<form action="">    <div class="form-group">        <label for="js-states">Select State</label>        <select class="js-states form-control" id="js-states">            <option value="AK">Alaska</option>              ...            <option value="WV">West Virginia</option>          </optgroup>        </select>    </div></form><!-- ========== JS ========== --><script>    $(function($) {        $(".js-states").select2();    });</script>                                                    

<form action="">    <div class="form-group">        <label for="js-states-mul">Select Multiple States</label>        <select class="js-states form-control" id="js-states-mul" multiple="multiple">            <option value="AK">Alaska</option>            ...            <option value="WV">West Virginia</option>          </optgroup>        </select>    </div></form><!-- ========== JS ========== --><script>    $(function($) {        $(".js-states").select2();    });</script>                                                    

<form action="">    <div class="form-group">        <label for="js-states">Select State</label>        <select class="js-states-limit form-control" id="js-states" multiple="multiple">            <option value="AK">Alaska</option>              ...            <option value="WV">West Virginia</option>          </optgroup>        </select>    </div></form><!-- ========== JS ========== --><script>    $(function($) {        $(".js-states-limit").select2({            maximumSelectionLength: 2        });    });</script>                                                    

<form action="">    <div class="form-group">        <label for="js-states-mul">Select State</label>        <select class="js-states-hide form-control" id="js-states-mul" >            <option value="AK">Alaska</option>            ...            <option value="WV">West Virginia</option>          </optgroup>        </select>    </div></form><!-- ========== JS ========== --><script>    $(function($) {        $(".js-states-hide").select2({            minimumResultsForSearch: Infinity        });    });</script>