How to access Ruby configuration variables from javascript

Question

I added a configuration variable in application.rb such as

module Www
    class Application < Rails::Application
      ...
      config.myurl = "http://localhost:8443/play"
end

After something is clicked on my page I would like to use the value of this config var in order to come up with my full url such as mypage.js having

function ClickedOnSomething(someid){
    var fullUrl = <value of config.myurl> + '?id='+someid+'.html'; 
    ...
}

so that if for example the id of what I clicked on was 1776 then the fullUrl would be the string http://localhost:8443/play?id=1776.html

I am using Ruby on Rails 3.2.3 and Ruby 1.9.3

One thing I tried was going through the controller like the following:

In application_controller.rb I added

def before_filter
  # This variable will be available in all controller actions and views
  @url_global = Www::Application.config.myurl
end

In application.html.erb I added

<script type="text/javascript">
  var url_global = "<%= @url_global %>"
</script>

Then in mypage.js I did

function ClickedOnSomething(someid){
    var fullUrl = @url_global + '?id='+someid+'.html'; 
    ...
}

but @url_global is not recognized. I have actually tried many different variations of using the var in javascript but nothing is working for me.

Nhu Trinh · Accepted Answer · 2012-06-12 18:00:54Z

1

I saw you declare

var url_global = "<%= @url_global %>";

so you have to use url_global in function, not @url_global;

var fullUrl = url_global + '?id='+someid+'.html';

Am I correct?

answered Jun 12, 2012 at 18:00

Nhu Trinh

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3 Comments

snowleopard Over a year ago

I did try it that way without the @ and the variable wasn't being recognized either.

Nhu Trinh Over a year ago

Can you open the rendered page by using view source in your browser? Send me the code it rendered

snowleopard Over a year ago

changing it to url_global without the @ did work after all. I just realized my problem was that in application_controller.rb I had before_filter twice. So I had class ApplicationController < ActionController::Base before_filter :set_cache_buster and then later on I had def before_filter # This variable will be available in all controller actions and views @url_global = Www::Application.config.myurl end So my guess is that the def was being skipped altogether However, I am curious if there is a better way to access config variables in javascript

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