Getting a Dynamically generated ID

I have a checkbox where the values are dynamically populated from the data on my database. I would like to perform further queries based on the clicked checkbox, however I cant seem to retrieve the ID whenever I click on any of the checkboxes. I do not want to use a submit button. How can this be achieved??

My code.

function getDBlist() {
            global $link;
            $qry = ("SHOW DATABASES");
            $res = mysqli_query ( $link, $qry );
            while ( $row = mysqli_fetch_assoc ( $res ) ) {
                echo '<input type="checkbox" name="db" id="' . $row ['Database'] . '"   value="' . $row ['Database'] . '" />';
                echo $row ['Database'];
            }
        }
        getDBlist (); 

My Script

$(document).on("change","checkbox", function() {
    var val = $(this).val();
    var id = this.id;
    alert(val, id);
});

When I click on any of the checkboxes I don't get an alert with either the value or the ID. What am I doing wrong here? Could it be because of my dynamically generated ID?