Dynamically Populating Drop Down Lists

Question

Hi,
I am trying to dynamically populate a drop down list on a form based on a selection in another drop down list. I have read the help file "To dynamically populate a second field after populating the first" which goes through an example, however I cannot get this example to work for me.
I know that the best way to do it is to create an xml file and connect the form to this file. I am new to programming in xml but have had some experience in other forms. The code that I have (from the help page) looks like this;
<?xml version="1.0" encoding="UTF-8"?>
<MyData>
   <country/>
   <countries>
      <item uiname="United States" token="US"/>
      <item uiname="Vietnam" token="SRV"/>
   </countries>
   <state/>
   <US>
      <item>California</item>
      <item>New York</item>
      <item>Texas</item>
   </US>
   <SRV>
      <item>An Giang</item>
      <item>Bac Giang</item>
      <item>Bac Kan</item>
   </SRV>
</MyData>
I have then followed the instructions on the page, and am unable to populate either field on my form. Perhaps there is something wrong with my code? Or any other suggestions would be greatly appreciated! 
Thanks

Answer 1

Hi Paul,
I have another question,
I would now like to populate a third drop down menu based on the selection in the second one, however my code is going wrong somewhere as now when I put in the first 2 drop down lists, nothing appears in the second one. ie, the first drop down list I link to countries, and the second to state, as I did with the previous file, but now, when I preview it, I can choose a country, but nothing comes up in state. When I set the first drop down box to countries, I have to specify that I want it to show the uiname, but I can't do that with the second one when I select state using the XML file below, nothing is shown. Where am I going wrong?
<MyData>
   <Country/>
   <countries>
      <item uiname="United States" token="US"/>
      <item uiname="Vietnam" token="SRV"/>
   </countries>  
   <state/>
   <US>
      <item uiname="California" token="CA"/>     
      <item uiname="New York" token="NY"/>   
      <item uiname="Texas" token="TEX"/>
   </US>
   <SRV>
      <item uiname="An Giang" token="AG"/>
      <item uiname="Ban Giang" token="BG"/>
      <item uiname="Bac Kan" token="BK"/>
   </SRV>
   <time/>
   <CA>
      <item>6</item>
      <item>7</item>
   </CA>
   <NY>
      <item>5</item>
      <item>4</item>
   </NY>
   <TEX>
      <item>3</item>
      <item>8</item>
   </TEX>
   <AG>
      <item>2</item>
   </AG>
   <BG>
      <item>1</item>
   </BG>
   <BK>
      <item>9</item>
   </BK>
</MyData>
Thank you for your help!