I think this is what you need:

$('.mySpinner').spinner({          
    stop:function(e,ui){
        alert('Triggered after a spin.');
    }
});

See this page for details and more events: http://api.jqueryui.com/spinner/#entry-examples

I think this is what you need:

$('.mySpinner').spinner({          
    stop:function(e,ui){
        alert('Triggered after a spin.');
    }
});

Unlike binding to the click event of the buttons, this will also detect use of the up/down keys on the keyboard.

See this page for details and more events: http://api.jqueryui.com/spinner/#entry-examples