How to trigger the event when leave current iView

Hi Expert,

We have this common senario: when leave current iView(eg, change the menu, close the window etc) we need to notify user whether they want to save current content or not, but I found wdDoExit(in views or coponent controller) can not be triggered

Is there any event we can use to reside these logic?

Thanks in advance.

Best Regards,

William