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‎README.md

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## Form Validation using Custom React Hooks
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The full tutorial for building this project can be found over at Upmostly.com: [Form Validation Using Custom React Hooks](https://upmostly.com/tutorials/form-validation-using-custom-react-hooks).
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![A login form built in React and using custom React Hooks to power the form validation](https://upmostly.com/wp-content/uploads/react-hooks-form-validation.gif)

‎package.json

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{
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"name": "form-validation-react-hooks",
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"version": "0.1.0",
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"private": true,
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"dependencies": {
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"bulma": "^0.7.4",
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"react": "^16.8.2",
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"react-dom": "^16.8.2",
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"react-scripts": "2.1.5"
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},
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"scripts": {
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"start": "react-scripts start",
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"build": "react-scripts build",
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"test": "react-scripts test",
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"eject": "react-scripts eject"
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},
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"eslintConfig": {
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"extends": "react-app"
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},
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"browserslist": [
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">0.2%",
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"not dead",
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"not ie <= 11",
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"not op_mini all"
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]
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}

‎public/favicon.ico

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‎public/index.html

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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="utf-8" />
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<link rel="shortcut icon" href="%PUBLIC_URL%/favicon.ico" />
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<meta
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name="viewport"
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content="width=device-width, initial-scale=1, shrink-to-fit=no"
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/>
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<meta name="theme-color" content="#000000" />
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<!--
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manifest.json provides metadata used when your web app is installed on a
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user's mobile device or desktop. See https://developers.google.com/web/fundamentals/web-app-manifest/
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-->
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<link rel="manifest" href="%PUBLIC_URL%/manifest.json" />
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<!--
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Notice the use of %PUBLIC_URL% in the tags above.
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It will be replaced with the URL of the `public` folder during the build.
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Only files inside the `public` folder can be referenced from the HTML.
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Unlike "/favicon.ico" or "favicon.ico", "%PUBLIC_URL%/favicon.ico" will
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work correctly both with client-side routing and a non-root public URL.
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Learn how to configure a non-root public URL by running `npm run build`.
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-->
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<title>React App</title>
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</head>
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<body>
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<noscript>You need to enable JavaScript to run this app.</noscript>
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<div id="root"></div>
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<!--
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This HTML file is a template.
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If you open it directly in the browser, you will see an empty page.
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You can add webfonts, meta tags, or analytics to this file.
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The build step will place the bundled scripts into the <body> tag.
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To begin the development, run `npm start` or `yarn start`.
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To create a production bundle, use `npm run build` or `yarn build`.
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-->
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</body>
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</html>

‎public/manifest.json

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{
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"short_name": "React App",
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"name": "Create React App Sample",
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"icons": [
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{
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"src": "favicon.ico",
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"sizes": "64x64 32x32 24x24 16x16",
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"type": "image/x-icon"
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}
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],
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"start_url": ".",
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"display": "standalone",
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"theme_color": "#000000",
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"background_color": "#ffffff"
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}

‎src/App.js

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import React from 'react';
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import Form from './Form';
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const App = () => {
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return (
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<Form />
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);
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};
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export default App;

‎src/Form.js

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import React from 'react';
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import useForm from "./useForm";
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import validate from './LoginFormValidationRules';
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const Form = () => {
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const {
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values,
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errors,
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handleChange,
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handleSubmit,
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} = useForm(login, validate);
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function login() {
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console.log('No errors, submit callback called!');
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}
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return (
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<div className="section is-fullheight">
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<div className="container">
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<div className="column is-4 is-offset-4">
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<div className="box">
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<form onSubmit={handleSubmit} noValidate>
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<div className="field">
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<label className="label">Email Address</label>
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<div className="control">
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<input autoComplete="off" className={`input ${errors.email && 'is-danger'}`} type="email" name="email" onChange={handleChange} value={values.email || ''} required />
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{errors.email && (
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<p className="help is-danger">{errors.email}</p>
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)}
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</div>
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</div>
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<div className="field">
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<label className="label">Password</label>
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<div className="control">
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<input className={`input ${errors.password && 'is-danger'}`} type="password" name="password" onChange={handleChange} value={values.password || ''} required />
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</div>
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{errors.password && (
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<p className="help is-danger">{errors.password}</p>
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)}
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</div>
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<button type="submit" className="button is-block is-info is-fullwidth">Login</button>
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</form>
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</div>
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</div>
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</div>
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</div>
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);
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};
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export default Form;

‎src/LoginFormValidationRules.js

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export default function validate(values) {
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let errors = {};
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if (!values.email) {
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errors.email = 'Email address is required';
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} else if (!/\S+@\S+\.\S+/.test(values.email)) {
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errors.email = 'Email address is invalid';
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}
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if (!values.password) {
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errors.password = 'Password is required';
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} else if (values.password.length < 8) {
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errors.password = 'Password must be 8 or more characters';
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}
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return errors;
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};

‎src/index.css

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body {
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margin: 0;
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padding: 0;
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font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Oxygen",
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"Ubuntu", "Cantarell", "Fira Sans", "Droid Sans", "Helvetica Neue",
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sans-serif;
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-webkit-font-smoothing: antialiased;
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-moz-osx-font-smoothing: grayscale;
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}
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code {
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font-family: source-code-pro, Menlo, Monaco, Consolas, "Courier New",
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monospace;
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}

‎src/index.js

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import React from 'react';
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import ReactDOM from 'react-dom';
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import './index.css';
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import App from './App';
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import * as serviceWorker from './serviceWorker';
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import 'bulma/css/bulma.css';
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ReactDOM.render(<App />, document.getElementById('root'));
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// If you want your app to work offline and load faster, you can change
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// unregister() to register() below. Note this comes with some pitfalls.
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// Learn more about service workers: http://bit.ly/CRA-PWA
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serviceWorker.unregister();

‎src/serviceWorker.js

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// This optional code is used to register a service worker.
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// register() is not called by default.
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// This lets the app load faster on subsequent visits in production, and gives
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// it offline capabilities. However, it also means that developers (and users)
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// will only see deployed updates on subsequent visits to a page, after all the
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// existing tabs open on the page have been closed, since previously cached
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// resources are updated in the background.
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// To learn more about the benefits of this model and instructions on how to
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// opt-in, read http://bit.ly/CRA-PWA
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const isLocalhost = Boolean(
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window.location.hostname === 'localhost' ||
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// [::1] is the IPv6 localhost address.
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window.location.hostname === '[::1]' ||
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// 127.0.0.1/8 is considered localhost for IPv4.
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window.location.hostname.match(
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/^127(?:\.(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)){3}$/
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)
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);
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export function register(config) {
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if (process.env.NODE_ENV === 'production' && 'serviceWorker' in navigator) {
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// The URL constructor is available in all browsers that support SW.
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const publicUrl = new URL(process.env.PUBLIC_URL, window.location.href);
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if (publicUrl.origin !== window.location.origin) {
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// Our service worker won't work if PUBLIC_URL is on a different origin
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// from what our page is served on. This might happen if a CDN is used to
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// serve assets; see https://github.com/facebook/create-react-app/issues/2374
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return;
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}
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window.addEventListener('load', () => {
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const swUrl = `${process.env.PUBLIC_URL}/service-worker.js`;
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if (isLocalhost) {
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// This is running on localhost. Let's check if a service worker still exists or not.
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checkValidServiceWorker(swUrl, config);
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// Add some additional logging to localhost, pointing developers to the
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// service worker/PWA documentation.
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navigator.serviceWorker.ready.then(() => {
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console.log(
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'This web app is being served cache-first by a service ' +
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'worker. To learn more, visit http://bit.ly/CRA-PWA'
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);
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});
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} else {
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// Is not localhost. Just register service worker
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registerValidSW(swUrl, config);
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}
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});
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}
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}
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function registerValidSW(swUrl, config) {
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navigator.serviceWorker
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.register(swUrl)
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.then(registration => {
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registration.onupdatefound = () => {
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const installingWorker = registration.installing;
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if (installingWorker == null) {
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return;
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}
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installingWorker.onstatechange = () => {
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if (installingWorker.state === 'installed') {
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if (navigator.serviceWorker.controller) {
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// At this point, the updated precached content has been fetched,
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// but the previous service worker will still serve the older
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// content until all client tabs are closed.
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console.log(
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'New content is available and will be used when all ' +
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'tabs for this page are closed. See http://bit.ly/CRA-PWA.'
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);
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// Execute callback
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if (config && config.onUpdate) {
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config.onUpdate(registration);
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}
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} else {
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// At this point, everything has been precached.
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// It's the perfect time to display a
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// "Content is cached for offline use." message.
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console.log('Content is cached for offline use.');
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// Execute callback
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if (config && config.onSuccess) {
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config.onSuccess(registration);
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}
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}
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}
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};
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};
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})
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.catch(error => {
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console.error('Error during service worker registration:', error);
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});
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}
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function checkValidServiceWorker(swUrl, config) {
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// Check if the service worker can be found. If it can't reload the page.
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fetch(swUrl)
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.then(response => {
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// Ensure service worker exists, and that we really are getting a JS file.
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const contentType = response.headers.get('content-type');
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if (
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response.status === 404 ||
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(contentType != null && contentType.indexOf('javascript') === -1)
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) {
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// No service worker found. Probably a different app. Reload the page.
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navigator.serviceWorker.ready.then(registration => {
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registration.unregister().then(() => {
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window.location.reload();
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});
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});
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} else {
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// Service worker found. Proceed as normal.
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registerValidSW(swUrl, config);
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}
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})
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.catch(() => {
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console.log(
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'No internet connection found. App is running in offline mode.'
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);
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});
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}
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export function unregister() {
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if ('serviceWorker' in navigator) {
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navigator.serviceWorker.ready.then(registration => {
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registration.unregister();
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});
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}
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}

‎src/useForm.js

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import { useState, useEffect } from 'react';
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const useForm = (callback, validate) => {
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const [values, setValues] = useState({});
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const [errors, setErrors] = useState({});
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const [isSubmitting, setIsSubmitting] = useState(false);
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useEffect(() => {
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if (Object.keys(errors).length === 0 && isSubmitting) {
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callback();
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}
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}, [errors]);
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const handleSubmit = (event) => {
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if (event) event.preventDefault();
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setErrors(validate(values));
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setIsSubmitting(true);
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};
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const handleChange = (event) => {
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event.persist();
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setValues(values => ({ ...values, [event.target.name]: event.target.value }));
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};
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return {
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handleChange,
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handleSubmit,
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values,
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errors,
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}
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};
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export default useForm;

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