jQuery can't bind event to AJAX loaded element using .on() [duplicate]

Answer 1

on(...) won't subscribe to events that aren't on the page yet without the proper setup. To do what you want, you should try the following:

$(document).on("change", "#subcategory_id", function(){
    alert( 'Success!' );
});

To make this more efficient, you should replace $(document) with the closest parent of the element that you know will be on the page when this code is called.