useRef
/*
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>
</>
);
}useref in functional component
import React, { useRef } from 'react';
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>
</>
);
}useref in react hooks
import { useRef } from 'react';
function LogButtonClicks() {
const countRef = useRef(0);
const handle = () => {
countRef.current++; console.log(`Clicked ${countRef.current} times`);
};
console.log('I rendered!');
return <button onClick={handle}>Click me</button>;
}Copyright © 2021 Codeinu
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