LG-3879: fix(DatePicker) Updates DatePicker Next/Prev button aria-labels

.changeset/date-picker-aria.md

@@ -0,0 +1,7 @@
+---
+'@leafygreen-ui/date-picker': patch
+---
+
+[LG-3879](https://jira.mongodb.org/browse/LG-3879)
+Updates ARIA labels for DatePicker menu previous/next buttons, and year/month select elements.
+Hides calendar cell text, so screen-readers only read the cell's `aria-value`.

packages/date-picker/src/DatePicker/DatePicker.testutils.tsx

@@ -114,12 +114,14 @@ export const renderDatePicker = (
     const calendarGrid = withinElement(menuContainerEl)?.queryByRole('grid');
     const calendarCells =
       withinElement(menuContainerEl)?.getAllByRole('gridcell');
-    const leftChevron =
-      withinElement(menuContainerEl)?.queryByLabelText('Previous month') ||
-      withinElement(menuContainerEl)?.queryByLabelText('Previous valid month');
-    const rightChevron =
-      withinElement(menuContainerEl)?.queryByLabelText('Next month') ||
-      withinElement(menuContainerEl)?.queryByLabelText('Next valid month');
+
+    // TODO: date-picker test harnesses https://jira.mongodb.org/browse/LG-4176
+    const leftChevron = withinElement(menuContainerEl)?.queryByTestId(
+      'lg-date_picker-menu-prev_month_button',
+    );
+    const rightChevron = withinElement(menuContainerEl)?.queryByTestId(
+      'lg-date_picker-menu-next_month_button',
+    );
     const monthSelect = withinElement(menuContainerEl)?.queryByLabelText(
       'Select month',
       {

packages/date-picker/src/DatePicker/DatePickerMenu/DatePickerMenu.spec.tsx

@@ -123,16 +123,32 @@ describe('packages/date-picker/date-picker-menu', () => {
       expect(grid).toHaveAttribute('aria-label', 'September 2023');
     });
     test('chevrons have aria labels', () => {
-      const { getByLabelText } = renderDatePickerMenu();
-      const leftChevron = getByLabelText('Previous month');
-      const rightChevron = getByLabelText('Next month');
+      const { getByTestId } = renderDatePickerMenu();
+      const leftChevron = getByTestId('lg-date_picker-menu-prev_month_button');
+      const rightChevron = getByTestId('lg-date_picker-menu-next_month_button');
       expect(leftChevron).toBeInTheDocument();
       expect(rightChevron).toBeInTheDocument();
+      expect(leftChevron).toHaveAttribute(
+        'aria-label',
+        expect.stringContaining('Previous month'),
+      );
+      expect(rightChevron).toHaveAttribute(
+        'aria-label',
+        expect.stringContaining('Next month'),
+      );
     });
     test('select menu triggers have aria labels', () => {
       const { monthSelect, yearSelect } = renderDatePickerMenu();
       expect(monthSelect).toBeInTheDocument();
       expect(yearSelect).toBeInTheDocument();
+      expect(monthSelect).toHaveAttribute(
+        'aria-label',
+        expect.stringContaining('Select month'),
+      );
+      expect(yearSelect).toHaveAttribute(
+        'aria-label',
+        expect.stringContaining('Select year'),
+      );
     });
     test('select menus have correct values', () => {
       const { monthSelect, yearSelect } = renderDatePickerMenu();

packages/date-picker/src/DatePicker/DatePickerMenu/DatePickerMenuHeader/DatePickerMenuHeader.tsx

@@ -1,9 +1,14 @@
 import React, { forwardRef, MouseEventHandler } from 'react';
 
-import { isSameUTCMonth, setUTCMonth } from '@leafygreen-ui/date-utils';
+import {
+  getMonthName,
+  isSameUTCMonth,
+  setUTCMonth,
+} from '@leafygreen-ui/date-utils';
 import { SupportedLocales } from '@leafygreen-ui/date-utils';
 import { Icon } from '@leafygreen-ui/icon';
 import { IconButton } from '@leafygreen-ui/icon-button';
+import { isDefined } from '@leafygreen-ui/lib';
 
 import { useSharedDatePickerContext } from '../../../shared/context';
 import { useDatePickerContext } from '../../DatePickerContext';
@@ -42,6 +47,12 @@ export const DatePickerMenuHeader = forwardRef<
 
   const isIsoFormat = locale === SupportedLocales.ISO_8601;
 
+  const formatMonth = (date: Date) => {
+    const monthName = getMonthName(date.getUTCMonth(), locale);
+    const year = date.getUTCFullYear().toString();
+    return `${monthName.long} ${year}`;
+  };
+
   /**
    * If the month is not in range and is not the last valid month
    * e.g.
@@ -63,6 +74,48 @@ export const DatePickerMenuHeader = forwardRef<
     return !isDateInRange && !isOnLastValidMonth;
   };
 
+  /**
+   * Given a direction (left/right), computes the nearest valid adjacent month
+   *
+   * @example
+   * max: new Date(Date.UTC(2038, Month.January, 19));
+   * current month date: new Date(Date.UTC(2038, Month.March, 19));
+   * `left` chevron will change the month back to January 2038
+   *
+   * @example
+   * min: new Date(Date.UTC(1970, Month.January, 1));
+   * current month date: new Date(Date.UTC(1969, Month.November, 19));
+   * "right" chevron will change the month back to January 1970
+   */
+  const getNewMonth = (dir: 'left' | 'right'): Date => {
+    if (isMonthInvalid(dir)) {
+      const closestValidDate = dir === 'left' ? max : min;
+      const newMonthIndex = closestValidDate.getUTCMonth();
+      const newMonth = setUTCMonth(closestValidDate, newMonthIndex);
+      return newMonth;
+    } else {
+      const increment = dir === 'left' ? -1 : 1;
+      const newMonthIndex = month.getUTCMonth() + increment;
+      const newMonth = setUTCMonth(month, newMonthIndex);
+      return newMonth;
+    }
+  };
+
+  const getChevronButtonLabel = (dir: 'left' | 'right') => {
+    const dirLabel = dir === 'left' ? 'Previous' : 'Next';
+    const isNewMonthInvalid = isMonthInvalid(dir);
+    const newMonth = getNewMonth(dir);
+    const newMonthString = formatMonth(newMonth);
+    return [
+      dirLabel,
+      isNewMonthInvalid ? 'valid' : undefined,
+      'month',
+      `(${newMonthString})`,
+    ]
+      .filter(isDefined)
+      .join(' ');
+  };
+
   /**
    * Calls the `updateMonth` helper with the appropriate month when a Chevron is clicked
    */
@@ -71,35 +124,16 @@ export const DatePickerMenuHeader = forwardRef<
     e => {
       e.stopPropagation();
       e.preventDefault();
-
-      // e.g.
-      // max: new Date(Date.UTC(2038, Month.January, 19));
-      // current month date: new Date(Date.UTC(2038, Month.March, 19));
-      // left chevron will change the month back to January 2038
-      // e.g.
-      // min: new Date(Date.UTC(1970, Month.January, 1));
-      // current month date: new Date(Date.UTC(1969, Month.November, 19));
-      // right chevron will change the month back to January 1970
-      if (isMonthInvalid(dir)) {
-        const closestValidDate = dir === 'left' ? max : min;
-        const newMonthIndex = closestValidDate.getUTCMonth();
-        const newMonth = setUTCMonth(closestValidDate, newMonthIndex);
-        updateMonth(newMonth);
-      } else {
-        const increment = dir === 'left' ? -1 : 1;
-        const newMonthIndex = month.getUTCMonth() + increment;
-        const newMonth = setUTCMonth(month, newMonthIndex);
-        updateMonth(newMonth);
-      }
+      const newMonth = getNewMonth(dir);
+      updateMonth(newMonth);
     };
 
   return (
     <div ref={fwdRef} className={menuHeaderStyles} {...rest}>
       <IconButton
         ref={refs.chevronButtonRefs.left}
-        aria-label={
-          isMonthInvalid('left') ? 'Previous valid month' : 'Previous month'
-        }
+        data-testid="lg-date_picker-menu-prev_month_button"
+        aria-label={getChevronButtonLabel('left')}
         disabled={shouldChevronBeDisabled('left', month, min)}
         onClick={handleChevronClick('left')}
       >
@@ -120,7 +154,8 @@ export const DatePickerMenuHeader = forwardRef<
       </div>
       <IconButton
         ref={refs.chevronButtonRefs.right}
-        aria-label={isMonthInvalid('right') ? 'Next valid month' : 'Next month'}
+        data-testid="lg-date_picker-menu-next_month_button"
+        aria-label={getChevronButtonLabel('right')}
         disabled={shouldChevronBeDisabled('right', month, max)}
         onClick={handleChevronClick('right')}
       >

packages/date-picker/src/DatePicker/DatePickerMenu/DatePickerMenuSelect/DatePickerMenuSelectMonth.tsx

@@ -1,6 +1,10 @@
 import React, { useCallback } from 'react';
 
-import { getLocaleMonths, setUTCMonth } from '@leafygreen-ui/date-utils';
+import {
+  getLocaleMonths,
+  getMonthName,
+  setUTCMonth,
+} from '@leafygreen-ui/date-utils';
 import { cx } from '@leafygreen-ui/emotion';
 import { Option, Select } from '@leafygreen-ui/select';
 
@@ -40,16 +44,18 @@ export const DatePickerMenuSelectMonth = ({
     updateMonth(newMonth);
   };
 
+  const monthString = getMonthName(month.getUTCMonth(), locale);
+
   return (
     <Select
       {...selectElementProps}
-      aria-label="select month"
+      aria-label={`Select month (${monthString.long} selected)`}
       value={month.getUTCMonth().toString()}
       onChange={handleMonthOnChange}
       className={cx(selectTruncateStyles, selectInputWidthStyles)}
       onEntered={() => setIsSelectOpen(true)}
       onExited={() => setIsSelectOpen(false)}
-      placeholder={monthOptions[month.getUTCMonth()].short}
+      placeholder={monthString.short}
     >
       {monthOptions.map((m, i) => (
         <Option

packages/date-picker/src/DatePicker/DatePickerMenu/DatePickerMenuSelect/DatePickerMenuSelectYear.tsx

@@ -33,16 +33,18 @@ export const DatePickerMenuSelectYear = ({
     updateMonth(newMonth);
   };
 
+  const yearString = month.getUTCFullYear().toString();
+
   return (
     <Select
       {...selectElementProps}
-      aria-label="select year"
-      value={month.getUTCFullYear().toString()}
+      aria-label={`Select year (${yearString} selected)`}
+      value={yearString}
       onChange={handleYearOnChange}
       className={cx(selectTruncateStyles, selectInputWidthStyles)}
       onEntered={() => setIsSelectOpen(true)}
       onExited={() => setIsSelectOpen(false)}
-      placeholder={month.getUTCFullYear().toString()}
+      placeholder={yearString}
     >
       {yearOptions.map(y => (
         <Option value={y.toString()} key={y} aria-label={y.toString()}>

packages/date-picker/src/shared/components/Calendar/CalendarCell/CalendarCell.tsx

@@ -47,6 +47,7 @@ export const CalendarCell = React.forwardRef<
       isHighlighted,
       className,
       onClick,
+      'aria-label': ariaLabel,
       ...rest
     }: CalendarCellProps,
     fwdRef,
@@ -86,6 +87,7 @@ export const CalendarCell = React.forwardRef<
         role="gridcell"
         data-testid="lg-date_picker-calendar_cell"
         data-highlighted={isHighlighted}
+        aria-label={ariaLabel}
         aria-current={isCurrent}
         aria-selected={isActive}
         aria-disabled={state === CalendarCellState.Disabled}
@@ -109,6 +111,7 @@ export const CalendarCell = React.forwardRef<
       >
         <div className={cx(indicatorBaseStyles, indicatorClassName)}></div>
         <span
+          aria-hidden={true} // hidden, since the `td` announces the value via `aria-label`
           className={cx(cellTextStyles, {
             [cellTextCurrentStyles]: isCurrent,
           })}