JSFiddle - React, Tailwind, and code Playground

HTML

<link href="http://ivaynberg.github.com/select2/select2-3.2/select2.css" rel="stylesheet"/>
<script src="http://ivaynberg.github.com/select2/select2-3.2/select2.js"></script>    

<div class="divright">
        <select id="drp_Books_Ill_Illustrations" class="leaderMultiSelctdropdown Books_Illustrations" name="drp_Books_Ill_Illustrations" multiple="">
            <option value=" ">No illustrations</option>
            <option value="a" selected>Illustrations</option>
            <option value="b">Maps</option>
            <option value="c" selected>selectedPortraits</option>
        </select>
</div>

<button class="getValue">Get Value</button>

JavaScript

$(".getValue").click(function() {
    alert($(".leaderMultiSelctdropdown").val());
});