react-ui-patterns
React UI patterns for loading states, error handling, and async data in components.
- Three core patterns: show loading indicators only when data is absent, always surface errors to users, and disable buttons during async operations to prevent duplicate submissions
- Includes decision trees and component examples for skeleton vs. spinner selection, error state hierarchy (inline, toast, banner, full screen), and empty state requirements for all collections
- Covers form submission workflows, optimistic updates, and progressive content disclosure with practical TypeScript/React code examples
- Provides anti-patterns checklist to avoid common mistakes like stale UI flashes, silently swallowed errors, and uncontrolled button interactions
React UI Patterns
Core Principles
- Never show stale UI - Loading spinners only when actually loading
- Always surface errors - Users must know when something fails
- Optimistic updates - Make the UI feel instant
- Progressive disclosure - Show content as it becomes available
- Graceful degradation - Partial data is better than no data
Loading State Patterns
The Golden Rule
Show loading indicator ONLY when there's no data to display.
// CORRECT - Only show loading when no data exists
const { data, loading, error } = useGetItemsQuery();
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