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

0 vote309 views1 answer
Debug.xcconfig: unable to open file react native
Javascript React
0 vote302 views1 answer
ScrollspyNav react
Javascript React
15 votes265 views1 answer
Reducer in react example
Javascript React
1 vote257 views1 answer
React redux not updating
Javascript React
6 votes252 views1 answer
React-native loading spinner
Javascript React
0 vote265 views1 answer
React overflow scroll
Javascript React
0 vote257 views1 answer
React native icon onpress remove highlight onpress
Javascript React
48 votes283 views4 answers
How to add comment in react js
Javascript React
0 vote265 views1 answer
Row smaller than the container bootstrap react
Javascript React
6 votes246 views2 answers
UseHistory react-router-dom
Javascript React