Detecting which transfer button was clicked

[Dan]

How can I detect (server side) which transfer button was clicked during a RadListBox "Transferring" event?

I have a RadTreeView in the ItemTemplate of a RadListBox and another RadListBox on the destination side.  I have DragAndDrop and Transfer working both ways except TransferAll from the RadTreeView side does not work.  To Transfer from that side I had to loop through the SelectedNodes from the RadTreeView and I intend to simply set all the Nodes to Selected but how can I detect that the "TransferAll" button was clicked?

Thanks,
Dan

[Yana]

Hello Dan,

I'm not sure I understand your scenario, could you please send us some sample code? Thanks in advance

Best regards,
Yana
the Telerik team

[Dan]

<asp:Panel runat="server" id="pnlUsers" CssClass="fieldPanelPadBottomClearedLeft" style="margin-bottom: 10px;">

    <div style="float: left; width: 325px; vertical-align: middle; margin-left:10px;">
        <asp:Label runat="server" id="Label3"
                    AssociatedControlId="radUserList"
                    Text="Users:" />

        <telerik:RadListBox
            runat="server" ID="radUserList"
            Width="100%" Height="200px"
            SelectionMode="Single"
            AllowTransfer="true"
            TransferToID="radAssignedUserList"
            AutoPostBackOnTransfer="true"
            AllowReorder="false"
            EnableDragAndDrop="true" CssClass="RadListBox1"
            OnTransferring="radUserList_Transferring"
            DataTextField="Name"
            DataValueField="Id">
            <ItemTemplate>
                <telerik:RadTreeView
                    ID="UsersTreeView"
                    Runat="server"
                    EnableViewState="true"
                    EnableDragAndDrop="true"
                    MultipleSelect="true"
                    OnNodeDrop="UsersTreeView_NodeDrop"
                    OnClientNodeDropping="onTreeViewDropping"
                    OnClientMouseOver="onTreeViewMouseOver"
                    OnClientMouseOut="onTreeViewMouseOut"
                    OnClientNodeDragStart="onTreeViewDragStart"
                    OnClientNodeDragging="onTreeViewDragging"
                    EnableDragAndDropBetweenNodes="false"
                    Width="100%"
                    Height="190px">
                    <DataBindings>
                        <telerik:RadTreeNodeBinding
                            TextField="Name"
                            ValueField="Id"
                            ToolTipField="Name"
                            HoveredCssClass="TreeViewDraggableNode" />
                    </DataBindings>
                </telerik:RadTreeView>
            </ItemTemplate>
            <Items>
                <telerik:RadListBoxItem Value="" Text="" AllowDrag="false" />
            </Items>
        </telerik:RadListBox>
    </div>

    <div style="float: left; width: 450px;">
        <asp:Label ID="Label2" runat="server"
                    AssociatedControlId="radAssignedUserList"
                    Text="Users assigned to this Distribution List:" />

        <telerik:RadListBox
            runat="server" ID="radAssignedUserList"
            Width="100%" Height="200px"
            SelectionMode="Multiple"
            AllowReorder="false"
            EnableDragAndDrop="true"
            DataValueField="Id"
            OnClientDropping="onListBoxDropping"
            OnClientDragStart="onListBoxDragStart"
            OnClientMouseOver="onListBoxMouseOver"
            OnClientMouseOut="onListBoxMouseOut"
            OnClientDragging="onListBoxDragging">
            <HeaderTemplate>
                <asp:Label runat="server" Width="200" Text="Name" />
                <asp:Label runat="server" Width="125" Text="Group" />
            </HeaderTemplate>
            <ItemTemplate>
                <asp:Label
                    runat="server" ID="lblUserName"
                    Width="200"
                    Text='<%# DataBinder.Eval(Container.DataItem, "Name")%>' />
                <asp:Label
                    runat="server" ID="lblUserGroup"
                    Width="200"
                    Text='<%# DataBinder.Eval(Container.DataItem, "GroupName")%>' />
            </ItemTemplate>
        </telerik:RadListBox>
    </div>

    <div style="clear: both; padding: 10px; text-align: center;">
        <em>Note:  To move a User or Group, drag to the other window or highlight it and click arrow.<br />(Ctrl + Left-Click to select multiple)</em>
    </div>

</asp:Panel>

Above is the aspx code for the two ListBoxes and the embedded TreeView.  Below is the Transferring method I am using.

protected void radUserList_Transferring(object sender, RadListBoxTransferringEventArgs e)
{
    try
    {
        int distributionListId = 0;
        if (!int.TryParse(txtDistributionListId.Text, out distributionListId))
            return;
        if (distributionListId <= 0)
            return;
        DistributionList selectedDistributionList = new DistributionList(AppSession, distributionListId);
        if (e.SourceListBox == radUserList)
        {
            // If the TransferAll button was clicked, need to set all UserTreeView nodes
            //   to Selected.  So far we haven't found how to determine which button was
            //   clicked so am using combination of no selected nodes in UsersTreeView and
            //   no selected items in radUserList to select all.  ISSUE:  When something
            //   is selected clicking TransferAll, the TransferAll will act just like the
            //   Transfer button and only transfer the selected item(s).
            if (UsersTreeView.SelectedNodes.Count.Equals(0) && radUserList.SelectedItems.Count.Equals(0))
            {
                foreach (RadTreeNode n in UsersTreeView.Nodes)
                {
                    n.Selected = true;
                }
            }
            RadTreeView rtv = (RadTreeView)e.Items[0].FindControl("UsersTreeView");
            foreach (RadTreeNode node in rtv.SelectedNodes)
            {
                if (node.Level != 0)
                {
                    int userId = int.Parse(node.Value);
                    selectedDistributionList.IncludeUser(userId);
                }
                else
                {
                    foreach (RadTreeNode subNode in node.Nodes)
                    {
                        int userId = int.Parse(subNode.Value);
                        selectedDistributionList.IncludeUser(userId);
                    }
                }
            }
            radUserList.Items[0].Selected = false;
        }
        else
        {
            foreach (RadListBoxItem item in e.Items)
            {
                int userId = int.Parse(item.Value);
                selectedDistributionList.RemoveUser(userId);
            }
        }
        e.Cancel = true;
        // bind the parts section
        BindUsers(selectedDistributionList);
    }
    catch (QueCentreException qex)
    {
        lblDistributionListMessage.Text = "Error: " + qex.Message;
        if (qex.InnerException != null)
        {
            lblDistributionListMessage.Text += "<br />Details: " + qex.InnerException.Message;
        }
        lblDistributionListMessage.Visible = true;
        this.Complete(false);
    }
}

Thanks for your help,
Dan

[Yana]

Hello Dan,

Please subscribe to OnClientTransferring event of the first listbox and add the following javascript handler:

<script type="text/javascript">
    function clientTransfering(sender, args) {
        var target = args.get_domEvent().target.parentNode;
        while (target.nodeName != "A")
            target = target.parentNode;
        sender.trackChanges();
        if (target.className.indexOf("rlbTransferFrom") > -1)
            sender.get_items().getItem(0).get_attributes().setAttribute("clickedButton", "transferFrom");
        else if (target.className.indexOf("rlbTransferAllFrom") > -1)
            sender.get_items().getItem(0).get_attributes().setAttribute("clickedButton", "transferAllFrom");
        sender.commitChanges();
   }
 </script>

then you can get the custom attribute in OnTransferring event like this:

String transferButton = (sender as RadListBox).Items[0].Attributes["clickedButton"].ToString();

Hope this helps.

Regards,
Yana
the Telerik team