├── .gitignore ├── LICENSE ├── README.md ├── package.json ├── public ├── favicon.ico ├── index.html ├── logo192.png ├── logo512.png ├── manifest.json └── robots.txt ├── src ├── App.js ├── App.test.js ├── components │ ├── contact-form.js │ ├── contact-table.js │ ├── counter-buttons.js │ └── counter-display.js ├── context │ ├── contact-context.js │ └── counter-context.js ├── index.css ├── index.js ├── serviceWorker.js ├── setupTests.js └── views │ ├── contact-view.js │ └── counter-view.js └── yarn.lock /.gitignore: -------------------------------------------------------------------------------- 1 | # See https://help.github.com/articles/ignoring-files/ for more about ignoring files. 2 | 3 | # dependencies 4 | /node_modules 5 | /.pnp 6 | .pnp.js 7 | 8 | # testing 9 | /coverage 10 | 11 | # production 12 | /build 13 | 14 | # misc 15 | .DS_Store 16 | .env.local 17 | .env.development.local 18 | .env.test.local 19 | .env.production.local 20 | 21 | npm-debug.log* 22 | yarn-debug.log* 23 | yarn-error.log* 24 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | MIT License 2 | 3 | Copyright (c) 2020 Michael Wanyoike 4 | 5 | Permission is hereby granted, free of charge, to any person obtaining a copy 6 | of this software and associated documentation files (the "Software"), to deal 7 | in the Software without restriction, including without limitation the rights 8 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 9 | copies of the Software, and to permit persons to whom the Software is 10 | furnished to do so, subject to the following conditions: 11 | 12 | The above copyright notice and this permission notice shall be included in all 13 | copies or substantial portions of the Software. 14 | 15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 18 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 20 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 21 | SOFTWARE. 22 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # React Hooks Context Example App 2 | 3 | An example project demonstrating how to manage global state using React Hooks and the Context API. This project was built using [create-react-app](https://github.com/facebook/create-react-app). 4 | 5 | You can find the tutorial for this project [here](https://www.sitepoint.com/replace-redux-react-hooks-context-api/.) 6 | 7 | ## How to Run 8 | 9 | ```bash 10 | $ git clone git@github.com:brandiqa/react-hooks-context-app.git 11 | $ cd react-hooks-context-app 12 | $ yarn install 13 | $ yarn start 14 | ``` 15 | 16 | ## LICENSE 17 | 18 | MIT License 19 | 20 | Copyright (c) 2020 Michael Wanyoike 21 | 22 | Permission is hereby granted, free of charge, to any person obtaining a copy 23 | of this software and associated documentation files (the "Software"), to deal 24 | in the Software without restriction, including without limitation the rights 25 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 26 | copies of the Software, and to permit persons to whom the Software is 27 | furnished to do so, subject to the following conditions: 28 | 29 | The above copyright notice and this permission notice shall be included in all 30 | copies or substantial portions of the Software. 31 | 32 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 33 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 34 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 35 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 36 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 37 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 38 | SOFTWARE. 39 | -------------------------------------------------------------------------------- /package.json: -------------------------------------------------------------------------------- 1 | { 2 | "name": "react-hooks-context-app", 3 | "description": "An example project demonstrating how to manage global state using React Hooks and the Context API", 4 | "version": "0.1.0", 5 | "private": true, 6 | "license": "MIT", 7 | "author": { 8 | "email": "micwanyoike@gmail.com", 9 | "name": "Michael Wanyoike" 10 | }, 11 | "repository": { 12 | "type": "git", 13 | "url": "git+https://github.com/brandiqa/react-hooks-context-app.git" 14 | }, 15 | "dependencies": { 16 | "@testing-library/jest-dom": "^5.9.0", 17 | "@testing-library/react": "^10.0.4", 18 | "@testing-library/user-event": "^10.4.0", 19 | "fomantic-ui-css": "^2.8.4", 20 | "react": "^16.13.1", 21 | "react-dom": "^16.13.1", 22 | "react-scripts": "3.4.1", 23 | "semantic-ui-react": "^0.88.2" 24 | }, 25 | "scripts": { 26 | "start": "react-scripts start", 27 | "build": "react-scripts build", 28 | "test": "react-scripts test", 29 | "eject": "react-scripts eject" 30 | }, 31 | "eslintConfig": { 32 | "extends": "react-app" 33 | }, 34 | "browserslist": { 35 | "production": [ 36 | ">0.2%", 37 | "not dead", 38 | "not op_mini all" 39 | ], 40 | "development": [ 41 | "last 1 chrome version", 42 | "last 1 firefox version", 43 | "last 1 safari version" 44 | ] 45 | } 46 | } 47 | -------------------------------------------------------------------------------- /public/favicon.ico: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/brandiqa/react-hooks-context-app/db90be3b462612fdf2254a4c0d20cbfc303183ef/public/favicon.ico -------------------------------------------------------------------------------- /public/index.html: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 12 | 13 | 17 | 18 | 27 | React App 28 | 29 | 30 | 31 |
32 | 42 | 43 | 44 | -------------------------------------------------------------------------------- /public/logo192.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/brandiqa/react-hooks-context-app/db90be3b462612fdf2254a4c0d20cbfc303183ef/public/logo192.png -------------------------------------------------------------------------------- /public/logo512.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/brandiqa/react-hooks-context-app/db90be3b462612fdf2254a4c0d20cbfc303183ef/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/App.js: -------------------------------------------------------------------------------- 1 | import React from 'react'; 2 | import { Container } from "semantic-ui-react"; 3 | 4 | import CounterView from "./views/counter-view"; 5 | import ContactView from "./views/contact-view"; 6 | 7 | export default function App() { 8 | return ( 9 | 10 |

React Hooks Context Demo

11 | 12 | 13 | 14 | ) 15 | } 16 | -------------------------------------------------------------------------------- /src/App.test.js: -------------------------------------------------------------------------------- 1 | import React from 'react'; 2 | import { render } from '@testing-library/react'; 3 | import App from './App'; 4 | 5 | test('renders learn react link', () => { 6 | const { getByText } = render(); 7 | const linkElement = getByText(/learn react/i); 8 | expect(linkElement).toBeInTheDocument(); 9 | }); 10 | -------------------------------------------------------------------------------- /src/components/contact-form.js: -------------------------------------------------------------------------------- 1 | import React, { useState, useContext } from "react"; 2 | import { Segment, Form, Input, Button } from "semantic-ui-react"; 3 | import _ from "lodash"; 4 | import { ContactContext } from "../context/contact-context"; 5 | 6 | export default function ContactForm() { 7 | const name = useFormInput(""); 8 | const email = useFormInput(""); 9 | // eslint-disable-next-line no-unused-vars 10 | const [state, dispatch] = useContext(ContactContext); 11 | 12 | const onSubmit = () => { 13 | dispatch({ 14 | type: "ADD_CONTACT", 15 | payload: { id: _.uniqueId(10), name: name.value, email: email.value } 16 | }) 17 | // Reset Form 18 | name.onReset(); 19 | email.onReset(); 20 | }; 21 | 22 | return ( 23 | 24 |
25 | 26 | 27 | 28 | 29 | 30 | 31 | 32 | 33 | 36 | 37 | 38 |
39 | 40 | ); 41 | } 42 | 43 | function useFormInput(initialValue) { 44 | const [value, setValue] = useState(initialValue); 45 | 46 | const handleChange = e => { 47 | setValue(e.target.value); 48 | } 49 | 50 | const handleReset = () => { 51 | setValue(""); 52 | } 53 | 54 | return { 55 | value, 56 | onChange: handleChange, 57 | onReset: handleReset 58 | }; 59 | } 60 | -------------------------------------------------------------------------------- /src/components/contact-table.js: -------------------------------------------------------------------------------- 1 | import React, { useState, useContext } from "react"; 2 | import { Segment, Table, Button, Icon } from "semantic-ui-react"; 3 | import { ContactContext } from "../context/contact-context"; 4 | 5 | export default function ContactTable() { 6 | // Subscribe to `contacts` state and access dispatch function 7 | const [state, dispatch] = useContext(ContactContext); 8 | // Declare a local state to be used internally by this component 9 | const [selectedId, setSelectedId] = useState(); 10 | 11 | const delContact = id => { 12 | dispatch({ 13 | type: "DEL_CONTACT", 14 | payload: id 15 | }); 16 | }; 17 | 18 | const onRemoveUser = () => { 19 | delContact(selectedId); 20 | setSelectedId(null); // Clear selection 21 | }; 22 | 23 | const rows = state.contacts.map(contact => ( 24 | setSelectedId(contact.id)} 27 | active={contact.id === selectedId} 28 | > 29 | {contact.id} 30 | {contact.name} 31 | {contact.email} 32 | 33 | )); 34 | 35 | return ( 36 | 37 | 38 | 39 | 40 | Id 41 | Name 42 | Email 43 | 44 | 45 | {rows} 46 | 47 | 48 | 49 | 50 | 61 | 62 | 63 | 64 |
65 | 66 | ); 67 | } 68 | -------------------------------------------------------------------------------- /src/components/counter-buttons.js: -------------------------------------------------------------------------------- 1 | import React, { useContext } from "react"; 2 | import { Button } from "semantic-ui-react"; 3 | import { CounterContext } from "../context/counter-context"; 4 | 5 | export default function CounterButtons() { 6 | const [count, setCount] = useContext(CounterContext); 7 | 8 | const increment = () => { 9 | setCount(count + 1) 10 | } 11 | 12 | const decrement = () => { 13 | setCount(count - 1) 14 | } 15 | 16 | return ( 17 |
18 | 19 | 22 | 25 | 26 |
27 | ); 28 | } 29 | -------------------------------------------------------------------------------- /src/components/counter-display.js: -------------------------------------------------------------------------------- 1 | import React, { useContext } from "react"; 2 | import { Statistic } from "semantic-ui-react"; 3 | import { CounterContext } from "../context/counter-context"; 4 | 5 | export default function CounterDisplay() { 6 | const [count] = useContext(CounterContext); 7 | 8 | return ( 9 | 10 | {count} 11 | Counter 12 | 13 | ); 14 | } 15 | -------------------------------------------------------------------------------- /src/context/contact-context.js: -------------------------------------------------------------------------------- 1 | import React, { useReducer, createContext } from "react"; 2 | 3 | export const ContactContext = createContext(); 4 | 5 | const initialState = { 6 | contacts: [ 7 | { 8 | id: "098", 9 | name: "Diana Prince", 10 | email: "diana@us.army.mil" 11 | }, 12 | { 13 | id: "099", 14 | name: "Bruce Wayne", 15 | email: "bruce@batmail.com" 16 | }, 17 | { 18 | id: "100", 19 | name: "Clark Kent", 20 | email: "clark@metropolitan.com" 21 | } 22 | ], 23 | loading: false, 24 | error: null 25 | }; 26 | 27 | const reducer = (state, action) => { 28 | switch (action.type) { 29 | case "ADD_CONTACT": 30 | return { 31 | contacts: [...state.contacts, action.payload] 32 | }; 33 | case "DEL_CONTACT": 34 | return { 35 | contacts: state.contacts.filter(contact => contact.id !== action.payload) 36 | }; 37 | case "START": 38 | return { 39 | loading: true 40 | }; 41 | case "COMPLETE": 42 | return { 43 | loading: false 44 | }; 45 | default: 46 | throw new Error(); 47 | } 48 | }; 49 | 50 | export const ContactContextProvider = (props) => { 51 | const [state, dispatch] = useReducer(reducer, initialState); 52 | 53 | return ( 54 | 55 | {props.children} 56 | 57 | ) 58 | } 59 | -------------------------------------------------------------------------------- /src/context/counter-context.js: -------------------------------------------------------------------------------- 1 | import React, { useState, createContext } from "react"; 2 | 3 | // Create Context Object 4 | export const CounterContext = createContext(); 5 | 6 | 7 | // Create a provider for components to consume and subscribe to changes 8 | export const CounterContextProvider = (props) => { 9 | const [count, setCount] = useState(0); 10 | 11 | return ( 12 | 13 | {props.children} 14 | 15 | ) 16 | } 17 | -------------------------------------------------------------------------------- /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 'fomantic-ui-css/semantic.min.css'; 4 | import './index.css'; 5 | import App from './App'; 6 | import * as serviceWorker from './serviceWorker'; 7 | 8 | ReactDOM.render(, document.getElementById('root')); 9 | 10 | // If you want your app to work offline and load faster, you can change 11 | // unregister() to register() below. Note this comes with some pitfalls. 12 | // Learn more about service workers: https://bit.ly/CRA-PWA 13 | serviceWorker.unregister(); 14 | -------------------------------------------------------------------------------- /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.then(registration => { 134 | registration.unregister(); 135 | }); 136 | } 137 | } 138 | -------------------------------------------------------------------------------- /src/setupTests.js: -------------------------------------------------------------------------------- 1 | // jest-dom adds custom jest matchers for asserting on DOM nodes. 2 | // allows you to do things like: 3 | // expect(element).toHaveTextContent(/react/i) 4 | // learn more: https://github.com/testing-library/jest-dom 5 | import '@testing-library/jest-dom/extend-expect'; 6 | -------------------------------------------------------------------------------- /src/views/contact-view.js: -------------------------------------------------------------------------------- 1 | import React from "react"; 2 | import { Segment, Header } from "semantic-ui-react"; 3 | import ContactForm from "../components/contact-form"; 4 | import ContactTable from "../components/contact-table"; 5 | import { ContactContextProvider } from "../context/contact-context"; 6 | 7 | export default function Contacts() { 8 | return ( 9 | 10 | 11 |
Contacts
12 | 13 | 14 | 15 | 16 | ); 17 | } 18 | -------------------------------------------------------------------------------- /src/views/counter-view.js: -------------------------------------------------------------------------------- 1 | import React from "react"; 2 | import { Segment } from "semantic-ui-react"; 3 | 4 | import { CounterContextProvider } from '../context/counter-context'; 5 | import CounterDisplay from "../components/counter-display"; 6 | import CounterButtons from "../components/counter-buttons"; 7 | 8 | 9 | export default function CounterView() { 10 | return ( 11 | 12 |

Counter

13 | 14 | 15 | 16 | 17 | 18 | ); 19 | } 20 | --------------------------------------------------------------------------------