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在我看來代碼:如何創建動態下拉
<%= form_for(:offer,:url=>{:controller=>'offers',:action=>'create'}) do |f| %>
<%= f.label "Select Category:" %> <%= f.select :catId_get, options_from_collection_for_select(@categories, "id", "name"), prompt: "Select Category"%>
<%= f.label "Select Menu" %> <%= f.select :catId_get, options_from_collection_for_select(@menus, "id", "menu_item_name"), prompt: "Select Menu Item"%>
在控制器:
@categories = Category.where(:hotel_id=>cookies[:hotel_id_for_login_user])
@menus = Menu.where(:category_id=>params[:catId_get])
我在rails.I新希望顯示在菜單的下拉菜單推崇當我選擇類別下拉列表。請幫助我。謝謝。
你必須使用'onchange'方法。搜索一下。和一個類似的問題:http://stackoverflow.com/questions/8690516/select-and-onchange-in-a-ruby-on-rails-form – mgh 2014-09-20 09:47:43
可能重複的[連鎖選擇框中的Rails 3](http:///stackoverflow.com/questions/5302470/chained-select-box-in-rails-3) – 2014-09-21 22:15:43