more than 2 y axis in dygraphs

Question

Looking through the documentation, I haven't been able to determine if Dygraphs can support more than 2 y axis on the graph outputs? I need to graph a lot of curves with many different axis ranges.

Answer 1

It seems to be possible. This example seems to be using it by using axes and some other options ('labelName': { axis: {} } seems to create another Y-axis), altho I haven't found it in the docs.

But when trying to use more than two Y-axes I saw this message in the log:

dygraphs: Only two y-axes are supported at this time. (Trying to use 3) (stacktrace.js:31:25)

Code from the example:

g = new Dygraph(
    document.getElementById("demodiv"),
    data, {
        labels: ['Date', 'Y1', 'Y2', 'Y3', 'Y4'],
        width: 640,
        height: 350,
        'Y3': {
            axis: {}
        },
        'Y4': {
            axis: 'Y3' // use the same y-axis as series Y3
        },
        xAxisLabelWidth: 100,
        yAxisLabelWidth: 100,
        axes: {
            x: {
                valueFormatter: function(ms) {
                    return 'xvf(' + new Date(ms).strftime('%Y-%m-%d') + ')';
                },
                axisLabelFormatter: function(d) {
                    return 'xalf(' + d.strftime('%Y-%m-%d') + ')';
                },
                pixelsPerLabel: 100,
            },
            y: {
                valueFormatter: function(y) {
                    return 'yvf(' + y.toPrecision(2) + ')';
                },
                axisLabelFormatter: function(y) {
                    return 'yalf(' + y.toPrecision(2) + ')';
                }
            },
            y2: {
                valueFormatter: function(y2) {
                    return 'y2vf(' + y2.toPrecision(2) + ')';
                },
                axisLabelFormatter: function(y2) {
                    return 'y2alf(' + y2.toPrecision(2) + ')';
                }
            }
        }
    }
);