Using getJSON with a dynamically created element

i have problem with using getJSON using a dynamically created element ,i create a code to add links to the page using jquery, and i can handle their events , their events works fine except for getJSON here's the code :

$('body').on('click', '.save-part', function(e) {

    var csid = $('#id').val();
    var element = $(this).parent().find('.part_id');
    $.getJSON('operations/add.service.php',{csid:x1,part_title:x2},function(data){
        element.text(data);
        $('.add-lesson').show();
     });
    return false;       
});