Created
January 21, 2018 17:43
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module Nav exposing (view, update, init, subscriptions) | |
import Dom.Scroll as S | |
import Html exposing (Html, div, text) | |
import Html.Attributes exposing (style) | |
import Html.Events exposing (..) | |
import Task | |
import Navigation | |
type alias Model = | |
{ scrollY : Float | |
, activePage : String | |
} | |
type Msg | |
= Scroll ( Float, String ) | |
| ScrollEvent String | |
init : ( Model, Cmd msg ) | |
init = | |
( Model 0 "Home" | |
, Cmd.none | |
) | |
update : Msg -> { a | scrollY : Float } -> ( { a | scrollY : Float }, Cmd Msg ) | |
update msg model = | |
case msg of | |
Scroll ( scrollY, name ) -> | |
( { model | scrollY = scrollY } | |
, Task.attempt | |
(\result -> | |
case result of | |
Ok result -> | |
ScrollEvent name | |
Err error -> | |
ScrollEvent "scroll_error" | |
) | |
(S.toY "scroll-target" scrollY) | |
) | |
ScrollEvent name -> | |
( model, Navigation.newUrl <| "#" ++ name ) | |
subscriptions : a -> Sub msg | |
subscriptions model = | |
Sub.none | |
view : Model -> Html Msg | |
view model = | |
let | |
box = | |
\color scrollY -> | |
div | |
[ style | |
[ ( "width", "100%" ) | |
, ( "height", "400px" ) | |
, ( "background-color", color ) | |
, ( "text-align", "center" ) | |
, ( "padding-top", "200px" ) | |
, ( "font-size", "30px" ) | |
, ( "user-select", "none" ) | |
] | |
, onClick <| Scroll ( scrollY, color ) | |
] | |
[ (text "click me!") ] | |
in | |
div [] | |
[ box "cyan" 600 | |
, box "orange" 1200 | |
, box "red" 0 | |
] | |
<html> | |
<head> | |
</head> | |
<body id="scroll-target"> | |
<div id="app-target"> | |
</div> | |
<script src="elm.js"></script> | |
<script> | |
var app = Elm.Main.embed(document.getElementById("app-target")) | |
</script> | |
</body> | |
</html> |
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module Main exposing (..) | |
import TimeTravel.Html as TimeTravel | |
import Nav exposing (init, view, update, subscriptions) | |
main = | |
TimeTravel.program | |
{ init = init | |
, update = update | |
, view = view | |
, subscriptions = subscriptions | |
} |
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