Date Picker

A reasonable date picker for the awesome elm-ui.

At it's core, this date picker is just a Element.Input.text with a few more features.

It also depends on justinmimbs/date to represent dates without time and timezones.

See it in action here.

Usage

It makes the most sense if you look at the simple example and the other examples.

The date picker has an internal Model, but it does hold neither the selected date, nor the text of the underlying Element.Input.text. Therefore your minimal working model looks like this:

type alias Model =
    { date : Maybe Date
    , dateText : String
    , pickerModel : DatePicker.Model
    }

To get a DatePicker.model use the DatePicker.init function. If you want the current day to be highlighted, you have to set it using DatePicker.setToday or use DatePicker.initWithToday

init : ( Model, Cmd Msg )
init =
    ( { date = Nothing
      , dateText = ""
      , pickerModel = DatePicker.init
      }
    , Task.perform SetToday Date.today
    )


update : Msg -> Model -> ( Model, Cmd Msg )
...
    SetToday today ->
    ( { model
        | pickerModel =
            model.pickerModel
                |> DatePicker.setToday today
        }
    , Cmd.none
    )
...

To display the date picker use the DatePicker.input function:

view : Model -> Html Msg
view model =
    Element.layout [ Element.width Element.shrink] <|
        DatePicker.input [Element.centerX, Element.centerY ]
            { onChange = ChangePicker
            , selected = model.date
            , text = model.dateText
            , label =
                Input.labelAbove [] <|
                    Element.text "Pick A Date"
            , placeholder = Nothing
            , settings = DatePicker.defaultSettings
            , model = model.pickerModel
            }

You have to handle both changes to the text and selection of a date:

update : Msg -> Model -> ( Model, Cmd Msg )
update msg model =
    case msg of
        ChangePicker changeEvent ->
            case changeEvent of
                DateChanged date ->
                    -- update both date and text
                    ( { model
                        | date = Just date
                        , dateText = Date.toIsoString date
                      }
                    , Cmd.none
                    )

                TextChanged text ->
                    ( { model
                        | date =
                            -- parse the text in any way you like
                            Date.fromIsoString text
                                |> Result.toMaybe
                                |> Maybe.Extra.orElse model.date
                        , dateText = text
                      }
                    , Cmd.none
                    )

                PickerChanged subMsg ->
                    -- internal stuff changed
                    -- call DatePicker.update
                    ( { model
                        | pickerModel =
                            model.pickerModel
                                |> DatePicker.update subMsg
                      }
                    , Cmd.none
                    )
...

DatePicker.defaultSettings is a reasonable start, just change what you need.

settings : DatePicker.Settings msg
settings =
    let
        default =
            DatePicker.defaultSettings
    in
    { default
        | firstDayOfWeek = Sun
        , disabled =
            \day ->
                Date.weekday day == Sun
    }