javascript - React @reduxtoolkit not re-rendering component when state is updated - Stack Overflow

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Codesandbox: =/src/App.js

Problem: When I update the state of my store the ponents are not re-rendered. In the above example you can see from the console that the data is correctly fetched, but the ponent is not re-rendered and keep rendering just Loading....

Expected behavior: When I update the state, the ponents are re-rendered.

I found a workaround by using useState in the ponent and subscribing to store changes like:

store.subscribe(() => setComponentState(store.getData())

This basically forces a re-render each time the data is updated.

I can mutate state: In the official docs they say that you can mutate the state since it has some magic that allows to do so (), hence that's not the issue.

Anyone has any idea about what's the appropriate way to make it work?

Codesandbox: https://codesandbox.io/s/condescending-wiles-funk0?file=/src/App.js

Problem: When I update the state of my store the ponents are not re-rendered. In the above example you can see from the console that the data is correctly fetched, but the ponent is not re-rendered and keep rendering just Loading....

Expected behavior: When I update the state, the ponents are re-rendered.

I found a workaround by using useState in the ponent and subscribing to store changes like:

store.subscribe(() => setComponentState(store.getData())

This basically forces a re-render each time the data is updated.

I can mutate state: In the official docs they say that you can mutate the state since it has some magic that allows to do so (https://redux-toolkit.js/usage/usage-guide#simplifying-reducers-with-createreducer), hence that's not the issue.

Anyone has any idea about what's the appropriate way to make it work?

• javascript
• reactjs
• react-redux
• redux-toolkit

Share Improve this question Follow edited May 31, 2021 at 19:02 Linda Paiste 42.3k88 gold badges7979 silver badges116116 bronze badges asked Mar 26, 2021 at 0:07 devamatdevamat 2,51388 gold badges3333 silver badges5757 bronze badges

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2 Answers 2

Sorted by: Reset to default 3

From the useStore docs, it states that the hook shouldn't be used in an app because it doesn't cause the ponent to re-render:

// EXAMPLE ONLY! Do not do this in a real app.

// The ponent will not automatically update if the store state changes

Instead, you should be using useSelector instead.

On that note, how you have your codesandbox example would cause an infinite re-render since dispatch(fetchData()); is called every time the redux state is updated. Instead, you'll want to place it within React.useEffect.

For example, using useSelector with useEffect:

Got an answer on Github: https://github./reduxjs/redux-toolkit/issues/942#issuement-807813092

You should not be using the useStore hook. You should be using the useSelector hook, which subscribes to store updates:

• https://redux.js/tutorials/fundamentals/part-5-ui-react#reading-state-from-the-store-with-useselector
• https://redux.js/tutorials/essentials/part-2-app-structure#reading-data-with-useselector
• https://react-redux.js/api/hooks#useselector

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