I added a custom field called (eng-friendly) as a "Select list" with 4 options:
1=Class is held in English.
2=English summary during the class.
3=You can ask the instructor in English.
4=Instructor doesn't speak English.
BUG1: I disabled GUI filtering, as it doesn't offer the option, but user has to enter the values. (Makes no sense, as he doesn't know the filter options).
BUG2: Anyway, I added the following text in the URL which filtered the list correctly, but if there was no match it returned ALL the events, instead of a blank list.
?cfilter={"eng-friendly":"1"}
I also experanced with a dual filtering, which also works, if there is at least one event for "1" and for "2" as well, otherwise it returns every event again.
?cfilter={"eng-friendly":["1", "2"]}
Can you please have a quick look? THanks a lot!
Cheers,
Marci