[Rails] Catching "keypress" event with observe_field

[Gaël]

I'm desperately trying to update a div when a key is pressed in a text
field.

Eg. :

<input type="text" id="field">
<div id="area"></div>
<%= observe_field :field, :url => {:action => :myAction}, :update =>
:area, :with => "text_param", :on => 'keypress' %>

This does not seem to work, and I can't understand why. Does someone
have any clue on what I am doing wrong ?

Thanks in advance

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