alert user when leaving route in Ember 2.0

Ok so i have a component i made up with a form. I would like to alert the user that he has unsaved data (if he has) when the user clicks on another link. Now if i would not be tied to ember i would put a flag on a change event and add a window unload listener to show the actual message, However, Since im not really leaving the window this is not getting called.

Is there any Ember event i can attach a handler to? like a change route intent event of some kind

Im interesting in knowing which is the correct event for the leaving route action, not in the something change logic.

ive tried this so far on the didInsertElement( ) method

Ember.$("body").on('unload',()=> alert('it works'));     
Ember.$("window").on('unload',()=> alert('it works'));   
Ember.$("body").on('unload','body'()=> alert('it works'));  

any ideas?