React on hover code example

Example 1: react html mouseover

function changeBackground(e) {
    e.target.style.background = 'red';
  }

  return (
    <div className="App">
      <button onMouseOver={changeBackground}>Hover over me!</button>
    </div>
  );

Example 2: react on hover reveal

import React, {useState} from "react";

export default function ShowButtonHover() {
    const [style, setStyle] = useState({display: 'none'});

    return (
        <div className="App">
            <h2>Hidden Button in the box. Move mouse in the box</h2>
            <div style={{border: '1px solid gray', width: 300, height: 300, padding: 10, margin: 100}}
                 onMouseEnter={e => {
                     setStyle({display: 'block'});
                 }}
                 onMouseLeave={e => {
                     setStyle({display: 'none'})
                 }}
            >
                <button style={style}>Click</button>
            </div>
        </div>
    );
}

Example 3: jsx .style on hover react

import styles from './Button.css'

const MyButton = ({children, onClick, type='primary', ...rest }) =>
(
    <button
        onClick   = {onClick}
        className = {styles.primary}
        {...rest}
    >
        {children}
    </button>
);