34 lines
1.2 KiB
Racket
34 lines
1.2 KiB
Racket
#lang web-server
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(define interface-version 'stateless)
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(provide start interface-version)
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;; get-number-from-user: string -> number
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;; ask the user for a number
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(define (gn msg)
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(let ([req
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(send/suspend/hidden
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(lambda (ses-url k-hidden)
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(response/xexpr
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`(html (head (title ,(format "Get ~a number" msg)))
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(body
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(form ([action ,(url->string ses-url)]
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[method "post"]
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[enctype "application/x-www-form-urlencoded"])
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,(format "Enter the ~a number to add: " msg)
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(input ([type "text"] [name "number"] [value ""]))
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(input ([type "submit"]))
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,k-hidden))))))])
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(string->number
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(bytes->string/utf-8
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(binding:form-value
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(bindings-assq #"number"
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(request-bindings/raw req)))))))
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(define (start initial-request)
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(response/xexpr
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`(html (head (title "Final Page"))
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(body
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(h1 "Final Page")
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(p ,(format "The answer is ~a"
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(+ (gn "first") (gn "second"))))))))
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