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122 lines
2.7 KiB
122 lines
2.7 KiB
<!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 - 2014 IOLA and Ole Laursen |
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</div> |
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</body> |
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</html>
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