[Answer]-Where are the Django controllers?

So I am somewhat confused regarding what you’re looking for here. Are you trying to locate the parcel code coming from Python or the JavaScript/Ajax request that is potentially firing in the drop downs? Sounds to me like an Ajax request is being made once a user selects from the first drop down.

My recommendation is to open Dev Tools-(F12) and view the JS source files. Try to locate the snippet of code that is dealing with the drop downs and set some break points so you can step through the code to see what’s actually happening one line at a time. Hope this helps. Good luck!

The second drop-down is probably being generated by Javascript. In the template for that page check the Javascript files being included. You can also do a global search in your codebase for plotInformation