In Excel you can set the Axis Position to Between Tick Marks. That appeared to be the default for Infragistics 2018.2. However, the default for 2019.1 appears to be On Tick Marks. How do you set this option for JavaScript Excel? Can't figure out which method for the ig.excel.Axis class to use. The position() method doesn't appear to be the right one.
I think the method you are looking for is the axisBetweenCategories.
I tried this method and it doesn't appear to be the correct one. I've tried both axisBetweenCategories(true) and axisBetweenCategories(false).