A basic Gantt chart

[No canvas support]

This goes in the documents header: 
<script src="RGraph.common.core.js"></script>
<script src="RGraph.gantt.js"></script>
Put this where you want the chart to show up: 
<canvas id="cvs" width="800" height="350">
    [No canvas support]
</canvas>
This is the code that generates the chart: 
<script>
    window.onload = function ()
    {
        var data = [
            [31, 28, 67, 'Richard'], [0, 28, 50, 'Rachel'], [12, 28, 45, 'Fred'],
            [59, 14, 0, 'Barney'],   [59, 21, 5, 'Gloria'], [46, 31, 92, 'Paul'],
            [80, 21, 46, 'Harry'],   [94, 17, 84, 'Shane'], [34, 14, 32, 'Kyle'],
            [64, 14, 28, 'Cynthia'], [13, 61, 74, 'Mabel'], [84, 31, 16, 'Paul'],
            [80, 22, 45, 'Kiffen'], [0, 115, 50, 'John']
        ];

        var gantt = new RGraph.Gantt({
            id: 'cvs',
            data: data,
            options: {
                labels: ['January', 'February', 'March', 'April'],
                xmax: 122,
                labelsPercent: true,
                textAccessible: true
            }
        }).draw();
    };
</script>