Angular 5集成redux-offline方案咨询及ngrx离线能力疑问

Hey there! Let's break down your questions one by one since you're looking to build an offline-first Angular app without reinventing the wheel:

react-offline is React-specific, but Angular has its own ecosystem tools to achieve the same offline functionality. Here are the most practical approaches:

• Official Angular Service Worker (@angular/service-worker)
  This is the go-to solution for Angular apps. It handles caching static assets by default, and you can extend it for dynamic data (like API responses) using HttpInterceptor to cache GET requests. For offline writes, you'll need a queue system:
  1. When offline, store write operations (POST/PUT/DELETE) in IndexedDB or local storage (IndexedDB is better for larger datasets).
  2. Use Angular's Navigator.onLine or a service worker event to detect when the app comes back online, then process the queue and sync each operation to the backend.
  3. Add status feedback to users (e.g., "Your changes will sync when you're back online") to improve UX.
• Third-party Libraries
  Libraries like ngx-pwa-offline wrap the Angular Service Worker and include pre-built offline queueing logic, so you don't have to code the queue from scratch.

Absolutely! angular-redux/store is just an Angular wrapper around core Redux, so it plays nicely with redux-offline. Here's a quick setup guide:

1. Install the packages: npm install angular-redux/store redux-offline
2. When configuring your Redux store in Angular, include the redux-offline middleware alongside any other middleware you're using (like redux-thunk or redux-saga).
3. Define your offline configuration (queueing behavior, retry logic, sync callbacks) exactly as you would in a vanilla Redux app.
4. Use Angular's @select decorator or the store service to interact with state—your existing angular-redux/store workflow won't change.
   The core Redux functionality remains intact with angular-redux/store, so any Redux-compatible middleware (including redux-offline) works seamlessly.

NGRX does support offline workflows, but it's not as out-of-the-box as redux-offline—you'll need to either build custom logic or use community extensions:

• How to Add Offline Support to NGRX
  • Use @ngrx/effects: When an API call fails due to offline status, dispatch an action that stores the operation in IndexedDB. Then, create an effect that listens for online status changes and processes the queued actions.
  • Use the community library ngrx-offline: This package adds pre-built offline queueing, state persistence, and retry logic to NGRX, reducing the amount of custom code you need to write.
• Key Limitations Compared to Other Solutions
  • No Built-in Queue: Unlike redux-offline which has queueing baked into its middleware, NGRX requires you to implement queue management manually or rely on community tools.
  • Steeper Learning Curve: If you're new to NGRX, adding offline support means learning how to extend effects, manage state persistence, and handle sync logic—this is more complex than using redux-offline with angular-redux/store.
  • Less Opinionated: NGRX gives you full flexibility, but that means you have to make decisions about sync strategies, conflict resolution, and retry policies—whereas redux-offline provides a standardized, opinionated approach that works for most use cases.

内容的提问来源于stack exchange，提问作者Av94