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<title>RGraph: HTML5 Javascript charts library - Adjusting your charts interactively - Gantt chart</title>
<meta name="keywords" content="rgraph html5 canvas chart adjusting docs " />
<meta name="description" content="RGraph: HTML5 Javascript charts library - Documentation about adjusting your charts - Gantt chart" />
<meta property="og:title" content="RGraph: HTML5 Javascript charts library" />
<meta property="og:description" content="A charts library based on the HTML5 canvas tag" />
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<script src="../libraries/RGraph.common.core.js" ></script>
<script src="../libraries/RGraph.common.adjusting.js" ></script>
<script src="../libraries/RGraph.gantt.js" ></script>
<!--[if IE 8]><script src="../excanvas/excanvas.original.js"></script><![endif]-->
<script>
window.onload = function (e)
{
gantt_events = [
[31, 28, null, 'Richard'],
[0, 120, null, 'Bob'],
[84, 16, null, 'Fred'],
[35, 45, null, 'Charles'],
[0, 35, null, 'Kev'],
[0, 28, null, 'Wayne'],
[31, 28, null, 'John']
];
var gantt = new RGraph.Gantt('myc');
gantt.Set('chart.xmax', 120);
gantt.Set('chart.events', gantt_events);
gantt.Set('chart.defaultcolor', 'rgba(255,0,0,0.5)');
gantt.Set('chart.labels', ['January', 'February', 'March', 'April']);
//gantt.Set('chart.borders', false);
gantt.Set('chart.title', 'An adjustable Gantt chart');
gantt.Set('chart.adjustable', true);
gantt.Set('chart.vbars', [
[0, 31, 'rgba(230,230,230,0.8)'],
[59, 31, 'rgba(230,230,230,0.8)']
]);
gantt.Draw();
/**
* This is how to get notified once adjusting has ended
*/
RGraph.AddCustomEventListener(gantt, 'onadjustend',function (obj)
{
var events = obj.Get('chart.events');
var conf = RGraph.Registry.Get('chart.adjusting.gantt');
var idx = conf['index'];
document.getElementById("eventID").value = idx;
document.getElementById("eventStart").value = events[idx][0];
document.getElementById("eventDuration").value = events[idx][1];
});
/**
* This is how to get notified during the adjusting
*/
RGraph.AddCustomEventListener(gantt, 'onadjust',function (obj)
{
var events = obj.Get('chart.events');
var conf = RGraph.Registry.Get('chart.adjusting.gantt');
var idx = conf[0];
document.getElementById("eventID").value = conf['index'];
document.getElementById("eventStart").value = events[conf['index']][0];
document.getElementById("eventDuration").value = events[conf['index']][1];
});
}
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<div id="breadcrumb">
<a href="../index.html">RGraph: HTML5 Javascript charts library</a>
>
<a href="index.html">Documentation</a>
>
<a href="adjusting.html">Adjusting charts interactively</a>
>
Gantt chart
</div>
<h1>RGraph: <span>HTML5 Javascript charts library</span> - Adjusting your charts interactively - Gantt chart</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>
<p>
The Gantt chart can be adjusted by dragging the bars left or right, or the events can be resized if you place the cursor at the
right edge of the event. To get the details of the bar being dragged you can use the
<i>onadjustend</i> event, and in that you can look at the RGraph registry - <i>RGraph.Registry.Get('chart.adjusting.gantt')</i> The
returned array consists of:
<ul>
<li>The numerical index of the event being adjusted (corresponding to the chart.events array that you set).</li>
<li>The chart object</li>
<li>The starting X position of the bar (before the chart was adjusted)</li>
<li>The starting Y position of the bar (before the chart was adjusted)</li>
<li>The original numerical value (in relation to your chart.xmax) that the bar started at</li>
</ul>
</p>
<p>
When adjusting is complete the <i>chart.events</i> array is updated. So you can use the numerical index that you find in
the registry (as above) with the <i>chart.events</i> array to get up-to-date event information.
</p>
<p>
<b>Note:</b>
The Gantt chart uses console.log() to send notifications. Press CTRL+SHIFT+J in Chrome to see the console, or use Firebug in
Firefox. Other browsers will vary.
</p>
<canvas id="myc" width="1000" height="250">[No canvas support]</canvas>
Event ID: <input type="text" id="eventID" readonly />
Event start: <input type="text" id="eventStart" readonly />
Event duration: <input type="text" id="eventDuration" readonly />
<pre class="code">
<script>
window.onload = function (e)
{
gantt_events = [
[31, 28, null, 'Richard'],
[0, 120, null, 'Bob'],
[84, 16, null, 'Fred'],
[35, 45, null, 'Charles'],
[0, 35, null, 'Kev'],
];
var gantt = new RGraph.Gantt('myc');
gantt.Set('chart.xmax', 120);
gantt.Set('chart.events', gantt_events);
gantt.Set('chart.defaultcolor', '#0c0');
gantt.Set('chart.labels', ['January', 'February', 'March', 'April']);
gantt.Set('chart.borders', false);
gantt.Set('chart.adjustable', true);
gantt.Draw();
/**
* This is how to get notified once adjusting has ended
*/
RGraph.AddCustomEventListener(gantt, 'onadjustend',function (obj)
{
var idx = RGraph.Registry.Get('chart.adjusting.gantt')[0];
});
/**
* This is how to get notified during the adjusting
*/
RGraph.AddCustomEventListener(gantt, 'onadjust',function (obj)
{
var events = obj.Get('chart.events');
var conf = RGraph.Registry.Get('chart.adjusting.gantt');
var idx = conf[0];
document.getElementById("eventID").value = conf[0];
document.getElementById("eventStart").value = events[conf[0]][0];
document.getElementById("eventDuration").value = events[conf[0]][1];
});
}
</script>
</pre>
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