To copy nodes from one treeview to another, you should make a clone of the dragged TreeNode (sourceNode) and add it to the Nodes collection of the other treeview. An example is shown below. A hidden field is used indicating whether a node is being moved or copied.
Example:
| ASPX |
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<script type="text/javascript">
function SaveCtrlState(sourceNode, destNode, eventArgs)
{
var hidden = document.getElementById("<%= CtrlKeyField.ClientID %>");
if (eventArgs.ctrlKey)
{
hidden.value = "True";
}
else
{
hidden.value = "False";
}
}
</script>
...
<rad:RadTreeView
ID="RadTreeView1"
runat="server"
DragAndDrop="True"
BeforeClientDrop="SaveCtrlState"
OnNodeDrop="HandleDrop"
ContentFile="tree.xml">
</rad:RadTreeView>
...
<rad:RadTreeView
ID="RadTreeView2"
runat="server"
DragAndDrop="True"
ContentFile="tree.xml">
</rad:RadTreeView>
...
<asp:HiddenField
ID="CtrlKeyField"
runat="server"
Value="False"/>
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| C# |
Copy Code |
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protected void Page_Load(object sender, EventArgs e)
{
if (CtrlKeyField.Value == "False")
{
remove = false;
}
else
{
remove = true;
}
}
protected void HandleDrop(object sender, RadTreeNodeEventArgs e)
{
RadTreeNode sourceNode = e.SourceDragNode;
RadTreeNode destNode = e.DestDragNode;
if (destNode != null)
{
if (sourceNode.TreeView.SelectedNodes.Count <= 1)
{
PerformDragAndDrop(sourceNode, destNode);
}
else if (sourceNode.TreeView.SelectedNodes.Count > 1)
{
foreach (RadTreeNode currentNode in sourceNode.TreeView.SelectedNodes)
{
PerformDragAndDrop(currentNode, destNode);
}
}
destNode.Expanded = true;
}
}
private void PerformDragAndDrop(RadTreeNode sourceNode, RadTreeNode destNode)
{
if (sourceNode.Equals(destNode) || sourceNode.IsAncestorOf(destNode))
{
return;
}
// clone the sourceNode
RadTreeNode sourceNodeClone = CloneNode(sourceNode);
if (remove == false)
{
sourceNode.Owner.Nodes.Remove(sourceNode);
}
// add source node as a child of the destination node
if (!sourceNode.IsAncestorOf(destNode))
{
destNode.Nodes.Add(sourceNodeClone);
}
}
private RadTreeNode CloneNode(RadTreeNode sourceNode)
{
RadTreeNode clonedNode = new RadTreeNode();
clonedNode.Text = sourceNode.Text;
clonedNode.Value = sourceNode.Value;
clonedNode.ImageUrl = sourceNode.ImageUrl;
clonedNode.ImageExpandedUrl = sourceNode.ImageExpandedUrl;
return clonedNode;
}
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| VB.NET |
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Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)
If (CtrlKeyField.Value = "False") Then
remove = false
Else
remove = true
End If
End Sub
Protected Sub HandleDrop(ByVal sender As Object, ByVal e As RadTreeNodeEventArgs)
Dim sourceNode As RadTreeNode = e.SourceDragNode
Dim destNode As RadTreeNode = e.DestDragNode
If (Not (destNode) Is Nothing) Then
If (sourceNode.TreeView.SelectedNodes.Count <= 1) Then
PerformDragAndDrop(sourceNode, destNode)
ElseIf (sourceNode.TreeView.SelectedNodes.Count > 1) Then
For Each currentNode As RadTreeNode In sourceNode.TreeView.SelectedNodes
PerformDragAndDrop(currentNode, destNode)
Next
End If
destNode.Expanded = true
End If
End Sub
Private Sub PerformDragAndDrop(ByVal sourceNode As RadTreeNode, ByVal destNode As RadTreeNode)
If (sourceNode.Equals(destNode) OrElse sourceNode.IsAncestorOf(destNode)) Then
Return
End If
Dim sourceNodeClone As RadTreeNode = CloneNode(sourceNode)
If (remove = false) Then
sourceNode.Owner.Nodes.Remove(sourceNode)
End If
If Not sourceNode.IsAncestorOf(destNode) Then
destNode.Nodes.Add(sourceNodeClone)
End If
End Sub
Private Function CloneNode(ByVal sourceNode As RadTreeNode) As RadTreeNode
Dim clonedNode As RadTreeNode = New RadTreeNode
clonedNode.Text = sourceNode.Text
clonedNode.Value = sourceNode.Value
clonedNode.ImageUrl = sourceNode.ImageUrl
clonedNode.ImageExpandedUrl = sourceNode.ImageExpandedUrl
Return clonedNode
End Function
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