Question

I want to pass collection_select a value with the link_to_remote method. When I did this, I got an internal server error. I am using Rails 2.3.8. My code:

 <%= collection_select("event", "trainer_id", @trainers , :id, :name, {:prompt => 'Select a Trainer'}, {:onchange=> "#{link_to_remote(:url => {:controller => 'events', :action => 'find_new' }, :with=>"'trainer_id='+value")}"}) %>

Added

This my controller code:

def find_new
@trainers= Trainer.all
if ["0"].include?(params[:trainer_id])
    render :partial=>'events/me'
    else
    render :partial=> 'events/something'
    end
end

Answer 1

onchange will expect javascript, you’re providing an HTML a element with your link_to_remote.

I’m guessing you’d want to redirect the user to the page you selected?

<%= collection_select("event", "trainer_id", @trainers , :id, :name, {:prompt => 'Select a Trainer'}, {:onchange=> "redirectToTrainer(this.value)"}) %>

<%= javascript_tag do %>
  function redirectToTrainer(trainerId){
     window.location = "<%= url_for(:controller => 'events', :action => 'find_new') %>?" + trainerId;
  } 
<% end %>

There are cleaner ways to do this, Unobtrusive Javascript for one, but I think that’s what you’re looking for.