/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 vote330 views2 answers
Assigning ID to view react native
Javascript React
2 votes299 views2 answers
Get value of Autocomplete react
Javascript React
24 votes459 views3 answers
Reactjs sass setup
Javascript React
0 vote302 views1 answer
React date component with word month
Javascript React
7 votes311 views3 answers
React route props
Javascript React
0 vote297 views1 answer
How to make a github api using react
Javascript React
0 vote301 views1 answer
React form input not working
Javascript React
24 votes271 views6 answers
React native navigation
Javascript React
4 votes301 views1 answer
How to creat emmet in react
Javascript React
0 vote292 views1 answer
How to turn of autocomplete in react hook form material ui
Javascript React