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forwardRef and useimperativehandle

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Javasper answered on June 12, 2022 Popularity 7/10 Helpfulness 1/10

answer forwardRef and useimperativehandle

related react forwardref useImperativeHandle typescript

related forwardRef And UseImperativeHandle

forwardRef and useimperativehandle

Comment

forwardRef: makes this grabbable with useRef
useImperativeHandle: now this ref can use the function.

Popularity 7/10 Helpfulness 1/10 Language javascript

Source: Grepper

Tags: javascript

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Contributed on Oct 11 2022

Javasper

0 Answers Avg Quality 2/10

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react forwardref useImperativeHandle typescript

Comment

type CountdownProps = {}
    
type CountdownHandle = {
  start: () => void,
}
    
const Countdown: React.ForwardRefRenderFunction<CountdownHandle, CountdownProps> = (
  props,
  forwardedRef,
) => {
  React.useImperativeHandle(forwardedRef, ()=>({
    start() {
      alert('Start');
    }
  });

  return <div>Countdown</div>;
}

export default React.forwardRef(Countdown);

/* 
and then use React utility ElementRef, TypeScript
can infer exact ref type of your component
*/
const App: React.FC = () => {
  // this will be inferred as `CountdownHandle`
  type CountdownHandle = React.ElementRef<typeof Countdown>;

  const ref = React.useRef<CountdownHandle>(null); // assign null makes it compatible with elements.

  return (
    <Countdown ref={ref} />
  );
};

Popularity 10/10 Helpfulness 5/10 Language typescript

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Tags: react-forwardref reac

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Contributed on Jun 12 2022

florinrelea

0 Answers Avg Quality 2/10

forwardRef And UseImperativeHandle

Comment

forwardRef is to be able to attach a ref to an instance of this component in its parent.
UseImperativeHandle is for its instance(refs) to be able to use its functions

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Tags: whatever

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Contributed on Oct 10 2022

Javasper

0 Answers Avg Quality 2/10

forwardRef and useimperativehandle

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react forwardref useImperativeHandle typescript

forwardRef And UseImperativeHandle

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