elm-smart-select

A select component written in Elm 0.19

Install

elm install mercurymedia/elm-smart-select

In Action

Single Select

Multi Select

Usage

This package exposes four modules SingleSelect, SingleSelectRemote, MultiSelect and MultiSelectRemote. The Single pickers can be used to pick a single element while the Multi pickers are used to select a list of elements. The pickers without a suffix select from preloaded data whereas the Remote pickers query a remote source. To keep things simple, the documentation here focuses on the SingleSelect. Note: While the basic architecture across all of the modules is similar, certain functions may expect different arguments from one module to the next. Please refer to the specific module documentation for further details and information.

There are 6 steps to configure a SmartSelect:

1. Import the select and add it to your model providing your local Msg type and the datatype of the data to be selected.

import SingleSelect

type alias Product =
    { id : Int
    , name : String
    , price : String
    }

type alias Model =
    { products : List Product
    , select : SingleSelect.SmartSelect Msg Product
    , selectedProduct : Maybe Product
    }

2. Define two Msgs: one to handle updates internal to the select and one to handle receiving a selection from the select.

type Msg
    = HandleSelectUpdate (SingleSelect.Msg Product)
    | HandleSelection ( Product, SingleSelect.Msg )

3. Initialize the select. As noted above, please refer to documentation for the specific arguments that the init function of a particular module takes.

init : ( Model, Cmd Msg )
init =
    ( { products = products
      , select = SingleSelect.init
            { selectionMsg = HandleSelection
            , internalMsg = HandleSelectUpdate
            , idPrefix = "my-prefix"
            }
      , selectedProduct = Nothing
      }
    )

products : List Product
products =
    [ { id = 1
      , name = "product 1"
      , price = "$3.00"
      }
    , { id = 2
      , name = "product 2"
      , price = "$5.00"
      }
    ...
    ]

4. View the select. Call SingleSelect.view.

Each module exposes a .view and .viewCustom function. .view takes only the arguments it needs while providing reasonable defaults for other view related settings. .viewCustom expects all of the fields that can be customized to be provided as arguments. Please refer to the module documentation for more details.

view : Model -> Html Msg
view model =
    div []
        [ ...
        , div
            [ style "width" "500px" ]
            [ SingleSelect.view { selected = model.selectedProduct, options = model.products, optionLabelFn = .name } model.select ]
        ]

5. Update the select. Here is where we handle the Msgs we defined in step 2.

update : Msg -> Model -> ( Model, Cmd Msg )
update msg model =
    case msg of
        ...

        HandleSelectUpdate sMsg ->
            let
                ( updatedSelect, selectCmd ) =
                    SingleSelect.update sMsg model.select
            in
            ( { model | select = updatedSelect }, selectCmd )

        HandleSelection ( product, sMsg ) ->
            let
                ( updatedSelect, selectCmd ) =
                    SingleSelect.update sMsg model.select
            in
            ( { model | selectedProduct = product, select = updatedSelect }, selectCmd )

SingleSelect.upate returns an updated smart select instance and a cmd.

6. Setup the select subscription. The select module uses a subscription to determine when to close (outside of a selection). Wire the picker subscription like below.

subscriptions : Model -> Sub Msg
subscriptions model =
    SingleSelect.subscriptions model.select

Examples

Examples can be found in the examples folder. To view the examples run npm install and npm start. Open your browser at localhost:1234.

CSS

The CSS for smart select is distributed separately and can be found here