foldDyn freezes reflex-dom with ghcjs

[reflex-frp]

foldDyn freezes reflex-dom with ghcjs

[ryantrinkle]

Hi @ariep; it would be great to see the full example.

[ariep]

This example illustrates the problem: key presses in the input field do not change the texts.

module Main where
import Reflex.Dom
main :: IO ()
main = mainWidget $ do
  t <- textInput def
  let newItemE = fmap show $ _textInput_keypress t
  el "div" $ do
    dItem <- holdDyn Nothing $ fmap Just newItemE
    dText <- mapDyn show dItem
    dynText dText
  items <- foldDyn (++) "Items:" newItemE
  -- items <- holdDyn "Items: " $ fmap show newItemE
  dynText items
  return ()

It is minimal in the sense that either
• commenting out the 4 lines of the el "div" do-block; or
• swapping in the other definition of items
fixes it.

[ryantrinkle]

That example works for me on the develop branch of try-reflex, in both ghci and ghcjs. The hamishmack-master branch and ghcjs 0.2 haven't been tested with reflex-dom, yet - and it looks as though you may have found an issue with them. Is it possible for you to switch to the develop branch?

[luigy]

That example works fine for me on ghcjs-0.2(compiled from Oct 1). Maybe your compiled ghcjs has a broken base or shims

[ariep]

@luigy I installed a new ghcjs today from git master, and it works now. Thanks!

This is still with the reflex-dom from k0001's repo, because current develop of reflex-dom needs ghcjs-dom < 0.2, but that does not compile with recent ghcjs.

@ryantrinkle I don't feel inclined to downgrade ghcjs, especially given the fact that apparently major bugs are still being fixed (even if older versions of reflex-dom did not trip it up).

[ryantrinkle]

@ariep Glad your issues were resolved! Thanks for the update!