├── .gitignore ├── README.md ├── package.json ├── public ├── favicon.ico ├── index.html └── manifest.json ├── src ├── App.css ├── App.js ├── App.test.js ├── Form.css ├── Form.js ├── FormValidator.js ├── index.css ├── index.js ├── logo.svg └── registerServiceWorker.js └── yarn.lock /.gitignore: -------------------------------------------------------------------------------- 1 | # See https://help.github.com/ignore-files/ for more about ignoring files. 2 | 3 | # dependencies 4 | /node_modules 5 | 6 | # testing 7 | /coverage 8 | 9 | # production 10 | /build 11 | 12 | # misc 13 | .DS_Store 14 | .env.local 15 | .env.development.local 16 | .env.test.local 17 | .env.production.local 18 | 19 | npm-debug.log* 20 | yarn-debug.log* 21 | yarn-error.log* 22 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | This project was bootstrapped with [Create React App](https://github.com/facebookincubator/create-react-app). 2 | 3 | This is companion code to go along with my [blog post](https://medium.com/code-monkey/client-side-form-validation-in-react-40e367de47ba) 4 | 5 | ## Installation 6 | 7 | Clone the repository, run `yarn install`, then `yarn start` to start the server. 8 | 9 | ## Contributing 10 | 11 | Bug reports and pull requests are welcome on GitHub at https://github.com/mikeries/react-validation-tutorial. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the [Contributor Covenant](http://contributor-covenant.org) code of conduct. 12 | 13 | 14 | ## License 15 | 16 | The application is available as open source under the terms of the [MIT License](http://opensource.org/licenses/MIT). 17 | -------------------------------------------------------------------------------- /package.json: -------------------------------------------------------------------------------- 1 | { 2 | "name": "react-validation-tutorial", 3 | "version": "0.1.0", 4 | "private": true, 5 | "dependencies": { 6 | "bootstrap": "^3.3.7", 7 | "react": "^15.6.1", 8 | "react-bootstrap": "^0.31.3", 9 | "react-dom": "^15.6.1", 10 | "react-scripts": "1.0.13", 11 | "validator": "^8.1.0" 12 | }, 13 | "scripts": { 14 | "start": "react-scripts start", 15 | "build": "react-scripts build", 16 | "test": "react-scripts test --env=jsdom", 17 | "eject": "react-scripts eject" 18 | } 19 | } 20 | -------------------------------------------------------------------------------- /public/favicon.ico: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/mikeries/react-validation-tutorial/50661cc7ba08eeb2de4fb5809df0d1d1c24ba1c8/public/favicon.ico -------------------------------------------------------------------------------- /public/index.html: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 11 | 12 | 13 | 22 | React App 23 | 24 | 25 | 28 |
29 | 39 | 40 | 41 | -------------------------------------------------------------------------------- /public/manifest.json: -------------------------------------------------------------------------------- 1 | { 2 | "short_name": "React App", 3 | "name": "Create React App Sample", 4 | "icons": [ 5 | { 6 | "src": "favicon.ico", 7 | "sizes": "192x192", 8 | "type": "image/png" 9 | } 10 | ], 11 | "start_url": "./index.html", 12 | "display": "standalone", 13 | "theme_color": "#000000", 14 | "background_color": "#ffffff" 15 | } 16 | -------------------------------------------------------------------------------- /src/App.css: -------------------------------------------------------------------------------- 1 | .App { 2 | text-align: center; 3 | } 4 | 5 | .App-logo { 6 | animation: App-logo-spin infinite 20s linear; 7 | height: 80px; 8 | } 9 | 10 | .App-header { 11 | background-color: #222; 12 | height: 150px; 13 | padding: 20px; 14 | color: white; 15 | } 16 | 17 | .App-intro { 18 | font-size: large; 19 | } 20 | 21 | @keyframes App-logo-spin { 22 | from { transform: rotate(0deg); } 23 | to { transform: rotate(360deg); } 24 | } 25 | -------------------------------------------------------------------------------- /src/App.js: -------------------------------------------------------------------------------- 1 | import React, { Component } from 'react'; 2 | import logo from './logo.svg'; 3 | import './App.css'; 4 | import Form from './Form'; 5 | 6 | class App extends Component { 7 | render() { 8 | return ( 9 |
10 |
11 | logo 12 |

Welcome to React

13 |
14 |
15 |
16 | ); 17 | } 18 | } 19 | 20 | export default App; 21 | -------------------------------------------------------------------------------- /src/App.test.js: -------------------------------------------------------------------------------- 1 | import React from 'react'; 2 | import ReactDOM from 'react-dom'; 3 | import App from './App'; 4 | 5 | it('renders without crashing', () => { 6 | const div = document.createElement('div'); 7 | ReactDOM.render(, div); 8 | }); 9 | -------------------------------------------------------------------------------- /src/Form.css: -------------------------------------------------------------------------------- 1 | .demoForm { 2 | width: 500px; 3 | margin: auto; 4 | } -------------------------------------------------------------------------------- /src/Form.js: -------------------------------------------------------------------------------- 1 | import React, { Component } from 'react'; 2 | import './Form.css'; 3 | import FormValidator from './FormValidator'; 4 | 5 | class Form extends Component { 6 | constructor() { 7 | super(); 8 | 9 | this.validator = new FormValidator([ 10 | { 11 | field: 'email', 12 | method: 'isEmpty', 13 | validWhen: false, 14 | message: 'Email is required.' 15 | }, 16 | { 17 | field: 'email', 18 | method: 'isEmail', 19 | validWhen: true, 20 | message: 'That is not a valid email.' 21 | }, 22 | { 23 | field: 'phone', 24 | method: 'isEmpty', 25 | validWhen: false, 26 | message: 'Pleave provide a phone number.' 27 | }, 28 | { 29 | field: 'phone', 30 | method: 'matches', 31 | args: [/^\(?\d\d\d\)? ?\d\d\d-?\d\d\d\d$/], // args is an optional array of arguements that will be passed to the validation method 32 | validWhen: true, 33 | message: 'That is not a valid phone number.' 34 | }, 35 | { 36 | field: 'password', 37 | method: 'isEmpty', 38 | validWhen: false, 39 | message: 'Password is required.' 40 | }, 41 | { 42 | field: 'password_confirmation', 43 | method: 'isEmpty', 44 | validWhen: false, 45 | message: 'Password confirmation is required.' 46 | }, 47 | { 48 | field: 'password_confirmation', 49 | method: this.passwordMatch, // notice that we are passing a custom function here 50 | validWhen: true, 51 | message: 'Password and password confirmation do not match.' 52 | } 53 | ]); 54 | 55 | this.state = { 56 | email: '', 57 | phone: '', 58 | password: '', 59 | password_confirmation: '', 60 | validation: this.validator.valid(), 61 | } 62 | 63 | this.submitted = false; 64 | } 65 | 66 | passwordMatch = (confirmation, state) => (state.password === confirmation) 67 | 68 | handleInputChange = event => { 69 | event.preventDefault(); 70 | 71 | this.setState({ 72 | [event.target.name]: event.target.value, 73 | }); 74 | } 75 | 76 | handleFormSubmit = event => { 77 | event.preventDefault(); 78 | 79 | const validation = this.validator.validate(this.state); 80 | this.setState({ validation }); 81 | this.submitted = true; 82 | 83 | if (validation.isValid) { 84 | // handle actual form submission here 85 | } 86 | } 87 | 88 | render() { 89 | let validation = this.submitted ? // if the form has been submitted at least once 90 | this.validator.validate(this.state) : // then check validity every time we render 91 | this.state.validation // otherwise just use what's in state 92 | 93 | return ( 94 | 95 |

Sign up

96 | 97 |
98 | 99 | 104 | {validation.email.message} 105 |
106 | 107 |
108 | 109 | 114 | {validation.phone.message} 115 |
116 | 117 |
118 | 119 | 123 | {validation.password.message} 124 |
125 | 126 |
127 | 128 | 132 | {validation.password_confirmation.message} 133 |
134 | 135 | 138 | 139 | ) 140 | } 141 | } 142 | export default Form; -------------------------------------------------------------------------------- /src/FormValidator.js: -------------------------------------------------------------------------------- 1 | import validator from 'validator'; 2 | 3 | class FormValidator { 4 | constructor(validations) { 5 | // validations is an array of validation rules specific to a form 6 | this.validations = validations; 7 | } 8 | 9 | validate(state) { 10 | // start out assuming valid 11 | let validation = this.valid(); 12 | 13 | // for each validation rule 14 | this.validations.forEach(rule => { 15 | 16 | // if the field hasn't already been marked invalid by an earlier rule 17 | if (!validation[rule.field].isInvalid) { 18 | // determine the field value, the method to invoke and optional args from 19 | // the rule definition 20 | const field_value = state[rule.field].toString(); 21 | const args = rule.args || []; 22 | const validation_method = 23 | typeof rule.method === 'string' ? 24 | validator[rule.method] : 25 | rule.method 26 | 27 | // call the validation_method with the current field value as the first 28 | // argument, any additional arguments, and the whole state as a final 29 | // argument. If the result doesn't match the rule.validWhen property, 30 | // then modify the validation object for the field and set the isValid 31 | // field to false 32 | if(validation_method(field_value, ...args, state) !== rule.validWhen) { 33 | validation[rule.field] = { isInvalid: true, message: rule.message } 34 | validation.isValid = false; 35 | } 36 | } 37 | }); 38 | 39 | return validation; 40 | } 41 | 42 | valid() { 43 | const validation = {} 44 | 45 | this.validations.map(rule => ( 46 | validation[rule.field] = { isInvalid: false, message: '' } 47 | )); 48 | 49 | return { isValid: true, ...validation }; 50 | } 51 | } 52 | 53 | export default FormValidator; -------------------------------------------------------------------------------- /src/index.css: -------------------------------------------------------------------------------- 1 | body { 2 | margin: 0; 3 | padding: 0; 4 | font-family: sans-serif; 5 | } 6 | -------------------------------------------------------------------------------- /src/index.js: -------------------------------------------------------------------------------- 1 | import React from 'react'; 2 | import ReactDOM from 'react-dom'; 3 | import 'bootstrap/dist/css/bootstrap.css'; 4 | import 'bootstrap/dist/css/bootstrap-theme.css'; 5 | import './index.css'; 6 | import App from './App'; 7 | import registerServiceWorker from './registerServiceWorker'; 8 | 9 | ReactDOM.render(, document.getElementById('root')); 10 | registerServiceWorker(); 11 | -------------------------------------------------------------------------------- /src/logo.svg: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | -------------------------------------------------------------------------------- /src/registerServiceWorker.js: -------------------------------------------------------------------------------- 1 | // In production, we register a service worker to serve assets from local cache. 2 | 3 | // This lets the app load faster on subsequent visits in production, and gives 4 | // it offline capabilities. However, it also means that developers (and users) 5 | // will only see deployed updates on the "N+1" visit to a page, since previously 6 | // cached resources are updated in the background. 7 | 8 | // To learn more about the benefits of this model, read https://goo.gl/KwvDNy. 9 | // This link also includes instructions on opting out of this behavior. 10 | 11 | const isLocalhost = Boolean( 12 | window.location.hostname === 'localhost' || 13 | // [::1] is the IPv6 localhost address. 14 | window.location.hostname === '[::1]' || 15 | // 127.0.0.1/8 is considered localhost for IPv4. 16 | window.location.hostname.match( 17 | /^127(?:\.(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)){3}$/ 18 | ) 19 | ); 20 | 21 | export default function register() { 22 | if (process.env.NODE_ENV === 'production' && 'serviceWorker' in navigator) { 23 | // The URL constructor is available in all browsers that support SW. 24 | const publicUrl = new URL(process.env.PUBLIC_URL, window.location); 25 | if (publicUrl.origin !== window.location.origin) { 26 | // Our service worker won't work if PUBLIC_URL is on a different origin 27 | // from what our page is served on. This might happen if a CDN is used to 28 | // serve assets; see https://github.com/facebookincubator/create-react-app/issues/2374 29 | return; 30 | } 31 | 32 | window.addEventListener('load', () => { 33 | const swUrl = `${process.env.PUBLIC_URL}/service-worker.js`; 34 | 35 | if (!isLocalhost) { 36 | // Is not local host. Just register service worker 37 | registerValidSW(swUrl); 38 | } else { 39 | // This is running on localhost. Lets check if a service worker still exists or not. 40 | checkValidServiceWorker(swUrl); 41 | } 42 | }); 43 | } 44 | } 45 | 46 | function registerValidSW(swUrl) { 47 | navigator.serviceWorker 48 | .register(swUrl) 49 | .then(registration => { 50 | registration.onupdatefound = () => { 51 | const installingWorker = registration.installing; 52 | installingWorker.onstatechange = () => { 53 | if (installingWorker.state === 'installed') { 54 | if (navigator.serviceWorker.controller) { 55 | // At this point, the old content will have been purged and 56 | // the fresh content will have been added to the cache. 57 | // It's the perfect time to display a "New content is 58 | // available; please refresh." message in your web app. 59 | console.log('New content is available; please refresh.'); 60 | } else { 61 | // At this point, everything has been precached. 62 | // It's the perfect time to display a 63 | // "Content is cached for offline use." message. 64 | console.log('Content is cached for offline use.'); 65 | } 66 | } 67 | }; 68 | }; 69 | }) 70 | .catch(error => { 71 | console.error('Error during service worker registration:', error); 72 | }); 73 | } 74 | 75 | function checkValidServiceWorker(swUrl) { 76 | // Check if the service worker can be found. If it can't reload the page. 77 | fetch(swUrl) 78 | .then(response => { 79 | // Ensure service worker exists, and that we really are getting a JS file. 80 | if ( 81 | response.status === 404 || 82 | response.headers.get('content-type').indexOf('javascript') === -1 83 | ) { 84 | // No service worker found. Probably a different app. Reload the page. 85 | navigator.serviceWorker.ready.then(registration => { 86 | registration.unregister().then(() => { 87 | window.location.reload(); 88 | }); 89 | }); 90 | } else { 91 | // Service worker found. Proceed as normal. 92 | registerValidSW(swUrl); 93 | } 94 | }) 95 | .catch(() => { 96 | console.log( 97 | 'No internet connection found. App is running in offline mode.' 98 | ); 99 | }); 100 | } 101 | 102 | export function unregister() { 103 | if ('serviceWorker' in navigator) { 104 | navigator.serviceWorker.ready.then(registration => { 105 | registration.unregister(); 106 | }); 107 | } 108 | } 109 | --------------------------------------------------------------------------------