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

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

The button_to_function method’s second argument should be JavaScript,
not
Ruby.

See:
http://api.rubyonrails.org/classes/ActionView/Helpers/JavaScriptHelper.html#method-i-button_to_function

You cannot call Ruby code directly from client side. You have to send an
AJAX request to some controller for this purpose.

Kashif Umair L. wrote in post #1125837:

You cannot call Ruby code directly from client side. You have to send an
AJAX request to some controller for this purpose.

How would I do that? I have no knowledge of AJAX

Suppose you have a controller HomeController. It should look like below.

home_controller.rb

class HomeController < ApplicationController

GET /show_message

def show_message
format.js { render js: “alert(‘simple output’);” }
endend

and in your routs.rb file add this line

get ‘/show_message’, ‘home#show_message’, as: :show_message

and in your view add this line

<%= link_to “Print”, show_message_path, remote: true %>

After this when you click on Print link, and AJAX request will be sent
to
HomeController’sshow_message action and it will display a javascript
alert.

For better understanding of AJAX requests in Rails, follow this tutorial

http://www.tutorialspoint.com/ruby-on-rails/rails-and-ajax.htm :slight_smile:

Thanks a lot!

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