Ruby on Rails - drop down box on change event

Question

I have two drop down boxes in my application. Based on the value selected in 1st combobox, the values in 2nd drop down box should be populated.And these values should come f

Answer 1

This is how I did it. Works in Rails 3.2

View:

<%= select_tag :major_category_select_id, options_from_collection_for_select(@majorcategories, 'id', 'name'), :'data-remote' => 'true', :'data-url' => url_for(:controller => 'listings', :action => 'submit_major_category', format: 'js') %>

Controller method:

def submit_major_category
    @major_category = MajorCategory.find(params[:major_category_select_id])
    @minor_categories = @major_category.minor_categories

    respond_to do |format|
      # format.html { render partial: 'minor_categories_select' }
      format.js
    end
  end

Routes:

get "listings/submit_major_category"

Then create a submit_major_category.js.erb file that gets responded to.