React Calendar - Multiple Selection

import React, { useCallback, useRef, useState } from 'react'; import CheckBox from 'devextreme-react/check-box'; import SelectBox from 'devextreme-react/select-box'; import Button from 'devextreme-react/button'; import Calendar, { CalendarTypes } from 'devextreme-react/calendar'; const selectionModes = ['single', 'multiple', 'range']; const selectionModeLabel = { 'aria-label': 'Selection Mode' }; const isWeekend = (date) => { const day = date.getDay(); return day === 0 || day === 6; }; const isDateDisabled = ({ view, date }) => view === 'month' && isWeekend(date); const now = new Date().getTime(); const msInDay = 1000 * 60 * 60 * 24; const initialValue = [now, now + msInDay]; export default function App() { const calendar = useRef(null); const [selectWeekOnClick, setSelectWeekOnClick] = useState(true); const [selectionMode, setSelectionMode] = useState<CalendarTypes.CalendarSelectionMode>('multiple'); const [minDateValue, setMinDateValue] = useState(null); const [maxDateValue, setMaxDateValue] = useState(null); const [weekendDisabled, setWeekendDisabled] = useState(null); const onSelectWeekOnClickChange = useCallback(({ value }) => { setSelectWeekOnClick(value); }, [setSelectWeekOnClick]); const onSelectionModeChange = useCallback(({ value }) => { setSelectionMode(value); }, [setSelectionMode]); const onMinDateChange = useCallback(({ value }) => { setMinDateValue( value ? new Date(new Date().getTime() - 1000 * 60 * 60 * 24 * 3) : null, ); }, [setMinDateValue]); const onMaxDateChange = useCallback(({ value }) => { setMaxDateValue( value ? new Date(new Date().getTime() + 1000 * 60 * 60 * 24 * 3) : null, ); }, [setMaxDateValue]); const onDisableWeekendChange = useCallback(({ value }) => { setWeekendDisabled(value); }, [setWeekendDisabled]); const onClearButtonClick = useCallback(() => { calendar.current.instance().clear(); }, []); return ( <div id="calendar-demo"> <div className="calendar-container"> <Calendar ref={calendar} showWeekNumbers={true} selectWeekOnClick={selectWeekOnClick} selectionMode={selectionMode} min={minDateValue} max={maxDateValue} defaultValue={initialValue} disabledDates={weekendDisabled ? isDateDisabled : null} /> </div> <div className="options"> <div className="caption">Options</div> <div className="option"> <CheckBox defaultValue={true} text="Select week on click" onValueChanged={onSelectWeekOnClickChange} /> </div> <div className="option"> <span>Selection mode</span> <SelectBox dataSource={selectionModes} value={selectionMode} inputAttr={selectionModeLabel} onValueChanged={onSelectionModeChange} /> </div> <div className="option caption"> <span>Date availability</span> </div> <div className="option"> <CheckBox defaultValue={false} text="Set minimum date" onValueChanged={onMinDateChange} /> </div> <div className="option"> <CheckBox defaultValue={false} text="Set maximum date" onValueChanged={onMaxDateChange} /> </div> <div className="option"> <CheckBox defaultValue={false} text="Disable weekends" onValueChanged={onDisableWeekendChange} /> </div> <div className="option"> <Button text="Clear value" onClick={onClearButtonClick} /> </div> </div> </div> ); }