example react useref

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Pedro
24 Oct 2020
1/*
2	A common use case is to access a child imperatively: 
3*/
4
5function TextInputWithFocusButton() {
6  const inputEl = useRef(null);
7  const onButtonClick = () => {
8    // `current` points to the mounted text input element
9    inputEl.current.focus();
10  };
11  return (
12    <>
13      <input ref={inputEl} type="text" />
14      <button onClick={onButtonClick}>Focus the input</button>
15    </>
16  );
17}
Alex
16 Apr 2019
1import React, { useState, useEffect, useRef } from "react";
2import ReactDOM from "react-dom";
3
4import "./styles.css";
5
6function CountMyRenders() {
7  const countRenderRef = useRef(1);
8
9  useEffect(function afterRender() {
10    countRenderRef.current++;
11  });
12
13  return <div>I've rendered {countRenderRef.current} times</div>;
14}
15
16function App() {
17  const [count, setCount] = useState(0);
18  return (
19    <div className="App">
20      <CountMyRenders />
21      <button onClick={() => setCount(count => count + 1)}>
22        Click to re-render
23      </button>
24    </div>
25  );
26}
27
28const rootElement = document.getElementById("root");
29ReactDOM.render(<App />, rootElement);
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