The problem is that the select are created dynamically, then you need to use .on()
.on()
try this:
$(document).on('change','#won',function(){ alert("PROBANDO"); });
This should work, be sure you did not forget $(document).ready(function() {
$(document).ready(function() {
$(document).ready(function() { $('#won').change(function(){ alert( $(this).find("option:selected").attr('value') ); }); });