Wire up onActionMsg for route modules.

examples/pokedex/app/Route/TailwindForm.elm

@@ -38,6 +38,7 @@ type alias Model =
 type Msg
     = FormMsg Form.Msg
     | MovedToTop
+    | OnAction ActionData
 
 
 type alias RouteParams =
@@ -558,6 +559,7 @@ route =
             , init = init
             , subscriptions = \_ _ _ _ _ -> Sub.none
             }
+        |> RouteBuilder.withOnAction OnAction
 
 
 action : RouteParams -> Parser (DataSource (Response ActionData ErrorPage))
@@ -583,6 +585,9 @@ update _ _ static msg model =
         MovedToTop ->
             ( model, Effect.none )
 
+        OnAction actionData ->
+            loadActionData (Just actionData)
+
 
 withFlash : Result String String -> ( Model, effect ) -> ( Model, effect )
 withFlash flashMessage ( model, cmd ) =
@@ -594,9 +599,13 @@ init _ _ static =
         _ =
             Debug.log "@@@static.action" static.action
     in
-    ( { form = static.action |> Maybe.map .initialForm |> Maybe.withDefault (Form.init (form defaultUser))
+    loadActionData static.action
+
+
+loadActionData maybeActionData =
+    ( { form = maybeActionData |> Maybe.map .initialForm |> Maybe.withDefault (Form.init (form defaultUser))
       , flashMessage =
-            static.action
+            maybeActionData
                 |> Maybe.map
                     (\actionData ->
                         if Form.hasErrors actionData.initialForm then

generator/src/RouteBuilder.elm

@@ -1,6 +1,7 @@
 module RouteBuilder exposing
     ( StatelessRoute, buildNoState
     , StaticPayload
+    , withOnAction
     , buildWithLocalState, buildWithSharedState
     , preRender, single
     , preRenderWithFallback, serverRender
@@ -38,6 +39,8 @@ We have the following data during pre-render:
 
 @docs StaticPayload
 
+@docs withOnAction
+
 
 ## Stateful Route Modules
 
@@ -119,6 +122,7 @@ type alias StatefulRoute routeParams data action model msg =
     , subscriptions : Maybe PageUrl -> routeParams -> Path -> model -> Shared.Model -> Sub msg
     , handleRoute : { moduleName : List String, routePattern : RoutePattern } -> (routeParams -> List ( String, String )) -> routeParams -> DataSource (Maybe NotFoundReason)
     , kind : String
+    , onAction : Maybe (action -> msg)
     }
 
 
@@ -182,9 +186,18 @@ buildNoState { view } builderState =
             , subscriptions = \_ _ _ _ _ -> Sub.none
             , handleRoute = record.handleRoute
             , kind = record.kind
+            , onAction = Nothing
             }
 
 
+{-| -}
+withOnAction : (action -> msg) -> StatefulRoute routeParams data action model msg -> StatefulRoute routeParams data action model msg
+withOnAction toMsg config =
+    { config
+        | onAction = Just toMsg
+    }
+
+
 {-| -}
 buildWithLocalState :
     { view :
@@ -227,6 +240,7 @@ buildWithLocalState config builderState =
                     config.subscriptions maybePageUrl routeParams path sharedModel model
             , handleRoute = record.handleRoute
             , kind = record.kind
+            , onAction = Nothing
             }
 
 
@@ -265,6 +279,7 @@ buildWithSharedState config builderState =
                     config.subscriptions maybePageUrl routeParams path sharedModel model
             , handleRoute = record.handleRoute
             , kind = record.kind
+            , onAction = Nothing
             }
 
 

generator/src/generate-template-module-connector.js

@@ -562,6 +562,7 @@ config =
         }
         , data = dataForRoute
         , action = action
+        , onActionData = onActionData
         , sharedData = Shared.template.data
         , apiRoutes = ${
           phase === "browser"
@@ -590,6 +591,26 @@ config =
         , notFoundRoute = Nothing
         }
 
+onActionData actionData =
+    let
+        _ = Debug.log "onActionData" actionData
+    in
+    case actionData of
+${templates
+  .map(
+    (name) => `        ActionData${pathNormalizedName(name)} thisActionData ->
+            Route.${name.join(
+              "."
+            )}.route.onAction |> Maybe.map (\\onAction -> onAction thisActionData) |> Maybe.map Msg${pathNormalizedName(
+      name
+    )}
+
+`
+  )
+  .join("\n")}
+
+
+
 globalHeadTags : DataSource (List Head.Tag)
 globalHeadTags =
     (Site.config.head

src/Pages/Internal/Platform.elm

@@ -367,12 +367,14 @@ update config appMsg model =
                     )
 
         UrlChanged url ->
-            let
-                navigatingToSamePage : Bool
-                navigatingToSamePage =
-                    url.path == model.url.path
-            in
-            if navigatingToSamePage then
+            -- TODO is this logic always what we want? This prevents `init` from being called when an action is submitted
+            -- but maybe it's best to avoid calling `pushUrl` in the first place in these cases?
+            if url == model.url then
+                ( model
+                , NoEffect
+                )
+
+            else if url.path == model.url.path then
                 -- this saves a few CPU cycles, but also
                 -- makes sure we don't send an UpdateCacheAndUrl
                 -- which scrolls to the top after page changes.
@@ -489,8 +491,12 @@ update config appMsg model =
                                 | url = newUrl
                                 , pageData = Ok updatedPageData
                             }
+
+                        onActionMsg : Maybe userMsg
+                        onActionMsg =
+                            newActionData |> Maybe.andThen config.onActionData
                     in
-                    case maybeUserMsg of
+                    (case maybeUserMsg of
                         Just userMsg ->
                             ( { updatedModel
                                 | ariaNavigationAnnouncement = mainView config updatedModel |> .title
@@ -519,6 +525,14 @@ update config appMsg model =
                                     NoEffect
                                 ]
                             )
+                    )
+                        |> (case onActionMsg of
+                                Just actionMsg ->
+                                    withUserMsg config actionMsg
+
+                                Nothing ->
+                                    identity
+                           )
 
                 Err _ ->
                     {-

src/Pages/ProgramConfig.elm

@@ -47,6 +47,7 @@ type alias ProgramConfig userMsg userModel route pageData actionData sharedData
     , sharedData : DataSource sharedData
     , data : route -> DataSource (PageServerResponse pageData errorPage)
     , action : route -> DataSource (PageServerResponse actionData errorPage)
+    , onActionData : actionData -> Maybe userMsg
     , view :
         { path : Path
         , route : route