<link href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/3.3.0/js/bootstrap.min.js"></script>
<script src="//code.jquery.com/jquery-1.11.1.min.js"></script>
<div class="form-group">
<label class="col-md-4 control-label" for="rolename">Role Name</label>
<div class="col-md-4">
<select id="dates-field2" class="multiselect-ui form-control" multiple="multiple">
<option value="cheese">Cheese</option>
<option value="tomatoes">Tomatoes</option>
<option value="mozarella">Mozzarella</option>
<option value="mushrooms">Mushrooms</option>
<option value="pepperoni">Pepperoni</option>
<option value="onions">Onions</option>
</select>
</div>
</div>
<script type="text/javascript">
$(document).ready(function() {
$('.multiselect-ui').multiselect({
onChange: function(option, checked) {
var selectedOptions = $('.multiselect-ui option:selected');
if (selectedOptions.length >= 4) {
var nonSelectedOptions = $('.multiselect-ui option').filter(function() {
return !$(this).is(':selected');
});
nonSelectedOptions.each(function() {
var input = $('input[value="' + $(this).val() + '"]');
input.prop('disabled', true);
input.parent('li').addClass('disabled');
});