Adding items from different Listboxes, and then counting them

[Laurence]

I currently have 3 listboxes - Each one contains a "CustomAttr" attribute.

Listbox1.items["CustomAttr"] = 1
Listbox2.items["CustomAttr"] = 2
Listbox3.items["CustomAttr"] = 3

Destination Listbox = DestinationListBox

So when I drag an item from Listbox 1 to DestinationListBox, the item in DestinationListBox will still maintain ["CustomAttr"] = 1 (I believe)

In the OnClientTransferring client event, is it possible to get a count of items in DestinationListBox by attribute? 

The reason I ask is I want to be able to add only 5 items of ["CustomAttr"]  = 1, and ensure that if that is the case from OnClientTransferring, I can cancel the event using args.set_cancel(true);


If anyone has a better way of carrying out this type of function, I would really appreciate the assistance..

Many thanks,
Laurence

[Bozhidar]

Hello,

I've created a sample page demonstrating the described functionality. Feel free to modify it to suit your requirements as needed.

Regards,
Bozhidar
Telerik