Useref 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

UseReducer

const initialState = {count: 0};

function reducer(state, action) {
  switch (action.type) {
    case 'increment':
      return {count: state.count + 1};
    case 'decrement':
      return {count: state.count - 1};
    default:
      throw new Error();
  }
}

function Counter() {
  const [state, dispatch] = useReducer(reducer, initialState);
  return (
    <>
      Count: {state.count}
      <button onClick={() => dispatch({type: 'decrement'})}>-</button>
      <button onClick={() => dispatch({type: 'increment'})}>+</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 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 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

Similar codes

0 vote256 views1 answer
React native swipe screen
Javascript React
0 vote248 views1 answer
React native stopwatch
Javascript React
0 vote263 views1 answer
Olx clone react
Javascript React
64 votes212 views4 answers
How to install react-router-dom in react js
Javascript React
0 vote232 views1 answer
React build size
Javascript React
48 votes249 views4 answers
How to add comment in react js
Javascript React
0 vote233 views1 answer
Using redux on react extension
Javascript React
0 vote229 views1 answer
${product} meaning in react js
Javascript React
1 vote228 views1 answer
Button doesn't work while keyboard is shown react native
Javascript React
2 votes230 views1 answer
React nginx returns 404 after reload
Javascript React