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<title>RGraph: HTML5 Javascript charts library - Updating your charts dynamically</title>
<meta name="keywords" content="rgraph html5 canvas charts docs dynamic" />
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<a href="../index.html">RGraph: HTML5 Javascript charts library</a>
>
<a href="index.html">Documentation</a>
>
Updating your charts dynamically
</div>
<h1>RGraph: <span>HTML5 Javascript charts library</span> - Updating your charts dynamically</h1>
<script>
if (RGraph.isIE8()) {
document.write('<div style="background-color: #fee; border: 2px dashed red; padding: 5px"><b>Important</b><br /><br /> Internet Explorer 8 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 RGraph 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>');
}
</script>
<canvas id="cvs" width="600" height="250" style="float: right">[No canvas support]</canvas>
<script>
window.onload = function (e)
{
d1 = [];
d2 = [];
// Pre-pad the arrays with 100 null values
for (var i=0; i<100; ++i) {
d1.push(null);
d2.push(null);
}
function getGraph(id, d1, d2)
{
var graph = new RGraph.Line(id, d1, d2);
graph.Set('chart.xticks', 100);
graph.Set('chart.background.barcolor1', 'white');
graph.Set('chart.background.barcolor2', 'white');
graph.Set('chart.title.xaxis', 'Time >>>');
graph.Set('chart.title.yaxis', 'Bandwidth (MB/s)');
graph.Set('chart.title.vpos', 0.5);
graph.Set('chart.title', 'Bandwidth used by servers 1 and 2');
graph.Set('chart.filled', true);
graph.Set('chart.fillstyle', ['#daf1fa', '#faa']);
graph.Set('chart.colors', ['rgb(169, 222, 244)', 'red']);
graph.Set('chart.linewidth', 1);
//graph.Set('chart.ylabels.inside', true);
graph.Set('chart.yaxispos', 'right');
graph.Set('chart.ymax', 20);
graph.Set('chart.xticks', 25);
return graph;
}
function drawGraph ()
{
RGraph.Clear(document.getElementById("cvs"));
var graph = getGraph('cvs', d1, d2);
graph.Draw();
// Add some data to the data arrays
var r1 = RGraph.random(7, 9);
var r2 = RGraph.random(7, 10);
d1.push(r1);
d2.push(r2);
if (d1.length > 100) {
d1 = RGraph.array_shift(d1);
d2 = RGraph.array_shift(d2);
}
if (document.all && RGraph.isIE8()) {
alert('[MSIE] Sorry, Internet Explorer 8 is not fast enough to support animated charts');
} else {
setTimeout(drawGraph,25);
}
}
drawGraph();
}
</script>
<p>
The example on the right shows a line chart that automatically updates itself every 15 milliseconds. An ideal
use for this could be showing a networks bandwidth usage, or a servers load value.
</p>
<p>
This particular example shows a stacked line chart with two data series, though if you're showing load/stress values, a
non-filled chart might be a better choice.
</p>
<p>
To get up-to-date data from your server you could simply have the page refresh itself, storing the data on the server,
or use <a href="index.html#ajax">AJAX</a> if you want the data stored client-side.
</p>
<p>
Be careful of the data types you use to pass the data to RGraph - you should use numbers to represent values, not strings.
</p>
<br clear="all" />
<pre class="code">
<canvas id="cvs" width="600" height="250">[No canvas support]</canvas>
<script>
d1 = [];
d2 = [];
// Pre-pad the arrays with 100 null values
for (var i=0; i< 100; ++i) {
d1.push(null);
d2.push(null);
}
function getGraph(id, d1, d2)
{
var graph = new RGraph.Line(id, d1, d2);
graph.Set('chart.background.barcolor1', 'white');
graph.Set('chart.background.barcolor2', 'white');
graph.Set('chart.title.xaxis', 'Time');
graph.Set('chart.filled', true);
graph.Set('chart.fillstyle', ['#daf1fa', '#faa']);
graph.Set('chart.colors', ['rgb(169, 222, 244)', 'red']);
graph.Set('chart.linewidth', 3);
graph.Set('chart.ymax', 20);
graph.Set('chart.xticks', 25);
return graph;
}
function drawGraph (e)
{
// Clear the canvas and redraw the chart
RGraph.Clear(document.getElementById("cvs"));
var graph = getGraph('cvs', d1, d2);
graph.Draw();
// Add some data to the data arrays
d1.push(RGraph.random(5, 10));
d2.push(RGraph.random(5, 10));
// Get rid of the first values of the arrays
if (d1.length > 100) {
d1 = RGraph.array_shift(d1);
d2 = RGraph.array_shift(d2);
}
setTimeout(drawGraph,25);
}
drawGraph();
</script>
</pre>
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