Angular publishing and subscribing to events from other javascript

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AngularJs

Another aspect of integrating angular with an older application that I am hoping to find an elegant solution to is the notion of having existing javascript (really special stuff that we love to maintain and work with) be able to notify an angular viewmodel that it needs to do something, and vice versa. So sometimes the existing lovely javascript may need to tell the angular view that a given item is selected. Other times, the angular viewmodel needs to tell old javascript that a given item is selected.

I am curious if there are any elegant examples of this, or if I should go about blazing my own path. It is certainly solvable, but it would be nice if there is something elegant and quick to implement.

Thanks,

Danny