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reflex-dom <body> key handler
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| {-# language PackageImports #-} | |
| import Control.Monad | |
| import "ghcjs-dom" GHCJS.DOM.Document (getBody) | |
| import GHCJS.DOM.EventM (on, preventDefault) | |
| import GHCJS.DOM.GlobalEventHandlers (keyDown) | |
| import Reflex.Dom hiding (preventDefault) | |
| import Web.KeyCode | |
| main :: IO () | |
| main = mainWidget $ do | |
| doc <- askDocument | |
| mbody <- getBody doc | |
| forM_ mbody $ \body -> do | |
| kp <- wrapDomEvent body (`on` keyDown) $ do | |
| preventDefault -- This 'preventDefault' is here to prevent | |
| -- the browser's default behavior when keys | |
| -- like <F1> or the arrow keys are pressed. | |
| -- If you want to preserve default behavior | |
| -- this can be removed, or you can apply it | |
| -- selectively, only to certain keypresses. | |
| i <- getKeyEvent | |
| return i | |
| lastKeyPressed <- holdDyn Nothing $ | |
| Just . keyCodeLookup . fromEnum <$> kp | |
| display lastKeyPressed |
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Revision #2 of this gist has been tested against reflex-platform v0.6.2.0