Datasets question

Question

Banging my head against a wall here, need some Datasets help:
<div spry:region="dsSupport">
<select spry:repeatchildren="dsSupport"
spry:choose="choose" name="prodlist"
onChange="dsSupport.setCurrentRow(this.selectedIndex);
dsDownload.setCurrentRow('{dsSupport::row}');">
<option spry:when="{ds_RowNumber} ==
{ds_CurrentRowNumber}"
selected="selected">{listname}</option>
<option
spry:default="default">{listname}</option>
</select>
</div>
Am pretty new to spry data sets and i cannot get this to
work, basically the options list here fills with data drom the
dsSupport dataset, when you change the selected item it changes the
row in that dataset, what i also need it to do is to change the row
in the dsDownload dataset to the row specified in the 'row' colomn
in dsSupport. Does that make sense? Any suggestions anyone?

Answer 1

ok i've now given up on trying to do it within the select box
and i'm going the method of using an observer, i've set the select
box back and that works fine changing the row in dsSupport (page
updates correctly).
I've now put an observer in the heading:
var myObserver = new Object;
myObserver.onCurrentRowChanged = function(dataSet, data)
var line = dsSupport.getCurrentRow();
var data = line["@row"];
dsDownload.setCurrentRow(data);
dsSupport.addObserver(myObserver);
The page continues to change correctly but the other dataset
(dsDownload) still does not change. I changed the code slightly so
i could see what was being passed to it:
var myObserver = new Object;
myObserver.onCurrentRowChanged = function(dataSet, data)
var line = dsSupport.getCurrentRow();
var data = line["@row"];
alert(data);
// dsDownload.setCurrentRow(data);
dsSupport.addObserver(myObserver);
Alert just pops up a message saying 'undefined' leading me to
think its NOT pulling the data from dsSupport.
Can anyone help, i feel i am inches away but just cannot get
there!!