Text Field & Select Field Combination (Javascript + Rails)

To give you some idea, if you have a Google Account go to GMail and try to add or edit a contact. I am looking to get almost the same exact effect as those text/select fields. It would also be nice if this library also made it ea开发者_运维百科sy to give that Add another option.

If you are pointing to the edit option you get when you click on the contact name, then please look for plugins providing in-place edits. (Example - jeditable)