Get Selected value from Multi-Value Select Boxes by jquery-select2?

alert("Selected value is: "+$(".leaderMultiSelctdropdown").select2("val"));

alternatively, if you used a regular selectbox as base, you should be able to use the normal jquery call, too:

alert("Selected value is: "+$(".leaderMultiSelctdropdown").val());

both return an array of the selected keys.