Asynchronous call issue in JavaScript when click SAVE&CLOSE

Hi Team,

Asynchronous call from JavaScript not working in when user clicked on SAVE&CLOSE.
But working fine on SAVE cliked.
The issue is when user clicked SAVE&CLOSE whole browser closed and hence callback function not executing.
I need to do only in javascript not in workflow/plugin.

Any help is appreciated.

Thanks in Advance,
Nausher