Created
October 30, 2020 23:55
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open! Core_kernel | |
open! Bonsai_web | |
open Bonsai.Let_syntax | |
open Vdom | |
module Model = struct | |
type t = int Int.Map.t [@@deriving sexp, equal] | |
end | |
module Action = struct | |
type t = | |
| New | |
| Update of int * int | |
[@@deriving sexp] | |
end | |
let default_model = Int.Map.empty | |
let apply_action ~inject:_ ~schedule_event:_ model = function | |
| Action.New -> Map.add_exn model ~key:(Map.length model) ~data:0 | |
| Update (location, diff) -> | |
Map.update model location ~f:(Option.value_map ~default:0 ~f:(( + ) diff)) | |
;; | |
let component = | |
let%sub state = | |
Bonsai.state_machine0 [%here] (module Model) (module Action) ~default_model ~apply_action | |
in | |
return | |
@@ let%map state, inject = state in | |
let button text action = | |
Node.button [ Attr.on_click (fun _ -> inject action) ] [ Node.text text ] | |
in | |
let add_button = button "add" New in | |
let for_each i c = | |
Node.div [] [ button "-1" (Update (i, -1)); Node.textf "%d" c; button "+1" (Update (i, 1)) ] | |
in | |
let counters = state |> Map.data |> List.mapi ~f:for_each in | |
Node.div [] (add_button :: counters) | |
;; | |
let _ = Start.start Start.Result_spec.just_the_view ~bind_to_element_with_id:"app" component |
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