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December 16, 2021 08:47
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Select Multiple example for Elm language
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| {- authored by https://github.com/lucamug -} | |
| module Main exposing (main) | |
| import Browser | |
| import Html exposing (..) | |
| import Html.Attributes | |
| import Html.Events | |
| import Json.Decode | |
| type alias Model = | |
| { value : List ( String, Maybe String ) } | |
| init : Model | |
| init = | |
| { value = [] } | |
| type Msg | |
| = SetMultipleInts (List ( String, Maybe String )) | |
| update : Msg -> Model -> Model | |
| update msg model = | |
| case msg of | |
| SetMultipleInts value -> | |
| { model | value = value } | |
| view : Model -> Html Msg | |
| view model = | |
| div [] | |
| [ select | |
| [ Html.Events.on "change" | |
| (Json.Decode.map SetMultipleInts targetSelectedOptions) | |
| , Html.Attributes.multiple True | |
| ] | |
| (List.map myOption (List.range 1 4)) | |
| , div [] | |
| [ text <| | |
| Debug.toString | |
| (model | |
| |> .value | |
| |> List.map Tuple.second | |
| |> List.filterMap identity | |
| ) | |
| ] | |
| ] | |
| targetSelectedOptions : Json.Decode.Decoder (List ( String, Maybe String )) | |
| targetSelectedOptions = | |
| Json.Decode.at [ "target", "selectedOptions" ] <| | |
| Json.Decode.keyValuePairs <| | |
| Json.Decode.maybe (Json.Decode.at [ "value" ] Json.Decode.string) | |
| myOption : Int -> Html Msg | |
| myOption id = | |
| option [ Html.Attributes.value (String.fromInt id) ] | |
| [ text <| "Option " ++ String.fromInt id ] | |
| main : Program () Model Msg | |
| main = | |
| Browser.sandbox | |
| { init = init | |
| , view = view | |
| , update = update | |
| } |
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| {- authored by https://github.com/lucamug -} | |
| <html> | |
| <head> | |
| <style> | |
| /* you can style your program here */ | |
| </style> | |
| </head> | |
| <body> | |
| <main></main> | |
| <script> | |
| var app = Elm.Main.init({ node: document.querySelector('main') }) | |
| // you can use ports and stuff here | |
| </script> | |
| </body> | |
| </html> |
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