If you don't interest in web server stuff I think you can use

Lucid [1] or Hakyll [2].  If I'm not mistaken these libraries are

static sites generators.

To generate JavaScript from Haskell I use GHCJS [3] personally,

but there are also Fay [4] and Haste [5].

[1]: http://hackage.haskell.org/package/lucid

[2]: http://hackage.haskell.org/package/hakyll

[3]: https://github.com/ghcjs

[4]: https://github.com/faylang/fay/wiki

[5]: http://haste-lang.org/