We have all seen the famous Google Suggestions which was one of the driving factors to the rapid growth of AJAX applications, using real-time auto-completion without refreshing your browser.
Ruby on Rails makes this easy by using script.aculo.us javascript framework. A simple ajax auto-complete field only consists of two lines (with reference to the MVC framework):
#View
<%= text_field_with_auto_complete :model, :attribute %>
#Controller
auto_complete_for :model, :attribute
Viola! You've got yourself a working auto-complete textfield.
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