Option Groups

Selectize provides the ability to group options together within the dropdown menu.

Select gear...PitonsCamsNutsBoltsStoppersSlingSkisSkinsPoles

Html

<select id="select-gear" class="demo-default" multiple placeholder="Select gear...">
  <option value="">Select gear...</option>
  <optgroup label="Climbing">
      <option value="pitons">Pitons</option>
      <option value="cams">Cams</option>
      <option value="nuts">Nuts</option>
      <option value="bolts">Bolts</option>
      <option value="stoppers">Stoppers</option>
      <option value="sling">Sling</option>
  </optgroup>
  <optgroup label="Skiing">
      <option value="skis">Skis</option>
      <option value="skins">Skins</option>
      <option value="poles">Poles</option>
  </optgroup>
</select>
        

Javascript

$('#select-gear').selectize({ sortField: 'text' })