Fix backspace to shift focus to previous element in useDateSegment

packages/@react-aria/datepicker/src/useDateSegment.ts

@@ -93,9 +93,13 @@ export function useDateSegment(segment: DateSegment, state: DateFieldState, ref:
   let parser = useMemo(() => new NumberParser(locale, {maximumFractionDigits: 0}), [locale]);
 
   let backspace = () => {
+    if (segment.text === segment.placeholder) {
+      focusManager.focusPrevious();
+    }
     if (parser.isValidPartialNumber(segment.text) && !state.isReadOnly && !segment.isPlaceholder) {
       let newValue = segment.text.slice(0, -1);
       let parsed = parser.parse(newValue);
+      newValue = parsed === 0 ? '' : newValue;
       if (newValue.length === 0 || parsed === 0) {
         state.clearSegment(segment.type);
       } else {

packages/react-aria-components/stories/DateField.stories.tsx

@@ -12,6 +12,7 @@
 
 import clsx from 'clsx';
 import {DateField, DateInput, DateSegment, Label} from 'react-aria-components';
+import {parseAbsoluteToLocal} from '@internationalized/date';
 import React from 'react';
 import styles from '../example/index.css';
 
@@ -20,7 +21,7 @@ export default {
 };
 
 export const DateFieldExample = () => (
-  <DateField data-testid="date-field-example">
+  <DateField data-testid="date-field-example" defaultValue={parseAbsoluteToLocal('2024-01-01T01:01:00Z')}>
     <Label style={{display: 'block'}}>Date</Label>
     <DateInput className={styles.field} data-testid2="date-input">
       {segment => <DateSegment segment={segment} className={clsx(styles.segment, {[styles.placeholder]: segment.isPlaceholder})} />}

packages/react-aria-components/test/DateField.test.js

@@ -258,4 +258,35 @@ describe('DateField', () => {
     expect(getDescription()).not.toContain('Constraints not satisfied');
     expect(group).not.toHaveAttribute('data-invalid');
   });
+
+  it('should focus previous segment when backspacing on an empty date segment', async () => {
+    let {getAllByRole} = render(
+      <DateField defaultValue={new CalendarDate(2024, 12, 31)}>
+        <Label>Birth date</Label>
+        <DateInput>
+          {segment => <DateSegment segment={segment} />}
+        </DateInput>
+      </DateField>
+    );
+
+    let segments = getAllByRole('spinbutton');
+    await user.click(segments[2]);
+    expect(document.activeElement).toBe(segments[2]);
+
+    // Press backspace to delete '2024'
+    for (let i = 0; i < 4; i++) {
+      await user.keyboard('{backspace}');
+    }
+    expect(document.activeElement).toBe(segments[2]);
+    await user.keyboard('{backspace}');
+    expect(document.activeElement).toBe(segments[1]);
+
+    // Press backspace to delete '31'
+    for (let i = 0; i < 2; i++) {
+      await user.keyboard('{backspace}');
+    }
+    expect(document.activeElement).toBe(segments[1]);
+    await user.keyboard('{backspace}');
+    expect(document.activeElement).toBe(segments[0]);
+  });
 });