react.useref

useRef returns a mutable ref object whose .current property is initialized to the passed argument (initialValue). The returned object will persist for the full lifetime of the component.
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function TextInputWithFocusButton() {
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  const inputEl = useRef(null);
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  const onButtonClick = () => {
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    // `current` points to the mounted text input element
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    inputEl.current.focus();
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  };
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  return (
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    <>
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      <input ref={inputEl} type="text" />
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      <button onClick={onButtonClick}>Focus the input</button>
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    </>
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  );
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}
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Keep in mind that useRef doesn’t notify you when its content changes. Mutating the .current property doesn’t cause a re-render. If you want to run some code when React attaches or detaches a ref to a DOM node, you may want to use a callback ref instead.

react useeffect

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