onKeyUp = function() {}

Notified when a key is released. To use onKeyUp, you must create a listener object. You can then define a function for onKeyUp and use addListener() to register the listener with the Key object, as shown in the following example:

var keyListener:Object = new Object();
keyListener.onKeyDown = function() {
    trace("DOWN -> Code: "+Key.getCode()+"\tACSII: "+Key.getAscii()+"\tKey: "+chr(Key.getAscii()));
};
keyListener.onKeyUp = function() {
    trace("UP -> Code: "+Key.getCode()+"\tACSII: "+Key.getAscii()+"\tKey: "+chr(Key.getAscii()));
};
Key.addListener(keyListener);

Listeners enable different pieces of code to cooperate because multiple listeners can receive notification about a single event.

See also

addListener (Key.addListener method)