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Parse.elm
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Parse.elm
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module Parse exposing (main)
import Browser
import Html exposing (Html)
import Html.Attributes as Attr
import Dom
main : Program () Value Capture
main =
{ init = { int = Nothing, float = Nothing }
, view = view
, update = update
}
|> Browser.sandbox
-- model type alias
type alias Value =
{ int : Maybe Int
, float : Maybe Float
}
-- message type
type Capture
= ParseInt (Maybe Int)
| ParseFloat (Maybe Float)
-- UPDATE --
update : Capture -> Value -> Value
update capture current =
case capture of
ParseInt maybeInt -> { current | int = maybeInt }
ParseFloat maybeFloat -> { current | float = maybeFloat }
-- VIEW --
view : Value -> Html Capture
view value =
container "Parse.elm"
|> Dom.appendChild (example value)
|> Dom.render
-- main interactive component
example : Value -> Dom.Element Capture
example value =
let
intInput =
Dom.element "div"
|> Dom.appendChild
( inputField "enter an integer"
|> Dom.addClass "my-3"
|> Dom.addInputHandlerWithParser (ParseInt, String.toInt)
)
floatInput =
Dom.element "div"
|> Dom.appendChild
( inputField "enter any number"
|> Dom.addClass "my-3"
|> Dom.addInputHandlerWithParser (ParseFloat, String.toFloat)
)
labelText string =
Dom.element "p"
|> Dom.addClass "my-0"
|> Dom.addStyleList
[ ("line-height", "1em")
, ("min-height", "1em")
]
|> Dom.appendText string
outputText string =
Dom.element "p"
|> Dom.addClass "my-0"
|> Dom.addStyle ("height", "1.5rem")
|> Dom.appendText string
contextClass maybeInt =
case maybeInt of
Nothing -> "secondary"
Just _ -> "success"
groupedFields =
[ ( intInput
, ""
)
, ( labelText "Parsing with String.toInt:"
, "dark"
)
, ( outputText (value.int |> Debug.toString)
, contextClass value.int
)
, ( floatInput
, ""
)
, ( labelText "Parsing with String.toFloat:"
, "dark"
)
, ( outputText (value.float |> Debug.toString)
, contextClass value.float
)
]
|> listGroup
in
Dom.element "div"
|> Dom.addClassList
[ "p-4"
, "text-center"
, "bg-light"
, "rounded"
]
|> Dom.appendChild groupedFields
-- simple reusable components
container : String -> Dom.Element msg
container title =
let
heading =
Dom.element "h1"
|> Dom.addClass "pb-3"
|> Dom.appendText title
in
Dom.element "div"
|> Dom.addClassList
[ "mx-auto"
, "my-4"
, "p-4"
, "border"
, "rounded"
]
|> Dom.addStyleList
[ ("maxWidth", "500px")
, ("height", "550px")
]
|> Dom.appendChild heading
inputField : String -> Dom.Element msg
inputField placeholder =
Dom.element "input"
|> Dom.addClass "form-control"
|> Dom.addAttributeList
[ Attr.type_ "text"
, Attr.placeholder placeholder
]
helpText : String -> Dom.Element msg
helpText context =
Dom.element "small"
|> Dom.addClassList
[ "form-text"
, "text-left"
, "text-" ++ context
]
|> Dom.addStyle ("height", "1em")
listGroup : List (Dom.Element msg, String) -> Dom.Element msg
listGroup items =
let
toGroupItem (content, context) =
Dom.element "li"
|> Dom.addClass "list-group-item"
|> Dom.addClassConditional ("list-group-item-" ++ context) (context /= "")
|> Dom.appendChild content
in
Dom.element "ul"
|> Dom.addClass "list-group"
|> Dom.appendChildList (items |> List.map toGroupItem)