ghcjsCallback
This project demonstrates how to do a callback from javascript to haskell in ghcjs that returns a value. To build the project you need to have a recent version of ghcjs.
$ ghcjs --version
The Glorious Glasgow Haskell Compilation System for JavaScript, version 0.2.0 (GHC 7.10.3)
To see it in action first compile Main.hs using ghcjs:
ghcjs Main.hs
Then, run a server in Main.jsexe :
cd Main.jsexe
python -m SimpleHTTPServer
Finally, view the results in your brower. helloWorld will be in scope in the browser's console:
>let hi = helloWorld("bob")
Object {helloworld: "hello, bob"}
>helloWorld([] + {})
Object {helloworld: "hello, [object Object]"}
>helloWorld(Array(16).join("wat" - 1) + " Batman!")
Object {helloworld: "hello, NaNNaNNaNNaNNaNNaNNaNNaNNaNNaNNaNNaNNaNNaNNaN Batman!"}
If you just want to see the results, follow the link below: https://dc25.github.io/ghcjsCallback
If you want to see a slightly modified version that runs under node.js, look at the nodejs branch.
NB: index.html loads {lib,rts,out,runmain}.js. If you want a single js lib to load/compile, use all.js.