I apologize on behalf of pedro , the rails community is usually very kind to
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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