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

5 votes207 views2 answers
React native components
Javascript React
112 votes279 views5 answers
Command to create react app
Javascript React
0 vote206 views1 answer
React native app crashing on start
Javascript React
1 vote213 views5 answers
React datepicker
Javascript React
0 vote210 views1 answer
React native bottom bar curved
Javascript React
0 vote214 views1 answer
How to disable button if errors object isnt empty in react hook form
Javascript React
21 votes219 views4 answers
React font awesome npm
Javascript React
0 vote240 views1 answer
How to use radio buttons in react class-based components
Javascript React
34 votes210 views3 answers
React-router
Javascript React
10 votes215 views4 answers
Attempted import error 'switch' is not exported from 'react-router-dom'. in react js
Javascript React