Posted by kevinquillen on April 7, 2012 at 8:17pm
Earlier this month I wrote a post about how to create custom form field types for the Form API in Drupal 7. The code is currently in use on 3 seperate projects. I also packaged up the code and released it as a module for Drupal called Creditfield:
Check out the article here: Adding Custom Form API Elements to Drupal