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