It will also tell you how to import JS-modules (like Highcharts used in your fiddle) and in the examples visualization_source.js you can aswell see how data is processed before it gets fed to the visual. So for which ever transformation on the data you need, it could be done in the formatData. In the updateView function, you could then feed the data to a Highcharts.chart().
Hi, Thanks for the link, I am working my way through it.
I'm not going for a whole view, just change labels on graphs from numeric to a string.
using |chart sum(X) over Y by Z means you have to have numeric scales on the Y axis but need a description rather than numbers.
Using a script appears to be the only way