Rails 控制器和 javascript：不提供所需的重定向结果

Question

我网站的用户可以使用折扣券。如果此优惠券使他们有权获得 100% 的回扣，则它应该为用户更新一些值并通过一条消息重定向到根目录。但是，当前的行为是在提交优惠券/表格后，屏幕上没有任何反应；即，带有表单的页面仍然显示，没有警报消息，没有重定向等。服务器日志显示正在发生操作，但我不明白为什么屏幕上没有任何反应。有人可以请教吗？

用户提交促销代码的表单：

<%= form_for @code, method: :post, url: {action: "checkcode", :controller => 'codes', format: 'js'}, remote: true do |f| %>
  <%= f.submit "Submit Code" %>
  <%= f.text_field :code, :placeholder => "Enter code" %>
  <%= some hidden_fields %>
<% end %>

这将发布到以下 javascript 文件，该文件设置一些值并在屏幕上更新这些值。

alert('<%= @message %>');
<% if @sum %>
    $('.js-sum').val('<%= @sum%>');
    $('.js-hash').val('<%= @hash%>');
    $('.js-sum2').html('<%= number_with_precision(@sum, precision: 2) %>');
<% end %>

控制器方法如下：

def checkcode
  code = Code.active.by_code(params[:code][:name]).first
  # ... some code that checks 'code' and accordingly sets `@sum`... this works
  if @sum && @sum == 0
    @message = "Accepted"
    @organization = Organization.friendly.find(params[:id])
    if @organization.update_attributes(promo_id: code.name,
                            promo_date: Time.zone.now,
                            exp_date: @organization.check_expiration)
      flash.now[:success] = "A confirmation email is sent to you."
      redirect_to root_path
    else
      flash.now[:danger] = "Error"
    end
  end
end

服务器日志：

Started POST "/checkcode.js" 
Processing by CodesController#checkcode as JS
  Parameters: {"utf8"=>"✓", "code"=>{"code"=>"fullrebate"}, "current_sum"=>"100.0", ***, "organization_id"=>"108", "commit"=>"Submit"}
  Code Load (0.9ms)  SELECT  "codes".* FROM "codes" WHERE (expiration >= '2015-07-28') AND (code = 'fullrebate')  ORDER BY "codes"."expiration" DESC LIMIT 1
  Organization Load (0.5ms)  SELECT  "organizations".* FROM "organizations" WHERE "organizations"."tag" = $1  ORDER BY "organizations"."created_at" DESC LIMIT 1  [["tag", "108"]]
  Organization Load (0.6ms)  SELECT  "organizations".* FROM "organizations" WHERE "organizations"."id" = $1  ORDER BY "organizations"."created_at" DESC LIMIT 1  [["id", 108]]
   (0.4ms)  BEGIN
  User Load (0.6ms)  SELECT "users".* FROM "users" WHERE "users"."organization_id" = $1  ORDER BY "users"."username" ASC  [["organization_id", 108]]
  User Exists (0.9ms)  SELECT  1 AS one FROM "users" WHERE (LOWER("users"."email") = LOWER('test23@example.com') AND "users"."id" != 235) LIMIT 1
   (1.0ms)  SELECT "users"."email" FROM "users"  ORDER BY "users"."username" ASC
  User Exists (1.0ms)  SELECT  1 AS one FROM "users" WHERE (LOWER("users"."username") = LOWER('test23') AND "users"."id" != 235) LIMIT 1
  Organization Exists (0.8ms)  SELECT  1 AS one FROM "organizations" WHERE (LOWER("organizations"."name") = LOWER('test23') AND "organizations"."id" != 108) LIMIT 1
  Organization Exists (0.7ms)  SELECT  1 AS one FROM "organizations" WHERE (LOWER("organizations"."tag") = LOWER('tes23') AND "organizations"."id" != 108) LIMIT 1
  SQL (0.6ms)  UPDATE "organizations" SET "expiration" = $1, "updated_at" = $2 WHERE "organizations"."id" = $3  [["expiration", "2020-07-31"], ["updated_at", "2015-07-28 16:10:38.906460"], ["id", 108]]
   (3.7ms)  COMMIT
Redirected to https://homepage.com/
Completed 302 Found in 241ms (ActiveRecord: 11.6ms)

Started GET "/" 
Processing by HomePagesController#home as JS
  Rendered shared/_header.html.erb (53.9ms)
  Rendered shared/_error_messages.html.erb (0.6ms)
  Rendered home_pages/home.html.erb within layouts/application (399.8ms)
  Rendered shared/_shim.html.erb (0.5ms)
  Rendered shared/_footer.html.erb (3.9ms)
Completed 200 OK in 3431ms (Views: 3421.5ms | ActiveRecord: 0.0ms)

因此，一方面服务器日志显示它正在执行控制器方法并进行重定向，但同时在屏幕上什么也没有发生（即，没有转到主页）。 Processing by HomePagesController#home as JS 这行让我觉得很奇怪。 as JS 是否可能是问题的原因以及如何解决？

Answer 1

通过js请求重定向试试这个。

<% if @amount && @amount < 0.01 %> 
  $(window.location.replace("/"))
<% end %> 

alert('<%= @msg %>'); 
<% if @amount %> 
  $('.js-input-amount').val('<%= @amount%>'); 
  $('.js-input-hash').val('<%= @hash%>'); 
  $('.js-text-amount').html('<%= number_with_precision(@amount, precision: 2) %>'); 
<% end %>

Answer 2

这很丑陋，但它有效，将你的操作代码更改为：

def checkcode
  # some code here    
  render js: "window.location = '#{root_path}'"
  # some code here
end

这会直接在客户端渲染js 代码，并将window 位置更改为预期的url（在这种情况下为root_path）。

Answer 3

你应该使用

 redirect_to action: :index

或

redirect_to '/'

而不是

redirect_to root_path

如果这是异步帖子的问题，您可以尝试使用类似的东西

respond_to do |format|
  format.js { :location => path_to_controller_method_url(argument) }
end

在您的控制器中。