frp - Task mixed in a signal -


i send message mailbox inline signal. 

module main  import graphics.element exposing (show) import html             exposing (..) import html.attributes  exposing (..) import html.extra       exposing (..) import signal  import model.picklist   exposing (picklist) import model.babyname.debug debug  headerpane : html headerpane =   header [ id "header" ]   [ text "header" ]  leftpane : signal html leftpane = flip signal.map (.signal picklist) <| \pl ->   ul []   [ li []     [ fromelement << show <| pl ] ]  mainpane : html mainpane =   section [ id "main" ]   [ text "what? what?" ]  layout : signal html layout = flip signal.map leftpane <| \lp ->    div [ id "wrapper" ] <|   [ headerpane   , lp   , mainpane ]  main : signal html main =   (signal.send (.address picklist) debug.dummylist) -- type error   layout

i feel need haskell's >>. these signals (which not monads), , there no do notation or >>= \_ -> kind of madness, neither see lifttask. idea in elm need external input, , cannot send arbitrarily perspective of application? please me understand.

answer

tasks in elm 0.15 executed sending them through port. means task or signal task needs available @ top-level in main module, because that's place can declare port. means cannot send message mailbox in-line (that side-effect), you'll have make sure task can flow through program port definition.

example

import html             exposing (..) import html.attributes  exposing (..) import html.extra       exposing (..) import signal  import model.picklist   exposing (picklist) import model.babyname.debug debug  headerpane : html headerpane =   header [ id "header" ]   [ text "header" ]  leftpane : signal html leftpane = flip signal.map (.signal picklist) <| \pl ->   ul []   [ li []     [ fromelement << show <| pl ] ]  mainpane : html mainpane =   section [ id "main" ]   [ text "what? what?" ]  layout : signal html layout = flip signal.map leftpane <| \lp ->    div [ id "wrapper" ] <|   [ headerpane   , lp   , mainpane ]  port topicklist = signal.send (.address picklist) debug.dummylist  main : signal html main = layout

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