How to trigger the option selected in select menu ?

How to trigger the option selected in select menu ?

Good morning !

I have a select menu,  I would like to generate a different form depending on the value selected.
I've tried to trigger the value selected doing:

$("#select-Type").bind( "change", function(event, ui) 
{
  alert("Selected"); // for test
});
This don't work, could someone tell me the best way to do it?

Thanks