SubmitForm檢查值不張貼到頁面

Question

我有一個在mypage.html.erb複選框的列表。當我選中一個方框並單擊「提交」按鈕時，我想要在下一頁（bookfinal.html.erb）中選中要打印的內容的值。出於某種原因，檢查的值不打印？在控制檯中，選中的值顯示爲'1'，所以我不確定丟失了什麼。如您所見，我添加了@checked = "Test"以查看該值是否會打印，但它仍然沒有？

mypage.html.erb

<div class="infoheaders">1. Question 
    <%= simple_form_for @category, :url => url_for(:action => 'bookfinal', :controller => 'users'), :method => 'post' do |f| %> 
    <%= f.collection_select(:title, Category.all, :title, :title) %> 
    <div class="grey-text-subheader">Device: (optional)</div> 
    <%= f.check_box :Apple %> <%= f.label "Apple" %> &nbsp; &nbsp; 
    <%= f.check_box :iPhone %> <%= f.label "iPhone" %> &nbsp; &nbsp; 
    <%= f.check_box :iPad %> <%= f.label "iPad" %> &nbsp; &nbsp; 
    <%= f.check_box :Mac %> <%= f.label "Mac" %> &nbsp; &nbsp; 
    <%= f.check_box :Android %> <%= f.label "Android" %><br><br> 
    <%= f.check_box :Samsung %> <%= f.label "Samsung" %> &nbsp; &nbsp; 
    <%= f.check_box :Microsoft %> <%= f.label "Microsoft" %>&nbsp; &nbsp; 
    <%= f.check_box :Windows %> <%= f.label "Windows" %> &nbsp; &nbsp; 
    <%= f.check_box :Google %> <%= f.label "Google" %> 
    <%= f.button :submit, 'Submit' %> 
    <% end %> 
</div> 

users_controller.rb

def bookfinal 
    if params[:category][:ipad].present? 
    @checked = params[:category][:ipad] 
    end 

    if params[:category][:android].present? 
    @checked = params[:category][:android] 
    end 
    if params[:category][:samsung].present? 
    @checked = params[:category][:samsung] 
    end 
    @checked = "Test" 
end 

bookfinal.html.erb

<div> 
    The checked value is <%= @checked %> 
</div> 

的routes.rb

Rails.application.routes.draw do 
    get 'categories/new' 
    get 'sessions/new' 
    post 'categories' => 'categories#create' 
    get 'users/edit' 
    get 'users/new' 
    get 'users/index' 
    get 'users/mypage' 
    post "users/bookfinal" => 'users#bookfinal' 
    resources :users 
    resources :categories 

控制檯

Started POST "https://stackoverflow.com/users/bookfinal" for 96.49.105.234 at 2016-02-19 21:18:21 +0000 
Processing by UsersController#bookfinal as HTML 
    Parameters: {"utf8"=>"✓", "authenticity_token"=>"zaPn5YuBFYr9VwPDSNMeA7tfm74sjM8HZneG+PCX9HEPEH/mb2qgA4xDacI9YDgcjDlFgKCQFFgWnUs5AZB0MA==", "category"=>{"title"=>"Digital Marketing", "Apple"=>"0", "iPhone"=>"0", "iPad"=>"1", "Mac"=>"0", "Android"=>"0", "Samsung"=>"0", "Microsoft"=>"0", "Windows"=>"0", "Google"=>"0"}, "commit"=>"Submit"} 
    Rendered users/bookfinal.html.erb within layouts/application (0.6ms) 
Completed 200 OK in 115ms (Views: 113.8ms | ActiveRecord: 0.0ms) 

Answer 1

更改bookfinal方法的代碼如下：

@checked = params[:category].select{|k,v| !v.to_i.zero?}.keys.join 

Answer 2

對於當前的PARAMS，你可以做這樣的事情：

@checked = params[:category].except(:title).select { |brand, value| value == '1' }.keys.to_sentence 

這將需要從PARAMS [:category]，只留下選擇然後從品牌名稱中作出一個句子。 要選擇什麼時候處理的情況下，你可以使用這個：

@checked = 'None' if @checked.blank? 

有兩種使用形式對象等清潔解決方案，但這應該工作太

Answer 3

你是什麼意思打印值意思？

如果您從params[:category][:ipad]實例中獲得0或1，則所有內容均按預期工作，checkboxes rendered from the form helper return either 0 or 1 if they are unchecked or checked respectively。

你不能獲得複選框標籤文本的方式。請求發送的是html input元素的值，並且由於我發佈的上述鏈接中解釋的原因，rails實際上將其綁定到隱藏字段（保留0或1）。

所以基本上你有兩種選擇：

1. 創建隱藏字段來保存你可以實際發送的請求，併爲您的佔位符下頁或使用此類文本的文本...
2. 只需檢查你的下一個頁面請求的實際值和設定的變量，你再使用，以檢查是否打印出某些標籤

我會去選擇2號，所以你會做些什麼像這樣：

在你的控制器：

def bookfinal 
    if params[:category][:ipad] 
    @ipad_checked = true 
    end 
end 

（你也可以簡單地存儲值上flash storage）

，然後在bookfinal.html.erb觀點：

<div> 
<% if @ipad_checked %> 
<span>iPad is checked</span> 
<% end %> 
</div> 

Answer 4

這裏，從params哈希表，我們一看就知道，在iPad的檢查值是「1」，關鍵是iPad的，而不是iPad的，請更換控制器對此。

def bookfinal 
 
    if params['category']['iPad'].present? 
 
    @checked = 'Ipad is checked' 
 
    end 
 

 
    if params['category']['Apple'].present? 
 
    @checked = 'Apple is checked' 
 
    end 
 
    if params['category']['Samsung'].present? 
 
    @checked = 'Samsung is checked' 
 
    end 
 
    if params['category']['Microsoft'].present? 
 
    @checked = 'Microsoft is checked' 
 
    end 
 
    if params['category']['Android'].present? 
 
    @checked = 'Android is checked' 
 
    end 
 
    if params['category']['Mac'].present? 
 
    @checked = 'Mac is checked' 
 
    end 
 
    if params['category']['iPhone'].present? 
 
    @checked = 'iPhone is checked' 
 
    end 
 
    if params['category']['Windows'].present? 
 
    @checked = 'Windows is checked' 
 
    end 
 
    if params['category']['Google'].present? 
 
    @checked = 'Google is checked' 
 
    end 
 
    @checked = "Test" 
 
end

你bookfinal.html.erb是，

<div> 
 
    <%= @checked %> 
 
</div>

完蛋了。完成:-)

這是您的PARAMS哈希和@Category對象，

params = {"category"=>{"title"=>"Digital Marketing", "Apple"=>"0", "iPhone"=>"0", "iPad"=>"1", "Mac"=>"0", "Android"=>"0", "Samsung"=>"0", "Microsoft"=>"0", "Windows"=>"0", "Google"=>"0"}} 
 

 
if params['category']['iPad'].present? 
 
    @category = "Ipad checked" 
 
    end 
 
=> "Ipad checked" 
 

 
@category 
 
=> "Ipad checked"