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February 11, 2015 17:14
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RealTime chart with ChartJS, Socket.io and KnockoutJS
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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="lnmunhoz"> | |
| <script src="http://code.jquery.com/jquery-1.9.1.js"></script> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/knockout/2.1.0/knockout-min.js"></script> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/1.0.1/Chart.js"></script> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/socket.io/1.3.3/socket.io.min.js"></script> | |
| <title>Chart.js with Socket.io</title> | |
| </head> | |
| <body> | |
| <div> | |
| <canvas id="canvas" height="450" width="600"></canvas> | |
| </div> | |
| <script type="text/javascript"> | |
| function MainViewModel(data) { | |
| var self = this; | |
| var socket = io.connect('localhost:8080'); | |
| 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, // The number of steps in a hard coded scale | |
| scaleStepWidth : 10, // The value jump in the hard coded scale | |
| scaleStartValue : 10 // 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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| { | |
| "name": "realTimeChart", | |
| "version": "1.0.0", | |
| "description": "Real Time Chart", | |
| "main": "server.js", | |
| "scripts": { | |
| "test": "echo \"Error: no test specified\" && exit 1", | |
| "start": "node server.js" | |
| }, | |
| "author": "lnmunhoz", | |
| "license": "MIT", | |
| "dependencies": { | |
| "express": "^4.11.2", | |
| "socket.io": "^1.3.3" | |
| } | |
| } |
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| var app = require('express')(); | |
| var server = require('http').Server(app); | |
| var io = require('socket.io')(server); | |
| server.listen(8080); | |
| console.log('Server listening on port :8080'); | |
| app.get('/', function (req, res) { | |
| res.sendfile(__dirname + '/index.html'); | |
| }); | |
| function getRandomInt(min, max) { | |
| return Math.floor(Math.random() * (max - min + 1)) + min; | |
| } | |
| io.on('connection', function (socket) { | |
| setInterval(function(){ | |
| var data = getRandomInt(0,100); | |
| io.sockets.emit('pushdata', data); | |
| },2000); | |
| }); |
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