new comers.
Rails usually comes with a javascript library, the default is jquery, if you
generate a scaffold you will see it gets imported in the head tag
<%= javascript_include_tag :defaults%>
will import it.
with it you can capture html element via a css selector and attach event to
the element.
http://railscasts.com/episodes/136-jquery
that is an old tutorial but it will get you started.
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