Ruby-on-rails 链接回表单之前访问过的页面
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Link back to page visited before form
提问by user1738017
I have a listing page, then a form, then a thank you page. I need to put a link on the thank you page that takes the user back to the page they were on before the form which always varies. I've tried using this:
我有一个列表页面，然后是一个表格，然后是一个感谢页面。我需要在感谢页面上放一个链接，让用户回到他们在表单之前所在的页面，该页面总是变化的。我试过用这个：
= link_to "Back", :back
But this only takes them back to the previous page, so the form.
但这只会将他们带回上一页，因此表单。
采纳答案by Billy Chan
Well, you can set a method in the form page to collect that url. The basic idea is to use a custom session variable to store previous url and keep it to next session.
好吧，您可以在表单页面中设置一个方法来收集该 url。基本思想是使用自定义会话变量来存储先前的 url 并将其保留到下一个会话。
Suppose your form's action is SomeController#new, then
假设你的表单的 action 是 SomeController#new，那么
class SomeController < ApplicationController
after_filter "save_my_previous_url", only: [:new]
def save_my_previous_url
# session[:previous_url] is a Rails built-in variable to save last url.
session[:my_previous_url] = URI(request.referer || '').path
end
end
Then in the thank you page, you can get this my_previous_urlby
然后在感谢页面中，您可以my_previous_url通过
session[:my_previous_url]
This should be able to suit your case, the previous url two pages ago.
这应该能够适合您的情况，前两页前的网址。
Disclaimer: This is not verified. Idea only.
免责声明：这未经验证。想法而已。
Add
添加
Session belongs to controller. It is not a helper you can use directly in view. You need to define an instance variable in controller and then you can use it in view. Like this
会话属于控制器。它不是您可以直接在视图中使用的助手。您需要在控制器中定义一个实例变量，然后才能在视图中使用它。像这样
# Controller
@back_url = session[:my_previous_url]
# View
<%= link_to "Back", @back_url %>
回答by panicoper
Try this
尝试这个
<%= link_to 'Back', url_for(:back) %>
# if request.env["HTTP_REFERER"] is set to "http://www.example.com"
# => http://www.example.com
回答by ilgam
You can use the example from Rails API:
您可以使用 Rails API 中的示例：
<%= link_to "Back", :back %>
Using a :back Symbol instead of an options hash will generate a link to the referrer (a JavaScript back link will be used in place of a referrer if none exists).
使用 :back 符号而不是选项哈希将生成指向引用者的链接（如果不存在引用者，将使用 JavaScript 反向链接代替引用者）。
回答by Nich
Since you saying,it might be different page before form, probably request_url can help you. you can save your request_url in a param and redirect to param_url if there is.
既然你说，它可能是表单之前的不同页面，可能 request_url 可以帮助你。您可以将 request_url 保存在 param 中，如果有，则重定向到 param_url。
here is a source that you can take for reference. http://programming-tut.blogspot.com/2010/06/ruby-on-rails-request-url.html
这是您可以参考的来源。 http://programming-tut.blogspot.com/2010/06/ruby-on-rails-request-url.html
回答by zw963
If use in Controller, you can direct use like this:
如果在Controller中使用，你可以像这样直接使用：
def some_action
# some code
redirect_to :back
end
回答by Sheldon Hage
This works for me:
这对我有用：
In controller from previous view:
在上一个视图的控制器中：
cookies[:original_referrer] = request.orignal_url
to set a cookie on the browser with the URL of the originating page
使用原始页面的 URL 在浏览器上设置 cookie
In the controller from the current view:
在当前视图的控制器中：
redirect_to cookies[:original_referrer]
