"use ref call parent component to child react" Code Answer's

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use ref call parent component to child react

Xenophobic Xenomorph on Mar 09, 2021

const { forwardRef, useRef, useImperativeHandle } = React;

// We need to wrap component in `forwardRef` in order to gain
// access to the ref object that is assigned using the `ref` prop.
// This ref is passed as the second parameter to the function component.
const Child = forwardRef((props, ref) => {

  // The component instance will be extended
  // with whatever you return from the callback passed
  // as the second argument
  useImperativeHandle(ref, () => ({

    getAlert() {
      alert("getAlert from Child");
    }

  }));

  return <h1>Hi</h1>;
});

const Parent = () => {
  // In order to gain access to the child component instance,
  // you need to assign it to a `ref`, so we call `useRef()` to get one
  const childRef = useRef();

  return (
    <div>
      <Child ref={childRef} />
      <button onClick={() => childRef.current.getAlert()}>Click</button>
    </div>
  );
};

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

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"use ref call parent component to child react" Code Answer's