Sample React-Express-MongoDB (#59)

Signed-off-by: Afzal <sah.afzal@gmail.com>

react-express-mongodb/frontend/src/App.js

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+import React from 'react';
+import {request} from './utilities/httpRequestHandler'
+import './App.scss';
+import AddTodo from "./components/AddTodo";
+import TodoList from "./components/TodoList";
+
+export default class App extends React.Component{
+
+  constructor(props){
+    super(props);
+
+    this.state = {
+      todos: []
+    }
+  }
+
+  componentDidMount() {
+      request('get','/api')
+          .then((response) => {
+              this.setState({
+                  todos: response.data.data
+              })
+          }).catch((e) => console.log('Error : ', e))
+  }
+
+    _handleAddTodo = (value) => {
+      request('post', '/api/todos', {text:value})
+          .then((response) => {
+              let todosCopy = this.state.todos;
+              todosCopy.unshift({text:value});
+              this.setState({
+                  todos : todosCopy
+              });
+              this.refs.todo.value = ""
+          }).catch((e) => console.log('Error : ', e));
+    };
+
+
+  render() {
+    return (
+        <div className="App container">
+          <div className="container-fluid">
+            <div className="row">
+              <div className="col-xs-12 col-sm-8 col-md-8 offset-md-2">
+                <h1>Todos</h1>
+                  <div className="todo-app">
+                      <AddTodo handleAddTodo={(value) => {this._handleAddTodo(value)}}/>
+                      <TodoList todos={this.state.todos}/>
+                  </div>
+              </div>
+            </div>
+          </div>
+        </div>
+    );
+  }
+}

react-express-mongodb/frontend/src/App.scss

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+.App {
+  text-align: center;
+}
+.todo-app {
+  background-color: #efefef;
+  padding: 1.2em;
+  .new-todo{
+    display: flex;
+    justify-content: space-between;
+    align-items: center;
+    input{
+      width: 80% !important;
+    }
+  }
+}
+
+//.list-group-item{
+//  &.active:hover{
+//
+//  }
+//  &active:hover{
+//    background-color: #d3d3d3;
+//  }
+//}

react-express-mongodb/frontend/src/App.test.js

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+import React from 'react';
+import ReactDOM from 'react-dom';
+import App from './App';
+
+it('renders without crashing', () => {
+  const div = document.createElement('div');
+  ReactDOM.render(<App />, div);
+  ReactDOM.unmountComponentAtNode(div);
+});

react-express-mongodb/frontend/src/components/AddTodo.js

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+import React from 'react';
+
+export default class AddTodo extends React.Component {
+
+    _onAddTodo = () => {
+        if(this.refs.todo.value.length > 0) {
+            this.props.handleAddTodo(this.refs.todo.value);
+            this.refs.todo.value = '';
+        }
+    };
+
+    render() {
+        return (
+            <div className="new-todo form-group">
+                <input type="text" className="form-control" ref="todo"/>
+                <button className="btn btn-primary" onClick={this._onAddTodo}>
+                    Add Todo
+                </button>
+            </div>
+        )
+    }
+}

react-express-mongodb/frontend/src/components/TodoList.js

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+import React from 'react';
+
+export default class TodoList extends React.Component {
+
+    constructor(props){
+        super(props);
+
+        this.state = {
+            activeIndex:0,
+        }
+    }
+
+    _handleActive(index) {
+        this.setState({
+            activeIndex: index
+        })
+    }
+
+    _renderTodos(todos) {
+        return (
+            <ul className="list-group">
+                {
+                    todos.map((todo, i) => {
+                        return (<li className={'list-group-item cursor-pointer ' + (i===this.state.activeIndex ? 'active' : '')}
+                                    key={i}
+                                    onClick={() => {this._handleActive(i)}}
+                        >
+                            {todo.text}
+                        </li>)
+                    })
+                }
+            </ul>
+        )
+    }
+
+
+    render() {
+        let { todos } = this.props;
+        return (
+            todos.length > 0 ?
+                this._renderTodos(todos)
+                :
+                <div className="alert alert-primary" role="alert">
+                    No Todos to display
+                </div>
+        )
+    }
+}

react-express-mongodb/frontend/src/config/constants.js

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+const config = {
+    API_BASE_URL: 'http://localhost:3000',
+};
+
+export default config;

react-express-mongodb/frontend/src/custom.scss

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+// Override default variables before the import
+$body-bg: #fff;
+// Import Bootstrap and its default variables
+@import '~bootstrap/scss/bootstrap.scss';
+
+.cursor-pointer {
+  cursor: pointer;
+}

react-express-mongodb/frontend/src/index.css

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+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;
+}

react-express-mongodb/frontend/src/index.js

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

react-express-mongodb/frontend/src/serviceWorker.js

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

react-express-mongodb/frontend/src/utilities/httpRequestHandler.js

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+import axios from 'axios';
+import config from '../config/constants';
+
+
+export async function request (method, uri, data, headers = null, params = null) {
+    let url = (config.API_BASE_URL + uri);
+    let query = {
+        method: method,
+        url: url
+    };
+    if (headers !== null)
+        query.headers = headers;
+    if (params !== null)
+        query.params = params;
+    if (method === 'post' || method === 'put' || method === 'delete' || method === 'patch')
+        query.data = data;
+    try {
+        return await axios(query);
+    } catch (e) {
+         throw e;
+    }
+}