EmailBill/.sisyphus/notepads/date-navigation/learnings.md

Date Navigation Implementation Learnings

Implementation Details

• Added left/right arrow navigation to both StatisticsView.vue and BudgetView.vue
• Used <van-icon name="arrow-left" /> and <van-icon name="arrow" /> for directional arrows
• Text center remains clickable for date picker popup
• Arrows use @click.stop to prevent event propagation

StatisticsView.vue

• navigateDate(direction) method handles both month and year modes
• Month mode: handles year boundaries (Jan -> Dec of previous year, Dec -> Jan of next year)
• Year mode: increments/decrements year directly
• Resets showAllExpense state on navigation

BudgetView.vue

• navigateDate(direction) uses native Date object manipulation
• setMonth() automatically handles month/year boundaries
• Updates selectedDate ref which triggers data fetching via watcher

Styling

• Added .nav-date-picker with flex layout and 12px gap
• .nav-date-text for clickable center text
• .nav-arrow with 8px horizontal padding for touch-friendly targets
• Active state opacity transition for visual feedback
• Arrow font size: 18px for clear visibility

Key Decisions

• Used @click.stop on arrows to prevent opening date picker
• Centered layout preserved (van-nav-bar default behavior)
• Consistent styling across both views
• Touch-friendly padding for mobile UX

Verification

• ESLint: No new errors introduced
• Build: Successful compilation
• Date math: Correctly handles month/year boundaries