implementing-navigation（实施导航）

Navigation Patterns & Routing Implementation

Purpose

This skill provides comprehensive guidance for implementing navigation systems across both frontend and backend applications. It covers client-side navigation patterns (menus, tabs, breadcrumbs) and routing (React Router, Next.js) as well as server-side route configuration (Flask, Django, FastAPI).

When to Use

Use this skill when:

• Building primary navigation (top, side, mega menus)
• Implementing secondary navigation (breadcrumbs, tabs, pagination)
• Setting up client-side routing (React Router, Next.js)
• Configuring server-side routes (Flask, Django, FastAPI)
• Creating mobile navigation patterns (hamburger, bottom nav)
• Implementing keyboard-accessible navigation
• Building command palettes or search-driven navigation
• Creating multi-step wizards or steppers
• Ensuring WCAG 2.1 AA compliance for navigation

Navigation Decision Framework

Information Architecture → Navigation Pattern

Flat (1-2 levels)      → Top Navigation
Deep (3+ levels)       → Side Navigation
E-commerce/Large       → Mega Menu
Linear Process         → Stepper/Wizard
Long Content          → Table of Contents
Power Users           → Command Palette
Multi-section Page    → Tabs
Large Data Sets       → Pagination

Frontend Navigation Components

Primary Navigation Patterns

Top Navigation (Horizontal)

• Best for shallow hierarchies, marketing sites
• 5-7 primary links maximum for cognitive load
• See references/menu-patterns.md for implementation

Side Navigation (Vertical)

• Best for deep hierarchies, admin panels, dashboards
• Supports multi-level nesting and collapsible sections
• See references/menu-patterns.md for sidebar patterns

Mega Menu

• Best for e-commerce, content-heavy sites
• Rich content with images and descriptions
• See references/menu-patterns.md for mega menu structure

Secondary Navigation Components

Breadcrumbs

• Shows hierarchical path and current location
• Essential for deep sites and e-commerce
• See references/navigation-components.md for breadcrumb patterns

Tabs

• Content switching without page reload
• URL synchronization for bookmarking
• See references/navigation-components.md for tab implementation

Pagination

• For search results, product lists, articles
• Consider virtualization for performance
• See references/navigation-components.md for pagination patterns

Client-Side Routing

React Router (Industry Standard)

• Type-safe routing with loader patterns
• Nested routes and lazy loading support
• See references/client-routing.md for React Router patterns

Next.js App Router

• File-based routing with RSC support
• Parallel and intercepting routes
• See references/client-routing.md for Next.js routing

Backend Routing Patterns

Python Web Frameworks

Flask

• Blueprint-based organization
• Route decorators and URL rules
• See references/flask-routing.md for Flask patterns

Django

• URL configuration with namespaces
• Path converters and regex patterns
• See references/django-urls.md for Django URL conf

FastAPI

• Router-based organization
• Path operations and dependencies
• See references/fastapi-routing.md for FastAPI routers

Mobile Navigation

Patterns for Touch Devices

Hamburger Menu

• Slide-out drawer for primary navigation
• See references/menu-patterns.md for mobile drawer

Bottom Navigation

• 3-5 primary actions, thumb-friendly
• See references/menu-patterns.md for bottom nav

Tab Bar

• Horizontal scrollable tabs with swipe
• Natural for mobile-first applications

Accessibility Requirements

Keyboard Navigation

Tab       → Move forward through links
Shift+Tab → Move backward through links
Enter     → Activate link/button
Space     → Activate button
Arrow keys → Navigate within menus
Escape    → Close dropdowns/modals

ARIA Patterns

Essential ARIA attributes for accessible navigation:

• See references/accessibility-navigation.md for complete ARIA patterns
• Includes landmark roles, states, and properties
• Screen reader optimization techniques

Focus Management

• Visible focus indicators (2px minimum, 3:1 contrast)
• Focus trap for modals and dropdowns
• Skip navigation link for keyboard users
• See references/accessibility-navigation.md for focus patterns

Implementation Utilities

Navigation Structure Management

Generate and validate navigation trees:

# Validate navigation structure
node scripts/validate_navigation_tree.js nav-config.json

# Generate breadcrumb trails
node scripts/calculate_breadcrumbs.js current-path

Route Generation (Python)

Generate route configurations:

# Generate Flask/Django/FastAPI routes
python scripts/generate_routes.py --framework flask --config routes.yaml

Code Examples

Frontend Examples

For working navigation implementations:

• examples/horizontal-menu.tsx - Responsive top navigation
• examples/tab-navigation.tsx - Tabs with URL sync
• examples/mobile-navigation.tsx - Hamburger and drawer

Backend Examples

For routing configuration:

• examples/flask_routes.py - Flask blueprint setup
• examples/django_urls.py - Django URL patterns
• examples/fastapi_routes.py - FastAPI router organization

Navigation Configuration

For complex navigation structures, use the configuration schema:

• assets/navigation-config-schema.json - Navigation tree schema
• assets/route-templates.json - Common route patterns

Validate configurations before implementation using the validation script.

Library Recommendations

Frontend Routing

React Router is the recommended solution for React applications:

• Industry standard with excellent TypeScript support
• Built-in accessibility with NavLink active states
• See references/library-comparison.md for alternatives

Component Libraries

For rapid development, consider:

• Headless UI libraries (Radix UI, React Aria)
• Accessible by default
• Work with any styling approach

Progressive Enhancement

Build navigation that works without JavaScript:

• Server-rendered HTML navigation
• Progressive enhancement with client-side routing
• Fallback for JavaScript failures

Performance Considerations

• Lazy load route components
• Prefetch navigation targets
• Use route-based code splitting
• Implement loading states for navigation

Testing Navigation

Essential navigation tests:

• Keyboard navigation flow
• Screen reader announcements
• Mobile touch interactions
• Route parameter validation
• Deep linking functionality

Next Steps

1. Analyze the information architecture
2. Select appropriate navigation pattern
3. Implement with accessibility first
4. Add progressive enhancement
5. Test across devices and assistive technologies

For detailed implementation guides, explore the referenced documentation files based on specific requirements.