I wrote a small program as a newbie project in
Elm: https://ellie-app.com/3ynWqjPcP87a1/0.
In this program I calculate the correct input field according to the value
in the model:
view : Model -> Html Msg
view model =
let
toInput attrs =
input attrs []
ageInput =
let
attrs =
if model.age == 0 then
[ name "age", type_ "number", placeholder "Leeftijd in
jaren" ]
else
[ name "age", type_ "number", value (toString
model.age) ]
_ =
Debug.log "Attrs" attrs
in
attrs
|> List.append [ onInput Update ]
|> toInput
in
div [ style [ ( "margin", "100px" ) ] ]
[ div [] [ text "Voer een leeftijd in" ]
, ageInput
, button [ onClick Calculate ] [ text "Bereken" ]
, div [] [ text ("Gewicht: " ++ toString (model.weight) ++ " kg") ]
]
However, if you count up and then down to zero, the input field is rendered
correctly showing the placeholder when age = 0. But when you count down to
negative values, the negative values are shown, although the model.age
value = 0.
Furthermore, the Debug.log "Attrs" is never shown in the debug view.
What am I doing wrong?
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