├── .gitignore ├── .idea ├── .gitignore ├── inspectionProfiles │ └── Project_Default.xml ├── misc.xml ├── modules.xml ├── react-context-tutorial.iml └── vcs.xml ├── README.md ├── package-lock.json ├── package.json ├── public ├── favicon.ico ├── index.html ├── logo192.png ├── logo512.png ├── manifest.json └── robots.txt └── src ├── API.js ├── App.js ├── Assets └── react-logo.png ├── Components ├── PostList.js ├── PostListItem.js ├── Spinner.js └── UserSelectDropdown.js ├── Contexts └── PostProvider.js ├── index.css ├── index.js └── serviceWorker.js /.gitignore: -------------------------------------------------------------------------------- 1 | # Logs 2 | logs 3 | *.log 4 | npm-debug.log* 5 | yarn-debug.log* 6 | yarn-error.log* 7 | lerna-debug.log* 8 | 9 | # Diagnostic reports (https://nodejs.org/api/report.html) 10 | report.[0-9]*.[0-9]*.[0-9]*.[0-9]*.json 11 | 12 | # Runtime data 13 | pids 14 | *.pid 15 | *.seed 16 | *.pid.lock 17 | 18 | # Directory for instrumented libs generated by jscoverage/JSCover 19 | lib-cov 20 | 21 | # Coverage directory used by tools like istanbul 22 | coverage 23 | *.lcov 24 | 25 | # nyc test coverage 26 | .nyc_output 27 | 28 | # Grunt intermediate storage (https://gruntjs.com/creating-plugins#storing-task-files) 29 | .grunt 30 | 31 | # Bower dependency directory (https://bower.io/) 32 | bower_components 33 | 34 | # node-waf configuration 35 | .lock-wscript 36 | 37 | # Compiled binary addons (https://nodejs.org/api/addons.html) 38 | build/Release 39 | 40 | # Dependency directories 41 | node_modules/ 42 | jspm_packages/ 43 | 44 | # TypeScript v1 declaration files 45 | typings/ 46 | 47 | # TypeScript cache 48 | *.tsbuildinfo 49 | 50 | # Optional npm cache directory 51 | .npm 52 | 53 | # Optional eslint cache 54 | .eslintcache 55 | 56 | # Microbundle cache 57 | .rpt2_cache/ 58 | .rts2_cache_cjs/ 59 | .rts2_cache_es/ 60 | .rts2_cache_umd/ 61 | 62 | # Optional REPL history 63 | .node_repl_history 64 | 65 | # Output of 'npm pack' 66 | *.tgz 67 | 68 | # Yarn Integrity file 69 | .yarn-integrity 70 | 71 | # dotenv environment variables file 72 | .env 73 | .env.test 74 | 75 | # parcel-bundler cache (https://parceljs.org/) 76 | .cache 77 | 78 | # Next.js build output 79 | .next 80 | 81 | # Nuxt.js build / generate output 82 | .nuxt 83 | dist 84 | 85 | # Gatsby files 86 | .cache/ 87 | # Comment in the public line in if your project uses Gatsby and *not* Next.js 88 | # https://nextjs.org/blog/next-9-1#public-directory-support 89 | # public 90 | 91 | # vuepress build output 92 | .vuepress/dist 93 | 94 | # Serverless directories 95 | .serverless/ 96 | 97 | # FuseBox cache 98 | .fusebox/ 99 | 100 | # DynamoDB Local files 101 | .dynamodb/ 102 | 103 | # TernJS port file 104 | .tern-port 105 | -------------------------------------------------------------------------------- /.idea/.gitignore: -------------------------------------------------------------------------------- 1 | # Default ignored files 2 | /workspace.xml 3 | -------------------------------------------------------------------------------- /.idea/inspectionProfiles/Project_Default.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 6 | -------------------------------------------------------------------------------- /.idea/misc.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 6 | -------------------------------------------------------------------------------- /.idea/modules.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | -------------------------------------------------------------------------------- /.idea/react-context-tutorial.iml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | -------------------------------------------------------------------------------- /.idea/vcs.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # react-context-example 2 | A complete example of how to architect a React app using the Context API 3 | -------------------------------------------------------------------------------- /package.json: -------------------------------------------------------------------------------- 1 | { 2 | "name": "react-context-tutorial", 3 | "version": "0.1.0", 4 | "private": true, 5 | "dependencies": { 6 | "@testing-library/jest-dom": "^4.2.4", 7 | "@testing-library/react": "^9.5.0", 8 | "@testing-library/user-event": "^7.2.1", 9 | "bootstrap": "^4.5.0", 10 | "react": "^16.13.1", 11 | "react-dom": "^16.13.1", 12 | "react-scripts": "3.4.1" 13 | }, 14 | "scripts": { 15 | "start": "react-scripts start", 16 | "build": "react-scripts build", 17 | "test": "react-scripts test", 18 | "eject": "react-scripts eject" 19 | }, 20 | "eslintConfig": { 21 | "extends": "react-app" 22 | }, 23 | "browserslist": { 24 | "production": [ 25 | ">0.2%", 26 | "not dead", 27 | "not op_mini all" 28 | ], 29 | "development": [ 30 | "last 1 chrome version", 31 | "last 1 firefox version", 32 | "last 1 safari version" 33 | ] 34 | } 35 | } 36 | -------------------------------------------------------------------------------- /public/favicon.ico: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/upmostly/react-context-example/5e890aca40b88315dd1e6b655f433e82b2b9fc98/public/favicon.ico -------------------------------------------------------------------------------- /public/index.html: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 12 | 13 | 17 | 18 | 27 | PostSmash 28 | 29 | 30 | 31 |
32 | 42 | 43 | 44 | -------------------------------------------------------------------------------- /public/logo192.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/upmostly/react-context-example/5e890aca40b88315dd1e6b655f433e82b2b9fc98/public/logo192.png -------------------------------------------------------------------------------- /public/logo512.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/upmostly/react-context-example/5e890aca40b88315dd1e6b655f433e82b2b9fc98/public/logo512.png -------------------------------------------------------------------------------- /public/manifest.json: -------------------------------------------------------------------------------- 1 | { 2 | "short_name": "React App", 3 | "name": "Create React App Sample", 4 | "icons": [ 5 | { 6 | "src": "favicon.ico", 7 | "sizes": "64x64 32x32 24x24 16x16", 8 | "type": "image/x-icon" 9 | }, 10 | { 11 | "src": "logo192.png", 12 | "type": "image/png", 13 | "sizes": "192x192" 14 | }, 15 | { 16 | "src": "logo512.png", 17 | "type": "image/png", 18 | "sizes": "512x512" 19 | } 20 | ], 21 | "start_url": ".", 22 | "display": "standalone", 23 | "theme_color": "#000000", 24 | "background_color": "#ffffff" 25 | } 26 | -------------------------------------------------------------------------------- /public/robots.txt: -------------------------------------------------------------------------------- 1 | # https://www.robotstxt.org/robotstxt.html 2 | User-agent: * 3 | Disallow: 4 | -------------------------------------------------------------------------------- /src/API.js: -------------------------------------------------------------------------------- 1 | // The interface used to communicate to the JSONPlaceholder API 2 | 3 | export const getPostsFromDatabase = async () => await (await fetch('https://jsonplaceholder.typicode.com/posts')).json(); 4 | 5 | export const getPostsFromDatabaseForUserWithId = async userId => await (await fetch(`https://jsonplaceholder.typicode.com/users/${userId}/posts`)).json(); 6 | 7 | export const deletePostFromDatabaseWithId = async postId => await (await fetch(`https://jsonplaceholder.typicode.com/posts/${postId}`, { method: 'DELETE'})).json(); 8 | -------------------------------------------------------------------------------- /src/App.js: -------------------------------------------------------------------------------- 1 | import React from 'react'; 2 | import reactLogo from './Assets/react-logo.png'; 3 | import PostList from './Components/PostList'; 4 | import PostProvider, {PostContext} from './Contexts/PostProvider'; 5 | import UserSelectDropdown from './Components/UserSelectDropdown'; 6 | import PostListItem from './Components/PostListItem'; 7 | import Spinner from './Components/Spinner'; 8 | 9 | const App = () => ( 10 |
11 |
12 |
13 | React Logo 14 |
15 |
16 | 17 | 18 | {({ isLoading, posts, getPostsForUserWithId, deletePostWithId }) => ( 19 | <> 20 | getPostsForUserWithId(userId)} /> 21 | {isLoading ? : ( 22 | 23 | {posts.map(post => ( 24 | 28 | ))} 29 | 30 | )} 31 | 32 | )} 33 | 34 | 35 |
36 |
37 |
38 | ); 39 | 40 | export default App; 41 | -------------------------------------------------------------------------------- /src/Assets/react-logo.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/upmostly/react-context-example/5e890aca40b88315dd1e6b655f433e82b2b9fc98/src/Assets/react-logo.png -------------------------------------------------------------------------------- /src/Components/PostList.js: -------------------------------------------------------------------------------- 1 | import React from 'react'; 2 | 3 | const PostList = ({ children }) => { 4 | return ( 5 | <> 6 |
7 | {children} 8 |
9 | 10 | ); 11 | }; 12 | 13 | export default PostList; 14 | -------------------------------------------------------------------------------- /src/Components/PostListItem.js: -------------------------------------------------------------------------------- 1 | import React from 'react'; 2 | 3 | const PostListItem = ({ id, body, title, userId, handleDeleteClicked }) => { 4 | return ( 5 | <> 6 |
7 |
8 |
{title}
9 | Id: {id} 10 |
11 |

{body}

12 |
13 | 14 | User Id: {userId} 15 |
16 |
17 | 18 | ); 19 | }; 20 | 21 | export default PostListItem; 22 | -------------------------------------------------------------------------------- /src/Components/Spinner.js: -------------------------------------------------------------------------------- 1 | import React from 'react'; 2 | 3 | const Spinner = () => { 4 | return ( 5 |
6 |
7 |
8 | Loading... 9 |
10 |
11 |
12 | ); 13 | }; 14 | 15 | export default Spinner; 16 | -------------------------------------------------------------------------------- /src/Components/UserSelectDropdown.js: -------------------------------------------------------------------------------- 1 | import React from 'react'; 2 | 3 | const UserSelectDropdown = ({ handleChange }) => { 4 | return ( 5 | <> 6 | 12 | 13 | ); 14 | }; 15 | 16 | export default UserSelectDropdown; 17 | -------------------------------------------------------------------------------- /src/Contexts/PostProvider.js: -------------------------------------------------------------------------------- 1 | import React, { useState, useEffect } from 'react'; 2 | import {deletePostFromDatabaseWithId, getPostsFromDatabase, getPostsFromDatabaseForUserWithId} from '../API'; 3 | 4 | export const PostContext = React.createContext({}); 5 | 6 | const PostProvider = ({ children }) => { 7 | const [isLoading, setIsLoading] = useState(true); 8 | const [posts, setPosts] = useState([]); 9 | 10 | async function getAllPosts() { 11 | setIsLoading(true); 12 | const postsResponse = await getPostsFromDatabase(); 13 | setPosts(postsResponse); 14 | setIsLoading(false); 15 | } 16 | 17 | async function getPostsForUserWithId(userId) { 18 | setIsLoading(true); 19 | const postsResponse = await getPostsFromDatabaseForUserWithId(userId); 20 | setPosts(postsResponse); 21 | setIsLoading(false); 22 | } 23 | 24 | async function deletePostWithId(postId) { 25 | setIsLoading(true); 26 | await deletePostFromDatabaseWithId(postId); 27 | setIsLoading(false); 28 | } 29 | 30 | useEffect(() => { 31 | getAllPosts(); 32 | }, []); 33 | 34 | return ( 35 | 43 | {children} 44 | 45 | ); 46 | }; 47 | 48 | export default PostProvider; 49 | -------------------------------------------------------------------------------- /src/index.css: -------------------------------------------------------------------------------- 1 | body { 2 | margin: 0; 3 | font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 4 | 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', 5 | sans-serif; 6 | -webkit-font-smoothing: antialiased; 7 | -moz-osx-font-smoothing: grayscale; 8 | } 9 | 10 | code { 11 | font-family: source-code-pro, Menlo, Monaco, Consolas, 'Courier New', 12 | monospace; 13 | } 14 | -------------------------------------------------------------------------------- /src/index.js: -------------------------------------------------------------------------------- 1 | import React from 'react'; 2 | import ReactDOM from 'react-dom'; 3 | import './index.css'; 4 | import 'bootstrap/dist/css/bootstrap.css'; 5 | import App from './App'; 6 | import * as serviceWorker from './serviceWorker'; 7 | 8 | ReactDOM.render( 9 | 10 | 11 | , 12 | document.getElementById('root') 13 | ); 14 | 15 | // If you want your app to work offline and load faster, you can change 16 | // unregister() to register() below. Note this comes with some pitfalls. 17 | // Learn more about service workers: https://bit.ly/CRA-PWA 18 | serviceWorker.unregister(); 19 | -------------------------------------------------------------------------------- /src/serviceWorker.js: -------------------------------------------------------------------------------- 1 | // This optional code is used to register a service worker. 2 | // register() is not called by default. 3 | 4 | // This lets the app load faster on subsequent visits in production, and gives 5 | // it offline capabilities. However, it also means that developers (and users) 6 | // will only see deployed updates on subsequent visits to a page, after all the 7 | // existing tabs open on the page have been closed, since previously cached 8 | // resources are updated in the background. 9 | 10 | // To learn more about the benefits of this model and instructions on how to 11 | // opt-in, read https://bit.ly/CRA-PWA 12 | 13 | const isLocalhost = Boolean( 14 | window.location.hostname === 'localhost' || 15 | // [::1] is the IPv6 localhost address. 16 | window.location.hostname === '[::1]' || 17 | // 127.0.0.0/8 are considered localhost for IPv4. 18 | window.location.hostname.match( 19 | /^127(?:\.(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)){3}$/ 20 | ) 21 | ); 22 | 23 | export function register(config) { 24 | if (process.env.NODE_ENV === 'production' && 'serviceWorker' in navigator) { 25 | // The URL constructor is available in all browsers that support SW. 26 | const publicUrl = new URL(process.env.PUBLIC_URL, window.location.href); 27 | if (publicUrl.origin !== window.location.origin) { 28 | // Our service worker won't work if PUBLIC_URL is on a different origin 29 | // from what our page is served on. This might happen if a CDN is used to 30 | // serve assets; see https://github.com/facebook/create-react-app/issues/2374 31 | return; 32 | } 33 | 34 | window.addEventListener('load', () => { 35 | const swUrl = `${process.env.PUBLIC_URL}/service-worker.js`; 36 | 37 | if (isLocalhost) { 38 | // This is running on localhost. Let's check if a service worker still exists or not. 39 | checkValidServiceWorker(swUrl, config); 40 | 41 | // Add some additional logging to localhost, pointing developers to the 42 | // service worker/PWA documentation. 43 | navigator.serviceWorker.ready.then(() => { 44 | console.log( 45 | 'This web app is being served cache-first by a service ' + 46 | 'worker. To learn more, visit https://bit.ly/CRA-PWA' 47 | ); 48 | }); 49 | } else { 50 | // Is not localhost. Just register service worker 51 | registerValidSW(swUrl, config); 52 | } 53 | }); 54 | } 55 | } 56 | 57 | function registerValidSW(swUrl, config) { 58 | navigator.serviceWorker 59 | .register(swUrl) 60 | .then(registration => { 61 | registration.onupdatefound = () => { 62 | const installingWorker = registration.installing; 63 | if (installingWorker == null) { 64 | return; 65 | } 66 | installingWorker.onstatechange = () => { 67 | if (installingWorker.state === 'installed') { 68 | if (navigator.serviceWorker.controller) { 69 | // At this point, the updated precached content has been fetched, 70 | // but the previous service worker will still serve the older 71 | // content until all client tabs are closed. 72 | console.log( 73 | 'New content is available and will be used when all ' + 74 | 'tabs for this page are closed. See https://bit.ly/CRA-PWA.' 75 | ); 76 | 77 | // Execute callback 78 | if (config && config.onUpdate) { 79 | config.onUpdate(registration); 80 | } 81 | } else { 82 | // At this point, everything has been precached. 83 | // It's the perfect time to display a 84 | // "Content is cached for offline use." message. 85 | console.log('Content is cached for offline use.'); 86 | 87 | // Execute callback 88 | if (config && config.onSuccess) { 89 | config.onSuccess(registration); 90 | } 91 | } 92 | } 93 | }; 94 | }; 95 | }) 96 | .catch(error => { 97 | console.error('Error during service worker registration:', error); 98 | }); 99 | } 100 | 101 | function checkValidServiceWorker(swUrl, config) { 102 | // Check if the service worker can be found. If it can't reload the page. 103 | fetch(swUrl, { 104 | headers: { 'Service-Worker': 'script' }, 105 | }) 106 | .then(response => { 107 | // Ensure service worker exists, and that we really are getting a JS file. 108 | const contentType = response.headers.get('content-type'); 109 | if ( 110 | response.status === 404 || 111 | (contentType != null && contentType.indexOf('javascript') === -1) 112 | ) { 113 | // No service worker found. Probably a different app. Reload the page. 114 | navigator.serviceWorker.ready.then(registration => { 115 | registration.unregister().then(() => { 116 | window.location.reload(); 117 | }); 118 | }); 119 | } else { 120 | // Service worker found. Proceed as normal. 121 | registerValidSW(swUrl, config); 122 | } 123 | }) 124 | .catch(() => { 125 | console.log( 126 | 'No internet connection found. App is running in offline mode.' 127 | ); 128 | }); 129 | } 130 | 131 | export function unregister() { 132 | if ('serviceWorker' in navigator) { 133 | navigator.serviceWorker.ready 134 | .then(registration => { 135 | registration.unregister(); 136 | }) 137 | .catch(error => { 138 | console.error(error.message); 139 | }); 140 | } 141 | } 142 | --------------------------------------------------------------------------------