initial

src/App.css

@@ -0,0 +1,28 @@
+.App {
+  text-align: center;
+}
+
+.App-logo {
+  animation: App-logo-spin infinite 20s linear;
+  height: 80px;
+}
+
+.App-header {
+  background-color: #222;
+  height: 150px;
+  padding: 20px;
+  color: white;
+}
+
+.App-title {
+  font-size: 1.5em;
+}
+
+.App-intro {
+  font-size: large;
+}
+
+@keyframes App-logo-spin {
+  from { transform: rotate(0deg); }
+  to { transform: rotate(360deg); }
+}

src/App.js

@@ -0,0 +1,167 @@
+import React, { Component } from 'react';
+import logo from './logo.svg';
+import './App.css';
+
+import { connect, Provider } from 'react-redux';
+import {Router, Route, Link} from "react-router-dom";
+import createHistory from "history/createBrowserHistory";
+import { createStore, combineReducers } from 'redux';
+
+
+function jsonPost(url, data)
+{
+    return new Promise((resolve, reject) => {
+        var x = new XMLHttpRequest();   
+        x.onerror = () => reject(new Error('jsonPost failed'))
+        //x.setRequestHeader('Content-Type', 'application/json');
+        x.open("POST", url, true);
+        x.send(JSON.stringify(data))
+
+        x.onreadystatechange = () => {
+            if (x.readyState == XMLHttpRequest.DONE && x.status == 200){
+                resolve(JSON.parse(x.responseText))
+            }
+            else if (x.status != 200){
+                reject(new Error('status is not 200'))
+            }
+        }
+    })
+}
+
+
+var addMessageReducer = function(state, action) {
+    //console.log(action)
+    if (state === undefined){
+        return {};
+    }
+    if (action.type === 'addMessage') {
+        return ({nick:action.nick, 
+             message: action.message})
+    }
+
+    if (action.type === 'messageSent') {
+        return ({})
+    }
+    return state;
+}
+
+var getMessagesReducer = function(state, action){
+    if (state === undefined){
+        return ({
+            messageId: 0,
+            messages: []
+        })
+    }
+    if (action.type == 'getMessages'){
+        console.log(state, action)
+        return {
+            messageId: action.data.nextMessageId,
+            messages: [...state.messages,... action.data.data]
+        }
+    }
+    return state;
+}
+
+
+const reducers = combineReducers({
+    newMessage: addMessageReducer,
+    messages: getMessagesReducer
+})
+
+
+var store = createStore(reducers);
+
+store.subscribe(function(){
+    var state = store.getState().newMessage;
+    console.log(state)
+    if (state.nick){
+        jsonPost("http://students.a-level.com.ua:10012", {func: "addMessage", nick: state.nick, message: state.message, author: 'react'})
+        .then(() => store.dispatch({type: 'messageSent'}))
+    }
+})
+
+setInterval(function(){
+    var messageId = store.getState().messages.messageId;
+    jsonPost("http://students.a-level.com.ua:10012", {func: "getMessages", messageId, author: 'react'}) 
+        .then((data) => store.dispatch({type: 'getMessages', data: data}))
+},2000)
+
+class ChatInput extends Component {
+    constructor(){
+        super();
+
+        this.send = this.send.bind(this);
+    }
+
+    send(){
+        store.dispatch({
+            type: 'addMessage',
+            nick: this.nick.value,
+            message: this.message.value
+        })
+    }
+
+    render(){
+        console.log('RENDER CHAT INPUT', this.props.newMessage.nick)
+        return (
+            <div>
+                <input type='text' placeholder='Nick' ref={(c) => this.nick = c} disabled={ !!this.props.newMessage.nick }/>
+                <input type='text' placeholder='Message' ref={(c) => this.message = c} disabled={ !!this.props.newMessage.nick }/>
+                <button onClick={this.send}>Send</button>
+            </div>
+        );
+    }
+}
+
+class ChatLine extends Component{
+    render(){
+        return (
+            <div><b>{this.props.nick}</b>:<span>{this.props.message}</span></div>
+        );
+    }
+}
+
+class Chat extends Component{
+    render(){
+        return (
+        <div>
+            { this.props.messages.messages.map((m, i) => <ChatLine nick={m.nick} message={m.message} key={i}/>) }
+        </div>
+        );
+    }
+}
+
+const mapStateToProps = function(store) {
+  return {
+    newMessage: store.newMessage,
+    messages: store.messages
+  };
+}
+
+ChatInput = connect(mapStateToProps)(ChatInput)
+Chat      = connect(mapStateToProps)(Chat)
+
+
+class App extends Component {
+  render() {
+    return (
+      <div className="App">
+        <header className="App-header">
+          <img src={logo} className="App-logo" alt="logo" />
+          <h1 className="App-title">Welcome to React</h1>
+        </header>
+        <p className="App-intro">
+          To get started, edit <code>src/App.js</code> and save to reload.
+        </p>
+        <Provider store={store}>
+            <div>
+                <ChatInput />
+                <Chat />
+            </div>
+        </Provider>
+      </div>
+    );
+  }
+}
+
+export default App;

src/App.test.js

@@ -0,0 +1,8 @@
+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);
+});

src/index.css

@@ -0,0 +1,5 @@
+body {
+  margin: 0;
+  padding: 0;
+  font-family: sans-serif;
+}

src/index.js

@@ -0,0 +1,8 @@
+import React from 'react';
+import ReactDOM from 'react-dom';
+import './index.css';
+import App from './App';
+import registerServiceWorker from './registerServiceWorker';
+
+ReactDOM.render(<App />, document.getElementById('root'));
+registerServiceWorker();

src/registerServiceWorker.js

@@ -0,0 +1,108 @@
+// In production, we register a service worker to serve assets from local cache.
+
+// 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 the "N+1" visit to a page, since previously
+// cached resources are updated in the background.
+
+// To learn more about the benefits of this model, read https://goo.gl/KwvDNy.
+// This link also includes instructions on opting out of this behavior.
+
+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}$/
+    )
+);
+
+export default function register() {
+  if (process.env.NODE_ENV === 'production' && 'serviceWorker' in navigator) {
+    // The URL constructor is available in all browsers that support SW.
+    const publicUrl = new URL(process.env.PUBLIC_URL, window.location);
+    if (publicUrl.origin !== window.location.origin) {
+      // Our service worker won't work if PUBLIC_URL is on a different origin
+      // from what our page is served on. This might happen if a CDN is used to
+      // serve assets; see https://github.com/facebookincubator/create-react-app/issues/2374
+      return;
+    }
+
+    window.addEventListener('load', () => {
+      const swUrl = `${process.env.PUBLIC_URL}/service-worker.js`;
+
+      if (isLocalhost) {
+        // This is running on localhost. Lets check if a service worker still exists or not.
+        checkValidServiceWorker(swUrl);
+      } else {
+        // Is not local host. Just register service worker
+        registerValidSW(swUrl);
+      }
+    });
+  }
+}
+
+function registerValidSW(swUrl) {
+  navigator.serviceWorker
+    .register(swUrl)
+    .then(registration => {
+      registration.onupdatefound = () => {
+        const installingWorker = registration.installing;
+        installingWorker.onstatechange = () => {
+          if (installingWorker.state === 'installed') {
+            if (navigator.serviceWorker.controller) {
+              // At this point, the old content will have been purged and
+              // the fresh content will have been added to the cache.
+              // It's the perfect time to display a "New content is
+              // available; please refresh." message in your web app.
+              console.log('New content is available; please refresh.');
+            } 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.');
+            }
+          }
+        };
+      };
+    })
+    .catch(error => {
+      console.error('Error during service worker registration:', error);
+    });
+}
+
+function checkValidServiceWorker(swUrl) {
+  // 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.
+      if (
+        response.status === 404 ||
+        response.headers.get('content-type').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);
+      }
+    })
+    .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();
+    });
+  }
+}