event in sortable list

Is there any possible way to bind an event when we finish moving a
list in sortable list. I have tried:
$("ul li").bind("mouseup", function(){
var serialStr;
$("ul li").each(function(){
serialStr+= $(this).text();
});
alert(serialStr);
return false; // prevent bubbling
});
but it actually didn't fire any event, anyone can help?