update,

COMP3322A-Lab-7-React/code/Dockerfile

@@ -0,0 +1,3 @@
+# CREDIT: https://github.com/shren207/nextjs-docker-compose
+# Dockerfile
+FROM node:16-buster

COMP3322A-Lab-7-React/code/docker-compose.yml

@@ -0,0 +1,14 @@
+# CREDIT: https://github.com/shren207/nextjs-docker-compose
+version: '3.8'
+
+services:
+  react:
+    build: .
+    ports:
+      - '8082:3000'
+    restart: always
+    user: 1000:1000
+    working_dir: /app
+    volumes:
+      - $PWD:/app
+    command: sleep infinity

COMP3322A-Lab-7-React/code/entry.sh

@@ -0,0 +1,8 @@
+#!/usr/bin/env bash
+
+set -ex
+
+pushd myreactapp
+  npm i -d
+
+  npm start

COMP3322A-Lab-7-React/code/init-react.sh

@@ -0,0 +1,14 @@
+#!/usr/bin/env bash
+
+
+rm -rf myreactapp
+
+set -ex
+
+npx create-react-app myreactapp
+
+pushd myreactapp
+  npm i -d
+  npm start
+
+popd

COMP3322A-Lab-7-React/code/myreactapp/.gitignore

@@ -0,0 +1,23 @@
+# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
+
+# dependencies
+/node_modules
+/.pnp
+.pnp.js
+
+# testing
+/coverage
+
+# production
+/build
+
+# misc
+.DS_Store
+.env.local
+.env.development.local
+.env.test.local
+.env.production.local
+
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*

COMP3322A-Lab-7-React/code/myreactapp/README.md

@@ -0,0 +1,70 @@
+# Getting Started with Create React App
+
+This project was bootstrapped with [Create React App](https://github.com/facebook/create-react-app).
+
+## Available Scripts
+
+In the project directory, you can run:
+
+### `npm start`
+
+Runs the app in the development mode.\
+Open [http://localhost:3000](http://localhost:3000) to view it in your browser.
+
+The page will reload when you make changes.\
+You may also see any lint errors in the console.
+
+### `npm test`
+
+Launches the test runner in the interactive watch mode.\
+See the section about [running tests](https://facebook.github.io/create-react-app/docs/running-tests) for more information.
+
+### `npm run build`
+
+Builds the app for production to the `build` folder.\
+It correctly bundles React in production mode and optimizes the build for the best performance.
+
+The build is minified and the filenames include the hashes.\
+Your app is ready to be deployed!
+
+See the section about [deployment](https://facebook.github.io/create-react-app/docs/deployment) for more information.
+
+### `npm run eject`
+
+**Note: this is a one-way operation. Once you `eject`, you can't go back!**
+
+If you aren't satisfied with the build tool and configuration choices, you can `eject` at any time. This command will remove the single build dependency from your project.
+
+Instead, it will copy all the configuration files and the transitive dependencies (webpack, Babel, ESLint, etc) right into your project so you have full control over them. All of the commands except `eject` will still work, but they will point to the copied scripts so you can tweak them. At this point you're on your own.
+
+You don't have to ever use `eject`. The curated feature set is suitable for small and middle deployments, and you shouldn't feel obligated to use this feature. However we understand that this tool wouldn't be useful if you couldn't customize it when you are ready for it.
+
+## Learn More
+
+You can learn more in the [Create React App documentation](https://facebook.github.io/create-react-app/docs/getting-started).
+
+To learn React, check out the [React documentation](https://reactjs.org/).
+
+### Code Splitting
+
+This section has moved here: [https://facebook.github.io/create-react-app/docs/code-splitting](https://facebook.github.io/create-react-app/docs/code-splitting)
+
+### Analyzing the Bundle Size
+
+This section has moved here: [https://facebook.github.io/create-react-app/docs/analyzing-the-bundle-size](https://facebook.github.io/create-react-app/docs/analyzing-the-bundle-size)
+
+### Making a Progressive Web App
+
+This section has moved here: [https://facebook.github.io/create-react-app/docs/making-a-progressive-web-app](https://facebook.github.io/create-react-app/docs/making-a-progressive-web-app)
+
+### Advanced Configuration
+
+This section has moved here: [https://facebook.github.io/create-react-app/docs/advanced-configuration](https://facebook.github.io/create-react-app/docs/advanced-configuration)
+
+### Deployment
+
+This section has moved here: [https://facebook.github.io/create-react-app/docs/deployment](https://facebook.github.io/create-react-app/docs/deployment)
+
+### `npm run build` fails to minify
+
+This section has moved here: [https://facebook.github.io/create-react-app/docs/troubleshooting#npm-run-build-fails-to-minify](https://facebook.github.io/create-react-app/docs/troubleshooting#npm-run-build-fails-to-minify)

COMP3322A-Lab-7-React/code/myreactapp/package.json

@@ -0,0 +1,38 @@
+{
+  "name": "myreactapp",
+  "version": "0.1.0",
+  "private": true,
+  "dependencies": {
+    "@testing-library/jest-dom": "^5.16.5",
+    "@testing-library/react": "^13.4.0",
+    "@testing-library/user-event": "^13.5.0",
+    "react": "^18.2.0",
+    "react-dom": "^18.2.0",
+    "react-scripts": "5.0.1",
+    "web-vitals": "^2.1.4"
+  },
+  "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"
+    ]
+  }
+}

COMP3322A-Lab-7-React/code/myreactapp/public/index.html

@@ -0,0 +1,43 @@
+<!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>

COMP3322A-Lab-7-React/code/myreactapp/public/manifest.json

@@ -0,0 +1,25 @@
+{
+  "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"
+}

COMP3322A-Lab-7-React/code/myreactapp/public/robots.txt

@@ -0,0 +1,3 @@
+# https://www.robotstxt.org/robotstxt.html
+User-agent: *
+Disallow:

COMP3322A-Lab-7-React/code/myreactapp/src/App.css

@@ -0,0 +1,38 @@
+.App {
+  text-align: center;
+}
+
+.App-logo {
+  height: 40vmin;
+  pointer-events: none;
+}
+
+@media (prefers-reduced-motion: no-preference) {
+  .App-logo {
+    animation: App-logo-spin infinite 20s linear;
+  }
+}
+
+.App-header {
+  background-color: #282c34;
+  min-height: 100vh;
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  justify-content: center;
+  font-size: calc(10px + 2vmin);
+  color: white;
+}
+
+.App-link {
+  color: #61dafb;
+}
+
+@keyframes App-logo-spin {
+  from {
+    transform: rotate(0deg);
+  }
+  to {
+    transform: rotate(360deg);
+  }
+}

COMP3322A-Lab-7-React/code/myreactapp/src/App.js

@@ -0,0 +1,231 @@
+import React from "react";
+
+// 4.2. Go to class LoginButton. In its render() function, we are rendering a login button with the
+// handler function this.handleClick bound to the onclick event. Implement the function
+// handleClick(): If the input username and password are valid, use
+// this.props.handleStatusChange(xx, yy) received from class Lab7App to update the state
+// variables of Lab7App, where xx equals “true” and yy equals this.props.username received from
+// class Lab7App; otherwise, alert the message “Login failed!” Hint: you can use the provided
+// function checkValid() to check if the input username and password are valid, which returns true
+// if the inputs are included in the predefined array userDB, and returns false, otherwise. Read more
+// about the array find() function at https://developer.mozilla.org/en-
+// US/docs/Web/JavaScript/Reference/Global_Objects/Array/find
+
+class LoginButton extends React.Component {
+  constructor(props) {
+    super(props);
+    this.handleClick = this.handleClick.bind(this);
+    this.checkValid = this.checkValid.bind(this);
+  }
+
+  checkValid() {
+    let item = userDB.find((item) => {
+      return item.username == this.props.username && item.password == this.props.password;
+    });
+    if (item != undefined) return true;
+    else return false;
+  }
+
+  // step 4.2
+  handleClick() {
+    if (this.checkValid()) {
+      this.props.handleStatusChange(true, this.props.username);
+    } else {
+      // otherwise, alert the message “Login failed!”
+      alert("Login failed!");
+    }
+  }
+
+  render() {
+    return <button onClick={() => this.handleClick()}>Login</button>;
+  }
+}
+
+class Contents extends React.Component {
+  constructor(props) {
+    super(props);
+    this.state = {
+      topics: topicsDB,
+    };
+    this.handleTopicsChange = this.handleTopicsChange.bind(this);
+  }
+
+  // step 7
+  // Step 7. Implement filtering of topics list
+  // Now implement the function handleTopicsChange() in class Contents as follows: if value of the
+  // argument option is not “all” (i.e., it is one of the three sections instead), apply filter() function on
+  // topicsDB to obtain a filtered topics array where each topic’s section is option (learn more about
+  // JavaScript Array filter method at https://developer.mozilla.org/en-
+  // US/docs/Web/JavaScript/Reference/Global_Objects/Array/filter), and set the state variable
+  // Topics to be the filtered array; otherwise, set the state variable Topics to be topicsDB. Note that
+  // you need to use this.setState() to change a state variable’s value.
+  handleTopicsChange(option) {
+    if (option == "all") {
+      this.setState({ topics: topicsDB });
+    } else {
+      this.setState({ topics: topicsDB.filter((o) => o.section == option) });
+    }
+  }
+
+  render() {
+    const topics = this.state.topics;
+    return (
+      <div id="contents">
+        <DropDownList handleTopicsChange={this.handleTopicsChange} />
+        {
+          // Step 5. Render topics list in class component Contents
+          // Go to class Contents, which has a state of one key-value pair: topics stores the list of topics to be
+          // shown on the page, initialized using the given array topicsDB. Complete the render() function of
+          // class Contents: within { }, apply map() function on topics to create a number of <p> elements,
+          // each presenting information of one topic in the topics array as <p>Section: {topic.section}; Topic
+          // Name: {topic.topic}</p>. The handler function handleTopicsChange() is to change the state
+          // variable topics upon selecting a different option in the drop-down list (to be implemented later).
+
+          topics.map((topic) => {
+            return (
+              <>
+                <p>
+                  Section: {topic.section}; Name: {topic.topic}
+                </p>
+              </>
+            );
+          })
+        }
+      </div>
+    );
+  }
+}
+
+function DropDownList(props) {
+  var key_pool = {};
+  const getUniq = (value_in) => {
+    if (key_pool[value_in] != undefined) return false;
+
+    key_pool[value_in] = "";
+    return true;
+  };
+  return (
+    <div>
+      <b>Choose one section: </b>
+
+      {
+        // Step 6. Render a drop-down list in function component DropDownList
+        // Now go to function DropDownList, which receives the handler function handleTopicsChange of
+        // class Contents in its props. Complete its render() function as follows: remove "{/* step 6*/}", and
+        // in its place, create a drop-down list using the <select> element with four options (with values
+        // “all”, “section-1”, “section-2” and “section-3”, respectively). The option “all” should be
+        // associated with the attribute “selected” as the default option. Add an event handler function to
+        // onChange event on the <select> element (to track the change of selected option and update
+        // topics list accordingly), which should be e => props.handleTopicsChange(e.target.value).
+      }
+      <></>
+      {
+        <select onChange={(e) => props.handleTopicsChange(e.target.value)}>
+          <option selected value="all">
+            all
+          </option>
+          {
+            // topicsDB
+            //  get unique by section
+            //  extract section
+            //  sort before exit
+          }
+          {topicsDB
+            .filter((t) => getUniq(t.section))
+            .map((ut) => ut.section)
+            .sort()
+            .map((ts) => (
+              <option value={ts}>{ts}</option>
+            ))}
+        </select>
+      }
+    </div>
+  );
+}
+
+class Lab7App extends React.Component {
+  constructor(props) {
+    super(props);
+    this.state = {
+      isLogin: false,
+      loginName: "",
+      inputUserName: "",
+      inputUserPswd: "",
+    };
+    this.handleInputChange = this.handleInputChange.bind(this);
+    this.handleStatusChange = this.handleStatusChange.bind(this);
+  }
+
+  // step 3
+  handleInputChange(event) {
+    let target = event.target;
+    let name = target.name;
+    let value = target.value;
+    this.setState({ [name]: value });
+  }
+
+  handleStatusChange(newStatus, loginName) {
+    const isUserLoggedIn = (login_status) => login_status == true;
+
+    if (isUserLoggedIn(newStatus)) {
+      this.setState({ isLogin: newStatus, loginName: loginName });
+    } else {
+      this.setState({ isLogin: newStatus, loginName: loginName, inputUserName: "", inputUserPswd: "" });
+    }
+  }
+
+  render() {
+    if (!this.state.isLogin) {
+      return (
+        <div>
+          <p>Fill in username and password and click the button to log in</p>
+          <input type="text" name="inputUserName" placeholder="username" value={this.state.inputUserName} onChange={(e) => this.handleInputChange(e)} />
+          <input type="password" name="inputUserPswd" placeholder="password" value={this.state.inputUserPswd} onChange={(e) => this.handleInputChange(e)} />
+
+          {
+            // 4.1. In the render() function of Lab7App, render the
+            //   LoginButton component. The LoginButton component receives three props:
+            //   1. username: which equals the value of state variable inputUserName;
+            //   2. password: which equals the value of state variable inputUserPswd;
+            //   3. handleStatusChange: which equals this.handleStatusChange. We have provided the
+            //   implementation of function handleStatusChange(), which receives the login status (boolean
+            //   type) and the name of the logged-in user (string type) as arguments, and set the state
+            //   variables isLogin and loginName to the argument values, respectively. 
+          }
+
+          <LoginButton username={this.state.inputUserName} password={this.state.inputUserPswd} handleStatusChange={this.handleStatusChange} />
+        </div>
+      );
+    } else {
+      return (
+        <div>
+          <p>Welcome {this.state.loginName}!</p>
+          <button onClick={() => this.handleStatusChange(false, "")}>Logout</button>
+          {/* 4.3. Go to class Lab7App. In the render() function, add an onClick event handler to the logout button, which is an
+          arrow function ()=>this.handleStatusChange() where handleStatusChange() receives a “false” value and an empty string as arguments. */}
+          <Contents />
+        </div>
+      );
+    }
+  }
+}
+
+const userDB = [
+  { username: "Alex", password: "123" },
+  { username: "Bob", password: "231" },
+  { username: "Jack", password: "321" },
+];
+
+const topicsDB = [
+  { section: "section-1", topic: "CSS" },
+  { section: "section-1", topic: "HTML" },
+  { section: "section-1", topic: "WWW" },
+  { section: "section-2", topic: "JaveScript" },
+  { section: "section-2", topic: "MongoDB" },
+  { section: "section-2", topic: "NodeJS" },
+  { section: "section-3", topic: "JQuery" },
+  { section: "section-3", topic: "React" },
+  { section: "section-3", topic: "Vue" },
+];
+
+export default Lab7App;

COMP3322A-Lab-7-React/code/myreactapp/src/App.test.js

@@ -0,0 +1,8 @@
+import { render, screen } from '@testing-library/react';
+import App from './App';
+
+test('renders learn react link', () => {
+  render(<App />);
+  const linkElement = screen.getByText(/learn react/i);
+  expect(linkElement).toBeInTheDocument();
+});

COMP3322A-Lab-7-React/code/myreactapp/src/index.css

@@ -0,0 +1,23 @@
+body {
+  margin: 0;
+  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
+    'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue',
+    sans-serif;
+  -webkit-font-smoothing: antialiased;
+  -moz-osx-font-smoothing: grayscale;
+}
+
+code {
+  font-family: source-code-pro, Menlo, Monaco, Consolas, 'Courier New',
+    monospace;
+}
+
+#root{
+  text-align: center;
+}
+
+#contents{
+  text-align: left;
+  margin-left: 40%;
+  margin-top: 2em;
+}

COMP3322A-Lab-7-React/code/myreactapp/src/index.js

@@ -0,0 +1,17 @@
+import React from "react";
+import ReactDOM from "react-dom/client";
+import "./index.css";
+import Lab7App from "./App";
+import reportWebVitals from "./reportWebVitals";
+
+const root = ReactDOM.createRoot(document.getElementById("root"));
+root.render(
+  <React.StrictMode>
+    <Lab7App />
+  </React.StrictMode>
+);
+
+// If you want to start measuring performance in your app, pass a function
+// to log results (for example: reportWebVitals(console.log))
+// or send to an analytics endpoint. Learn more: https://bit.ly/CRA-vitals
+reportWebVitals();

COMP3322A-Lab-7-React/code/myreactapp/src/logo.svg

@@ -0,0 +1 @@
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COMP3322A-Lab-7-React/code/myreactapp/src/reportWebVitals.js

@@ -0,0 +1,13 @@
+const reportWebVitals = onPerfEntry => {
+  if (onPerfEntry && onPerfEntry instanceof Function) {
+    import('web-vitals').then(({ getCLS, getFID, getFCP, getLCP, getTTFB }) => {
+      getCLS(onPerfEntry);
+      getFID(onPerfEntry);
+      getFCP(onPerfEntry);
+      getLCP(onPerfEntry);
+      getTTFB(onPerfEntry);
+    });
+  }
+};
+
+export default reportWebVitals;

COMP3322A-Lab-7-React/code/myreactapp/src/setupTests.js

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+// jest-dom adds custom jest matchers for asserting on DOM nodes.
+// allows you to do things like:
+// expect(element).toHaveTextContent(/react/i)
+// learn more: https://github.com/testing-library/jest-dom
+import '@testing-library/jest-dom';

COMP3322A-Lab-7-React/code/package.json

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+{
+  "name": "react-helloworld-tryout",
+  "version": "0.1.0",
+  "private": true,
+  "dependencies": {
+    "@testing-library/jest-dom": "^4.2.4",
+    "@testing-library/react": "^9.3.2",
+    "@testing-library/user-event": "^7.1.2",
+    "react": "^16.14.0",
+    "react-dom": "^16.14.0",
+    "react-scripts": "4.0.3",
+    "web-vitals": "^1.0.1"
+  },
+  "scripts": {
+    "start": "react-scripts start",
+    "build": "react-scripts build",
+    "test": "react-scripts test",
+    "test_coverage": "yarn test -- --coverage",
+    "screenshot": "yarn test",
+    "test:dev": "react-scripts test --maxWorkers=1 --notify --coverage --watchAll=false",
+    "eject": "react-scripts eject",
+    "prettier_file": "prettier --write \"./src/**/*.{js,jsx}\"",
+    "trim": "rm -rf build node_modules *lock*",
+    "re-build": "rm -rf build node_modules && yarn install && yarn build",
+    "gitSync": "git fetch --all && git pull",
+    "gitUpdate": "yarn gitSync && git add . && git commit -m\"update react-helloworld-tryout,\" && git push",
+    "dev": "yarn --dev && set HTTPS=true&&yarn start",
+    "http": "serve -s build",
+    "lint": "eslint -c ./.eslintrc.js src --ignore-pattern src/tests --ignore-pattern *.test.js --max-warnings 5 --fix",
+    "lint_init": "eslint --init",
+    "docker_rebuild": "docker compose up -d --build && docker compose logs -f ",
+    "into_docker": "docker compose exec -it react /bin/bash"
+  },
+  "eslintConfig": {
+    "extends": [
+      "react-app",
+      "react-app/jest"
+    ],
+    "rules": {
+      "no-unused-vars": "off"
+    }
+  },
+  "browserslist": {
+    "production": [
+      ">0.2%",
+      "not dead",
+      "not op_mini all"
+    ],
+    "development": [
+      "last 1 chrome version",
+      "last 1 firefox version",
+      "last 1 safari version"
+    ]
+  },
+  "devDependencies": {
+    "prettier": "latest",
+    "puppeteer": "latest"
+  }
+}