UseRef() in react

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>
    </>
  );
}

Source: reactjs.org

What does useref do react

const refContainer = useRef(initialValue);
//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.

Source: reactjs.org

UseRef() in 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>
    </>
  );
}

Source: reactjs.org

Useref

  const inputEl = useRef(null);

Useref in react

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>;
}

Source: dmitripavlutin.com

Similar codes

0 vote152 views1 answer
How to add icon in react
Javascript React
-1 vote168 views1 answer
Component navigation without changin the url react router
Javascript React
0 vote154 views1 answer
Access to XMLHttpRequest has been blocked by CORS policy React
Javascript React
8 votes159 views4 answers
Get react version
Javascript React
0 vote190 views1 answer
Ionic react use yarn
Javascript React
0 vote159 views1 answer
Websocket with Node and React
Javascript React
18 votes166 views6 answers
Uselocation react
Javascript React
0 vote179 views1 answer
React native height full
Javascript React
19 votes226 views6 answers
Convert svg to react component
Javascript React
3 votes141 views1 answer
UseHistory is not exported form react-router-dom
Javascript React