榆木在更新功能中向邮箱发送消息 [英] Elm send message to mailbox in update function

问题描述

我在Elm StartApp MUV框架的更新函数中具有以下Action处理程序。

I've the following Action handler in my update function of Elm StartApp MUV framework.

signupAlertMailbox : Signal.Mailbox String
signupAlertMailbox =
  Signal.mailbox ""

update : Action -> Model -> (Model, Effects Action)
update action model =
  case action of
    Submit ->
      let isInputValid = Dict.foldl (\fieldName fieldState validity -> if validity
                                                                then (fieldState == IsOkay)
                                                                else validity)
                                                                True model.inputState
          rnd = log "Input valid" isInputValid
      -- in (model, Effects.none)
      in if isInputValid
            then (model, Signal.send signupAlertMailbox.address "Oh snap! Change a few things up and try submitting again."
                                |> Effects.task
                                |> Effects.map (always Submit))
            else (model, Signal.send signupAlertMailbox.address "Well done! All input correct!"
                                |> Effects.task
                                |> Effects.map (always Submit))

在提交操作上，我可以在浏览器控制台中看到日志消息，但是没有消息发送到signupAlertMailbox。请帮我解决这个问题。

Upon Submit action, I can see the log message in browser console, but no message is being sent to signupAlertMailbox. Please help me with this issue.

-编辑

StartApp按照下面的注释要求连接代码：

The StartApp wiring up code as requested in comment below:

import StartApp exposing (start)
import Time exposing (every, second)

import Pages.Signup.Model
import Pages.Signup.Update exposing (signupAlertMailbox)
import Pages.Signup.View

app =
  start
    { init = Pages.Signup.Model.init
    , view = Pages.Signup.View.view
    , update = Pages.Signup.Update.update
    , inputs = []
    }

推荐答案

原因是我没有交出应用程序到端口的.tasks将被执行，如Chad Gilbert @ chad-gilbert在上面的评论中所述。谢谢！

The reason was I hadnt handed over the app.tasks to a port for it be executed as mentioned by Chad Gilbert @chad-gilbert in a comment above. Thanks!

我添加了以下部分，并开始通过更新功能在sigupAlertMailbox邮箱中获取这些消息

I added the following section and I started getting those messages in sigupAlertMailbox mailbox from the update function

port tasks : Signal (Task.Task Never ())
port tasks =
  app.tasks

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