{"id":252,"date":"2021-05-02T09:23:54","date_gmt":"2021-05-02T09:23:54","guid":{"rendered":"https:\/\/www.369usa.com\/blog\/?p=252"},"modified":"2021-05-02T09:23:54","modified_gmt":"2021-05-02T09:23:54","slug":"socket-io-study","status":"publish","type":"post","link":"https:\/\/www.369usa.com\/blog\/socket-io-study\/","title":{"rendered":"Socket IO Study"},"content":{"rendered":"

server.js<\/p>\n

\r\nvar app = require(\"express\")();\r\nvar http = require(\"http\").Server(app);\r\nvar io = require(\"socket.io\")(http);\r\n\r\napp.get(\"\/\", (req, res) => {\r\n  res.sendFile(__dirname + \"\/index.html\");\r\n});\r\n\r\nvar clientCount = 0;\r\n\r\nio.on(\"connection\", (socket) => {\r\n  console.log(`A user connected: id = ${socket.id}`);\r\n  io.to(socket.id).emit(\r\n    \"message box\",\r\n    `Server says: Welcome to the chat room, id ${socket.id}`\r\n  ); \/\/ Send to specific guy.\r\n\r\n  \/\/ List all active user's socket ids.\r\n  \/\/ io.sockets.sockets.forEach( client => {\r\n  \/\/   console.log(`Send welcome message to ${client.id}`);\r\n  \/\/ });\r\n\r\n  io.sockets.emit(\"client count\", ++clientCount); \/\/ Send to every one.\r\n  socket.broadcast.emit(\"message box\", `There is a new guy joined! `); \/\/ Send to every one but the one himself.\r\n\r\n  socket.on(\"chat message\", (msgObj) => {\r\n    io.sockets.emit(\r\n      \"message box\",\r\n      `(id:${msgObj.id}) ${msgObj.name} says: ${msgObj.message}`\r\n    ); \/\/ Send to every one.\r\n  });\r\n  socket.on(\"disconnect\", () => {\r\n    console.log(`User with id = ${socket.id} disconnected.`);\r\n    io.sockets.emit(\"client count\", --clientCount); \/\/ Send to every one.\r\n  });\r\n});\r\n\r\nhttp.listen(3000, () => {\r\n  console.log(\"Server is listening on *:3000\");\r\n});\r\n\r\n<\/pre>\n
index.html<\/p>\n
\r\n<body>\r\n\r\n<p><b>User: <span id=\"username\"><\/span><\/b><\/p>\r\n<hr \/>\r\n\r\n<div>\r\n    Current total users online: <span id=\"total-user-count\"><\/span>.\r\n    <hr \/>\r\n<\/div>\r\n\r\n<form id=\"form\">\r\n    <input id=\"input\" type=\"text\" \/>\r\n    <input type=\"submit\" value=\"send\"\/>\r\n<\/form>\r\n\r\n<div>\r\n    <p><b>Message Box:<\/b><\/p>\r\n    <p><hr \/><\/p>\r\n    <div id=\"msg-box\"><\/div>\r\n    <p><hr \/><\/p>\r\n<\/div>\r\n\r\n<script src=\"\/socket.io\/socket.io.js\"><\/script>\r\n<script>\r\n\r\n  var urlParams = new URLSearchParams(window.location.search);\r\n  var username = urlParams.get('name');\r\n\r\n  var socket = io();\r\n\r\n  var form = document.getElementById('form');\r\n  var input = document.getElementById('input');\r\n  var usernameBox = document.getElementById('username');\r\n  var msgBox = document.getElementById('msg-box');\r\n  var userCountBox = document.getElementById('total-user-count');\r\n\r\n  if(username){\r\n    usernameBox.textContent = username;\r\n  }\r\n  else{\r\n      console.error('Must set a valid username!');\r\n      document.body.innerHTML = '';\r\n      document.write('Must set a valid username!');\r\n      socket.disconnect();\r\n  }\r\n\r\n  socket.on('client count', function(msg) {\r\n    userCountBox.textContent = msg;\r\n  });\r\n\r\n  socket.on('message box', function(msg) {\r\n    var item = document.createElement('p');\r\n    item.textContent = msg;\r\n    msgBox.appendChild(item);\r\n  });\r\n\r\n  form.addEventListener('submit', function(e) {\r\n    e.preventDefault();\r\n    if (input.value) {\r\n      socket.emit('chat message', {name: username, message: input.value, id: socket.id});\r\n      input.value = '';\r\n    }\r\n  });\r\n<\/script>\r\n\r\n<\/body>\r\n\r\n<\/pre>\n
Good Sources:<\/p>\n
https:\/\/www.tutorialspoint.com\/socket.io\/index.htm<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
server.js var app = require(“express”)(); var http = require(“http”).Server(app); var io = require(“socket.io”)(http); app.get(“\/”, (req, res) => { res.sendFile(__dirname + “\/index.html”); }); var clientCount = 0; io.on(“connection”, (socket) => { console.log(`A user connected: id = ${socket.id}`); io.to(socket.id).emit( “message box”, `Server says: Welcome to the chat room, id ${socket.id}` ); \/\/ Send to specific guy. \/\/ … Continue reading “Socket IO Study”<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[],"class_list":["post-252","post","type-post","status-publish","format-standard","hentry","category-5"],"yoast_head":"\nSocket IO Study - \u7ebd\u7ea6\u7f51\u7ad9\u8bbe\u8ba1\u535a\u5ba2<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.369usa.com\/blog\/socket-io-study\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Socket IO Study - \u7ebd\u7ea6\u7f51\u7ad9\u8bbe\u8ba1\u535a\u5ba2\" \/>\n<meta property=\"og:description\" content=\"server.js var app = require("express")(); 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