Passing Data with Subjects and Proxies

Question

Is it possible to have a 2 way data flow using Subjects in a service? Suppose for example that I want some component to retrieve information and then post it through the ser

Answer 1

Thats totally possible:

1. Figure out what type of subject you need, normal subject, Behaviour Subject or Replay subject. Each has its own use case, I'd recommend taking a look at this question for a clear and concise explanation: Angular 2 special Observables (Subject / Behaviour subject / ReplaySubject).

2. Declare your subject in a service.

3. Call a next() value in your main component which your second component will listen to.

4. You can then subscribe to that subject from your secondary component and modify it.

5. From here you can either call the next() value on the same subject using the modified data or create a separate subject in your service and use that to pass your modified data into. Either case you can subscribe in your main component to get that data. I'd recommend the later option though as I'm assuming if you modify the data you'll change the object and it's good to strictly type your subjects to catch errors.

Hope this helps.