I'm not sure why you want a JS solution. You can do it with one of the Formidable hooks, frm_setup_new_fields_vars
Thans Rob I missed that. I think some JS will be needed as I am populating with selections from an independent tree widget, but I expect I can get it all working.
I've certainly populated dropdowns in JS, but the data is still retrieved by an Ajax call, so, in the end the data came from a PHP program anyway. Good luck.
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