Yes, but that's missing the point. Even if you validate server side, having someone being able to submit a freeform text field defeats the purpose of a drop down which is to select pre determined values with text fields. Sure, you don't want bogus data going into the server, but ensuring the data is formatted before the server check is almost always necessary on the front end as well.
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When using a regular dropdown you can still change the option values and submit. Therefore you should always validate server side.
Yes, but that's missing the point. Even if you validate server side, having someone being able to submit a freeform text field defeats the purpose of a drop down which is to select pre determined values with text fields. Sure, you don't want bogus data going into the server, but ensuring the data is formatted before the server check is almost always necessary on the front end as well.