transfermod = copy

[appdev]

so i set transfermode = copy. that works great if i didn't have anything at the start for listbox2. but when i predefine both listboxes like this
listbox1
1
2
3

listbox2
2

it will still transfer 2 over. so how do i get it not too in client side. thank you for your help.

[Veselin Vasilev]

Hello Duy,

Can you please explain in more detail what is the expected behavior?


Best wishes,
Veselin Vasilev
the Telerik team

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Check out the tips for optimizing your support resource searches.

[appdev]

when i first come to the page, i will see two listboxes right
listbox1                          listbox2
1                                
2
3

like that. transfermode is copy. so if you move 2 over and try to move it again, you can't. this is how transfermode = copy works. but if when  i come to the page and it has this

listbox1                   listbox2

1                               2

2

3

 

now if i transfer 2 over, the 2 will still get transfer eventhough there's already a 2 in that listbox2. and the transfermode is copy. so how do i stop that from happening. i hope this is better.thanks

[Veselin Vasilev]

Hello Duy,

I tried to reproduce the problem using this code, but to no avail:

<telerik:RadListBox ID="RadListBox1" runat="server" AllowTransfer="True" Height="150"
    TransferMode="Copy" TransferToID="RadListBox2">
    <Items>
        <telerik:RadListBoxItem runat="server" Text="RadListBoxItem1" />
        <telerik:RadListBoxItem runat="server" Text="RadListBoxItem2" />
        <telerik:RadListBoxItem runat="server" Text="RadListBoxItem3" />
        <telerik:RadListBoxItem runat="server" Text="RadListBoxItem4" />
    </Items>
</telerik:RadListBox>

<telerik:RadListBox runat="server" ID="RadListBox2" Height="150">
    <Items>
        <telerik:RadListBoxItem runat="server" Text="RadListBoxItem2" />
    </Items>
</telerik:RadListBox>

So, when the page loads the second listbox has an item - RadListBoxItem2. If you try to transfer the same item from RadListBox1 - nothing will happen. I am using the official Q2 2009 release.

Am I missing something?

Greetings,
Veselin Vasilev
the Telerik team

Instantly find answers to your questions on the new Telerik Support Portal.
Check out the tips for optimizing your support resource searches.

[appdev]

 function OnClientTransferring(sender, e) {debugger
                //cancel the event
                e.set_cancel(true);

                //manually transfer the appropriate items
                var items = e.get_items();
                for (var i = 0; i < items.length; i++) {
                    var item = items[i];
                    if (item.get_value() != "0" && item.get_value() != "") {
                        sender.transferItem(item, e.get_sourceListBox(), e.get_destinationListBox());
                        if (item.get_value()
                    }
                }
            }

i also have this at the begining too this might cause it to do that. so if i want to keep that function still but disable it to transfer when the item already there. what do i need to do. thanks.

[Shinu]

Hi Duy,

I modified your code in order to achieve the desired functionality. Give a try with the following client side code.

JavaScript:

<script type="text/javascript">
function OnClientTransferring(sender, e)
{
    //cancel the event
    e.set_cancel(true);
    var flag= 0;
    //manually transfer the appropriate items
    var items = e.get_items();
    for (var i = 0; i < items.length; i++)
    {
        var item = items[i];
        var items2 = e.get_destinationListBox().get_items();
        for (var j = 0; j < items2.get_count(); j++)
        {
            var item1 = items2.getItem(j);
            if (item1.get_value() == item.get_value())
            {
              e.set_cancel(true);
              alert('Cannot transfer');
              flag = 1;
            }
        }
        if(flag)
        {
            break;
        }
        if (item.get_value() != "0" && item.get_value() != "")
        {
            sender.transferItem(item, e.get_sourceListBox(), e.get_destinationListBox());
        }
    }
}
</script>

Shinu.

[appdev]

i just found out what the problem is. it was my stupidity for not having the same value when i preloaded the listbox2
but now i run into new problem . with the code below, i can transfer them over by double click, by one at a time button, or by all. however when do all, it transfer everything including item with text = '0' . so i tried to take out the else statment, and that would just not do anything when i click on transfer all button. can you help me with this. thanks

function OnClientTransferring(sender, args)
        {
            if(args.get_items().length >0)
            {
                for(var i=0; i< args.get_items().length; i++ )
                {
                    var text = args.get_items()[i].get_value();
                    alert(text);
                    if(text == '0' || text == '' || !args.get_items()[i].get_isEnabled())
                    {
                        args.set_cancel(true);
                        //alert('The item cannot be transfered !');
                    }
                    else
                    {
                        args.set_cancel(false);
                    }
                }
            }
        }

[appdev]

I THINK I GOT IT. THANKS FOR YOUR HELP