Select2
Select2 can take a regular select box. By default it supports all options and operations that are available in a standard select box,but with added flexibility. For more details
Single Select Boxes
<select class="select2-basic-single js-states form-select form-control" name="state" style="width: 100%;">
<option value="AL">Alabama</option>
<option value="Am">Amalapuram</option>
<option value="Arizona">Arizona</option>
<option value="Colorada">Colorada</option>
<option value="Idaho">Idaho</option>
<option value="Montana">Montana</option>
<option value="An">Anakapalli</option>
<option value="Ak">Akkayapalem</option>
<option value="Nebraska">Nebraska</option>
<option value="New Maxico">New Maxico</option>
<option value="North Dakota">North Dakota</option>
<option value="Utah">Utah</option>
<option value="Wyoming">Wyoming</option>
</select>
Multiple Select Boxes
<select class="select2-basic-single js-states form-select form-control" name="states[]" style="width: 100%;">
<optgroup label="pacific Time zone">
<option value="California">California</option>
<option value="Nevada">Nevada</option>
<option value="Oregon">Oregon</option>
<option value="Washington">Washington</option>
</optgroup>
<optgroup label="Mountain Time zone">
<option value="Arizona">Arizona</option>
<option value="Colorada">Colorada</option>
<option value="Idaho">Idaho</option>
<option value="Montana">Montana</option>
<option value="Nebraska">Nebraska</option>
<option value="New Maxico">New Maxico</option>
<option value="North Dakota">North Dakota</option>
<option value="Utah">Utah</option>
<option value="Wyoming">Wyoming</option>
</optgroup>
<optgroup label="Central Time zone">
<option value="Alabama">Alabama</option>
<option value="Arkansas">Arkansas</option>
<option value="Lowa">Lowa</option>
<option value="Kansas">Kansas</option>
<option value="Missouri">Missouri</option>
<option value="Texas">Texas</option>
<option value="South Dakota">South Dakota</option>
<option value="Kentucky">Kentucky</option>
<option value="Illinois">Illinois</option>
</optgroup>
</select>