How to set data attribute for Multiselect dropdown li element

$(itemIdservicetypes).on('change', function (e) {
			// Here we can get the value of selected item
			var seletctedValueST = $(itemIdservicetypes).data("kendoDropDownList").text();
			var data = $(itemIdSIMultiSelect).data("kendoMultiSelect");

			data.ul.children().each(function () {
				if (seletctedValueST == $(this).data("ServiceType") {
					$(this).addClass("k-disabled");
				} else {
					$(this).removeClass("k-disabled");
				}
			})

		});