Multiple levels in internet radio via javascript

[Pierre Dumuid]

Hi All,

I've been looking at some of the java script around that add radio 
stations to the Internet Media source.  I'd like to have a deeper tree 
than two-leveled as per most of the scripts. I.E.

Australia Radio Stations
 \- 1. By State
 |   \|-ACT
 |    |   \|-Radio Station 1
 |    |    |-Radio Station 2
 |    |    |-Radio Station 3
 |    |    |-...
 |    |-N.S.W.
 |    |   \|-Radio Station 4
 |    |    |-Radio Station 5
 |    |    |-Radio Station 6
 |    |    |-...
  |    |-Vic.
 |    |-S.A.
 |- 2. Internet only Streams
 |    \|-Radio Station 7
 |     |-Radio Station 8
 |- 3. Local ABC
 |- 4. Network Stations

Reading through the code, I'm not sure if I can do this! (i.e. more than 
1 depth)

 From the numerous javascript samples around, I am guessing that

script.populate.connect( onPopulating );

links tells amarok to call the javascript function "onPopulating" to 
populate the tree. Most implementations have something like:

function onPopulating( level, callbackData, filter )
{
 if (level == 1) {
   // Add the First level items
   item = Amarok.StreamItem;
   item.level = 1;
   item.callbackData =
   ...
   script.insertItem( item );
  } else if (level == 0) {
      for (..loop through source for children from callbackData..) {
         item = Amarok.StreamItem;
         item.level = 0;
         ...
         script.insertItem( item );
      }
 }

So I'm guessing data is filled in is that amarok calls the onPopulate 
with level=1 to get the first level, and then if callbackData exists (or 
not??), it'll call onPopulate again with the callbackData, and with 
level=0 to get the leaf nodes.  If this is the way it works, if the 
level of a leaf of a leaf is -1?  Should the level increase with depth?

I wasn't sure if I'm on the right path, could someone who know's the 
code a little bit enlighten me?

Pierre