How to convert rails request.env to javascript?

Question

I have next js.erb file:

<% if Rails.env == 'production' %>
  <% if request.env['SERVER_NAME'] == 'example.com' %>
    $(function () {
     ...
     ...
    });
  <% end %>
<% end %>

How to convert second line in JavaScript without Ruby?

Answer 1

Output the SERVER_NAME as a string, and do the comparison client-side:

<% if Rails.env == 'production' %>
  if ('<%= request.env['SERVER_NAME'] %>' == 'example.com') {
    $(function () {
     ...
     ...
    });
  }
<% end %>

If the second line can "only contain javascript" (I strongly question this) then you can move the Ruby bit out to a variable:

var serverName = '<%= request.env['SERVER_NAME'] %>';

<% if Rails.env == 'production' %>
  if (serverName == 'example.com') {
    $(function () {
     ...
     ...
    });
  }
<% end %>

Answer 2

I found the answer as:

<% if Rails.env == 'production' %>
 if (window.location.hostname == 'example.com') {
   $(function () {
   ...
   ...
   });
  }
<% end %>