React hooks: dispatch action from useEffect

问题

My folder structure:

|--App
  |--Components
    |--PageA.js
    |--PageB.js
    |--PageC.js
  |--common-effects
    |--useFetching.js

I am refactoring my code to fetch data from API, using react hooks. I want to dispatch an action from useEffect in useFetching.js that is intercepted by saga middleware. The action should be dispatched only when the components(PageA, PageB, PageC) mount.

I am using redux, react-redux and redux-saga.

PageA.js:

function(props) {
  useFetching(actionParams)
  //....//
}

Similar code for PageB and PageC components.

I have abstracted the reusable code to fetch data in useFetching Custom hook.

useFetching.js

const useFetching = actionArgs => {
  useEffect( () => {
    store.dispatch(action(actionArgs)); // does not work
  })
}

I don't know how to access redux dispatch in useFetching. I tried it with useReducer effect, but the sagas missed the action.

回答1:

You would need to pass either bound action creators or a reference to dispatch to your hook. These would come from a connected component, same as you would normally use React-Redux:

function MyComponent(props) {
    useFetching(props.fetchSomething);

    return <div>Doing some fetching!</div>
}

const mapDispatch = {
    fetchSomething
};

export default connect(null, mapDispatch)(MyComponent);

The hook should then call the bound action creator in the effect, which will dispatch the action accordingly.

Also, note that your current hook will re-run the effect every time the component is re-rendered, rather than just the first time. You'd need to modify the hook like this:

const useFetching = someFetchActionCreator => {
  useEffect( () => {
    someFetchActionCreator();
  }, [])
}

回答2:

Version using react-redux hooks:

You can even cut out the connect function completely by using useDispatch from react-redux:

export default function MyComponent() {
  useFetching(fetchSomething);

  return <div>Doing some fetching!</div>
}

with your custom hook

import { useDispatch } from 'react-redux';

const useFetching = (someFetchActionCreator) => {
  const dispatch = useDispatch();
  useEffect(() => {
    dispatch(someFetchActionCreator());
  }, [])
}

Edit: removed dispatch from custom hook as suggested by @yonga-springfield

Note: React guarantees that dispatch function identity is stable and won’t change on re-renders. This is why it’s safe to omit from the useEffect or useCallback dependency list.

回答3:

This is just to bring some optimization to @Alex Hans' answer.

As per the documentation here. A custom Hook is a JavaScript function whose name starts with ”use” and that may call other Hooks.

With this in mind, we need not send a reference to the dispatch function to the useFetching hook as a parameter but rather, simply not send it and rather simply use it from within the useFetching hook with the appropriate imports.

Here's an excerpt of what I mean.

import { useDispatch } from 'react-redux';

const useFetching = (someFetchActionCreator) => {
    const dispatch = useDispatch()

    useEffect(() => {
    dispatch(someFetchActionCreator());
  }, [])
}

I can't ascertain this example will fit without errors in your codebase in your case but just trying to explain the idea/concept behind this post.

Hope this helps any future comer.

回答4:

useEffect(() => {
   fetchData();
 }, []);

 async function fetchData() {
   try {
     await Auth.currentSession();
     userHasAuthenticated(true);
   } catch (e) {
     if (e !== "No current user") {
       alert(e);
     }
   }
   dispatch(authentication({ type: "SET_AUTHING", payload: false }));
 }

来源：https://stackoverflow.com/questions/54930197/react-hooks-dispatch-action-from-useeffect

标签

javascript

reactjs

redux

redux-saga