How to talk about external DOM changes

Question

I am using elm 0.17.1 and trying to interact with select2 javascript library (version 4.0.3), here is my Main.elm:

port module Main exposing (..)

import Html exposing (Html,select,option,div,text,br)
import Html.App as App
import Html.Attributes exposing (id,value,width)
-- MODEL

type alias Model =
  {
     country : String
  }


-- UPDATE

type Msg =
      Select String

update : Msg -> Model -> (Model, Cmd Msg)
update msg model =
  case msg of
    Select str -> (Model str,Cmd.none)


-- VIEW

view : Model -> Html Msg
view model =
  div[]
  [
    select [id "myselect"]
    [
     option [value "US"] [text "United States"],
     option [value "UK"] [text "United Kingdom"]
    ],
    text model.country
  ]

-- SUBSCRIPTIONS

port selection : (String -> msg) -> Sub msg

subscriptions : Model -> Sub Msg
subscriptions _=
  selection Select


port issueselect2 : String -> Cmd msg

-- INIT

init : (Model, Cmd Msg)
init =
  ({country=""},issueselect2 "myselect")

main : Program Never
main = App.program {init=init,view=view,update=update,subscriptions=subscriptions}

and javascript side:

$(document).ready(function()
     {
        var app=Elm.Main.fullscreen();
        app.ports.issueselect2.subscribe(function(id)
        {
           $('#'+id).select2().on('change',function(e)
           {
              app.ports.selection.send(e.target.value);
           });
        })
     })

Right now, when I select a country, an error like Uncaught appears in my Chrome console, saying that domNode.replaceDatait is not a function (in fact it is undefined).

The problem is that select2 adds span to the DOM, and Elm is not aware of this, checking domNodeshows that Elm is trying to update spanwhen it should update the text.

I suppose I need effects, but I don’t know how to use them in my particular utility.

How to solve my problem?

, jquery 3, elm main.js, js : jquery.min.js, select2.min.js, main.js, js.

elm-, , js.

Answer 1

, , JavaScript Elm.

:

• Elm
• DOM, Elm's
• $(document).ready(), Elm
• .

:

• index.js - JavaScript select2 bootstrap code

• App.elm - select2

jQuery:

view : Model -> Html Msg
view model =
    div []
        [ text (toString model)
        , div [ id "select2-container" ] [] -- The container, where select2 will live
        ]

, , , .