[offwhite]

resorting to document.querySelectorAll('.canvasjs-chart-toolbar button')[0].click()

but would prefer to trigger the event directly if possible.

[offwhite]

I think it would also help the problem if you could set the viewportMaximum to greater than the last point on the chart.

I understand that you don’t want the user to zoom to an area without data points, but I think it makes more sense for the logic to be

viewportMinimum < last_plotted_point

rather than

viewportMaximum > last_plotted_point

Then, on zoom reset, I could set the viewportMaximum to (last_plotted_point + padding)

selecting this chart area would be trivial.