How to detect when a user selects a material in the default Shapespark material picker palette?

[wojtek]

@neeraj.nath

Specifically, I would like to:
Detect when a user clicks a material sphere in the default material picker (the palette that appears when an editable material is clicked).
Get information about which material was selected and to which mesh/node it was applied.

There is no official way to do it, but as a workaround you can use the method described in Material Picker on which extension? - #3 by Clinton_James

@neeraj.nath

Send this information to the parent window (outside the iframe) to keep the dropdown and thumbnails in sync.

To send information from the iframe to the parent webpage, and back, you can use the postMessage API, as explained in Configurator Commands - #10 by jan.