[Rails] run simple method from Helper on button click

Greetings,
I'm new to rails and currently having couple problems about how to add
javascript functionality into rails.

I have a simple method in the helper and i want to run this code on
button click.

------------------------------------------------------------------
module PagesHelper
def show_message
"simple output"
end
end

------------------------------------------------------------------

this doesnt work
<%= button_to_function "Print", "show_message()" %>

this doesnt work too
<input onclick=" show_message() " type="button" value="PRINT" />

Can someone please show to properly solve this problem? I would really
apreciate it! thank you!

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