47 lines
1.7 KiB
Racket
47 lines
1.7 KiB
Racket
#lang scheme
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(require web-server/servlet)
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(define interface-version 'v1)
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(define timeout +inf.0)
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(provide start interface-version timeout)
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(define (start initial-request)
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; A top-level frame must exist
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(define counter1 (make-counter))
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(define counter2 (make-counter))
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; counter1 and counter2 must have been added to the top-level frame
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(define include1 (include-counter counter1))
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(define include2 (include-counter counter2))
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; counter1 and counter2 may have been modified
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(send/suspend/dispatch
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(lambda (embed/url)
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; The frame (ref) must have been captured, any changes to web-cells after this will be lost
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`(html
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(body (h2 "Web Cell Test")
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(div (h3 "First")
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,(include1 embed/url))
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(div (h3 "Second")
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,(include2 embed/url)))))))
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(define (make-counter)
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(make-web-cell 0))
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(define (include-counter a-counter)
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; Note: This shouldn't be necessary (but is for testing, not in production)
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(call-with-current-continuation
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(lambda (k)
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(define (generate)
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(k
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(lambda (embed/url)
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`(div (h3 ,(number->string (web-cell-ref a-counter)))
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(a ([href ,(embed/url
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(lambda _
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; A new frame has been created
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(define last (web-cell-ref a-counter))
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; It is a child of the parent frame, so we can inspect the value
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(web-cell-shadow a-counter (add1 last))
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; The new frame has been modified
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(generate)))])
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"+")))))
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(generate))
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servlet-prompt))
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