From 2747a6ba6688c515ad69673bc6831031737b2b80 Mon Sep 17 00:00:00 2001 From: Saugat Acharya Date: Fri, 29 Dec 2017 14:34:27 +0545 Subject: [PATCH] Hello world of React --- public/index.html | 2 +- public/manifest.json | 4 +- src/App.css | 28 --------- src/App.js | 25 +++----- src/App.test.js | 8 --- src/index.css | 5 -- src/index.js | 5 +- src/logo.svg | 7 --- src/registerServiceWorker.js | 108 ----------------------------------- 9 files changed, 13 insertions(+), 179 deletions(-) delete mode 100644 src/App.css delete mode 100644 src/App.test.js delete mode 100644 src/index.css delete mode 100644 src/logo.svg delete mode 100644 src/registerServiceWorker.js diff --git a/public/index.html b/public/index.html index ed0ebaf..1e2b1fb 100644 --- a/public/index.html +++ b/public/index.html @@ -19,7 +19,7 @@ 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`. --> - React App + Learn React

Welcome to React

- To get started, edit src/App.js and save to reload. -

- tag. + */ +function App() { + return ( + Let's Learn React, div); -}); diff --git a/src/index.css b/src/index.css deleted file mode 100644 index b4cc725..0000000 --- a/src/index.css +++ /dev/null @@ -1,5 +0,0 @@ -body { - margin: 0; - padding: 0; - font-family: sans-serif; -} diff --git a/src/index.js b/src/index.js index fae3e35..a6aac8d 100644 --- a/src/index.js +++ b/src/index.js @@ -1,8 +1,7 @@ import React from 'react'; import ReactDOM from 'react-dom'; -import './index.css'; + import App from './App'; -import registerServiceWorker from './registerServiceWorker'; +// Render a React element to the DOM ReactDOM.render(, document.getElementById('root')); -registerServiceWorker(); diff --git a/src/logo.svg b/src/logo.svg deleted file mode 100644 index 6b60c10..0000000 --- a/src/logo.svg +++ /dev/null @@ -1,7 +0,0 @@ - diff --git a/src/registerServiceWorker.js b/src/registerServiceWorker.js deleted file mode 100644 index 12542ba..0000000 --- a/src/registerServiceWorker.js +++ /dev/null @@ -1,108 +0,0 @@ -// In production, we register a service worker to serve assets from local cache. - -// This lets the app load faster on subsequent visits in production, and gives -// it offline capabilities. However, it also means that developers (and users) -// will only see deployed updates on the "N+1" visit to a page, since previously -// cached resources are updated in the background. - -// To learn more about the benefits of this model, read https://goo.gl/KwvDNy. -// This link also includes instructions on opting out of this behavior. - -const isLocalhost = Boolean( - window.location.hostname === 'localhost' || - // [::1] is the IPv6 localhost address. - window.location.hostname === '[::1]' || - // 127.0.0.1/8 is considered localhost for IPv4. - window.location.hostname.match( - /^127(?:\.(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)){3}$/ - ) -); - -export default function register() { - if (process.env.NODE_ENV === 'production' && 'serviceWorker' in navigator) { - // The URL constructor is available in all browsers that support SW. - const publicUrl = new URL(process.env.PUBLIC_URL, window.location); - if (publicUrl.origin !== window.location.origin) { - // Our service worker won't work if PUBLIC_URL is on a different origin - // from what our page is served on. This might happen if a CDN is used to - // serve assets; see https://github.com/facebookincubator/create-react-app/issues/2374 - return; - } - - window.addEventListener('load', () => { - const swUrl = `${process.env.PUBLIC_URL}/service-worker.js`; - - if (isLocalhost) { - // This is running on localhost. Lets check if a service worker still exists or not. - checkValidServiceWorker(swUrl); - } else { - // Is not local host. Just register service worker - registerValidSW(swUrl); - } - }); - } -} - -function registerValidSW(swUrl) { - navigator.serviceWorker - .register(swUrl) - .then(registration => { - registration.onupdatefound = () => { - const installingWorker = registration.installing; - installingWorker.onstatechange = () => { - if (installingWorker.state === 'installed') { - if (navigator.serviceWorker.controller) { - // At this point, the old content will have been purged and - // the fresh content will have been added to the cache. - // It's the perfect time to display a "New content is - // available; please refresh." message in your web app. - console.log('New content is available; please refresh.'); - } else { - // At this point, everything has been precached. - // It's the perfect time to display a - // "Content is cached for offline use." message. - console.log('Content is cached for offline use.'); - } - } - }; - }; - }) - .catch(error => { - console.error('Error during service worker registration:', error); - }); -} - -function checkValidServiceWorker(swUrl) { - // Check if the service worker can be found. If it can't reload the page. - fetch(swUrl) - .then(response => { - // Ensure service worker exists, and that we really are getting a JS file. - if ( - response.status === 404 || - response.headers.get('content-type').indexOf('javascript') === -1 - ) { - // No service worker found. Probably a different app. Reload the page. - navigator.serviceWorker.ready.then(registration => { - registration.unregister().then(() => { - window.location.reload(); - }); - }); - } else { - // Service worker found. Proceed as normal. - registerValidSW(swUrl); - } - }) - .catch(() => { - console.log( - 'No internet connection found. App is running in offline mode.' - ); - }); -} - -export function unregister() { - if ('serviceWorker' in navigator) { - navigator.serviceWorker.ready.then(registration => { - registration.unregister(); - }); - } -}