222 lines
8.7 KiB
HTML
222 lines
8.7 KiB
HTML
<!DOCTYPE html>
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<html>
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<head>
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<meta http-equiv="X-UA-Compatible" content="chrome=1">
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<!--
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/**
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* o------------------------------------------------------------------------------o
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* | This file is part of the OfficeExcel package - you can learn more at: |
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* | |
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* | http://www.OfficeExcel.net |
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* | |
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* | This package is licensed under the OfficeExcel license. For all kinds of business |
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* | purposes there is a small one-time licensing fee to pay and for non |
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* | commercial purposes it is free to use. You can read the full license here: |
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* | |
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* | http://www.OfficeExcel.net/LICENSE.txt |
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* o------------------------------------------------------------------------------o
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*/
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-->
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<title>Information about how you can update your charts dynamically</title>
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<meta name="keywords" content="OfficeExcel html5 canvas charts docs dynamic" />
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<meta name="description" content="How you can update your charts dynamically using AJAX" />
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<meta name="googlebot" content="NOODP">
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<meta property="og:title" content="OfficeExcel: HTML5 Javascript charts library" />
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<meta property="og:description" content="A charts library based on the HTML5 canvas tag" />
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<meta property="og:image" content="http://www.OfficeExcel.net/images/logo.png"/>
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<link rel="stylesheet" href="../css/website.css" type="text/css" media="screen" />
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<link rel="icon" type="image/png" href="/favicon.png">
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<!-- Place this tag in your head or just before your close body tag -->
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<script type="text/javascript" src="https://apis.google.com/js/plusone.js"></script>
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<script src="../libraries/OfficeExcel.common.core.js" ></script>
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<script src="../libraries/OfficeExcel.common.effects.js" ></script>
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<script src="../libraries/OfficeExcel.common.context.js" ></script>
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<script src="../libraries/OfficeExcel.line.js" ></script>
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<!--[if lt IE 9]><script src="../excanvas/excanvas.original.js"></script><![endif]-->
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<?php PrintAnalyticsCode() ?>
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</head>
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<body>
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<!-- Social networking buttons -->
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<?php
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$prefix = substr($_SERVER['SERVER_NAME'], 0, 3);
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require("/OfficeExcel.{$prefix}/social.html");
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?>
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<!-- Social networking buttons -->
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<div id="breadcrumb">
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<a href="../index.html">OfficeExcel: HTML5 Javascript charts library</a>
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>
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<a href="./index.html">Documentation</a>
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>
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Updating your charts dynamically
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</div>
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<h1>Updating <span>your charts dynamically</span></h1>
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<script>
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if (OfficeExcel.isOld()) {
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document.write('<div style="background-color: #fee; border: 2px dashed red; padding: 5px"><b>Important</b><br /><br /> Internet Explorer does not natively support the HTML5 canvas tag, so if you want to see the charts, you can either:<ul><li>Install <a href="http://code.google.com/chrome/chromeframe/">Google Chrome Frame</a></li><li>Use ExCanvas. This is provided in the OfficeExcel Archive.</li><li>Use another browser entirely. Your choices are Firefox 3.5+, Chrome 2+, Safari 4+ or Opera 10.5+. </li></ul> <b>Note:</b> Internet Explorer 9 fully supports the canvas tag.</div>');
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}
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</script>
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<canvas id="cvs" width="600" height="250" style="float: right">[No canvas support]</canvas>
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<script>
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window.onload = function (e)
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{
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d1 = [];
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d2 = [];
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l = 0;
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// Pre-pad the arrays with 250 null values
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for (var i=0; i<250; ++i) {
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d1.push(null);
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d2.push(null);
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}
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function getGraph(id, d1, d2)
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{
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var graph = new OfficeExcel.Line(id, d1, d2);
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graph.Set('chart.xticks', 100);
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graph.Set('chart.background.barcolor1', 'white');
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graph.Set('chart.background.barcolor2', 'white');
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graph.Set('chart.title.xaxis', 'Time >>>');
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graph.Set('chart.title.yaxis', 'Bandwidth (MB/s)');
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graph.Set('chart.title.vpos', 0.5);
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graph.Set('chart.title', 'Bandwidth used by servers 1 and 2');
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graph.Set('chart.title.yaxis.pos', 0.5);
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graph.Set('chart.title.xaxis.pos', 0.5);
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graph.Set('chart.filled', true);
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graph.Set('chart.fillstyle', ['#daf1fa', '#faa']);
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graph.Set('chart.colors', ['rgb(169, 222, 244)', 'red']);
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graph.Set('chart.linewidth', 1);
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//graph.Set('chart.ylabels.inside', true);
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graph.Set('chart.yaxispos', 'right');
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graph.Set('chart.ymax', 20);
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graph.Set('chart.xticks', 25);
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return graph;
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}
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function drawGraph ()
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{
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OfficeExcel.Clear(document.getElementById("cvs"));
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var graph = getGraph('cvs', d1, d2);
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graph.Draw();
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// Add some data to the data arrays
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var r1 = OfficeExcel.random(7, 9);
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var r2 = OfficeExcel.random(7, 10);
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d1.push(r1);
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d2.push(r2);
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if (d1.length > 250) {
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d1 = OfficeExcel.array_shift(d1);
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d2 = OfficeExcel.array_shift(d2);
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}
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if (document.all && OfficeExcel.isIE8()) {
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alert('[MSIE] Sorry, Internet Explorer 8 is not fast enough to support animated charts');
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} else {
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setTimeout(drawGraph,25);
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// This is an alternative to setTimeout() which uses the newer requestAnimationFrame() function
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//OfficeExcel.Effects.UpdateCanvas(drawGraph);
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}
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}
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drawGraph();
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}
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</script>
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<p>
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The example on the right shows a line chart that automatically updates itself every 25 milliseconds. An ideal
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use for this could be showing a networks bandwidth usage, or a servers load value.
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</p>
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<p>
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This particular example shows a stacked line chart with two data series, though if you're showing load/stress values, a
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non-filled chart might be a better choice.
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</p>
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<p>
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To get up-to-date data from your server you could simply have the page refresh itself, storing the data on the server,
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or use <a href="index.html#ajax">AJAX</a> if you want the data stored client-side.
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</p>
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<p>
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If you're refreshing the chart often, as it is here, refreshing the whole page probably isn't the best idea, so AJAX may be
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the better choice.
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</p>
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<p>
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Be careful of the data types you use to pass the data to OfficeExcel - you should use numbers to represent values, not strings.
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</p>
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<br clear="all" />
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<pre class="code">
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<canvas id="cvs" width="600" height="250">[No canvas support]</canvas>
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<script>
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d1 = [];
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d2 = [];
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// Pre-pad the arrays with 250 null values
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for (var i=0; i< 250; ++i) {
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d1.push(null);
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d2.push(null);
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}
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function getGraph(id, d1, d2)
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{
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var graph = new OfficeExcel.Line(id, d1, d2);
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graph.Set('chart.background.barcolor1', 'white');
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graph.Set('chart.background.barcolor2', 'white');
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graph.Set('chart.title.xaxis', 'Time');
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graph.Set('chart.filled', true);
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graph.Set('chart.fillstyle', ['#daf1fa', '#faa']);
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graph.Set('chart.colors', ['rgb(169, 222, 244)', 'red']);
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graph.Set('chart.linewidth', 3);
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graph.Set('chart.ymax', 20);
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graph.Set('chart.xticks', 25);
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return graph;
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}
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function drawGraph (e)
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{
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// Clear the canvas and redraw the chart
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OfficeExcel.Clear(document.getElementById("cvs"));
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var graph = getGraph('cvs', d1, d2);
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graph.Draw();
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// Add some data to the data arrays
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d1.push(OfficeExcel.random(5, 10));
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d2.push(OfficeExcel.random(5, 10));
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// Get rid of the first values of the arrays
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if (d1.length > 250) {
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d1 = OfficeExcel.array_shift(d1);
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d2 = OfficeExcel.array_shift(d2);
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}
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setTimeout(drawGraph,25);
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}
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drawGraph();
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</script>
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</pre>
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</body>
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</html> |