Answers for "auto select and disable menu item from select field based on condition"

disable option dropdown jquery

//disable by value
$("#ddlList option[value='jquery']").attr("disabled","disabled");

//disable by text
$('#ddlList option:contains("HTML")').attr("disabled","disabled");

how to disable css-select select box

.nav-tab-dropdown .cs-select .cs-placeholder {
  pointer-events: none;
}