OK, I got this solved. Turns out I had a bug in my django template inheritance, which was causing selectize to load before jquery.
In an odd sort of way, the issue with the Content Security Policy violations turned out to be important. I knew it was a problem, but blew off doing anything about it because it was just warnings. It turns out I was getting a javascript console error about $ not being defined, but it was lost in all the noise from all the CSP warnings. Once I cleared those up, all that was left was the $ not defined error and it became obvious what was going on.
I think there's like some basic software engineering lesson in there :-)
I'm mostly a python guy, who only dabbles in javascript when I can't avoid it :-)
I've got a django-based tool (
https://tools.wmflabs.org/spi-tools-dev/spi/) which uses selectize.js. For simple cases, everything works fine. But, if I click on the drop-down, delete the contents, type in a new value, and submit the form (Sock Info button), the submitted form data has case_name blank.
Is there anybody here who is familiar with javascript and/or selectize.js who would be willing to point me in the right direction?