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爲什麼我得到的(重定向/獲取)在這個方案例外:當前延續的標誌:在延續沒有相應的提示:#<繼續提示標籤:網頁>
#lang web-server
(require web-server/formlets web-server/page) (struct app (nm) #:mutable)
(define (start req) (render-main-page req))
此異常功能是由大多數頁面上使用,並通過調用每個給定片的頁面生成功能生成comlete頁xexpr,其中的每一個可以嵌入它們的URL
(define (render-page embed/url a-title blocks)
(response/xexpr `(html (head (title ,a-title)
(body ,@(map (lambda (block) (block embed/url)) blocks))))))
這是一塊第一頁面生成功能的
(define (render-action-panel embed/url action)
`(a ([href ,(embed/url action)]) "New"))
這是
第一頁(define/page (render-main-page)
(local [(define (new-handler req) (render-app-page req (app "new value")))
(define (panel-block embed/url) (render-action-panel embed/url new-handler))]
(render-page embed/url "Title" (list panel-block))))
這是一條第二頁面生成功能(表示形式)
(define (add-app-formlet an-app) (formlet (#%# ,{=> input-string nm}) nm))
(define (render-app-form embed/url an-app save-handler)
`(div (form ([action ,(embed/url save-handler)][method "POST"])
(span ,@(formlet-display (add-app-formlet an-app)))
(span (input ([type "submit"][value "Save"]))))));)
第二種形式, 保存處理程序試圖做-redirect-職位時拋出異常得到
(define/page (render-app-page an-app)
(local [(define (save-handler req)
(render-app-page
(redirect/get)
(set-app-nm! an-app (formlet-process (add-app-formlet an-app) req))))
(define (form-block embed/url)
(render-app-form embed/url an-app save-handler))
]
(render-page embed/url "Title - form: " (list form-block))))
(require web-server/servlet-env)
(serve/servlet start)
我用#lang racket替換了lang (需要web-server/http web-server/formlets web-server/page web-server/servlet) – skazska