<div class="ui-widget">
    <input type="text" id="nama_forpromotor" name="nama_promotor" class="form-control">
    <span class="help-block with-errors"></span>
</div>


$( ".ui-widget #nama_forpromotor" ).autocomplete({ source: "/caripromotor", minLength: 2, });

// if not z-indexed, the dropdown doesn't show
.ui-autocomplete { z-index: 99999; }