/Javascript/React/React warning can't perform a react state update on an unmounted component

React warning can't perform a react state update on an unmounted component

componentWillUnmount() {
    // fix Warning: Can't perform a React state update on an unmounted component
    this.setState = (state,callback)=>{
        return;
    };
}

Source: stackoverflow.com

Can't perform a React state update on an unmounted component

// custom Hook for automatic abortion on unmount or dependency change
// You might add onFailure for promise errors as well.
function useAsync(asyncFn, onSuccess) {
  useEffect(() => {
    let isActive = true;
    asyncFn().then(data => {
      if (isActive) onSuccess(data)
      else console.log("aborted setState on unmounted component")
    });
    return () => {
      isActive = false;
    };
  }, [asyncFn, onSuccess]);
}

const Child = () => {
  const [state, setState] = useState("loading (4 sec)...");
  useAsync(simulateFetchData, setState);
  return <div>Child: {state}</div>;
};

const Parent = () => {
  const [mounted, setMounted] = useState(true);
  return (
    <div>
      Parent:
      <button onClick={() => setMounted(!mounted)}>
        {mounted ? "Unmount" : "Mount"} Child
      </button>
      {mounted && <Child />}
      <p>
        Unmount Child, while it is still loading. It won't set state later on,
        so no error is triggered.
      </p>
    </div>
  );
};

const simulateFetchData = () => new Promise(
  resolve => setTimeout(() => resolve("data fetched"), 4000));

ReactDOM.render(<Parent />, document.getElementById("root"));

Source: stackoverflow.com

Similar codes

0 vote341 views1 answer
Remove unused dependencies in React Ask Question
Javascript React
0 vote369 views1 answer
Async wait for axios reactjs
Javascript React
0 vote385 views1 answer
Avoid compressing imagepicker react native
Javascript React
32 votes344 views1 answer
React-router react-router-dom
Javascript React
-1 vote341 views4 answers
React tutorial
Javascript React
1 vote405 views1 answer
Reactnavigation 5 hide header
Javascript React
0 vote395 views1 answer
How to show content-type:image/jpg in react
Javascript React
2 votes444 views1 answer
React native open email client
Javascript React
9 votes410 views1 answer
How to create a react app in current folder
Javascript React
1 vote370 views1 answer
React native flatlist pull to refresh
Javascript React