Useref in react hooks

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 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>
    </>
  );
}

Source: reactjs.org

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>;
}

Source: dmitripavlutin.com

Similar codes

-2 votes381 views2 answers
How to play around with backend node js and frontend react
Javascript React
1 vote418 views1 answer
Reactjs cloudflare
Javascript React
0 vote427 views1 answer
How to change height of bottom material tab navigator from react-naviagtion
Javascript React
1 vote351 views1 answer
How to remove name in react navigation header
Javascript React
2 votes375 views1 answer
React router 404 redirect
Javascript React
0 vote356 views1 answer
React native force vertical
Javascript React
4 votes383 views1 answer
React router history push parameter
Javascript React
0 vote372 views1 answer
React native firebase email verification
Javascript React
0 vote361 views1 answer
Retore react app
Javascript React
0 vote376 views1 answer
Image and video lightbox react
Javascript React