    items: [
      {
        text: 'Computers',
        items: [
          {
            text: 'Desktops',
          },
          {
            text: 'Laptops',
          },
          {
            text: 'Tablets',
          },
          {
            text: 'Monitors',
          },
          {
            text: 'Printers',
          },
          {
            text: 'Scanners',
          },
          {
            text: 'Servers',
          },
          {
            text: 'Network Devices',
          },
          {
            text: 'Warranties',
          },
          {
            text: 'Projectors & Screens'
          },
          {
            text: 'Computer Accessories',
          },
        ]
      },
      {
        text: 'Cell Phones',
        items: [
          {
            text: 'Home & Office Phones',
          },
          {
            text: 'Smart Phones & PDAs',
          },
          {
            text: 'Senior Cell Phones'
          },
          {
            text: 'Mobile Broadband Devices',
          },
          {
            text: 'Cell Phone Accessories',
          },
        ]
      },
      {
        text: 'Camera & Photo',
        items: [
          {
            text: 'Action Cameras',
          },
          {
            text: 'Camcorders',
          },
          {
            text: 'Digital Cameras',
          },
          {
            text: 'Digital Picture Frames',
          },
          {
            text: 'Film Cameras',
          },
          {
            text: 'Professional Video Cameras',
          },
          {
            text: 'Flashes',
          },
          {
            text: 'Lenses',
          },
          {
            text: 'Photo Printers',
          },
          {
            text: 'Film & Slide Scanners',
          },
          {
            text: 'Slide Projectors',
          },
          {
            text: 'Slide Viewers',
          },
          {
            text: 'Tripods & Monopods',
          },
          {
            text: 'Underwater Video & Photography',
          },
          {
            text: 'Camera Accessories',
          },
        ]
      },
      {
        text: 'Audio',
        items: [
          {
            text: 'Boomboxes',
          },
          {
            text: 'DVD & CD Player Bags',
          },
          {
            text: 'Hi-Fi & Home Audio Accessories',
          },
          {
            text: 'Media Streaming Devices',
          },
          {
            text: 'MP3 & Digital Media Players',
          },
          {
            text: 'MP3 Player Accessories',
          },
          {
            text: 'Personal Cassette Players',
          },
          {
            text: 'Personal CD Players',
          },
          {
            text: 'Compact Stereos',
          },
          {
            text: 'Speakers',
          },
        ]
      },
      {
        text: 'Home Appliances',
        items: [
          {
            text: 'Air Conditioners',
          },
          {
            text: 'Coffee Machines',
          },
          {
            text: 'Fans',
          },
          {
            text: 'Lamps',
          },
          {
            text: 'Microwaves',
          },
          {
            text: 'Refrigerators',
          },
          {
            text: 'Washers & Dryers'
          },
          {
            text: ' Water Heaters',
          },
          {
            'text': 'Vacuum'
          },
          {
            text: 'Steaming & Ironing'
          }
        ]
      },
    ]
  },
  
  {
    text: 'Entertainment',
    items: [
      {
        text: 'Films & Music',
        items: [
          {
            text: 'TV Shows',
          },
          {
            text: 'DVD',
          },
          {
            text: 'Blu-ray',
          },
          {
            text: 'CD',
          },
          {
            text: 'SACD',
          },
          {
            text: 'Vinyl',
          },
          {
            text: 'Cassette'
          },
          {
            text: 'Musical Instruments',
          },
          {
            text: 'DJ Equipment'
          }
        ]
      },
      {
        text: 'Games & Toys',
        items: [
          {
            text: 'PC Games',
          },
          {
            text: 'Virtual Reality',
          },
          {
            text: 'Boxed Games',
          },
          {
            text: 'Download Games',
          },
          {
            text: 'Handheld Game Systems'
          },
          {
            text: 'Legacy Systems',
          },
          {
            text: 'Cards',
          },
        ]
      },
    ]
  },
  
  {
    text: 'Healthcare & Living',
    items: [
      {
        text: 'Sports & Outdoors',
        items: [
          {
            text: 'Camping',
          },
          {
            text: 'Fitness',
          },
          {
            text: 'Football',
          },
          {
            text: 'Cycling',
          },
          {
            text: 'Running',
          },
          {
            text: 'Sport Electronics',
          },
          {
            text: 'Sport Apparel'
          },
          {
            text: 'Trainers & Tennis Shoes',
          },
        ]
      },
      {
        text: 'Beauty',
        items: [
          {
            text: 'Bath & Shower',
          },
          {
            text: 'Skin Care',
          },
          {
            text: 'Hair Care',
          },
          {
            text: 'Nail Care',
          },
          {
            text: 'Make-up'
          },
          {
            text: 'Fragrance',
          },
          {
            text: 'Salon & SPA Equipment',
          },
          {
            text: 'Tools & Accessories',
          },
        ]
      },
      {
        text: 'Fashion',
        items: [
          {
            text: 'Clothing',
          },
          {
            text: 'Jewellery',
          },
          {
            text: 'Shoes',
          },
          {
            text: 'Handbags & Shoulder Bags',
          },
          {
            text: 'Watches',
          },
          {
            text: 'Accessories',
          }
        ]
      }
    ]
  },
];
export interface ProductItemType {
  text: string;
}
export interface ProductType {
  text: string;
  items: (ProductItemType | ProductType)[];
}
export default {
  getProducts(): ProductType[] {
    return products;
  },
};
    
    window.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://cdn.jsdelivr.net/npm/',
    '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@link:../../packages/devextreme/artifacts/npm/devextreme/cjs',
    'devextreme-react': 'npm:devextreme-react@link:../../packages/devextreme-react/npm/cjs',
    'devextreme-quill': 'npm:devextreme-quill@1.7.6/dist/dx-quill.min.js',
    'devexpress-diagram': 'npm:devexpress-diagram@2.2.24/dist/dx-diagram.js',
    'devexpress-gantt': 'npm:devexpress-gantt@4.1.64/dist/dx-gantt.js',
    'inferno': 'npm:inferno@8.2.3/dist/inferno.min.js',
    'inferno-compat': 'npm:inferno-compat/dist/inferno-compat.min.js',
    'inferno-create-element': 'npm:inferno-create-element@8.2.3/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',
    '@preact/signals-core': 'npm:@preact/signals-core@1.8.0/dist/signals-core.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-react/common': {
      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',
  ],
  babelOptions: {
    sourceMaps: false,
    stage0: true,
    react: true,
  },
};
System.config(window.config);
// eslint-disable-next-line
const useTgzInCSB = ['openai'];
    
    import React from 'react';
import ReactDOM from 'react-dom';
import App from './App.js';
ReactDOM.render(<App />, document.getElementById('app'));
    
    const products = [
  {
    text: 'Electronics',
    items: [
      {
        text: 'Computers',
        items: [
          {
            text: 'Desktops',
          },
          {
            text: 'Laptops',
          },
          {
            text: 'Tablets',
          },
          {
            text: 'Monitors',
          },
          {
            text: 'Printers',
          },
          {
            text: 'Scanners',
          },
          {
            text: 'Servers',
          },
          {
            text: 'Network Devices',
          },
          {
            text: 'Warranties',
          },
          {
            text: 'Projectors & Screens',
          },
          {
            text: 'Computer Accessories',
          },
        ],
      },
      {
        text: 'Cell Phones',
        items: [
          {
            text: 'Home & Office Phones',
          },
          {
            text: 'Smart Phones & PDAs',
          },
          {
            text: 'Senior Cell Phones',
          },
          {
            text: 'Mobile Broadband Devices',
          },
          {
            text: 'Cell Phone Accessories',
          },
        ],
      },
      {
        text: 'Camera & Photo',
        items: [
          {
            text: 'Action Cameras',
          },
          {
            text: 'Camcorders',
          },
          {
            text: 'Digital Cameras',
          },
          {
            text: 'Digital Picture Frames',
          },
          {
            text: 'Film Cameras',
          },
          {
            text: 'Professional Video Cameras',
          },
          {
            text: 'Flashes',
          },
          {
            text: 'Lenses',
          },
          {
            text: 'Photo Printers',
          },
          {
            text: 'Film & Slide Scanners',
          },
          {
            text: 'Slide Projectors',
          },
          {
            text: 'Slide Viewers',
          },
          {
            text: 'Tripods & Monopods',
          },
          {
            text: 'Underwater Video & Photography',
          },
          {
            text: 'Camera Accessories',
          },
        ],
      },
      {
        text: 'Audio',
        items: [
          {
            text: 'Boomboxes',
          },
          {
            text: 'DVD & CD Player Bags',
          },
          {
            text: 'Hi-Fi & Home Audio Accessories',
          },
          {
            text: 'Media Streaming Devices',
          },
          {
            text: 'MP3 & Digital Media Players',
          },
          {
            text: 'MP3 Player Accessories',
          },
          {
            text: 'Personal Cassette Players',
          },
          {
            text: 'Personal CD Players',
          },
          {
            text: 'Compact Stereos',
          },
          {
            text: 'Speakers',
          },
        ],
      },
      {
        text: 'Home Appliances',
        items: [
          {
            text: 'Air Conditioners',
          },
          {
            text: 'Coffee Machines',
          },
          {
            text: 'Fans',
          },
          {
            text: 'Lamps',
          },
          {
            text: 'Microwaves',
          },
          {
            text: 'Refrigerators',
          },
          {
            text: 'Washers & Dryers',
          },
          {
            text: ' Water Heaters',
          },
          {
            text: 'Vacuum',
          },
          {
            text: 'Steaming & Ironing',
          },
        ],
      },
    ],
  },
  {
    text: 'Entertainment',
    items: [
      {
        text: 'Films & Music',
        items: [
          {
            text: 'TV Shows',
          },
          {
            text: 'DVD',
          },
          {
            text: 'Blu-ray',
          },
          {
            text: 'CD',
          },
          {
            text: 'SACD',
          },
          {
            text: 'Vinyl',
          },
          {
            text: 'Cassette',
          },
          {
            text: 'Musical Instruments',
          },
          {
            text: 'DJ Equipment',
          },
        ],
      },
      {
        text: 'Games & Toys',
        items: [
          {
            text: 'PC Games',
          },
          {
            text: 'Virtual Reality',
          },
          {
            text: 'Boxed Games',
          },
          {
            text: 'Download Games',
          },
          {
            text: 'Handheld Game Systems',
          },
          {
            text: 'Legacy Systems',
          },
          {
            text: 'Cards',
          },
        ],
      },
    ],
  },
  {
    text: 'Healthcare & Living',
    items: [
      {
        text: 'Sports & Outdoors',
        items: [
          {
            text: 'Camping',
          },
          {
            text: 'Fitness',
          },
          {
            text: 'Football',
          },
          {
            text: 'Cycling',
          },
          {
            text: 'Running',
          },
          {
            text: 'Sport Electronics',
          },
          {
            text: 'Sport Apparel',
          },
          {
            text: 'Trainers & Tennis Shoes',
          },
        ],
      },
      {
        text: 'Beauty',
        items: [
          {
            text: 'Bath & Shower',
          },
          {
            text: 'Skin Care',
          },
          {
            text: 'Hair Care',
          },
          {
            text: 'Nail Care',
          },
          {
            text: 'Make-up',
          },
          {
            text: 'Fragrance',
          },
          {
            text: 'Salon & SPA Equipment',
          },
          {
            text: 'Tools & Accessories',
          },
        ],
      },
      {
        text: 'Fashion',
        items: [
          {
            text: 'Clothing',
          },
          {
            text: 'Jewellery',
          },
          {
            text: 'Shoes',
          },
          {
            text: 'Handbags & Shoulder Bags',
          },
          {
            text: 'Watches',
          },
          {
            text: 'Accessories',
          },
        ],
      },
    ],
  },
];
export default {
  getProducts() {
    return products;
  },
};
    
    <!DOCTYPE html>
<html 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/25.1.6/css/dx.light.css" />
    <link rel="stylesheet" type="text/css" href="styles.css" />
    <script src="https://cdn.jsdelivr.net/npm/core-js@2.6.12/client/shim.min.js"></script>
    <script src="https://cdn.jsdelivr.net/npm/systemjs@0.21.3/dist/system.js"></script>
    <script type="text/javascript" src="config.js"></script>
    <script type="text/javascript">
      System.import("./index.tsx");
    </script>
  </head>
  <body class="dx-viewport">
    <div id="app"></div>
  </body>
</html>
    
    .demo-container {
  display: flex;
}
.label {
  font-size: 22px;
  padding-bottom: 24px;
}
.content {
  flex-grow: 1;
  width: 100%;
  min-width: 500px;
  overflow: clip;
}
.options {
  display: flex;
  flex-direction: column;
  padding: 20px;
  background-color: rgba(191, 191, 191, 0.15);
}
.caption {
  font-size: 18px;
  font-weight: 500;
}
.option {
  margin-top: 10px;
}