I've tried using your code on my system but even getValues() will always only return me the first value in a multivalue text field. setValues() will only work if I pass a single value or an array with exactly one value; all other scenario's don't set any fields in the GUI.

Based on that I believe you would have to use the Anguilla framework to manipulate your field values; the previously mentioned cookbook has examples for field manipulations.

I've tried using your code on my system but even getValues() will always only return me the first value in a multivalue text field. setValues() will only work if I pass a single value or an array with exactly one value; all other scenario's don't set any fields in the GUI.

Based on that I believe you would have to use the Anguilla framework to manipulate your field values; the previously mentioned cookbook has examples for field manipulations.

Edit: further inquiry into the nature of the getValues and setValues functions (sourcecode ftw) has lead me to the following solution:

test.setValues("a,b")

This will successfully set a multivalue checkbox field to both a and b. This must be an exact string match (so if value is A use A and not a).

To clear all values use

test.setValues("null")

It's rather counter-intuitive and afaict riddled with bugs (normal multi value fields don't work, only checkbox fields. Radio buttons are processed as multivalue fields which they are clearly not. Etc.)