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http://guides.rubyonrails.org/v3.0.8/action_controller_overview.html#the-flash
如何在頁面顯示controller裡的錯誤提示,
The flash is a special part of the session which is cleared with each request. This means that values stored there will only be available in the next request, which is useful for storing error messages etc. It is accessed in much the same way as the session, like a hash. Let’s use the act of logging out as an example. The controller can send a message which will be displayed to the user on the next request:
flash是session特殊的一部分,每次請求的時候都會被清除,這意味著儲存的資料只有在下一次請求的過程中才有效.這一特性被廣泛的應用於儲存錯誤資訊提示,擷取它的方式與session近似,類似於雜湊.讓我們以退出為例子,controller發送的資訊將在使用者下次請求的時候展示出來.
class LoginsController < ApplicationController def destroy session[:current_user_id] = nil flash[:notice] = "You have successfully logged out" redirect_to root_url endend
Note it is also possible to assign a flash message as part of the redirection.
注意:也可以在頁面重新導向的時候指定flash的資訊
redirect_to root_url, :notice => "You have successfully logged out"
The destroy action redirects to the application’s root_url, where the message will be displayed. Note that it’s entirely up to the next action to decide what, if anything, it will do with what the previous action put in the flash. It’s conventional to display eventual errors or notices from the flash in the application’s layout:
登出登入的操作會使得頁面重新導向到根目錄,這時候資訊也會顯示在頁面上.這完全取決於下一步操作是什麼,總之,上一次請求的資訊將會被存入flash,通常將會把最終的錯誤資訊或者提示資訊展示到頁面上.
<html> <!-- <head/> --> <body> <% if flash[:notice] %> <p class="notice"><%= flash[:notice] %></p> <% end %> <% if flash[:error] %> <p class="error"><%= flash[:error] %></p> <% end %> <!-- more content --> </body></html>
This way, if an action sets an error or a notice message, the layout will display it automatically.
通過這種方式, 如果操作過程中出現的錯誤提示或者通知,會自動的載入到頁面上
If you want a flash value to be carried over to another request, use the keep method:
如果你想把提示資訊帶到其他請求中使用,使用keep方法
class MainController < ApplicationController # Let‘s say this action corresponds to root_url, but you want # all requests here to be redirected to UsersController#index. # If an action sets the flash and redirects here, the values # would normally be lost when another redirect happens, but you # can use ‘keep‘ to make it persist for another request. def index # Will persist all flash values. flash.keep # You can also use a key to keep only some kind of value. # flash.keep(:notice) redirect_to users_url endend
By default, adding values to the flash will make them available to the next request, but sometimes you may want to access those values in the same request. For example, if the create action fails to save a resource and you render the new template directly, that’s not going to result in a new request, but you may still want to display a message using the flash. To do this, you can useflash.now in the same way you use the normal flash:
預設狀態下, flash裡的值會在下一次請求的時候有效, 但是有的時候,你可能希望在同一個請求裡使用這些值,比如建立的時候儲存資料失敗並跳轉到一個新的頁面裡,flash不會出現在這個新的請求裡.如果依然希望通過flash來顯示錯誤資訊,可以直接使用flash.now方法.
class ClientsController < ApplicationController def create @client = Client.new(params[:client]) if @client.save # ... else flash.now[:error] = "Could not save client" render :action => "new" end endend
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Ruby分頁錯誤提示flash
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