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ggb/PortExample.elm

Last active May 17, 2016 11:23
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A minimal example of the usage of ports (aka JS-interop) in Elm, featuring incoming and outgoing ports.
Raw
index.html
<html>
<head>
<script type="text/javascript" src="elm.js"></script>
</head>
<body>
</body>
<script>
var component = Elm.fullscreen(Elm.PortsExample, { newData: 0 });
component.ports.outgoing.subscribe(function(val) {
console.log("Elm sagt: ", val);
});
var newValue = function(val) {
component.ports.newData.send(val);
}
</script>
</html>
Raw
PortExample.elm
module PortsExample where
import Graphics.Element exposing (show)
type alias MyModel = ( Int, List Int )
initialModel : MyModel
initialModel = ( 0, [] )
port newData : Signal Int
port outgoing : Signal Int
port outgoing = Signal.map fst update
updateHelper data (current, store) =
(data * data, current :: store)
update = Signal.foldp updateHelper initialModel newData
main = Signal.map show update
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ggb commented May 17, 2016

This is an example that uses Elm v0.16 syntax and works with old-style ports.

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