don't allow transfer on certain item

[appdev]

can i disable transfer function on certain item? in my case, if the item has value of 0 or "" or the item is enabled = false then do not allow transfering on that item. can i do that on client side? please help. thanks.

[Shinu]

Hi Duy,

Try the following clientside code for allowing transferring of items based on condition.

ASPX:

<telerik:RadListBox runat="server" ID="RadListBoxSource" Height="200px" Width="230px"
    OnClientTransferring="OnClientTransferring" AllowTransfer="True" TransferToID="RadListBoxDestination">
    <Items>
        <telerik:RadListBoxItem Text="Argentina" runat="server"   Value="0"/>
        <telerik:RadListBoxItem Text="Australia" runat="server" Value="0" />
        <telerik:RadListBoxItem Text="Brazil" runat="server" Enabled="false" />
        <telerik:RadListBoxItem Text="Canada" runat="server" />
    </Items>
</telerik:RadListBox>
<telerik:RadListBox runat="server" ID="RadListBoxDestination" Height="200px" Width="200px">
</telerik:RadListBox>

JavaScript:

<script type="text/javascript">
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();
            if(text == '0' || text == '' || !args.get_items()[i].get_isEnabled())
            {
                args.set_cancel(true);
                alert('The item cannot be transfered !');
            }
        }
    }
}
</script>

Note: I suggest you to set value as "0" rather than setting as null, because when I tried I am getting the value same as what I provide for text (when I set value as "").

-Shinu.

[appdev]

well, that works great. thank you for that.

But if you hit transfer all button, nothing will get transfer. so how do you prevent that to happen and allow everything transfer over except for header?

[Veselin Vasilev]

Hi Duy,

Here is another idea - cancel the OnClientTransferring event and manually transfer the appropriate items using the transferItem method of RadListBox:

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_text() != "0" && item.get_text() != "") {
            sender.transferItem(item, e.get_sourceListBox(), e.get_destinationListBox());
        }
    }
}

I hope this helps.

Best wishes,
Veselin Vasilev
the Telerik team

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[Arpit]