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Transitioning DocumentFragment into React.Fragment
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BROSWER=none |
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import React, { useState } from 'react' | |
const App = () => { | |
const [counter, setCounter] = useState(0) | |
const [visibility, setVisibility] = useState(false) | |
const handleCounter = () => { | |
if(counter > 10) { | |
setVisibility(true) | |
} | |
return setCounter(prevState => prevState + 1) | |
} | |
const resetCounter = () => { | |
setCounter(0) | |
setVisibility(false) | |
} | |
return ( | |
<div> | |
<button onClick={handleCounter}>Click me</button> | |
<p style={{color: "red"}}>Count: {counter}</p> | |
{visibility === true && <button onClick={resetCounter}>Reset Button</button>} | |
</div> | |
) | |
} | |
export default App; |
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<!DOCTYPE html> | |
<html lang="en"> | |
<head> | |
<meta charset="utf-8" /> | |
<link rel="icon" href="%PUBLIC_URL%/favicon.ico" /> | |
<meta name="viewport" content="width=device-width, initial-scale=1" /> | |
<meta name="theme-color" content="#000000" /> | |
<meta | |
name="description" | |
content="Web site created using create-react-app" | |
/> | |
<link rel="apple-touch-icon" href="%PUBLIC_URL%/logo192.png" /> | |
<!-- | |
manifest.json provides metadata used when your web app is installed on a | |
user's mobile device or desktop. See https://developers.google.com/web/fundamentals/web-app-manifest/ | |
--> | |
<link rel="manifest" href="%PUBLIC_URL%/manifest.json" /> | |
<!-- | |
Notice the use of %PUBLIC_URL% in the tags above. | |
It will be replaced with the URL of the `public` folder during the build. | |
Only files inside the `public` folder can be referenced from the HTML. | |
Unlike "/favicon.ico" or "favicon.ico", "%PUBLIC_URL%/favicon.ico" will | |
work correctly both with client-side routing and a non-root public URL. | |
Learn how to configure a non-root public URL by running `npm run build`. | |
--> | |
<title>React App</title> | |
</head> | |
<body> | |
<noscript>You need to enable JavaScript to run this app.</noscript> | |
<div id="root"></div> | |
<!-- | |
This HTML file is a template. | |
If you open it directly in the browser, you will see an empty page. | |
You can add webfonts, meta tags, or analytics to this file. | |
The build step will place the bundled scripts into the <body> tag. | |
To begin the development, run `npm start` or `yarn start`. | |
To create a production bundle, use `npm run build` or `yarn build`. | |
--> | |
</body> | |
</html> |
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import React from 'react'; | |
import ReactDOM from 'react-dom'; | |
import './index.css'; | |
import App from './App'; | |
import reportWebVitals from './reportWebVitals'; | |
ReactDOM.render( | |
<React.StrictMode> | |
<App /> | |
</React.StrictMode>, | |
document.getElementById('root') | |
); | |
// If you want to start measuring performance in your app, pass a function | |
// to log results (for example: reportWebVitals(console.log)) | |
// or send to an analytics endpoint. Learn more: https://bit.ly/CRA-vitals | |
reportWebVitals(); |
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