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Dynamic Real-time Chart Using Chart.js, Socket.io, and Knockout.js
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <meta name="viewport" content="width=device-width, initial-scale=1.0"> | |
| <meta name="author" content="Galenic"> | |
| <script src="js/jquery-1.9.1.js"></script> | |
| <script src="js/knockout-2.1.0.js"></script> | |
| <script src="js/Chart.js"></script> | |
| <link rel="stylesheet" href="pure-min.css"> | |
| <link rel="stylesheet" href="custom.css"> | |
| <title>Chart.js sample</title> | |
| </head> | |
| <body> | |
| <div class="pure-u-1"> | |
| <div> | |
| <canvas id="canvas" height="450" width="600"></canvas> | |
| </div> | |
| </div> | |
| <script src="/socket.io/socket.io.js"></script> | |
| <script type="text/javascript"> | |
| function MainViewModel(data) { | |
| var self = this; | |
| var socket = io.connect('http://localhost:8070'); | |
| self.lineChartData = ko.observable({ | |
| labels : ["January","February","March","April","May","June","July"], | |
| datasets : [ | |
| { | |
| fillColor : "rgba(151,187,205,0.5)", | |
| strokeColor : "rgba(151,187,205,1)", | |
| pointColor : "rgba(151,187,205,1)", | |
| pointStrokeColor : "#fff", | |
| data : [65,59,90,81,56,55,40] | |
| } | |
| ] | |
| }); | |
| socket.on('pushdata', function (data) { | |
| self.lineChartData().datasets[0].data.shift(); | |
| self.lineChartData().datasets[0].data.push(data); | |
| self.initLine(); | |
| }); | |
| self.initLine = function() { | |
| var options = { | |
| animation : false, | |
| scaleOverride : true, | |
| scaleSteps : 10,//Number - The number of steps in a hard coded scale | |
| scaleStepWidth : 10,//Number - The value jump in the hard coded scale | |
| scaleStartValue : 10//Number - The scale starting value | |
| }; | |
| var ctx = $("#canvas").get(0).getContext("2d"); | |
| var myLine = new Chart(ctx).Line( vm.lineChartData(), options ); | |
| } | |
| } | |
| var vm = new MainViewModel(); | |
| ko.applyBindings(vm); | |
| vm.initLine(); | |
| </script> | |
| </body> | |
| </html> |
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| var application_root = __dirname, | |
| express = require('express'), | |
| path = require("path"); | |
| app = express(); | |
| var server = require('http').createServer(app), | |
| io = require('socket.io').listen(server); | |
| app.configure(function () { | |
| app.use(express.logger('dev')); | |
| app.use(express.bodyParser()); | |
| app.use(express.static(path.join(application_root, "public"))); | |
| }); | |
| ///DATA | |
| function getRandomInt(min, max) { | |
| return Math.floor(Math.random() * (max - min + 1)) + min; | |
| } | |
| io.sockets.on('connection', function (socket) { | |
| setInterval(function(){ | |
| var data = getRandomInt(0,100); | |
| io.sockets.emit('pushdata', data); | |
| },2000); | |
| }); | |
| server.listen(8070); | |
| console.log('Server is listening on port 8070...'); |
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