Resource Drag-and-Drop Reorder

Resources can be reordered directly through the UI by enabling resourceReorder: true under the timeline settings of the view option. When enabled, a drag handle icon will appear next to each resource, allowing users to drag and reorder resources.

When a resource is dropped into a new position, the onResourceOrderUpdate lifecycle event is triggered. To prevent the resource order from being updated, return false in the handler function of this event.

Use the immutableData option to ensure the original data remains unchanged when validating resource positions after a drop.

Get started with this example

Demo

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Reorder resources on a Timeline by drag and drop — each row shows a drag handle, and an update callback runs on drop.

Code

View code on GitHub 
import {
  Button,
  CalendarNav,
  CalendarNext,
  CalendarPrev,
  CalendarToday,
  Eventcalendar,
  setOptions,
  Toast ,
} from '@mobiscroll/react';
import { useCallback, useState } from 'react';

setOptions({
  locale:  ,
  theme: ' ',
  themeVariant: ' '
});

const resources = [
  { id: 1, name: 'Resource 1' },
  { id: 2, name: 'Resource 2 (Reorder disabled)', reorder: false },
  { id: 3, name: 'Resource 3' },
  { id: 4, name: 'Resource 4 (Reorder disabled)', reorder: false },
  {
    id: 5,
    name: 'Group 1',
    children: [
      { id: 6, name: 'Resource 5' },
      { id: 7, name: 'Resource 6' },
      { id: 8, name: 'Resource 7' },
    ],
  },
  { id: 9, name: 'Resource 8' },
  { id: 10, name: 'Resource 9' },
  {
    id: 11,
    name: 'Group 2',
    children: [
      { id: 12, name: 'Resource 10' },
      { id: 13, name: 'Resource 11' },
      { id: 14, name: 'Resource 12' },
    ],
  },
  { id: 15, name: 'Resource 13' },
  { id: 16, name: 'Resource 14' },
  {
    id: 17,
    name: 'Group 3',
    children: [
      { id: 18, name: 'Resource 15' },
      { id: 19, name: 'Resource 16' },
      { id: 20, name: 'Resource 17' },
    ],
  },
  { id: 21, name: 'Resource 18' },
  {
    id: 22,
    name: 'Group 4',
    children: [
      { id: 23, name: 'Resource 19' },
      { id: 24, name: 'Resource 20' },
      { id: 25, name: 'Resource 21' },
    ],
  },
  { id: 26, name: 'Resource 22' },
];

const events = [
  { id: 1, title: 'Event 1', start: '2026-10-01T00:00', end: '2026-10-05T00:00', resource: 14, color: 'green' },
  { id: 2, title: 'Event 2', start: '2026-10-03T00:00', end: '2026-10-07T00:00', resource: 2, color: 'blue' },
  { id: 3, title: 'Event 3', start: '2026-10-05T00:00', end: '2026-10-10T00:00', resource: 10, color: 'red' },
  { id: 4, title: 'Event 4', start: '2026-10-07T00:00', end: '2026-10-11T00:00', resource: 9, color: 'yellow' },
  { id: 5, title: 'Event 5', start: '2026-10-09T00:00', end: '2026-10-12T00:00', resource: 6, color: 'purple' },
];

const defaultView = {
  timeline: {
    type: 'month',
    resourceReorder: false,
  },
};

function App() {
  const [isReorder, setReorder] = useState(false);
  const [isToastOpen, setToastOpen] = useState(false);
  const [myEvents, setEvents] = useState(events);
  const [myResources, setResources] = useState(resources);
  const [tempResources, setTempResources] = useState([...resources]);
  const [message, setMessage] = useState('');
  const [myView, setMyView] = useState(defaultView);

  const enableReorder = useCallback(() => {
    setReorder(true);
    setMyView({ timeline: { type: 'month', resourceReorder: true } });
  }, []);

  const onToastClose = useCallback(() => {
    setToastOpen(false);
  }, []);

  const saveReorder = useCallback(() => {
    setReorder(false);
    setMyView({ timeline: { type: 'month', resourceReorder: false } });
    setResources([...tempResources]);
  }, [tempResources]);

  const cancelReorder = useCallback(() => {
    setReorder(false);
    setResources([...myResources]);
    setMyView({ timeline: { type: 'month', resourceReorder: false } });
    setMessage('Resource order canceled');
    setToastOpen(true);
  }, [myResources]);

  const handleResourceOrder = useCallback((args) => {
    setTempResources(args.resources);
  }, []);

  const handleEventUpdate = useCallback(
    (args) => {
      const newEvent = args.event;
      const eventIndex = myEvents.findIndex((e) => e.id === newEvent.id);
      const newEventList = [...myEvents];
      newEventList.splice(eventIndex, 1, newEvent);
      setEvents(newEventList);
    },
    [myEvents],
  );

  const handleEventCreate = useCallback(
    (args) => {
      setEvents([...myEvents, args.event]);
    },
    [myEvents],
  );

  const handleEventDelete = useCallback(
    (args) => {
      setEvents(myEvents.filter((item) => item.id !== args.event.id));
    },
    [myEvents],
  );

  const customHeader = useCallback(
    () => (
      <>
        <CalendarNav />
        <div className="mds-reorder-header-filter mbsc-flex mbsc-flex-1-1">
          {!isReorder && (
            <Button className="mds-reorder-switch mds-enable" variant="flat" onClick={enableReorder}>
              Reorder resources
            </Button>
          )}
          {isReorder && (
            <>
              <Button className="mds-reorder-save mds-update" onClick={saveReorder}>
                Save
              </Button>
              <Button className="mds-reorder-cancel mds-update " onClick={cancelReorder}>
                Cancel
              </Button>
            </>
          )}
          <div className="mds-reorder-header-filter-separator" />
        </div>
        <CalendarPrev />
        <CalendarToday />
        <CalendarNext />
      </>
    ),
    [enableReorder, isReorder, cancelReorder, saveReorder],
  );

  return (
    <>
      <Eventcalendar
        resources={myResources}
        immutableData={true}
        view={myView}
        data={myEvents}
        renderHeader={customHeader}
        onResourceOrderUpdate={handleResourceOrder}
        onEventCreate={handleEventCreate}
        onEventDelete={handleEventDelete}
        onEventUpdate={handleEventUpdate}
      />
      <Toast isOpen={isToastOpen} message={message} onClose={onToastClose} />
    </>
  );
}

export default App;

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