Cell Hover Summary Tooltip

This demo demonstrates how to surface detailed cell summaries through tooltips when hovering over schedule cells.

Using onCellHoverIn and onCellHoverOut events, each tooltip dynamically displays the total number of events, invalid and colors in the hovered cell.

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Demo

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Show a per-cell summary tooltip in the Scheduler — hover over any schedule cell to display event count, invalid slots, and color ranges.

Code

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

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

function App() {
  const [cellDate, setCellDate] = useState('');
  const [cellEventNr, setCellEventNr] = useState(0);
  const [cellInvalidNr, setCellInvalidNr] = useState(0);
  const [cellColorNr, setCellColorNr] = useState(0);
  const [isTooltipOpen, setTooltipOpen] = useState(false);
  const [tooltipAnchor, setAnchor] = useState('');

  const myEvents = useMemo(
    () => [
      {
        start: '2026-10-21T08:00',
        end: '2026-10-21T11:00',
        title: 'Task 1',
      },
      {
        start: '2026-10-22T14:00',
        end: '2026-10-22T16:00',
        title: 'Task 2',
      },
      {
        start: '2026-10-23T15:00',
        end: '2026-10-23T17:00',
        title: 'Task 3',
      },
      {
        start: '2026-10-23T10:00',
        end: '2026-10-23T12:00',
        title: 'Task 4',
      },
      {
        start: '2026-10-24T08:00',
        end: '2026-10-24T11:00',
        title: 'Task 5',
      },
      {
        start: '2026-10-24T09:00',
        end: '2026-10-24T12:00',
        title: 'Task 6',
      },
      {
        start: '2026-10-24T10:00',
        end: '2026-10-24T12:00',
        title: 'Task 7',
      },
      {
        start: '2026-10-24T10:00',
        end: '2026-10-24T13:00',
        title: 'Task 8',
      },
      {
        start: '2026-10-24T10:00',
        end: '2026-10-24T14:00',
        title: 'Task 9',
      },
      {
        start: '2026-10-24T16:00',
        end: '2026-10-24T18:00',
        title: 'Task 10',
      },
      {
        start: '2026-10-25T13:00',
        end: '2026-10-25T17:00',
        title: 'Task 11',
      },
      {
        start: '2026-10-25T18:00',
        end: '2026-10-25T20:00',
        title: 'Task 12',
      },
      {
        start: '2026-10-26T08:00',
        end: '2026-10-26T12:00',
        title: 'Task 13',
      },
      {
        start: '2026-10-26T15:00',
        end: '2026-10-26T18:00',
        title: 'Task 14',
      },
      {
        start: '2026-10-27T08:00',
        end: '2026-10-27T11:00',
        title: 'Task 15',
      },
      {
        start: '2026-10-27T15:00',
        end: '2026-10-27T17:00',
        title: 'Task 16',
      },
      {
        start: '2026-10-28T09:00',
        end: '2026-10-28T12:00',
        title: 'Task 17',
      },
    ],
    [],
  );

  const myInvalid = useMemo(
    () => [
      {
        start: '2026-10-22T12:00',
        end: '2026-10-22T13:00',
      },
      {
        start: '2026-10-23T08:00',
        end: '2026-10-23T10:00',
      },
      {
        start: '2026-10-24T13:00',
        end: '2026-10-24T15:00',
      },
      {
        start: '2026-10-25T15:00',
        end: '2026-10-25T17:00',
      },
      {
        start: '10:00',
        end: '11:00',
        recurring: {
          repeat: 'weekly',
          weekDays: 'TU,TH,SA,SU',
        },
      },
    ],
    [],
  );

  const myColors = useMemo(
    () => [
      {
        start: '2026-10-23T12:00',
        end: '2026-10-23T14:00',
        cssClass: 'mds-cell-summary-color',
      },
      {
        start: '2026-10-24T10:00',
        end: '2026-10-24T12:00',
        cssClass: 'mds-cell-summary-color',
      },
      {
        start: '2026-10-25T08:00',
        end: '2026-10-25T11:00',
        cssClass: 'mds-cell-summary-color',
      },
      {
        start: '2026-10-26T14:00',
        end: '2026-10-26T17:00',
        cssClass: 'mds-cell-summary-color',
      },
      {
        start: '08:00',
        end: '09:00',
        cssClass: 'mds-cell-summary-color',
        recurring: {
          repeat: 'weekly',
          weekDays: 'MO,FR',
        },
      },
      {
        start: '14:00',
        end: '16:00',
        cssClass: 'mds-cell-summary-color',
        recurring: {
          repeat: 'weekly',
          weekDays: 'TU,TH',
        },
      },
      {
        start: '10:00',
        end: '12:00',
        recurring: {
          repeat: 'weekly',
          weekDays: 'FR',
        },
        cssClass: 'mds-cell-summary-color',
      },
      {
        start: '16:00',
        end: '17:00',
        recurring: {
          repeat: 'weekly',
          weekDays: 'SU,SA',
        },
        cssClass: 'mds-cell-summary-color',
      },
    ],
    [],
  );

  const myView = useMemo(
    () => ({
      scheduler: {
        type: 'week',
        startTime: '08:00',
        endTime: '18:00',
        timeCellStep: 30,
      },
    }),
    [],
  );

  const handleCellHoverIn = (args) => {
    const endDate = new Date(args.date);
    endDate.setHours(endDate.getHours() + 1);
    const date = formatDate('DDDD MMM D, YYYY, HA - ', args.date);
    const time = formatDate('HA', endDate);

    setCellDate(date + time);
    setCellEventNr(args.events ? args.events.length : 0);
    setCellInvalidNr(args.invalids ? args.invalids.length : 0);
    setCellColorNr(args.colors ? args.colors.length : 0);

    setAnchor(args.target);
    setTooltipOpen(true);
  };

  const handleCellHoverOut = () => {
    setTooltipOpen(false);
  };

  const handleTooltipClose = useCallback(() => {
    setTooltipOpen(false);
  }, []);

  return (
    <>
      <Eventcalendar
        className="mds-cell-summary-on-hover"
        data={myEvents}
        view={myView}
        invalid={myInvalid}
        colors={myColors}
        onCellHoverIn={handleCellHoverIn}
        onCellHoverOut={handleCellHoverOut}
      />
      <Popup
        display="anchored"
        anchor={tooltipAnchor}
        showOverlay={false}
        touchUi={false}
        scrollLock={false}
        isOpen={isTooltipOpen}
        onClose={handleTooltipClose}
      >
        <div className="mds-cell-summary-title">{cellDate}</div>
        <div className="mbsc-flex">
          <div className="mbsc-flex-1-0 mds-cell-summary-item">
            <div className="mbsc-txt-muted">Events</div>
            <div className="mds-cell-summary-content">{cellEventNr}</div>
          </div>
          <div className="mbsc-flex-1-0 mds-cell-summary-item">
            <div className="mbsc-txt-muted">Invalid</div>
            <div className="mds-cell-summary-content">{cellInvalidNr}</div>
          </div>
          <div className="mbsc-flex-1-0 mds-cell-summary-item">
            <div className="mbsc-txt-muted">Colors</div>
            <div className="mds-cell-summary-content">{cellColorNr}</div>
          </div>
        </div>
      </Popup>
    </>
  );
}

export default App;

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