<html> <head> <title>Real-Time Data Streaming</title> <meta http-equiv="content-type" content="text/html;charset=utf-8"/> <script type="text/javascript" language="javascript" src="./../js/AnyChartStock.js?v=1.9.0r9317"></script> <!-- Randomizer script. It is used to make random more smooth. --> <script type="text/javascript" language="javascript" src="./js/Randomizer.js"></script> <!-- chart size settings --> <style type="text/css"> #chartContainer { width: 800px; height: 550px; float: left; } </style> <script type="text/javascript" language="javascript"> // Creating new chart object. var chart = new AnyChartStock("./../swf/AnyChartStock.swf?v=1.9.0r9317", "./../swf/Preloader.swf?v=1.9.0r9317"); // Setting XML config file. chart.setXMLFile("config.xml"); // Writing the flash object into the page DOM. chart.write("chartContainer"); // Last Close value var lastClose = 31.1350; // Last Date in the data set var timestamp = new Date(1272311940000); // Randomizer instance for Close values var closeRandomizer = new Randomizer(31.1350, 30.99, 31.25, 0.01); // Randomizer instance for Volume var volumeRandomizer = new Randomizer(129800, 6500, 858900, 50800); // Streaming frame interval handler var interval; // Function to start streaming function startStreaming() { // Set Start and Stop buttons states document.getElementById("btnStart").setAttribute("disabled","disabled"); document.getElementById("btnStop").removeAttribute("disabled"); // Update chart each 300 ms interval = setInterval(updateData, 300); // Start adding updateData(); } // Function to add points function updateData() { // increase date (add 1 minute) timestamp.setTime(timestamp.getTime() + 60 * 1000); // random values generation var open = lastClose; // open value - last close var close = closeRandomizer.generateNextValue()+Math.random()*0.03; // random close value var high = Math.max(open, close) + (Math.ceil(Math.random() * 2) / 100) * Math.random(); // random maximal price var low = Math.min(open, close) - (Math.ceil(Math.random() * 2) / 100) * Math.random(); // random minimal price lastClose = close; // store close value var volume = volumeRandomizer.generateNextValue()+Math.random()*500000; // random volume // Format date according to mask set in config.xml for data set named "data". // Mask: %u - Unix timestamp var date = (timestamp.getTime()/1000).toString(); // Create data string accroding to CSV settings for the data set var csvData = date + "," + open + "," + high + "," + low + "," + close + "," + volume; // add created row and remove the one row from the beggining of the dataset chart.appendData("data",csvData, 1); // appply changes chart.commitDataChanges(); } // Function to stop streaming function stopStreaming() { // Set Start and Stop buttons states document.getElementById("btnStart").removeAttribute("disabled"); document.getElementById("btnStop").setAttribute("disabled","disabled"); // stop reccuring updateData calls set using setInterval clearInterval(interval); } //--------------------------------------------------------------------------------------------------- // Enable html controls //--------------------------------------------------------------------------------------------------- chart.onChartDraw = function() { document.getElementById("btnStart").removeAttribute("disabled"); chart.onChartDraw = null; } </script> <!-- table settings --> <style type="text/css"> table.settings { border-style: solid; border-width: 1px; border-color: #D0CDC9; } table.settings tr th { font:normal 60% Verdana; background-color: #DCD9D5; font-weight:bold; padding-bottom:5px; padding-top:5px; padding-left:10px; text-align:left; } table.settings tr td { background-color: #F8F4F0; font:normal 70% Verdana; padding-bottom:2px; padding-top:2px; padding-left:10px; text-align:left; } </style> </head> <body> <div id="chartContainer"><!-- Chart Container --></div> <table class="settings"> <tr><th>Data Streaming:</th></tr> <tr><td><input id="btnStart" type="button" value="Start Streaming" disabled="disabled" onclick="startStreaming()" autocomplete="off" /></td></tr> <tr><td><input id="btnStop" disabled="disabled" type="button" value="Stop Streaming" onclick="stopStreaming()" autocomplete="off" /></td></tr> </table> </body> </html>
Sample Description
How to use this sample?
This sample shows how AnyChart Stock can be used to show changing data in real time. Use "Start Streaming" and "Stop Streaming" buttons to see how it works.
How it works
AnyChart Stock component gives you the ability to add, remove or modify data points in real-time without full chart reloading and redrawing - you can do just what you need in a fast and flexible way.
This sample generates several random data points regularly, upon intervals defined in setInterval function and inserts them into the data set defined in config.xml using appendData function. Every time new data is added commitDataChanges function is called to apply changes.
Please note that chart in this sample contains data chart and technical indicator charts, the data is streamed only into one data set and data series is redrawn and technical indicators are recalculated and redrawn too.
You can learn everything you need to know about real-time data streaming and update in Real-Time Data Streaming and Data Manipulations article.
AnyChartStock JavaScript API
This sample uses the following methods, properties and events from AnyChartStock JavaScript API:
Item | Type | Description |
---|---|---|
appendData | Method | Appends data to the chart. |
commitDataChanges | Method | Commits data appends and data points erasure made by appendData(), removeDataRow() and removeDataRange() method calls. |
setXMLFile | Method | Sets chart XML configuration file path. |
write | Method | Adds the chart to HTML DOM as a child of the specified container. |
onChartDraw | Event | This event is dispatched when the AnyChart Stock is drawn. |
Prerequisites
This section lists all configuration, data and auxiliary files required for this sample.
Configuration file
CSV files
SWF files
- AnyChartStock.swf - AnyChart Stock component.
- Preloader.swf - AnyChart Stock helper component that loads the main component (AnyChartStock.swf) and displays loading progress.
JavaScript Libraries
- Randomizer.js - A sample JavaScript library that generates random values.
- AnyChartStock.js - A JavaScript library that is shipped with AnyChart Stock component. It is used to embed the component into HTML DOM and to comunicate with the Flash part.
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