useRef example

/*
	A common use case is to access a child imperatively: 
*/

function TextInputWithFocusButton() {
  const inputEl = useRef(null);
  const onButtonClick = () => {
    // `current` points to the mounted text input element
    inputEl.current.focus();
  };
  return (
    <>
      <input ref={inputEl} type="text" />
      <button onClick={onButtonClick}>Focus the input</button>
    </>
  );
}

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Filip Skakun 70 points

                                    import React, {useRef, useEffect} from &quot;react&quot;;

export default function (props) {
  // Initialized a hook to hold the reference to the title div.
  const titleRef = useRef();
  
  useEffect(function () {
    setTimeout(() =&gt; {
      titleRef.current.textContent = &quot;Updated Text&quot;
    }, 2000); // Update the content of the element after 2seconds 
  }, []);
  
  return &lt;div className=&quot;container&quot;&gt;
    {/** The reference to the element happens here **/ }
    &lt;div className=&quot;title&quot; ref={titleRef}&gt;Original title&lt;/div&gt;
  &lt;/div&gt;
}

Thank you! 1

4 (1 Votes)

4.13

William Charles Harwood 110 points

                                    import React, { useRef, useEffect } from 'react';

function CountMyRenders() {
  const countRenderRef = useRef(1);
  
  useEffect(function afterRender() {
    countRenderRef.current++;  });

  return (
    &lt;div&gt;I've rendered {countRenderRef.current} times&lt;/div&gt;
  );
}

Thank you! 8

4.13 (8 Votes)

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