Allow reset of y axis range to "auto"

[pehrlich]

Via the axis range api, the bounds of axis can be specified: http://c3js.org/samples/api_axis_range.html

However, there is no way to set the axis back to the default automatic value. Something like this would be nice:

    chart.axis.min({y: 'auto'});

[vereis]

Does setting it to undefined work? I'm doing something similar though not using the API directly and it works for me.

[pehrlich]

I tried that, without luck. Looks like this would result in having yMin set to undefined in c3_chart_internal_fn.getYDomain = function (targets, axisId, xDomain) {, but follow the logic beyond that didn't get me any further insight.

[nidu]

Hi. I kinda could mimic range reset with following code. Maybe it can help somehow

// chart is this obtained from oninit callback
chart.config.axis_x_min = undefined
chart.config.axis_y_min = undefined
chart.config.axis_y2_min = undefined

chart.config.axis_x_max = undefined
chart.config.axis_y_max = undefined
chart.config.axis_y2_max = undefined

chart.redraw({withUpdateOrgXDomain: true, withUpdateOrgYDomain: true})