bc518174
 王天杨
提交两个项目文件
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import { ChangeEventHandler } from 'react';
import { isSameYear, setMonth, startOfMonth } from 'date-fns';
import { Dropdown } from 'components/Dropdown';
import { useDayPicker } from 'contexts/DayPicker';
import { MonthChangeEventHandler } from 'types/EventHandlers';
/** The props for the {@link MonthsDropdown} component. */
export interface MonthsDropdownProps {
/** The month where the dropdown is displayed. */
displayMonth: Date;
onChange: MonthChangeEventHandler;
}
/** Render the dropdown to navigate between months. */
export function MonthsDropdown(props: MonthsDropdownProps): JSX.Element {
const {
fromDate,
toDate,
styles,
locale,
formatters: { formatMonthCaption },
classNames,
components,
labels: { labelMonthDropdown }
} = useDayPicker();
// Dropdown should appear only when both from/toDate is set
if (!fromDate) return <></>;
if (!toDate) return <></>;
const dropdownMonths: Date[] = [];
if (isSameYear(fromDate, toDate)) {
// only display the months included in the range
const date = startOfMonth(fromDate);
for (let month = fromDate.getMonth(); month <= toDate.getMonth(); month++) {
dropdownMonths.push(setMonth(date, month));
}
} else {
// display all the 12 months
const date = startOfMonth(new Date()); // Any date should be OK, as we just need the year
for (let month = 0; month <= 11; month++) {
dropdownMonths.push(setMonth(date, month));
}
}
const handleChange: ChangeEventHandler<HTMLSelectElement> = (e) => {
const selectedMonth = Number(e.target.value);
const newMonth = setMonth(startOfMonth(props.displayMonth), selectedMonth);
props.onChange(newMonth);
};
const DropdownComponent = components?.Dropdown ?? Dropdown;
return (
<DropdownComponent
name="months"
aria-label={labelMonthDropdown()}
className={classNames.dropdown_month}
style={styles.dropdown_month}
onChange={handleChange}
value={props.displayMonth.getMonth()}
caption={formatMonthCaption(props.displayMonth, { locale })}
>
{dropdownMonths.map((m) => (
<option key={m.getMonth()} value={m.getMonth()}>
{formatMonthCaption(m, { locale })}
</option>
))}
</DropdownComponent>
);
}
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