Handling ResultEvent for data service methods?

Question

I have a dataservice (ds) that makes use of createItem(obj) and deleteItem(obj).  When I call either of these methods, I want to be able to determine which method is being called and then take an action depending on which was performed..
Here's what I'd like to do...
ds.addEventListener(ResultEvent.RESULT, dsHandler);
private function dsHandler(event:ResultEvent):void{
if(<the ds created an object>){
...do this....
} else if(<the ds deleted the object>){
...do something else...
So how can I write this to do as I described above?  I've read a little bit about using tokens, but I'm not sure if this is the direction I need to be going towards.
I saw an example of
private var token:AsyncToken;
token = ds.createItem(obj);
token.kind = "create";
ds.createItem(obj);
and then...
private function dsHandler(event:ResultEvent):void{
if(event.token.kind == "create"){
...do this....
} else if(event.token.kind == "delete"){
...do something else...
This kinda worked for me, except I kept getting an error that said "Item with id 'CEAD6420-6E28-B2B3-10C9-E62770B9BD13' already exists.  Error on destination 'ds' "  Without this code, I get no error.  The weird thing is that it still creates the item even if it reports the error.  So why is this happening?
Any help is appreciated.  thanks!

Answer 1

Hi ,
There are different way to achieve this.One of is
Call your web service  into backing bean and whatever out put will come.Using any java parser parse the XML file.And put your validation and show the message to the user.
Thanks
Prateek