selectpicker in bootstrap code example

Example 1: selectpicker dropdown in bootsttrap

<select class="selectpicker" required multiple>
  <optgroup label="Picnic">
    <option>Mustard</option>
    <option>Ketchup</option>
    <option>Relish</option>
  </optgroup>
  <optgroup label="Camping">
    <option>Tent</option>
    <option>Flashlight</option>
    <option>Toilet Paper</option>
  </optgroup>
</select>

Example 2: select picker bootstrap

$('.ex-disable').click(function () {
  $('.disable-example').prop('disabled', true);
});

$('.ex-enable').click(function () {
  $('.disable-example').prop('disabled', false);
  $('.disable-example').selectpicker('refresh');
});