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<title>Making annotations shareable cross browser</title>
<meta name="keywords" content="rgraph html5 canvas chart docs annotating shareable cross browser" />
<meta name="description" content="Making annotations shareable cross browser" />
<meta property="og:title" content="RGraph: HTML5 Javascript charts library" />
<meta property="og:description" content="A chart library based on the HTML5 canvas tag" />
<meta property="og:image" content="http://www.rgraph.net/images/logo.png"/>
<link rel="stylesheet" href="../css/website.css" type="text/css" media="screen" />
<link rel="icon" type="image/png" href="../images/favicon.png">
<!-- Place this tag in your head or just before your close body tag -->
<script type="text/javascript" src="https://apis.google.com/js/plusone.js"></script>
<script src="../libraries/RGraph.common.core.js"></script>
<script src="../libraries/RGraph.common.annotate.js"></script>
<script src="../libraries/RGraph.common.context.js"></script>
<script src="../libraries/RGraph.line.js"></script>
<!--[if lt IE 9]><script src="../excanvas/excanvas.original.js"></script><![endif]-->
<script>
/**
* The function that loads the annotations from the server
*/
function LoadAnnotations ()
{
var canvasPosition = RGraph.getCanvasXY(g.canvas);
var div = document.createElement('DIV');
div.style.backgroundColor = 'white';
div.style.padding = '3px';
div.style.position = 'absolute';
div.style.left = canvasPosition[0] + 5 + 'px';
div.style.top = canvasPosition[1] + 5 + 'px';
div.style.color = 'gray';
div.style.opacity = 1;
div.style.border = '2px solid black';
div.style.zIndex = 99;
div.innerHTML = 'Loading annotations...';
document.body.appendChild(div);
div2 = document.createElement('DIV');
div2.style.backgroundColor = 'gray';
div2.style.opacity = 0.5;
div2.style.position = 'absolute';
div2.style.left = canvasPosition[0] + 'px';
div2.style.top = canvasPosition[1] + 'px';
div2.style.width = g.canvas.width + 'px';
div2.style.height = g.canvas.height + 'px';
//div2.style.zIndex = 98;
document.body.appendChild(div2);
window.localStorage['__rgraph_annotations_cvs__'] = '';
AjaxGet('annotate_persist.html?getannotations=12',
function ()
{
if (this.readyState == 4 && this.status == 200) {
window.localStorage['__rgraph_annotations_cvs__'] = this.responseText;
RGraph.ReplayAnnotations(g);
setTimeout(function () {div.style.opacity = 0.8; div2.style.opacity = 0.4;}, 50);
setTimeout(function () {div.style.opacity = 0.6;div2.style.opacity = 0.3;}, 100);
setTimeout(function () {div.style.opacity = 0.4;div2.style.opacity = 0.2;}, 150);
setTimeout(function () {div.style.opacity = 0.2;div2.style.opacity = 0.1;}, 200);
setTimeout(function () {div.style.opacity = 0;div2.style.opacity = 0;}, 250);
setTimeout(function () {div.style.display = 'none';div2.style.display = 'none';}, 300);
}
}
);
}
/**
* The function that saves annotations to the server
*/
function SaveAnnotations ()
{
var canvasPosition = RGraph.getCanvasXY(g.canvas);
var div = document.createElement('DIV');
div.style.backgroundColor = 'white';
div.style.padding = '3px';
div.style.position = 'absolute';
div.style.left = canvasPosition[0] + 5 + 'px';
div.style.top = canvasPosition[1] + 5 + 'px';
div.style.color = 'gray';
div.style.opacity = 1;
div.style.border = '2px solid black';
div.style.zIndex = 99;
div.innerHTML = 'Saving annotations...';
document.body.appendChild(div);
AjaxPost('annotate_persist.html', 'data=' + window.localStorage['__rgraph_annotations_cvs__']);
setTimeout(function () {div.style.opacity = 0.8}, 50);
setTimeout(function () {div.style.opacity = 0.6}, 100);
setTimeout(function () {div.style.opacity = 0.4}, 150);
setTimeout(function () {div.style.opacity = 0.2}, 200);
setTimeout(function () {div.style.opacity = 0; div.style.display = 'none';}, 250);
}
/**
* Makes an AJAX POST.
*/
function AjaxPost (url, data)
{
// 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('POST', url, true);
httpRequest.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
httpRequest.send(data);
}
/**
* Makes an AJAX call. It calls the given callback (a function) when ready
*
* @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 AjaxGet (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();
}
window.onload = function (e)
{
/**
* This clears the locally stored annotations so that they can be loaded from server
*/
window.localStorage['__rgraph_annotations_cvs__'] = '';
// Purposefully a global
g = new RGraph.Line('cvs', [5,6,3,4,8,6,7,5,9]);
g.Set('chart.tickmarks', 'endcircle');
g.Set('chart.hmargin', 5);
g.Set('chart.annotatable', RGraph.isOld() ? false : true);
g.Set('chart.labels', ['Ben','Olga','Jeff','Indigo','Kev','Pete','Lou','Fred','John']);
g.Set('chart.contextmenu', RGraph.isOld() ? null : [['Show palette', RGraph.Showpalette], ['Clear', function () {RGraph.Clear(g.canvas);g.Draw();}]]);
g.Set('chart.shadow', true);
g.Set('chart.linewidth', 1.01);
g.Set('chart.ylabels.count', 10);
g.Draw();
LoadAnnotations();
RGraph.AddCustomEventListener(g, 'onannotateend', function (obj) {SaveAnnotations();});
RGraph.AddCustomEventListener(g, 'onannotateclear', function (obj) {SaveAnnotations();});
}
</script>
<script>
var _gaq = _gaq || [];
_gaq.push(['_setAccount', 'UA-54706-2']);
_gaq.push(['_trackPageview']);
(function() {
var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true;
ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
})();
</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>
>
Cross-browser annotations
</div>
<h1>Making <span>annotations shareable cross browser</span></h1>
<div style="text-align: center">
<div class="warning" style="display: inline-block">
This example does not work offline - you must use a website. Annotations are removed every five minutes.
</div>
</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>
<canvas id="cvs" width="600" height="250" style="float: right">[No canvas support]</canvas>
<p>
Combining a little AJAX and some very simple server side scripting, you can easily make an annotation system that can persist
across different browsers and computers. You an either use Load/Save buttons to trigger the loading and saving, or like the
example to the right you can make use of the custom RGraph onannotateend event to make it happen automatically.
</p>
<p>
This simple example uses a small PHP server side script that loads and saves the annotation data to a file on the server,
and that looks like this:
</p>
<br clear="all" />
<pre class="code">
<?php
$file = '/tmp/annotation_data';
/**
* Save the annotations to a tmp file
*/
if (isset($_POST) && isset($_POST['data'])) {
file_put_contents($file, $_POST['data']);
exit;
}
/**
* Load the annotations
*/
if (!empty($_GET['getannotations']) && $_GET['getannotations'] == 1) {
$contents = file_get_contents($file);
print($contents);
exit;
}
?>
</pre>
<p>
By making the Javascript Save/Load functions repeat themselves every few seconds, you could easily make a presentation/demo system
that can be used when paticipants are in differing locations - in a similar fashion to Google Docs - or when you want one persons
annotations to be viewable by multiple PCs. On this page though, the Save function is triggered by the custom RGraph event
<i>onannotateend</i>.
</p>
</body>
</html>