Last week I found myself looking for a select box that provided a search option. I was trying to find a way to make it easy for a user to find and select an item quickly and autofill/autosuggest was out as an option because of other issues. Sometimes as a UX Designer building wireframes it can be difficult to explain exactly how functionality will work without an example. I decided to find a few good examples of this functionality and also write a demo to try it out myself. The best options that I found were:
I then put together a little example here – http://jsfiddle.net/ChuckJohnstone/5u2xd/.