JAVASCRIPT

select remove option jquery

$('.ct option').each(function() {
    if ( $(this).val() == 'X' ) {
        $(this).remove();
    }
});

jquery remove items from dropdownlist

<script>
$( ".dropdown" ).change(function() {
  dropdownval = $( ".dropdown" ).val();
  $(".dropdown option[value='dropdownval']").remove();
});
</script>

jquery remove option from select

$("#select-list").empty()