Confirm Dialog

A confirm dialog is often used if you want the user to verify or accept something. When a confirm dialog pops up, the user will have to click either "OK" or "Cancel" to proceed.
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onclosing {Function}

Description: Gets or sets a function to invoke before closing the dialog. A false invocation result will prevent the dialog from closing.

Default: undefined

 alertify.confirm('Demo').set({ onclosing:function(){ alertify.message('confirm is about to close.')}}); 


To prevent the dialog from closing, make your callback return false.