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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>Flot Examples: Real-time updates</title> <link href="../examples.css" rel="stylesheet" type="text/css"> <!--[if lte IE 8]><script language="javascript" type="text/javascript" src="../../excanvas.min.js"></script><![endif]--> <script language="javascript" type="text/javascript" src="../../jquery.js"></script> <script language="javascript" type="text/javascript" src="../../jquery.flot.js"></script> <script type="text/javascript"> $(function() { // We use an inline data source in the example, usually data would // be fetched from a server var data = [], totalPoints = 300; function getRandomData() { if (data.length > 0) data = data.slice(1); // Do a random walk while (data.length < totalPoints) { var prev = data.length > 0 ? data[data.length - 1] : 50, y = prev + Math.random() * 10 - 5; if (y < 0) { y = 0; } else if (y > 100) { y = 100; } data.push(y); } // Zip the generated y values with the x values var res = []; for (var i = 0; i < data.length; ++i) { res.push([i, data[i]]) } return res; } // Set up the control widget var updateInterval = 30; $("#updateInterval").val(updateInterval).change(function () { var v = $(this).val(); if (v && !isNaN(+v)) { updateInterval = +v; if (updateInterval < 1) { updateInterval = 1; } else if (updateInterval > 2000) { updateInterval = 2000; } $(this).val("" + updateInterval); } }); var plot = $.plot("#placeholder", [ getRandomData() ], { series: { shadowSize: 0 // Drawing is faster without shadows }, yaxis: { min: 0, max: 100 }, xaxis: { show: false } }); function update() { plot.setData([getRandomData()]); // Since the axes don't change, we don't need to call plot.setupGrid() plot.draw(); setTimeout(update, updateInterval); } update(); // Add the Flot version string to the footer $("#footer").prepend("Flot " + $.plot.version + " – "); }); </script> </head> <body> <div id="header"> <h2>Real-time updates</h2> </div> <div id="content"> <div class="demo-container"> <div id="placeholder" class="demo-placeholder"></div> </div> <p>You can update a chart periodically to get a real-time effect by using a timer to insert the new data in the plot and redraw it.</p> <p>Time between updates: <input id="updateInterval" type="text" value="" style="text-align: right; width:5em"> milliseconds</p> </div> <div id="footer"> Copyright © 2007 - 2013 IOLA and Ole Laursen </div> </body> </html>