JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css">
<!-- Latest compiled and minified CSS -->
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-select/1.10.0/css/bootstrap-select.min.css">

<!-- Latest compiled and minified JavaScript -->
<script src="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-select/1.10.0/js/bootstrap-select.min.js"></script>
<div class="form-group col-md-4">
    <label for="cSetor">Setor</label>
    <select class="form-control selectpicker" data-live-search="true" title="--" name="tSetor" id="cSetor" multiple>
        <option value="1">setor 1</option>
        <option value="2">setor 2</option>
        <option value="3">setor 3</option>
    </select>
</div>


<div class="form-group col-md-4">
    <label for="cFuncionario">Funcionário</label>
    <select class="form-control selectpicker" data-live-search="true" title="--" name="tFuncionario" id="cFuncionario">
    </select>
</div>

JavaScript

$(document).ready(function() {
    $('#cSetor').on('change', function() {
        alert($(this).val());
        $.post('_require/_jp/jpcarregafuncionario.php', {
            id_fun: $(this).val()
        }, function(res) {
            $('#cFuncionario').html(res).selectpicker('refresh');
        })
    })
})