$route service should have a beforeunload hook

[groner]

A before(route)unload hook would allow the application to detect unsaved changes and then save them, or prompt the user.

There was a discussion of this on the list, but it looks like an issue was never entered.

https://groups.google.com/d/topic/angular/9k5aFPoz3Ro/discussion

As Unirgy noted, the onChange hook is too late and lacks a mechanism for canceling the navigation.

[mhevery]

This is a duplicate of: #354

[groner]

The onHashSearchChange function sounds promising. I would need to a way to cancel the change from that function.

I think this is a different issue, but I can close it if you still think this is a duplicate.

[IgorMinar]

We are thinking about implementing this via a common event system see: https://groups.google.com/forum/#!topic/angular/i975GJaXNME

[vojtajina]

Closing as we already have $beforeRouteChange and $afterRouteChange events...
For canceling route change, I created separate issue: #592