Programmatically close alert() in Javascript [duplicate]

Answer 1

According to my knowledge Java Script Alert box cant be change or close programmatically. So you can use Jquery UI Dialog box or bootstrap model or something else.

Answer 2

As far as I know you cannot close the javascript's alert(); by code. You can try to use alternative notification method like modal window or something (so then if user is back online you can simply use jQuery function to hide/remove the modal box).