Sending Json.Value over a Port doesn't Work #22

maxsnew · Nov 29, 2014

File

module Main where

import Json.Encode as Json
import Signal
import Text (..)
import Time (..)

port out : Signal Json.Value
port out = Signal.sampleOn (every second) (Signal.constant (Json.object []) )

main = plainText "test"

Compile this to a file main.js and then open this html file:

<!DOCTYPE html>
<html>
<head>
<title>Test</title>
<script src="main.js"></script>
</head>
<body>
<h1>Test</h1>
<div id="bug"></div>

<script type="text/javascript">
 var handler = function(o) { console.log(o) };
var div = document.getElementById('bug');
var test = Elm.embed(Elm.Main, div, { });
test.ports.out.subscribe(handler); 
</script>
</body>
</html>

and get the error:

Initialization Error on port 'out':

    $Native$Json is not defined

Furthermore, adding the necessary $Native$Json = Elm.Native.Json.make(_elm) then results in another error:

Initialization Error on port 'out':

    $Native$Json.toJS is not a function

maxsnew · Nov 29, 2014

Furthermore, adding the necessary $Native$Json = Elm.Native.Json.make(_elm) then results in another error:

Initialization Error on port 'out':

    $Native$Json.toJS is not a function

I think the bug is this line: https://github.com/elm-lang/elm-compiler/blob/92be75c649fe8b5010893c9be30b2ae5177b207a/src/Generate/JavaScript/Ports.hs#L166 it should just return the value as-is since it's already a JS value

maxsnew · Nov 29, 2014

I think the bug is this line: https://github.com/elm-lang/elm-compiler/blob/92be75c649fe8b5010893c9be30b2ae5177b207a/src/Generate/JavaScript/Ports.hs#L166 it should just return the value as-is since it's already a JS value

Thanks for the report and finding the root issue. elm/compiler@530fe17 should fix it. I think there are similar issues lurking in the ports code, so I'm going to add it to my pre-0.14 todo list to go through and check for any more stuff like this.

evancz · Nov 29, 2014

Thanks for the report and finding the root issue. elm/compiler@530fe17 should fix it. I think there are similar issues lurking in the ports code, so I'm going to add it to my pre-0.14 todo list to go through and check for any more stuff like this.

evancz closed this Nov 29, 2014

elm/core

Sending Json.Value over a Port doesn't Work #22

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Sending Json.Value over a Port doesn't Work #22

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