33 lines
1.1 KiB
Racket
33 lines
1.1 KiB
Racket
#lang scheme/base
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(require web-server/servlet
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web-server/managers/timeouts)
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(provide (all-defined-out))
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(define interface-version 'v2)
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(define manager
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(create-timeout-manager
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(lambda _ `(html (body "Expired")))
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360 360))
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; request-number : str -> num
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(define (request-number which-number)
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(string->number
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(extract-binding/single
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'number
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(request-bindings (send/suspend (build-request-page which-number))))))
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; build-request-page : str -> str -> response
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(define (build-request-page which-number)
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(lambda (k-url)
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`(html (head (title "Enter a Number to Add"))
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(body ([bgcolor "white"])
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(form ([action ,k-url] [method "post"])
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"Enter the " ,which-number " number to add: "
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(input ([type "text"] [name "number"] [value ""]))
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(input ([type "submit"] [name "enter"] [value "Enter"])))))))
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(define (start initial-request)
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`(html (head (title "Sum"))
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(body ([bgcolor "white"])
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(p "The answer is "
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,(number->string (+ (request-number "first") (request-number "second")))))))
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