# Key.onKeyUp

#### Availability

Flash Player 6.

#### Usage

    someListener.onKeyUp

#### Description

Listener; 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 the `addListener` method to register the listener with the Key object, as in the following:

    someListener = new Object();
    someListener.onKeyUp = function () { ... };
    Key.addListener(someListener);

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

#### See also

`Key.addListener()`