Passing parameters to 'remote_function'

Rails
1

Hi,
I am trying to use the ‘remote_function’ helper method from the
PrototypeHelper class on a the onblur event of a text_field for filling
a form with data via AJAX.

How can I get the value of the text_field for making a query to the
database in the controller action?

<%= text_field(“item”, “code” ,
:onblur => remote_function(:update => ‘mydiv’,
:url =>{:action => ‘my_action’})
%>

Is there something like the :with of a observe_field to specify the
parameters for the XMLHttpRequest?

Thanks