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<title>XML data example</title>
<meta name="keywords" content="rgraph html5 canvas chart docs xml example" />
<meta name="description" content="XML data example" />
<meta property="og:title" content="RGraph: HTML5 Javascript charts library" />
<meta property="og:description" content="A chart library based on the HTML5 canvas tag" />
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<meta name="description" content="RGraph: HTML5 Javascript charts library - Getting data from an XML file" />
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<script>
/**
* Makes an AJAX call. It calls the given callback (a function) when ready.
* It's the same AjaxCall() function as that in the AJAX documentation.
*
* @param string url The URL to retrieve
* @param function callback A function object that is called when the response is ready, there's an example below
* called "myCallback".
*/
function AjaxCall (url, callback)
{
// Mozilla, Safari, ...
if (window.XMLHttpRequest) {
var httpRequest = new XMLHttpRequest();
// MSIE
} else if (window.ActiveXObject) {
var httpRequest = new ActiveXObject("Microsoft.XMLHTTP");
}
httpRequest.onreadystatechange = callback;
httpRequest.open('GET', url, true);
httpRequest.send();
}
/**
* This sample callback function is called when the data is ready (readyState=4). It is where
* the XML response is parsed, the data pulled out and finally the chart is created.
*/
function myXMLProcessor ()
{
// Check the XMLHttpRequest object readystate
if (this.readyState == 4 && this.status == 200) {
/**
* Create an xmlDoc parse. MSIE has a slightly different syntax to other browsers
*/
if (window.DOMParser) {
var parser = new DOMParser();
var xmlDoc = parser.parseFromString(this.responseText,"text/xml");
} else {
var xmlDoc = new ActiveXObject("Microsoft.XMLDOM");
xmlDoc.async = "false";
xmlDoc.loadXML(this.responseText);
}
/**
* Initialise the arrays that we will populate with data
*/
var john = [];
var fred = [];
var lucy = [];
var days = xmlDoc.getElementsByTagName("stats");
for (var i=0; i<days[0].childNodes.length; ++i) {
var node = days[0].childNodes[i]
if (node.nodeName == 'day') {
var john_tag = node.getElementsByTagName('john');
var fred_tag = node.getElementsByTagName('fred');
var lucy_tag = node.getElementsByTagName('lucy');
john.push(Number(john_tag[0].childNodes[0].nodeValue));
fred.push(Number(fred_tag[0].childNodes[0].nodeValue));
lucy.push(Number(lucy_tag[0].childNodes[0].nodeValue));
}
}
/**
* Now we have the information, create and show the chart
*/
var myLine = new RGraph.Line('cvs', john, fred, lucy);
myLine.Set('chart.title', 'A chart of Johns, Freds and Lucys weekly statistics');
myLine.Set('chart.linewidth', 2);
myLine.Set('chart.hmargin', 5);
myLine.Set('chart.tickmarks', 'endcircle');
myLine.Set('chart.labels', ['Monday','Tuesday','Wednesday','Thursday','Friday','Saturday','Sunday']);
myLine.Set('chart.key', ['John', 'Fred', 'Lucy']);
myLine.Draw();
}
}
/**
* The window.onload function initiates fetching the data from the server. It makes use of the
* AjaxCall() which is detailed in the documentation here: http://www.rgraph.net/docs/index.html#ajax
*/
window.onload = function ()
{
var url = 'http://' + location.host + '/sample.xml';
AjaxCall(url, myXMLProcessor);
}
</script>
</head>
<body>
<!-- Social networking buttons -->
<?php
$prefix = substr($_SERVER['SERVER_NAME'], 0, 3);
require("/rgraph.{$prefix}/social.html");
?>
<!-- Social networking buttons -->
<div id="breadcrumb">
<a href="../index.html">RGraph: HTML5 Javascript charts library</a>
>
<a href="./index.html">Documentation</a>
>
Getting data from an XML file
</div>
<script>
if (RGraph.isOld()) {
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 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>
<h1>Fetching <span>data from an XML file (AJAX)</span></h1>
<div class="warning">
<b>Warning:</b>
Because of the XMLHttpRequest security restrictions this example does not work offline. You can view the online version
<a href="http://www.rgraph.net/docs/xml-data.html" target="_blank">here</a>.
</div>
<canvas id="cvs" width="600" height="250" style="float: right">[No canvas support]</canvas>
<p>
This is an example of fetching data from an XML file that is located on the server. The page uses the XMLHttpRequest (Javascript)
object to fetch the XML file (<a href="http://www.rgraph.net/sample.xml">sample.xml</a>) then parses it in Javascript and creates the chart. The function that parses the XML response
and then uses the data to create the chart is shown below and called <i>myXMLProcessor()</i> (it's the XMLHttpRequest callback function).
</p>
<p>
This example has been tested in modern browsers and also MSIE 7/8 (via MSIE9 compatibility modes).
</p>
<br clear="all" />
<pre class="code">
<script>
// This is the same AJAX function that is defined in the documentation here:
// <a href="http://www.rgraph.net/docs/#ajax">http://www.rgraph.net/docs/#ajax</a>
AjaxCall('/sample.xml', myXMLProcessor);
/**
* This sample callback function is called when the data is ready (readyState=4). It is where
* the XML response is parsed, the data pulled out and finally the chart is created.
*/
function myXMLProcessor ()
{
// Check the readystate to see if the XMLHttpRequest object is ready
if (this.readyState == 4 && this.status == 200) {
/**
* This gets an xmlDoc object, accounting for differences in MSIE and
* other browsers
*/
if (window.DOMParser) {
var parser = new DOMParser();
var xmlDoc = parser.parseFromString(this.responseText,"text/xml");
} else {
var xmlDoc = new ActiveXObject("Microsoft.XMLDOM");
xmlDoc.async = "false";
xmlDoc.loadXML(this.responseText);
}
/**
* Initialise the arrays that we will populate with data
*/
var john = [];
var fred = [];
var lucy = [];
/**
* Now the main loop that goes through the XML extracting the data
*/
var days = xmlDoc.getElementsByTagName("stats");
for (var i=0; i<days[0].childNodes.length; ++i) {
var node = days[0].childNodes[i]
if (node.nodeName == 'day') {
var john_tag = node.getElementsByTagName('john');
var fred_tag = node.getElementsByTagName('fred');
var lucy_tag = node.getElementsByTagName('lucy');
john.push(Number(john_tag[0].childNodes[0].nodeValue));
fred.push(Number(fred_tag[0].childNodes[0].nodeValue));
lucy.push(Number(lucy_tag[0].childNodes[0].nodeValue));
}
}
/**
* Now we have the information, use it to create and show the chart
*/
var myLine = new RGraph.Line('cvs', john, fred, lucy);
myLine.Set('chart.title', 'A chart of Johns, Freds and Lucys weekly statistics');
myLine.Set('chart.linewidth', 2);
myLine.Set('chart.hmargin', 5);
myLine.Set('chart.tickmarks', 'endcircle');
myLine.Set('chart.labels', ['Monday','Tuesday','Wednesday','Thursday','Friday','Saturday','Sunday']);
myLine.Set('chart.key', ['John', 'Fred', 'Lucy']);
myLine.Draw();
}
}
</script>
</pre>
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