A demo of the Chrome-only dotted or dashed background grid

This uses the newer addition to canvas from the canvas v5 specification - native dotted and dashed lines. As browsers add support you will be able to use the option in those too but initially it's only supported in Chrome.

obj.Set('background.grid.dashed', true);
obj.Set('background.grid.dotted', true);
[No canvas support] [No canvas support]

This goes in the documents header:
<script src="RGraph.common.core.js"></script>
<script src="RGraph.waterfall.js"></script>
Put this where you want the chart to show up:
<canvas id="cvs1" width="600" height="250">
<canvas id="cvs2" width="600" height="250">
    [No canvas support]
</canvas>
This is the code that generates the chart:
<script>
    new RGraph.Waterfall({
        id: 'cvs1',
        data: [4,8,6,5,-5,-6,6,-5,-4,-3,2,1],
        options: {
            marginTop: 35,
            backgroundGridDashed: true,
            backgroundGridVlinesCount: 13,
            xaxisLabels: [
                'Mal',   'Barry',
                'Gary',  'Neil',
                'Kim',   'Pete',
                'Lou',   'Fred',
                'Jobe',  'Fred',
                'Harry', 'Jake',
                'Total'
            ],
            title: 'A dashed background grid',
            textSize: 12,
            colorsStroke: 'rgba(0,0,0,0)'
        }
    }).draw();

    new RGraph.Waterfall({
        id: 'cvs2',
        data: [4,8,6,5,-5,-6,6,-5,-4,-3,2,1],
        options: {
            marginTop: 35,
            xaxisLabels: [
                'Mal',   'Barry',
                'Gary',  'Neil',
                'Kim',   'Pete',
                'Lou',   'Fred',
                'Jobe',  'Lucy',
                'Kevin', 'Nevil'
            ],
            backgroundGridDotted: true,
            title: 'A dotted background grid',
            colorsStroke: 'rgba(0,0,0,0)'
        }
    }).draw();
</script>