1You can apply any one approach:
2
3$("#Input_Id").change(function(){   // 1st
4    // do your code here
5    // When your element is already rendered
6});
7
8
9$("#Input_Id").on('change', function(){    // 2nd (A)
10    // do your code here
11    // It will specifically called on change of your element
12});
13
14$("body").on('change', '#Input_Id', function(){    // 2nd (B)
15    // do your code here
16    // It will filter the element "Input_Id" from the "body" and apply "onChange effect" on it
17});

1$('select option[value=8272]').attr('selected', '');

1    $('#choose').change(function(event) {
2        $.post('info.php', { selected: $('#choose').val() },
3            function(data) {
4                $('#update').html(data);
5            }
6        );            
7    });