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#lang web-server
(define interface-version 'stateless)
(provide start interface-version)
(define (start initial-request)
; A top-level frame must exist
(define counter1 (make-counter))
(define counter2 (make-counter))
; counter1 and counter2 must have been added to the top-level frame
(define include1 (include-counter counter1))
(define include2 (include-counter counter2))
; counter1 and counter2 may have been modified
(send/suspend/url/dispatch
(lambda (embed/url)
(response/xexpr
; The frame (ref) must have been captured, any changes to web-cells after this will be lost
`(html
(body (h2 "Web Cell Test")
(div (h3 "First")
,(include1 embed/url))
(div (h3 "Second")
,(include2 embed/url))))))))
(define (make-counter)
(make-web-cell 0))
(define (include-counter a-counter)
(let/cc k
(define (generate)
(k
(lambda (embed/url)
`(div (h3 ,(number->string (web-cell-ref a-counter)))
(a ([href ,(url->string
(embed/url
(lambda _
; A new frame has been created
(define last (web-cell-ref a-counter))
; It is a child of the parent frame, so we can inspect the value
(web-cell-shadow a-counter (add1 last))
; The new frame has been modified
(generate))))])
"+")))))
(generate)))
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