Options can be added in the next ways:

1. By addOption command:

  var z=new dhtmlXCombo("combo_zone3","alfa3",200);
  z.addOption(value,label,css);
 

• value - value of option
• label - label of option
• css - css string attached to option, optional

It is possible to add few options at once:

  var z=new dhtmlXCombo("combo_zone3","alfa3",200);
  z.addOption([[value,label,css],[value2,label2,css3],[value3,label3,css3]]);
 

2. From XML file:

  var z=new dhtmlXCombo("combo_zone3","alfa3",200);
  z.loadXML("xml/data.xml");

Where XML has the following format:

  <?xml version="1.0" ?>
  <complete>
     <option value="1">one</option>
     <option value="2">two</option>
     <option value="3">three</option>
     <option value="4">four</option>
     <option value="5">five</option>
     <option value="6">six</option>
     <option value="7">seven</option>
     <option value="8">eight</option>
     <option value="9">nine</option>
     <option value="10">ten</option>
  </complete>

Possible attributes of <option> tag are as follows:

• value - option value
• selected - if option is selected
• img_src - icon url (also add the 4th parameter to combobox constructor - “image”)
• checked - checkbox state (for combo with “checkbox” type, 0 by default)

3. From autocomplete xml file

Plese check "filtration" section for more details

4. From HTML in case of converting from existing select box