I am developing my own custom Axis and Tooltip Formatters. I would like the yAxis and Point labels to render values differently depending on the type of data being displayed (e.g. volume, percentage, US dollars, British Pound, etc.)
It is not possible to determine the type of data from just the single value or point. The context of the type of data is set on the series or chart. It is not set once statically. I retrieve different data sets dynamically using based on users inputs (e.g. financial instrument symbol .DJI, AAPL, BP.L, etc.).
I have not found a way to access the series or chart context from the Axis or Tooltip formatter. I have also not been able to find a way to reset the formatter in the Ajax "success" handler.