search for: postcode_string

Hi, I want to know which of the two methods, auto_complete_field and text_field_with_auto_complete best suits what I am trying to do. I have a model class called search (which doen''t extend ActiveRecord) which holds two parameters, category_string and postcode_string. I want my form to bind its values to these to values. I also want the category input to be an auto complete field (after the first three chars have been input). What is the difference between auto_complete_field and text_field_with_auto_complete? Does text_field_with_auto_complete support :...