Backend API
        
    import React, { useCallback, useRef, useState } from 'react';
import Scheduler, { Resource, type SchedulerTypes, SchedulerRef } from 'devextreme-react/scheduler';
import ContextMenu, { type ContextMenuTypes } from 'devextreme-react/context-menu';
import { data, resourcesData, Resource as ResourceItem } from './data.ts';
import AppointmentMenuTemplate from './AppointmentTemplate.tsx';
// eslint-disable-next-line no-unused-vars
type ContextMenuItem = ContextMenuTypes.Item & ResourceItem & { onItemClick?: (e: ContextMenuTypes.ItemClickEvent) => void };
const views: SchedulerTypes.ViewType[] = ['day', 'month'];
const appointmentClassName = '.dx-scheduler-appointment';
const cellClassName = '.dx-scheduler-date-table-cell';
const onContextMenuItemClick = (e: ContextMenuTypes.ItemClickEvent) => {
  (e.itemData as ContextMenuItem).onItemClick?.(e);
};
const App = () => {
  const schedulerRef = useRef<SchedulerRef>(null);
  const [currentDate, setCurrentDate] = useState(new Date(2020, 10, 25));
  const [contextMenuItems, setContextMenuItems] = useState<ContextMenuItem[]>([]);
  const [target, setTarget] = useState(appointmentClassName);
  const [disabled, setDisabled] = useState(true);
  const [groups, setGroups] = useState<string[] | undefined>(undefined);
  const [crossScrollingEnabled, setCrossScrollingEnabled] = useState(false);
  const onAppointmentContextMenu = useCallback((event: SchedulerTypes.AppointmentContextMenuEvent) => {
    const { appointmentData, targetedAppointmentData } = event;
    const scheduler = schedulerRef.current?.instance();
    const resourceItems: ContextMenuItem[] = resourcesData.map((item) => ({
      ...item,
      onItemClick: (e) => scheduler?.updateAppointment(appointmentData, {
        ...appointmentData,
        ...{ roomId: [(e.itemData as ContextMenuItem).id] },
      }),
    }));
    setTarget(appointmentClassName);
    setDisabled(false);
    setContextMenuItems([
      {
        text: 'Open',
        onItemClick: () => scheduler?.showAppointmentPopup(appointmentData),
      },
      {
        text: 'Delete',
        onItemClick: () => scheduler?.deleteAppointment(appointmentData),
      },
      {
        text: 'Repeat Weekly',
        beginGroup: true,
        onItemClick: () => scheduler?.updateAppointment(appointmentData, {
          startDate: targetedAppointmentData?.startDate,
          recurrenceRule: 'FREQ=WEEKLY',
        }),
      },
      {
        text: 'Set Room',
        beginGroup: true,
        disabled: true,
      },
      ...resourceItems,
    ]);
  }
  , []);
  const onCellContextMenu = useCallback((e: SchedulerTypes.CellContextMenuEvent) => {
    const scheduler = schedulerRef.current?.instance();
    setTarget(cellClassName);
    setDisabled(false);
    setContextMenuItems([
      {
        text: 'New Appointment',
        onItemClick: () => scheduler?.showAppointmentPopup(
          { startDate: e.cellData.startDateUTC },
          true,
        ),
      },
      {
        text: 'New Recurring Appointment',
        onItemClick: () => scheduler?.showAppointmentPopup(
          {
            startDate: e.cellData.startDateUTC,
            recurrenceRule: 'FREQ=DAILY',
          },
          true,
        ),
      },
      {
        text: 'Group by Room/Ungroup',
        beginGroup: true,
        onItemClick: () => {
          if (groups) {
            setCrossScrollingEnabled(false);
            setGroups(undefined);
          } else {
            setCrossScrollingEnabled(true);
            setGroups(['roomId']);
          }
        },
      },
      {
        text: 'Go to Today',
        onItemClick: () => {
          setCurrentDate(new Date());
        },
      },
    ]);
  }, [groups]);
  return (
    <React.Fragment>
      <Scheduler
        ref={schedulerRef}
        timeZone="America/Los_Angeles"
        dataSource={data}
        views={views}
        groups={groups}
        crossScrollingEnabled={crossScrollingEnabled}
        defaultCurrentView="month"
        currentDate={currentDate}
        startDayHour={9}
        recurrenceEditMode="series"
        onAppointmentContextMenu={onAppointmentContextMenu}
        onCellContextMenu={onCellContextMenu}
        height={730}
      >
        <Resource
          dataSource={resourcesData}
          fieldExpr="roomId"
          label="Room"
        />
      </Scheduler>
      <ContextMenu
        dataSource={contextMenuItems}
        width={200}
        target={target}
        disabled={disabled}
        onItemClick={onContextMenuItemClick}
        itemComponent={AppointmentMenuTemplate}
      />
    </React.Fragment>
  );
};
export default App;
    
    import React, { useCallback, useRef, useState } from 'react';
import Scheduler, { Resource } from 'devextreme-react/scheduler';
import ContextMenu from 'devextreme-react/context-menu';
import { data, resourcesData } from './data.js';
import AppointmentMenuTemplate from './AppointmentTemplate.js';
const views = ['day', 'month'];
const appointmentClassName = '.dx-scheduler-appointment';
const cellClassName = '.dx-scheduler-date-table-cell';
const onContextMenuItemClick = (e) => {
  e.itemData.onItemClick?.(e);
};
const App = () => {
  const schedulerRef = useRef(null);
  const [currentDate, setCurrentDate] = useState(new Date(2020, 10, 25));
  const [contextMenuItems, setContextMenuItems] = useState([]);
  const [target, setTarget] = useState(appointmentClassName);
  const [disabled, setDisabled] = useState(true);
  const [groups, setGroups] = useState(undefined);
  const [crossScrollingEnabled, setCrossScrollingEnabled] = useState(false);
  const onAppointmentContextMenu = useCallback((event) => {
    const { appointmentData, targetedAppointmentData } = event;
    const scheduler = schedulerRef.current?.instance();
    const resourceItems = resourcesData.map((item) => ({
      ...item,
      onItemClick: (e) =>
        scheduler?.updateAppointment(appointmentData, {
          ...appointmentData,
          ...{ roomId: [e.itemData.id] },
        }),
    }));
    setTarget(appointmentClassName);
    setDisabled(false);
    setContextMenuItems([
      {
        text: 'Open',
        onItemClick: () => scheduler?.showAppointmentPopup(appointmentData),
      },
      {
        text: 'Delete',
        onItemClick: () => scheduler?.deleteAppointment(appointmentData),
      },
      {
        text: 'Repeat Weekly',
        beginGroup: true,
        onItemClick: () =>
          scheduler?.updateAppointment(appointmentData, {
            startDate: targetedAppointmentData?.startDate,
            recurrenceRule: 'FREQ=WEEKLY',
          }),
      },
      {
        text: 'Set Room',
        beginGroup: true,
        disabled: true,
      },
      ...resourceItems,
    ]);
  }, []);
  const onCellContextMenu = useCallback(
    (e) => {
      const scheduler = schedulerRef.current?.instance();
      setTarget(cellClassName);
      setDisabled(false);
      setContextMenuItems([
        {
          text: 'New Appointment',
          onItemClick: () =>
            scheduler?.showAppointmentPopup({ startDate: e.cellData.startDateUTC }, true),
        },
        {
          text: 'New Recurring Appointment',
          onItemClick: () =>
            scheduler?.showAppointmentPopup(
              {
                startDate: e.cellData.startDateUTC,
                recurrenceRule: 'FREQ=DAILY',
              },
              true,
            ),
        },
        {
          text: 'Group by Room/Ungroup',
          beginGroup: true,
          onItemClick: () => {
            if (groups) {
              setCrossScrollingEnabled(false);
              setGroups(undefined);
            } else {
              setCrossScrollingEnabled(true);
              setGroups(['roomId']);
            }
          },
        },
        {
          text: 'Go to Today',
          onItemClick: () => {
            setCurrentDate(new Date());
          },
        },
      ]);
    },
    [groups],
  );
  return (
    <React.Fragment>
      <Scheduler
        ref={schedulerRef}
        timeZone="America/Los_Angeles"
        dataSource={data}
        views={views}
        groups={groups}
        crossScrollingEnabled={crossScrollingEnabled}
        defaultCurrentView="month"
        currentDate={currentDate}
        startDayHour={9}
        recurrenceEditMode="series"
        onAppointmentContextMenu={onAppointmentContextMenu}
        onCellContextMenu={onCellContextMenu}
        height={730}
      >
        <Resource
          dataSource={resourcesData}
          fieldExpr="roomId"
          label="Room"
        />
      </Scheduler>
      <ContextMenu
        dataSource={contextMenuItems}
        width={200}
        target={target}
        disabled={disabled}
        onItemClick={onContextMenuItemClick}
        itemComponent={AppointmentMenuTemplate}
      />
    </React.Fragment>
  );
};
export default App;
    
    import React from 'react';
type AppointmentMenuTemplateProps = {
  data: {
    color: string;
    text: string;
  }
};
const AppointmentMenuTemplate = (props: AppointmentMenuTemplateProps) => (
  <div>
    {props.data.color && <div className="item-badge" style={{ backgroundColor: props.data.color }} />}
    {props.data.text}
  </div>
);
export default AppointmentMenuTemplate;
    
    import React from 'react';
import ReactDOM from 'react-dom';
import App from './App.tsx';
ReactDOM.render(
  <App />,
  document.getElementById('app'),
);
    
    import { SchedulerTypes } from 'devextreme-react/scheduler';
type Appointment = SchedulerTypes.Appointment & { roomId: number[] };
export type Resource = {
  id?: number;
  text: string;
  color?: string;
};
export const data: Appointment[] = [
  {
    text: 'Watercolor Landscape',
    roomId: [1],
    startDate: new Date('2020-11-01T17:30:00.000Z'),
    endDate: new Date('2020-11-01T19:00:00.000Z'),
    recurrenceRule: 'FREQ=WEEKLY;BYDAY=MO,TH;COUNT=10',
  }, {
    text: 'Oil Painting for Beginners',
    roomId: [2],
    startDate: new Date('2020-11-01T17:30:00.000Z'),
    endDate: new Date('2020-11-01T19:00:00.000Z'),
    recurrenceRule: 'FREQ=WEEKLY;BYDAY=SU,WE;COUNT=10',
  }, {
    text: 'Testing',
    roomId: [3],
    startDate: new Date('2020-11-01T20:00:00.000Z'),
    endDate: new Date('2020-11-01T21:00:00.000Z'),
    recurrenceRule: 'FREQ=WEEKLY;BYDAY=SU;WKST=TU;INTERVAL=2;COUNT=2',
  }, {
    text: 'Meeting of Instructors',
    roomId: [4],
    startDate: new Date('2020-11-01T17:00:00.000Z'),
    endDate: new Date('2020-11-01T17:15:00.000Z'),
    recurrenceRule: 'FREQ=DAILY;BYDAY=TU;UNTIL=20201203',
  }, {
    text: 'Recruiting students',
    roomId: [5],
    startDate: new Date('2020-10-24T18:00:00.000Z'),
    endDate: new Date('2020-10-24T19:00:00.000Z'),
    recurrenceRule: 'FREQ=YEARLY;BYWEEKNO=50;WKST=SU',
    recurrenceException: '20201212T190000Z',
  }, {
    text: 'Final exams',
    roomId: [3],
    startDate: new Date('2020-10-24T20:00:00.000Z'),
    endDate: new Date('2020-10-24T21:35:00.000Z'),
    recurrenceRule: 'FREQ=YEARLY;BYWEEKNO=51;BYDAY=WE,TH',
  }, {
    text: 'Monthly Planning',
    roomId: [4],
    startDate: new Date('2020-11-24T22:30:00.000Z'),
    endDate: new Date('2020-11-24T23:45:00.000Z'),
    recurrenceRule: 'FREQ=MONTHLY;BYMONTHDAY=28;COUNT=1',
  }, {
    text: 'Open Day',
    roomId: [5],
    startDate: new Date('2020-11-01T17:30:00.000Z'),
    endDate: new Date('2020-11-01T21:00:00.000Z'),
    recurrenceRule: 'FREQ=YEARLY;BYYEARDAY=333',
  },
];
export const resourcesData: Resource[] = [
  {
    text: 'Room 101',
    id: 1,
    color: '#bbd806',
  }, {
    text: 'Room 102',
    id: 2,
    color: '#f34c8a',
  }, {
    text: 'Room 103',
    id: 3,
    color: '#ae7fcc',
  }, {
    text: 'Meeting room',
    id: 4,
    color: '#ff8817',
  }, {
    text: 'Conference hall',
    id: 5,
    color: '#03bb92',
  },
];
    
    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';
const AppointmentMenuTemplate = (props) => (
  <div>
    {props.data.color && (
      <div
        className="item-badge"
        style={{ backgroundColor: props.data.color }}
      />
    )}
    {props.data.text}
  </div>
);
export default AppointmentMenuTemplate;
    
    import React from 'react';
import ReactDOM from 'react-dom';
import App from './App.js';
ReactDOM.render(<App />, document.getElementById('app'));
    
    export const data = [
  {
    text: 'Watercolor Landscape',
    roomId: [1],
    startDate: new Date('2020-11-01T17:30:00.000Z'),
    endDate: new Date('2020-11-01T19:00:00.000Z'),
    recurrenceRule: 'FREQ=WEEKLY;BYDAY=MO,TH;COUNT=10',
  },
  {
    text: 'Oil Painting for Beginners',
    roomId: [2],
    startDate: new Date('2020-11-01T17:30:00.000Z'),
    endDate: new Date('2020-11-01T19:00:00.000Z'),
    recurrenceRule: 'FREQ=WEEKLY;BYDAY=SU,WE;COUNT=10',
  },
  {
    text: 'Testing',
    roomId: [3],
    startDate: new Date('2020-11-01T20:00:00.000Z'),
    endDate: new Date('2020-11-01T21:00:00.000Z'),
    recurrenceRule: 'FREQ=WEEKLY;BYDAY=SU;WKST=TU;INTERVAL=2;COUNT=2',
  },
  {
    text: 'Meeting of Instructors',
    roomId: [4],
    startDate: new Date('2020-11-01T17:00:00.000Z'),
    endDate: new Date('2020-11-01T17:15:00.000Z'),
    recurrenceRule: 'FREQ=DAILY;BYDAY=TU;UNTIL=20201203',
  },
  {
    text: 'Recruiting students',
    roomId: [5],
    startDate: new Date('2020-10-24T18:00:00.000Z'),
    endDate: new Date('2020-10-24T19:00:00.000Z'),
    recurrenceRule: 'FREQ=YEARLY;BYWEEKNO=50;WKST=SU',
    recurrenceException: '20201212T190000Z',
  },
  {
    text: 'Final exams',
    roomId: [3],
    startDate: new Date('2020-10-24T20:00:00.000Z'),
    endDate: new Date('2020-10-24T21:35:00.000Z'),
    recurrenceRule: 'FREQ=YEARLY;BYWEEKNO=51;BYDAY=WE,TH',
  },
  {
    text: 'Monthly Planning',
    roomId: [4],
    startDate: new Date('2020-11-24T22:30:00.000Z'),
    endDate: new Date('2020-11-24T23:45:00.000Z'),
    recurrenceRule: 'FREQ=MONTHLY;BYMONTHDAY=28;COUNT=1',
  },
  {
    text: 'Open Day',
    roomId: [5],
    startDate: new Date('2020-11-01T17:30:00.000Z'),
    endDate: new Date('2020-11-01T21:00:00.000Z'),
    recurrenceRule: 'FREQ=YEARLY;BYYEARDAY=333',
  },
];
export const resourcesData = [
  {
    text: 'Room 101',
    id: 1,
    color: '#bbd806',
  },
  {
    text: 'Room 102',
    id: 2,
    color: '#f34c8a',
  },
  {
    text: 'Room 103',
    id: 3,
    color: '#ae7fcc',
  },
  {
    text: 'Meeting room',
    id: 4,
    color: '#ff8817',
  },
  {
    text: 'Conference hall',
    id: 5,
    color: '#03bb92',
  },
];
    
    <!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" />
    <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 class="demo-container">
      <div id="app"></div>
    </div>
  </body>
</html>
    
    .dx-menu-item-content span {
  margin-right: 5px;
}
.dx-menu-item-has-submenu .dx-icon-spinright {
  position: absolute;
  top: 7px;
  right: 2px;
}
.item-badge {
  text-align: center;
  float: left;
  margin-right: 12px;
  color: white;
  width: 18px;
  height: 18px;
  font-size: 19.5px;
  border-radius: 18px;
  margin-top: 2px;
}