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みかづきブログ その3

3ヶ月つづけてみました。

Express と socket.io でローカルにリアルタイム通信をするサーバをたてる

JavaScript

最小限だとこんな感じじゃないでしょうか。

ディレクトリ構成

f:id:kimizuka:20160726145905p:plain


package.json

{
  "name": "app",
  "version": "1.0.0",
  "description": "",
  "main": "app.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "dependencies": {
    "express": "^4.14.0",
    "http": "0.0.0",
    "socket.io": "^1.4.8"
  }
}

app.js

var express = require("express"),
    app     = require("express")(),
    http    = require("http").Server(app),
    io      = require("socket.io")(http);
 
app.use("/", express.static(__dirname + "/public"));

io.on("connection", (evt) => {
  evt.on("handleClickSwitch", function (){
    io.sockets.emit("toggleBodyClass");
  });
});

http.listen(3000, "0.0.0.0");

index.html

<!DOCTYPE html>
<html lang="ja">
<head>
  <meta charset="UTF-8" />
  <title>socket.io</title>
  <meta name="viewport" content="width=device-width, initial-scale=1, minimum-scale=1, maximum-scale=1, user-scalable=no, shrink-to-fit=no" />
  <meta http-equiv="X-UA-Compatible" content="IE=edge" />
  <meta name="format-detection" content="telephone=no">
  <style>
    body {
      background: #ececec;
      transition: background .2s ease-in-out;
    }
    body.on {
      background: #3c3c3c;
    }
    .adjust {
      position: absolute;
      top: 0; bottom: 0;
      left: 0; right: 0;
      margin: auto;
    }
    .btn {
      border-radius: 50%;
      width: 80px;
      height: 80px;
      cursor: pointer;
      user-select: none;
    }
    .btn .hole {
      position: relative;
      border-radius: 50%;
      width: 80px;
      height: 80px;
      box-shadow: 0 4px 4px rgba(0, 0, 0, 0.25);
    }
    .btn .inner {
      position: relative;
      border-radius: 50%;
      width: 80px;
      height: 80px;
      color: rgba(255, 255, 255, 0.9);
      font: 20px AvenirNext-Heavy;
      line-height: 80px;
      text-align: center;
      cursor: pointer;
      transition: opacity .6s ease;
      pointer-events: none;
      overflow: hidden;
    }
    .btn .inner:after {
      display: block;
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      content: "OFF";
      background: linear-gradient(rgba(255, 255, 255, 0.1), rgba(255, 255, 255, 0));
    }
    .on .btn .inner:after {
      content: "ON";
    }
    .btn:hover .hole {
      box-shadow: none;
    }
    .btn:hover .inner {
      top: 4px;
      box-shadow: none !important;
    }
    .btn:hover .inner:after {
      background: rgba(255, 255, 255, 0);
    }
    .btn .inner {
      background: #D500F9;
      box-shadow: 0 2px 0 #880E4F;
      transition: background .2s ease-in-out;
    }    
    .on .btn .inner {
      background: #F50057;
    }
  </style>
</head>
<body>
  <div id="btn" class="btn red adjust">
    <div class="hole">
      <div class="inner"></div>
    </div>
  </div>

  <script src="//ajax.googleapis.com/ajax/libs/jquery/2.1.4/jquery.min.js"></script>
  <script src="//cdn.socket.io/socket.io-1.4.5.js"></script>
  <script>
    (function(win, doc) {

      "use strict";

      var socket = io.connect();

      socket.on("toggleBodyClass", function() {
        $(doc.body).toggleClass("on");
      })

      $("#btn").on("click", function() {
        socket.emit("handleClickSwitch");
      });

    })(window, document);
  </script>
</body>
</html>

複数ウィンドウを開いてボタンを押すと同期しているのがわかります。

f:id:kimizuka:20160726150029p:plain
f:id:kimizuka:20160726150039p:plain