Navi.js

A tiny module for implementing the observer pattern on javascript objects. It creates a single global function (Navi) that augments passed in objects with the following methods:

For listening

• listen(objectToListenTo, nameOfMethodOnListenerToBeCalled)
• unlisten(listenedObject)

For notifying

• notify()
• addListener(listener, nameOfMethodOnListenerToBeCalled)
• removeListener(listener)
• getListeners()
• clearListeners()

Notes

• Listeners are stored in a private member array on the notifying object
• Notify() calls the registered method on each listener of the object and passes the notifying object to each as a parameter.
• Listeners can only have one registered method per notifying object
• If the listen method is called on a pre-registered listener it will update the registered method name if a different one is passed in
• Listeners must be removed from all objects they are registered with before being dereferenced or they will not be garbage collected