Detect state change in composer function

[dulguun0225]

Is it possible to detect state change of a component in composer function?

[arunoda]

Could you give us more information on this?

[dulguun0225]

As of now we can already detect props change inside a composer function, right? I was wondering if there could be same thing for state, but only read only access to component's state.

[macrozone]

React-komposer does not detect props-change, maybe there is a misunderstanding.

Additionally, you never have access from "outside" to a component's state, so that also makes little sense to me. Maybe you can explain what you want to achieve with this 👍

[dulguun0225]

I wanted to shorten this chain "component -> action -> ReactiveDict -> container" into "component -> container".

For example if I wanted to set the ordering

1. container sets action through useDeps
2. component calls action
3. action does the ReactiveDict.set('ordering', 'asc')
4. container reads ReactiveDict.get('ordering')

this could be lot shorter if

1. component does this.setState({ordering : 'asc'})
2. container reads value of that state

I think that it wouldn't be a bad practice unless container gets write access to component's state.

[clayne11]

I'm not following. Why do you need react-komposer if you're simply calling setState? You don't need to use react-komposer at all. Maybe you'd be better off with a library like recompose.

[dulguun0225]

Need it to set parameter to subscription.

[dulguun0225]

I guess people don't get it because I'm asking for what doesn't exist in React. Can higher order component read wrapped component's state?

[macrozone]

No. You can't read a component's state from outside. And that's a good thing.

With stateless components you "know" everything about your component anyway, because you pass everything as property

[dulguun0225]

I thought if it is just a read access it would not be a bad practice