jQuery отключить Select
$('#pizza_kind').prop('disabled', false);
Lazy Locust
$('#pizza_kind').prop('disabled', false);//disable by value
$("#ddlList option[value='jquery']").attr("disabled","disabled");
//disable by text
$('#ddlList option:contains("HTML")').attr("disabled","disabled");$("select option:contains('Value b')").attr("disabled","disabled");
$("select option[value='"+ $variable + "']").attr('disabled', true);