React Timeline Dual Synchronized Flight Scheduling

For creating complex dashboards like for managing jet bookings sometimes two separate timeline instances are necessary.

Sticking two instances together with synchronized horizontal scrolling allows for a setup where the top timeline is a list of bookings with one flight per rows and the bottom timeline holds available aircrafts.

Only moving events from the top timeline is allowed and events are fixed in time, meaning the start and end cannot be changed. Things like eventOverlap is set to false to avoid overlapping events.

Get started with this example

Demo

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Use synchronized Timeline views to build a flight scheduling UI — drag flights to assign them to aircraft, with fixed event times and conflict detection.

Code

View code on GitHub 
import { Eventcalendar, setOptions, Toast  } from '@mobiscroll/react';
import { useCallback, useMemo, useRef, useState } from 'react';

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

const bookings = [
  {
    start: '2026-11-04T06:00',
    end: '2026-11-04T10:00',
    title: 'Budapest - Ljubljana',
    resource: 1,
  },
  {
    start: '2026-11-04T15:00',
    end: '2026-11-04T18:00',
    title: 'Ljubljana - Berlin',
    resource: 1,
  },
  {
    start: '2026-11-04T04:00',
    end: '2026-11-04T12:00',
    title: 'Los Angeles - Dublin',
    resource: 2,
  },
  {
    start: '2026-11-04T18:00',
    end: '2026-11-04T23:00',
    title: 'Dublin - Bucharest',
    resource: 2,
  },
  {
    start: '2026-11-04T06:00',
    end: '2026-11-04T14:00',
    title: 'Chicago - Amsterdam',
    resource: 3,
  },
  {
    start: '2026-11-04T17:00',
    end: '2026-11-04T22:00',
    title: 'Amsterdam - Cairo',
    resource: 3,
  },
  {
    start: '2026-11-04T10:00',
    end: '2026-11-04T14:00',
    title: 'Hong Kong - Sydney',
    resource: 4,
  },
  {
    start: '2026-11-04T15:00',
    end: '2026-11-04T21:00',
    title: 'Sydney - Tokyo',
    resource: 4,
  },
  {
    start: '2026-11-04T04:00',
    end: '2026-11-04T12:00',
    title: 'Paris - Washington, D.C.',
    resource: 5,
  },
  {
    start: '2026-11-04T12:00',
    end: '2026-11-04T18:00',
    title: 'Washington, D.C. - Los-Angeles',
    resource: 5,
  },
  {
    start: '2026-11-04T03:00',
    end: '2026-11-04T11:00',
    title: 'Los Angeles - Dublin',
    resource: 6,
  },
  {
    start: '2026-11-04T13:00',
    end: '2026-11-04T18:00',
    title: 'Dublin - Rome',
    resource: 6,
  },
  {
    start: '2026-11-04T05:00',
    end: '2026-11-04T12:00',
    title: 'Barcelona - Dubai',
    resource: 7,
  },
  {
    start: '2026-11-04T13:00',
    end: '2026-11-04T20:00',
    title: 'Dubai - Tokyo',
    resource: 7,
  },
  {
    start: '2026-11-04T03:30',
    end: '2026-11-04T13:00',
    title: 'Rome - Toronto',
    resource: 8,
  },
  {
    start: '2026-11-04T16:00',
    end: '2026-11-04T19:00',
    title: 'Toronto - New-York',
    resource: 8,
  },
  {
    start: '2026-11-04T03:00',
    end: '2026-11-04T14:00',
    title: 'Vienna - Shanghai',
    resource: 9,
  },
  {
    start: '2026-11-04T16:00',
    end: '2026-11-04T23:30',
    title: 'Shanghai - Moscow',
    resource: 9,
  },
  {
    start: '2026-11-04T08:00',
    end: '2026-11-04T13:00',
    title: 'London - Cairo',
    resource: 10,
  },
  {
    start: '2026-11-04T15:30',
    end: '2026-11-04T19:30',
    title: 'Cairo - Sofia',
    resource: 10,
  },
  {
    start: '2026-11-04T02:00',
    end: '2026-11-04T13:00',
    title: 'Istanbul - New York',
    resource: 11,
  },
  {
    start: '2026-11-04T16:00',
    end: '2026-11-04T20:00',
    title: 'New York - Montreal',
    resource: 11,
  },
  {
    start: '2026-11-04T05:00',
    end: '2026-11-04T11:00',
    title: 'Seattle - Miami',
    resource: 12,
  },
  {
    start: '2026-11-04T12:00',
    end: '2026-11-04T21:00',
    title: 'Miami - Buenos-Aires',
    resource: 12,
  },
  {
    start: '2026-11-05T04:00',
    end: '2026-11-05T16:00',
    title: 'Hong Kong - Sydney',
    resource: 1,
  },
  {
    start: '2026-11-05T06:00',
    end: '2026-11-05T10:00',
    title: 'Los Angeles - Dublin',
    resource: 2,
  },
  {
    start: '2026-11-05T03:00',
    end: '2026-11-05T11:00',
    title: 'Budapest - Ljubljana',
    resource: 4,
  },
  {
    start: '2026-11-05T05:00',
    end: '2026-11-05T12:00',
    title: 'Los Angeles - Dublin',
    resource: 6,
  },
  {
    start: '2026-11-05T13:00',
    end: '2026-11-05T23:00',
    title: 'London - Cairo',
    resource: 7,
  },
  {
    start: '2026-11-05T03:00',
    end: '2026-11-05T14:00',
    title: 'Miami - Buenos-Aires',
    resource: 9,
  },
  {
    start: '2026-11-05T06:00',
    end: '2026-11-05T12:00',
    title: 'Barcelona - Dubai',
    resource: 10,
  },
  {
    start: '2026-11-05T08:00',
    end: '2026-11-05T22:00',
    title: 'Istanbul - New York',
    resource: 11,
  },
  {
    start: '2026-11-05T05:00',
    end: '2026-11-05T11:00',
    title: 'Vienna - Shanghai',
    resource: 12,
  },
];

const jets = [
  {
    id: 'Op 1',
    name: 'Prestige Air',
    eventCreation: false,
    children: [
      {
        id: 1,
        code: '#AF 7703',
        crew: 52,
        name: 'Red Bolt',
        color: '#1dab2f',
        img: 'https://img.mobiscroll.com/demos/jet-1.jpg',
      },
      {
        id: 2,
        code: '#BQ 4718',
        crew: 47,
        name: 'Skyroar',
        color: '#1dab2f',
        img: 'https://img.mobiscroll.com/demos/jet-2.jpg',
      },
      {
        id: 3,
        code: '#ZM 8430',
        crew: 24,
        name: 'Agile Raven',
        color: '#1dab2f',
        img: 'https://img.mobiscroll.com/demos/jet-3.jpg',
      },
    ],
  },
  {
    id: 'Op 2',
    name: 'Elite Wings',
    eventCreation: false,
    children: [
      {
        id: 4,
        code: '#XG 5500',
        crew: 43,
        name: 'Monsterbolt',
        color: '#1dab2f',
        img: 'https://img.mobiscroll.com/demos/jet-4.jpg',
      },
      {
        id: 5,
        code: '#FL 2531',
        crew: 22,
        name: 'Airrise',
        color: '#1dab2f',
        img: 'https://img.mobiscroll.com/demos/jet-5.jpg',
      },
      {
        id: 6,
        code: '#PA 6487',
        crew: 84,
        name: 'Starblast',
        color: '#1dab2f',
        img: 'https://img.mobiscroll.com/demos/jet-6.jpg',
      },
      {
        id: 7,
        code: '#PP 9812',
        crew: 28,
        name: 'Ebonfire',
        color: '#1dab2f',
        img: 'https://img.mobiscroll.com/demos/jet-7.jpg',
      },
    ],
  },
  {
    id: 'Op 3',
    name: 'Luxury Skies',
    eventCreation: false,
    children: [
      {
        id: 8,
        code: '#DN 3191',
        crew: 36,
        name: 'Dark Bee',
        color: '#1dab2f',
        img: 'https://img.mobiscroll.com/demos/jet-8.jpg',
      },
      {
        id: 9,
        code: '#ZW 2328',
        crew: 76,
        name: 'Keen Sparrow',
        color: '#1dab2f',
        img: 'https://img.mobiscroll.com/demos/jet-9.jpg',
      },
      {
        id: 10,
        code: '#RX 9898',
        crew: 37,
        name: 'Jagged Bolt',
        color: '#1dab2f',
        img: 'https://img.mobiscroll.com/demos/jet-10.jpg',
      },
    ],
  },
];

function App() {
  const reservations = useMemo(
    () => [
      {
        id: 1,
        name: 'Alison Reyes',
      },
      {
        id: 2,
        name: 'Shauna Perry',
      },
      {
        id: 3,
        name: 'Jan Whitney',
      },
      {
        id: 4,
        name: 'Freddie Durham',
      },
      {
        id: 5,
        name: 'William Dillon',
      },
      {
        id: 6,
        name: 'Tyrell Edwards',
      },
      {
        id: 7,
        name: 'Caitlyn Riddle',
      },
      {
        id: 8,
        name: 'Liam Mays',
      },
      {
        id: 9,
        name: 'Frank Medina',
      },
      {
        id: 10,
        name: 'Calvin Larsen',
      },
      {
        id: 11,
        name: 'Heather Walsh',
      },
      {
        id: 12,
        name: 'Conner Paul',
      },
    ],
    [],
  );

  const [flights, setFlights] = useState([
    {
      start: '2026-11-04T10:00',
      end: '2026-11-04T17:00',
      title: 'Barcelona - Dubai',
      resource: 4,
    },
    {
      start: '2026-11-04T07:30',
      end: '2026-11-04T16:00',
      title: 'Toronto - Rome',
      resource: 8,
    },
    {
      start: '2026-11-04T04:00',
      end: '2026-11-04T08:00',
      title: 'Ljubljana - Budapest',
      resource: 1,
    },
    {
      start: '2026-11-04T02:00',
      end: '2026-11-04T10:00',
      title: 'Paris - Washington, D.C.',
      resource: 2,
    },
    {
      start: '2026-11-04T12:00',
      end: '2026-11-04T23:00',
      title: 'New York - Istanbul',
      resource: 7,
    },
    {
      start: '2026-11-04T15:00',
      end: '2026-11-04T23:00',
      title: 'Moscow - Tokyo',
      resource: 3,
    },
  ]);

  const [invalid, setInvalid] = useState();
  const firstCalCont = useRef(null);
  const secondCalCont = useRef(null);
  const skipScroll1 = useRef(false);
  const skipScroll2 = useRef(false);
  const [mySelectedDate, setSelectedDate] = useState(new Date());
  const [isToastOpen, setToastOpen] = useState(false);
  const [toastText, setToastText] = useState();

  const myView = useMemo(
    () => ({
      timeline: {
        type: 'day',
        size: 1,
      },
    }),
    [],
  );

  const renderMyResource = useCallback((resource) => {
    if (!resource.children) {
      return (
        <div className="mbsc-flex mbsc-align-items-center mbsc-justify-content-start">
          <img className="md-drag-drop-bw-inst-avatar" src={resource.img} alt="Avatar" />
          <div className="md-drag-drop-bw-inst-details mbsc-flex-col mbsc-flex-1-0">
            <div>{resource.name}</div>
            <div className="md-aircraft-code mbsc-flex mbsc-justify-content-between">
              <div>{resource.code}</div>
              <div>
                {'\u{1F9D1}\u{1F3FC}\u{200D}\u{2708}\u{FE0F}'} {resource.crew}
              </div>
            </div>
          </div>
        </div>
      );
    }
    return <div>{resource.name}</div>;
  }, []);

  const handleScroll1 = useCallback((ev) => {
    if (secondCalCont.current && !skipScroll2.current) {
      skipScroll1.current = true;
      secondCalCont.current.scrollLeft = ev.target.scrollLeft;
    }
    skipScroll1.current = false;
  }, []);

  const handleScroll2 = useCallback((ev) => {
    if (firstCalCont.current && !skipScroll1.current) {
      skipScroll2.current = true;
      firstCalCont.current.scrollLeft = ev.target.scrollLeft;
    }
    skipScroll2.current = false;
  }, []);

  const handleFirstScroll = useCallback(() => {
    if (!firstCalCont.current) {
      firstCalCont.current = document.querySelector('.md-drag-drop-bw-inst-first .mbsc-timeline-grid-scroll');
      firstCalCont.current.addEventListener('scroll', handleScroll1);
    }
  }, [handleScroll1]);

  const handleSecondScroll = useCallback(() => {
    if (!secondCalCont.current) {
      secondCalCont.current = document.querySelector('.md-drag-drop-bw-inst-second .mbsc-timeline-grid-scroll');
      secondCalCont.current.addEventListener('scroll', handleScroll2);
    }
  }, [handleScroll2]);

  const detachFirstScroll = useCallback(() => {
    if (firstCalCont.current) {
      firstCalCont.current.removeEventListener('scroll', handleScroll1);
    }
  }, [handleScroll1]);

  const detachSecondScroll = useCallback(() => {
    if (secondCalCont.current) {
      secondCalCont.current.removeEventListener('scroll', handleScroll2);
    }
  }, [handleScroll2]);

  const handlePageLoading = useCallback((args) => {
    if (secondCalCont.current) {
      setTimeout(() => {
        setSelectedDate(args.firstDay);
      }, 100);
    }
  }, []);

  const handleSelectedDateChange = useCallback((args) => {
    setSelectedDate(args.date);
  }, []);

  const handleEventCreated = useCallback((args) => {
    setFlights((current) => [...current, args.event]);
    setToastText('Flight scheduled');
    setToastOpen(true);
  }, []);

  const handleEventDeleted = useCallback((args) => {
    setFlights((current) => [...current.filter((flight) => flight.id !== args.event.id)]);
  }, []);

  const handleEventCreateUpdateFailed = useCallback(() => {
    setToastText("There's already a flight on this date");
    setToastOpen(true);
  }, []);

  const handleEventDragStart = useCallback(
    (args) => {
      const unavailable = {};
      const invalid = {
        cssClass: 'md-drag-drop-invalid',
        recurring: { repeat: 'daily' },
        resource: [],
      };
      // Filter unavailable jets
      flights.forEach((flight) => {
        if (
          flight.id !== args.event.id &&
          new Date(flight.start) < new Date(args.event.end) &&
          new Date(flight.end) > new Date(args.event.start)
        ) {
          unavailable[flight.resource] = true;
        }
      });
      flights.forEach((flight) => {
        if (unavailable[flight.resource]) {
          flight.cssClass = 'md-drag-drop-faded';
        }
      });
      jets.forEach((group) => {
        group.children.forEach((jet) => {
          if (unavailable[jet.id]) {
            invalid.resource.push(jet.id);
          }
        });
      });
      setInvalid([invalid]);
    },
    [flights],
  );

  const handleEventDragEnd = useCallback(() => {
    flights.forEach((flight) => {
      delete flight.cssClass;
    });
    setInvalid([]);
  }, [flights]);

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

  return (
    <div className="mbsc-flex-col md-drag-drop-bw-inst-cont">
      <Eventcalendar
        className="md-drag-drop-bw-inst-first"
        data={bookings}
        resources={reservations}
        view={myView}
        dragToMove={false}
        dragToCreate={false}
        dragToResize={false}
        eventDelete={true}
        externalDrag={true}
        onPageLoading={handlePageLoading}
        onPageLoaded={handleFirstScroll}
        onDestroy={detachFirstScroll}
      />
      <Eventcalendar
        className="md-drag-drop-bw-inst-second"
        invalid={invalid}
        data={flights}
        resources={jets}
        view={myView}
        showControls={false}
        dragToCreate={false}
        dragToMove={true}
        dragToResize={false}
        dragInTime={false}
        externalDrop={true}
        eventDelete={true}
        eventOverlap={false}
        renderResource={renderMyResource}
        selectedDate={mySelectedDate}
        onSelectedDateChange={handleSelectedDateChange}
        onEventCreated={handleEventCreated}
        onEventCreateFailed={handleEventCreateUpdateFailed}
        onEventDeleted={handleEventDeleted}
        onEventUpdateFailed={handleEventCreateUpdateFailed}
        onEventDragStart={handleEventDragStart}
        onEventDragEnd={handleEventDragEnd}
        onPageLoaded={handleSecondScroll}
        onDestroy={detachSecondScroll}
      />
      <Toast display="center" message={toastText} isOpen={isToastOpen} onClose={handleCloseToast} />
    </div>
  );
}

export default App;

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