reducers

usereducer-starting-project/.eslintcache

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usereducer-starting-project/.prettierrc.json

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+{
+    "trailingComma": "es5",
+    "tabWidth": 4,
+    "semi": false,
+    "singleQuote": false
+  }

usereducer-starting-project/package.json

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+{
+  "name": "react-complete-guide",
+  "version": "0.1.0",
+  "private": true,
+  "dependencies": {
+    "@testing-library/jest-dom": "^5.11.6",
+    "@testing-library/react": "^11.2.2",
+    "@testing-library/user-event": "^12.5.0",
+    "react": "^18.0.0",
+    "react-dom": "^18.0.0",
+    "react-scripts": "4.0.1",
+    "web-vitals": "^0.2.4"
+  },
+  "scripts": {
+    "start": "react-scripts start",
+    "build": "react-scripts build",
+    "test": "react-scripts test",
+    "eject": "react-scripts eject"
+  },
+  "eslintConfig": {
+    "extends": [
+      "react-app",
+      "react-app/jest"
+    ]
+  },
+  "browserslist": {
+    "production": [
+      ">0.2%",
+      "not dead",
+      "not op_mini all"
+    ],
+    "development": [
+      "last 1 chrome version",
+      "last 1 firefox version",
+      "last 1 safari version"
+    ]
+  }
+}

usereducer-starting-project/public/index.html

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+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="utf-8" />
+    <link rel="icon" href="%PUBLIC_URL%/favicon.ico" />
+    <meta name="viewport" content="width=device-width, initial-scale=1" />
+    <meta name="theme-color" content="#000000" />
+    <meta
+      name="description"
+      content="Web site created using create-react-app"
+    />
+    <link rel="apple-touch-icon" href="%PUBLIC_URL%/logo192.png" />
+    <!--
+      manifest.json provides metadata used when your web app is installed on a
+      user's mobile device or desktop. See https://developers.google.com/web/fundamentals/web-app-manifest/
+    -->
+    <link rel="manifest" href="%PUBLIC_URL%/manifest.json" />
+    <!--
+      Notice the use of %PUBLIC_URL% in the tags above.
+      It will be replaced with the URL of the `public` folder during the build.
+      Only files inside the `public` folder can be referenced from the HTML.
+
+      Unlike "/favicon.ico" or "favicon.ico", "%PUBLIC_URL%/favicon.ico" will
+      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`.
+    -->
+    <title>React App</title>
+  </head>
+  <body>
+    <noscript>You need to enable JavaScript to run this app.</noscript>
+    <div id="root"></div>
+    <!--
+      This HTML file is a template.
+      If you open it directly in the browser, you will see an empty page.
+
+      You can add webfonts, meta tags, or analytics to this file.
+      The build step will place the bundled scripts into the <body> tag.
+
+      To begin the development, run `npm start` or `yarn start`.
+      To create a production bundle, use `npm run build` or `yarn build`.
+    -->
+  </body>
+</html>

usereducer-starting-project/public/manifest.json

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+{
+  "short_name": "React App",
+  "name": "Create React App Sample",
+  "icons": [
+    {
+      "src": "favicon.ico",
+      "sizes": "64x64 32x32 24x24 16x16",
+      "type": "image/x-icon"
+    },
+    {
+      "src": "logo192.png",
+      "type": "image/png",
+      "sizes": "192x192"
+    },
+    {
+      "src": "logo512.png",
+      "type": "image/png",
+      "sizes": "512x512"
+    }
+  ],
+  "start_url": ".",
+  "display": "standalone",
+  "theme_color": "#000000",
+  "background_color": "#ffffff"
+}

usereducer-starting-project/public/robots.txt

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+# https://www.robotstxt.org/robotstxt.html
+User-agent: *
+Disallow:

usereducer-starting-project/src/App.js

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+import React, { useState, useEffect } from 'react';
+
+import Login from './components/Login/Login';
+import Home from './components/Home/Home';
+import MainHeader from './components/MainHeader/MainHeader';
+
+function App() {
+  const [isLoggedIn, setIsLoggedIn] = useState(false);
+
+  useEffect(() => {
+    const storedUserLoggedInInformation = localStorage.getItem('isLoggedIn');
+
+    if (storedUserLoggedInInformation === '1') {
+      setIsLoggedIn(true);
+    }
+  }, []);
+
+  const loginHandler = (email, password) => {
+    // We should of course check email and password
+    // But it's just a dummy/ demo anyways
+    localStorage.setItem('isLoggedIn', '1');
+    setIsLoggedIn(true);
+  };
+
+  const logoutHandler = () => {
+    localStorage.removeItem('isLoggedIn');
+    setIsLoggedIn(false);
+  };
+
+  return (
+    <React.Fragment>
+      <MainHeader isAuthenticated={isLoggedIn} onLogout={logoutHandler} />
+      <main>
+        {!isLoggedIn && <Login onLogin={loginHandler} />}
+        {isLoggedIn && <Home onLogout={logoutHandler} />}
+      </main>
+    </React.Fragment>
+  );
+}
+
+export default App;

usereducer-starting-project/src/components/Home/Home.js

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+import React from 'react';
+
+import Card from '../UI/Card/Card';
+import classes from './Home.module.css';
+
+const Home = (props) => {
+  return (
+    <Card className={classes.home}>
+      <h1>Welcome back!</h1>
+    </Card>
+  );
+};
+
+export default Home;

usereducer-starting-project/src/components/Home/Home.module.css

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+.home {
+  width: 90%;
+  max-width: 40rem;
+  padding: 3rem;
+  margin: 2rem auto;
+  text-align: center;
+}

usereducer-starting-project/src/components/Login/Login.js

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+import React, { useState, useEffect, useReducer } from "react"
+
+import Card from "../UI/Card/Card"
+import classes from "./Login.module.css"
+import Button from "../UI/Button/Button"
+
+const emailReducer = (state, action) => {
+    if (action.type === "USER_INPUT") {
+        return { value: action.val, isValid: action.val.includes("@") }
+    }
+    if (action.type === "INPUT_BLUR") {
+        return { value: state.value, isValid: state.value.includes("@") }
+    }
+    return { value: "", isValid: false }
+}
+
+const passwordReducer = (state, action) => {
+    if (action.type === "USER_INPUT") {
+        return { value: action.val, isValid: action.val.trim().length > 6 }
+    }
+    if (action.type === "INPUT_BLUR") {
+        return { value: state.value, isValid: state.value.trim().length > 6 }
+    }
+    return { value: "", isValid: false }
+}
+
+const Login = (props) => {
+    const [formIsValid, setFormIsValid] = useState(false)
+
+    const [emailState, dispatchEmail] = useReducer(emailReducer, {
+        value: "",
+        isValid: false,
+    })
+
+    const [passwordState, dispatchPassword] = useReducer(passwordReducer, {
+        value: "",
+        isValid: false,
+    })
+
+    const {isValid: emailIsValid} = emailState;
+    const {isValid: passwordIsValid} = emailState;
+
+
+    useEffect(() => {
+        const identifier = setTimeout(() => {
+            setFormIsValid(emailIsValid && passwordIsValid)
+        }, 500)
+
+        return () => {
+            clearTimeout(identifier)
+        }
+    }, [emailIsValid, passwordIsValid])
+
+    const emailChangeHandler = (event) => {
+        dispatchEmail({ type: "USER_INPUT", val: event.target.value })
+
+        // setFormIsValid(event.target.value.includes("@") && passwordState.isValid)
+    }
+
+    const passwordChangeHandler = (event) => {
+        dispatchPassword({ type: "USER_INPUT", val: event.target.value })
+
+        // setFormIsValid(emailState.isValid && event.target.value.trim().length > 6)
+    }
+
+    const validateEmailHandler = () => {
+        dispatchEmail({ type: "INPUT_BLUR" })
+    }
+
+    const validatePasswordHandler = () => {
+        dispatchPassword({ type: "INPUT_BLUR" })
+    }
+
+    const submitHandler = (event) => {
+        event.preventDefault()
+        props.onLogin(emailState.value, passwordState.value)
+    }
+
+    return (
+        <Card className={classes.login}>
+            <form onSubmit={submitHandler}>
+                <div
+                    className={`${classes.control} ${
+                        !emailState.isValid ? classes.invalid : ""
+                    }`}
+                >
+                    <label htmlFor="email">E-Mail</label>
+                    <input
+                        type="email"
+                        id="email"
+                        value={emailState.value}
+                        onChange={emailChangeHandler}
+                        onBlur={validateEmailHandler}
+                    />
+                </div>
+                <div
+                    className={`${classes.control} ${
+                        !passwordState.isValid ? classes.invalid : ""
+                    }`}
+                >
+                    <label htmlFor="password">Password</label>
+                    <input
+                        type="password"
+                        id="password"
+                        value={passwordState.value}
+                        onChange={passwordChangeHandler}
+                        onBlur={validatePasswordHandler}
+                    />
+                </div>
+                <div className={classes.actions}>
+                    <Button
+                        type="submit"
+                        className={classes.btn}
+                        disabled={!formIsValid}
+                    >
+                        Login
+                    </Button>
+                </div>
+            </form>
+        </Card>
+    )
+}
+
+export default Login

usereducer-starting-project/src/components/Login/Login.module.css

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+.login {
+  width: 90%;
+  max-width: 40rem;
+  margin: 2rem auto;
+  padding: 2rem;
+}
+
+.control {
+  margin: 1rem 0;
+  display: flex;
+  align-items: stretch;
+  flex-direction: column;
+}
+
+.control label,
+.control input {
+  display: block;
+}
+
+.control label {
+  font-weight: bold;
+  flex: 1;
+  color: #464646;
+  margin-bottom: 0.5rem;
+}
+
+.control input {
+  flex: 3;
+  font: inherit;
+  padding: 0.35rem 0.35rem;
+  border-radius: 6px;
+  border: 1px solid #ccc;
+}
+
+.control input:focus {
+  outline: none;
+  border-color: #4f005f;
+  background: #f6dbfc;
+}
+
+.control.invalid input {
+  border-color: red;
+  background: #fbdada;
+}
+
+.actions {
+  text-align: center;
+}
+
+@media (min-width: 768px) {
+  .control {
+    align-items: center;
+    flex-direction: row;
+  }
+
+}

usereducer-starting-project/src/components/MainHeader/MainHeader.js

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+import React from 'react';
+
+import Navigation from './Navigation';
+import classes from './MainHeader.module.css';
+
+const MainHeader = (props) => {
+  return (
+    <header className={classes['main-header']}>
+      <h1>A Typical Page</h1>
+      <Navigation isLoggedIn={props.isAuthenticated} onLogout={props.onLogout} />
+    </header>
+  );
+};
+
+export default MainHeader;

usereducer-starting-project/src/components/MainHeader/MainHeader.module.css

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+.main-header {
+  position: fixed;
+  top: 0;
+  left: 0;
+  width: 100%;
+  height: 5rem;
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+  background: #741188;
+  padding: 0 2rem;
+}
+
+.main-header h1 {
+  color: white;
+}

usereducer-starting-project/src/components/MainHeader/Navigation.js

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+import React from 'react';
+
+import classes from './Navigation.module.css';
+
+const Navigation = (props) => {
+  return (
+    <nav className={classes.nav}>
+      <ul>
+        {props.isLoggedIn && (
+          <li>
+            <a href="/">Users</a>
+          </li>
+        )}
+        {props.isLoggedIn && (
+          <li>
+            <a href="/">Admin</a>
+          </li>
+        )}
+        {props.isLoggedIn && (
+          <li>
+            <button onClick={props.onLogout}>Logout</button>
+          </li>
+        )}
+      </ul>
+    </nav>
+  );
+};
+
+export default Navigation;

usereducer-starting-project/src/components/MainHeader/Navigation.module.css

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+.nav ul {
+  list-style: none;
+  margin: 0;
+  padding: 0;
+  display: flex;
+  align-items: center;
+}
+
+.nav li {
+  margin: 0;
+  margin-left: 2rem;
+}
+
+.nav a {
+  text-decoration: none;
+  color: white;
+}
+
+.nav a:hover,
+.nav a:active {
+  color: #f3cafb;
+}
+
+.nav button {
+  font: inherit;
+  background: #dd0db0;
+  border: 1px solid #dd0db0;
+  padding: 0.5rem 1.5rem;
+  color: white;
+  cursor: pointer;
+  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.26);
+  border-radius: 20px;
+}
+
+.nav button:focus {
+  outline: none;
+}
+
+.nav button:hover,
+.nav button:active {
+  color: #f3cafb;
+  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.26);
+}

usereducer-starting-project/src/components/UI/Button/Button.js

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+import React from 'react';
+
+import classes from './Button.module.css';
+
+const Button = (props) => {
+  return (
+    <button
+      type={props.type || 'button'}
+      className={`${classes.button} ${props.className}`}
+      onClick={props.onClick}
+      disabled={props.disabled}
+    >
+      {props.children}
+    </button>
+  );
+};
+
+export default Button;

usereducer-starting-project/src/components/UI/Button/Button.module.css

@@ -0,0 +1,30 @@
+.button {
+  font: inherit;
+  border: 1px solid #4f005f;
+  background: #4f005f;
+  color: white;
+  padding: 0.75rem 3.5rem;
+  cursor: pointer;
+  font-size: 1.15rem;
+  border-radius: 30px;
+}
+
+.button:hover,
+.button:active {
+  background: #741188;
+  border-color: #741188;
+}
+
+.button:focus {
+  outline: none;
+}
+
+button:disabled,
+button:focus:disabled,
+button:hover:disabled,
+button:active:disabled {
+  background: #ccc;
+  border-color: #ccc;
+  color: #666666;
+  cursor: not-allowed;
+}

usereducer-starting-project/src/components/UI/Card/Card.js

@@ -0,0 +1,11 @@
+import React from 'react';
+
+import classes from './Card.module.css';
+
+const Card = (props) => {
+  return (
+    <div className={`${classes.card} ${props.className}`}>{props.children}</div>
+  );
+};
+
+export default Card;

usereducer-starting-project/src/components/UI/Card/Card.module.css

@@ -0,0 +1,5 @@
+.card {
+  background: white;
+  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.26);
+  border-radius: 10px;
+}

usereducer-starting-project/src/index.css

@@ -0,0 +1,16 @@
+* {
+  box-sizing: border-box;
+}
+
+html {
+  font-family: sans-serif;
+  background: #fff;
+}
+
+body {
+  margin: 0;
+}
+
+main {
+  margin-top: 6rem;
+}

usereducer-starting-project/src/index.js

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+import React from 'react';
+import ReactDOM from 'react-dom/client';
+
+import './index.css';
+import App from './App';
+
+const root = ReactDOM.createRoot(document.getElementById('root'));
+root.render(<App />);