Hi,
I am still trying to get my head around Ocsigen and Eliom. The links I got
last time helped a lot to figure out how to build webservices with
ocsigen. However there are still many occasions, when I get stuck.
Right now I am trying to build a page with a form, that sends the user to
a page generated by the same service. The same service should also be
linked in a navigation area on the page. To do this I am creating the
service, then I the navigation area and finally use some helper functions
to build the page including the navigation. This is a bit like retying the
knot to reduce the problems with recursive function. All this worked
really nice until I tried to add the form to the same page. Once I tried
this I got a really bad type error:
Error: This expression has type
(int * (int * int), unit,
[> `Attached of
Eliom_services.get_attached_service_kind Eliom_services.a_s
]
as 'a, [ `WithSuffix ],
[ `One of int ] Eliom_parameters.param_name *
([ `One of int ] Eliom_parameters.param_name *
[ `One of int ] Eliom_parameters.param_name),
unit, [> `Registrable ])
Eliom_services.service
but an expression was expected of type
(int * (int * int), unit,
[< `Attached of
Eliom_services.get_attached_service_kind Eliom_services.a_s
&
Eliom_services.internal Eliom_services.a_s
| `Nonattached of
[ `Get ] Eliom_services.na_s &
Eliom_services.getpost Eliom_services.na_s ]
as 'b, [< Eliom_services.suff ],
[< int Eliom_parameters.setoneradio ]
Eliom_parameters.param_name *
([< int Eliom_parameters.setoneradio ]
Eliom_parameters.param_name *
[< int Eliom_parameters.setoneradio ]
Eliom_parameters.param_name),
'c, [ `Registrable ])
Eliom_services.service
Type 'a is not compatible with type
'b =
[< `Attached of
Eliom_services.get_attached_service_kind
Eliom_services.a_s &
Eliom_services.internal Eliom_services.a_s
| `Nonattached of
[ `Get ] Eliom_services.na_s &
Eliom_services.getpost Eliom_services.na_s ]
Type
Eliom_services.get_attached_service_kind =
[ `External | `Internal of Eliom_services.servcoserv * [ `Get ]
]
is not compatible with type
Eliom_services.internal =
[ `Internal of Eliom_services.servcoserv *
Eliom_services.getpost ]
The second variant type does not allow tag(s) `External
The reduced code for this example is:
open Lwt
open XHTML.M
open Eliom_services
open Eliom_parameters
open Eliom_sessions
open Eliom_predefmod.Xhtml
let div_with_class klass ?(a = []) l = div ~a:(a_class [klass] :: a) l
let div_with_id id ?(a = []) l = div ~a:(a_id id :: a) l
let make_page navigation htmlhead content =
return (
html
(head htmlhead [])
(body
[div_with_id "navigation" (navigation ());
div_with_id "content" content
]
)
)
let listservice =
new_service
~path:["todos"]
~get_params:(suffix (int "year" ** int "month" ** int "day"))
()
let choose_date service sp =
let form (day,(month,year)) =
[p [int_input ~input_type:`Text ~name:day ();
int_input ~input_type:`Text ~name:month ();
int_input ~input_type:`Text ~name:year ();
string_input ~input_type:`Submit ~value:"Click" ()]]
in
div_with_clas "datechooser"
[
get_form service sp form
]
let make make_service listservice db =
register listservice
(fun sp (year,(month,day)) () ->
let titlestring = Printf.sprintf "Todos für %i.%i.%i" day month
year in
let htmlhead = title (pcdata titlestring) in
let content =
[
h1 [pcdata titlestring];
br ();
choose_date listservice sp
]
in
make_service sp htmlhead content
)
let navigation sp () =
let today = Date.get_today () in
let tomorrow = Date.next_day today in
let yesterday = Date.previous_day today in
[ul ~a:[a_class ["level1"]]
(li [
div_with_class "li"
[pcdata "Todos"];
ul ~a:[a_class ["level2"]]
(li [
div_with_class "li"
[a listservice sp [pcdata "Heute"] (1,(2,3))]
]
)
[]
])
[]
]
let make_service sp htmlhead content =
make_page (navigation sp) htmlhead content
let _ = make make_service listservice
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