React Timeline Employee Shift Slots

Use the renderSlot option for rendering a custom time slot header. Customize how the time slots look and what they show. Utilize properties passed in the slots array.

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Build a Timeline with custom shift slot headers — replace hourly intervals with Morning and Afternoon, each with its own time range and color.

Code

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import { Eventcalendar, formatDate, setOptions  } from '@mobiscroll/react';
import { useCallback, useMemo, useState } from 'react';

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

const staff = [
  {
    id: 1,
    name: 'Ryan',
    color: '#e20000',
    title: 'Cloud System Engineer',
    img: 'https://img.mobiscroll.com/demos/m1.png',
  },
  {
    id: 2,
    name: 'Kate',
    color: '#60e81a',
    title: 'Help Desk Specialist',
    img: 'https://img.mobiscroll.com/demos/f1.png',
  },
  {
    id: 3,
    name: 'John',
    color: '#3ba7ff',
    title: 'Application Developer',
    img: 'https://img.mobiscroll.com/demos/m2.png',
  },
];

const defaultShifts = [
  {
    start: '2026-11-06T07:00',
    end: '2026-11-06T13:00',
    title: '07:00 - 13:00',
    resource: 2,
    slot: 1,
  },
  {
    start: '2026-11-06T07:00',
    end: '2026-11-06T13:00',
    title: '07:00 - 13:00',
    resource: 3,
    slot: 1,
  },
  {
    start: '2026-11-06T07:00',
    end: '2026-11-06T13:00',
    title: '07:00 - 13:00',
    resource: 6,
    slot: 1,
  },
  {
    start: '2026-11-07T07:00',
    end: '2026-11-07T13:00',
    title: '07:00 - 13:00',
    resource: 1,
    slot: 1,
  },
  {
    start: '2026-11-07T07:00',
    end: '2026-11-07T13:00',
    title: '07:00 - 13:00',
    resource: 2,
    slot: 1,
  },
  {
    start: '2026-11-07T12:00',
    end: '2026-11-07T18:00',
    title: '12:00 - 18:00',
    resource: 3,
    slot: 2,
  },
  {
    start: '2026-11-08T07:00',
    end: '2026-11-08T13:00',
    title: '07:00 - 13:00',
    resource: 1,
    slot: 1,
  },
  {
    start: '2026-11-08T07:00',
    end: '2026-11-08T13:00',
    title: '07:00 - 13:00',
    resource: 3,
    slot: 1,
  },
  {
    start: '2026-11-08T12:00',
    end: '2026-11-08T18:00',
    title: '12:00 - 18:00',
    resource: 2,
    slot: 2,
  },
  {
    start: '2026-11-09T12:00',
    end: '2026-11-09T18:00',
    title: '12:00 - 18:00',
    resource: 2,
    slot: 2,
  },
  {
    start: '2026-11-10T07:00',
    end: '2026-11-10T13:00',
    title: '07:00 - 13:00',
    resource: 1,
    slot: 1,
  },
  {
    start: '2026-11-10T12:00',
    end: '2026-11-10T18:00',
    title: '12:00 - 18:00',
    resource: 2,
    slot: 2,
  },
  {
    start: '2026-11-10T12:00',
    end: '2026-11-10T18:00',
    title: '12:00 - 18:00',
    resource: 3,
    slot: 2,
  },
  {
    start: '2026-11-11T07:00',
    end: '2026-11-11T13:00',
    title: '07:00 - 13:00',
    resource: 1,
    slot: 1,
  },
  {
    start: '2026-11-11T12:00',
    end: '2026-11-11T18:00',
    title: '12:00 - 18:00',
    resource: 3,
    slot: 2,
  },
];

const myColors = [
  {
    background: '#a5ceff4d',
    slot: 1,
    recurring: {
      repeat: 'weekly',
      weekDays: 'MO,TU,WE,TH,FR',
    },
  },
  {
    background: '#f7f7bb4d',
    slot: 2,
    recurring: {
      repeat: 'weekly',
      weekDays: 'MO,TU,WE,TH,FR',
    },
  },
];

const mySlots = [
  {
    id: 1,
    name: 'Morning',
  },
  {
    id: 2,
    name: 'Afternoon',
  },
];

function App() {
  const [shifts, setShifts] = useState(defaultShifts);
  const myView = useMemo(
    () => ({
      timeline: {
        type: 'week',
        eventDisplay: 'fill',
        startDay: 1,
        endDay: 5,
      },
    }),
    [],
  );

  const renderMySlot = useCallback((args) => {
    const slotId = args.slot.id;
    return (
      <div style={{ backgroundColor: slotId === 1 ? '#a5ceff4d' : '#f7f7bb4d', padding: '4px' }}>
        <div className="slot-name">{args.slot.name}</div>
        <div className="slot-time">{slotId === 1 ? '7am - 1pm' : '12pm - 6pm'}</div>
      </div>
    );
  }, []);

  const extendMyDefaultEvent = useCallback((ev) => {
    const d = ev.start;
    const start = new Date(d.getFullYear(), d.getMonth(), d.getDate(), ev.slot === 1 ? 7 : 12);
    const end = new Date(d.getFullYear(), d.getMonth(), d.getDate(), ev.slot === 1 ? 13 : 18);

    return {
      title: formatDate('HH:mm', start) + ' - ' + formatDate('HH:mm', end),
      start,
      end,
    };
  }, []);

  const handleEventUpdate = useCallback(
    (args) => {
      const event = args.event;
      const index = shifts.findIndex((x) => x.id === event.id);
      const newShifts = [...shifts];

      newShifts.splice(index, 1, { ...event, title: event.slot === 1 ? '07:00 - 13:00' : '12:00 - 18:00' });
      setShifts(newShifts);
      return false;
    },
    [shifts],
  );

  return (
    <Eventcalendar
      view={myView}
      data={shifts}
      resources={staff}
      colors={myColors}
      slots={mySlots}
      clickToCreate={true}
      dragToMove={true}
      dragToResize={false}
      renderSlot={renderMySlot}
      onEventUpdate={handleEventUpdate}
      extendDefaultEvent={extendMyDefaultEvent}
      cssClass="md-shift-template"
    />
  );
}

export default App;

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