Is there a workaround to this Autocomplete feature?

Is there a workaround to this Autocomplete feature?

Hello Experts,
 
First, hope it is ok to post a link from another source.
 
On the link below:
 
 
we are very much interested the Standard Select part of the <SELECT>...</SELECT> option for two reasons.
 
1, it allows for autocomplete
2, it is beautifully designed.
 
However, the issue we have run into is that it doesn't work for dynamically populated data.
 
For instance, the code for  SELECT box below, uses ajax call to a webservice to populate the buildingId <SELECT> box
 
  1.           <select name="buildingID" id="buildingID" data-placeholder="Choose a building..." class="chosen-select" style="width:500px;" onchange="getSubCats();">
                <option value=""></option> 
  2.          </select>
You can see data being populated dynamically but you can't see the data via VIEW SOURCE.
 
Obvious reason is because it is populated clientside.
 
Does anyone know if there is a way to modify the js on the link I posted to allow data be displayed?
 
Even better, does anyone know of a link that remotely resembles the Standard Select on the link?
 
Thanks a lot in advance for your assistance.