.js.erb文件中的Rails實例變量

Question

我有一個像這樣的控制器操作。 itineraries_controller.rb

def delete_city 
    @new_itinerary = params[:new_itinerary] if params[:new_itinerary].present? 
    @step = params[:step] 
    if @step == 'two' 
    @city = City.find(params[:id]) 
    @delete_rec = true 
    else 
    @city_item = CityItem.find(params[:id]) rescue nil 
    end 
    if @city_item.present? 
    @itinerary = @city_item.country_item.itinerary rescue nil 
    @itinerary = Itinerary.unscoped.find(params[:data_id]) 
    if (@itinerary.present? and @itinerary.user_id == current_user.id) or (current_user.moderator?) 
     @country_item = @city_item.country_item 
     @city_item.destroy 
     @country_item.update_column('city_ids', @country_item.city_items.order(:sequence).pluck(:city_id)) 
     @delete_rec = true 
    end 
    end 
    respond_to do |format| 
    if @delete_rec && @step != 'two' 
     format.js {render 'step_two.js.erb'} 
    elsif @delete_rec && @step == "two" 
     format.js {render 'delete_city_step_2.js.erb'}  
    else 
     format.js {render :text => 'fail'} 
    end 
    end 
end 

而且js.erb這樣的：

delete_city_step_2.js.erb

a = $('a.cityCrossBtn[for='+"<%= @city %>"+']') 
li = a.closest('.token-input-token-facebook') 
li.hide(); 

我無法找到a元素。什麼是正確的語法？

Answer 1

@city會給你一個ActiveRecord::Base類的實例，我認爲這是你在.js.erb文件中沒有預料到的。你可能會想與該實例像id或name的屬性，你可以通過編寫下面的代碼實現這一目標：

a = $('a.cityCrossBtn[for='+"<%= @city.id %>"+']')