There's already a tiny patch in the waiting list that solves that very
problem:
http://dev.rubyonrails.org/ticket/3691
[PATCH] Add frequency and afterupdateelement option to
text_field_with_auto_complete
It justs adds 2 lines in the _auto_complete_field_ method
(java_script_macros_helper.rb)
js_options[:frequency] = "#{options[:frequency]}" if
options[:frequency]
js_options[:afterUpdateElement] = "function(element,value) {
return #{options[:after_update_element]}(element,value); }" if
options[:after_update_element]
Alain
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