harvesthq/chosen — pull request #326 by jimlindstrom (2011-10-27 01:40:28+00:00)
Title: Allow users to add their own options

This adds a 'data-allows-new-values' tag. When present, that tag causes the widget to change how it deals with the "no results" condition. It adds an "add" button and responds to the button or [enter] adding the term you searched for.

Demo: http://jimlindstrom.com/extendable_select/example.html