Accord Dev Team
Top achievements
Rank 1
Accord Dev Team
asked on 16 Apr 2014, 01:35 PM
Hi,
I need to emulate the expand node by lod on demand through js or vb.net code.
Could you help me?
Thanks,
Marcos
I need to emulate the expand node by lod on demand through js or vb.net code.
Could you help me?
Thanks,
Marcos
3 Answers, 1 is accepted
0
Shinu
Top achievements
Rank 2
answered on 17 Apr 2014, 05:35 AM
Hi Horacio Judeikin,
I guess that you want to expand a RadTreeNode which loaded by LoadOnDeamd. You can try the following VB.net Code snippet to expand the RadTreeNode on the Button onClick event.
VB:
Please elaborate your requirement if it doesn't help.
Thanks,
Shinu.
I guess that you want to expand a RadTreeNode which loaded by LoadOnDeamd. You can try the following VB.net Code snippet to expand the RadTreeNode on the Button onClick event.
VB:
Protected
Sub
RadButton1_Click(sender
As
Object
, e
As
EventArgs)
Dim
node
As
RadTreeNode = TryCast(RadTreeView1.Nodes.FindNodeByText(
"Politics"
), RadTreeNode)
node.Expanded =
True
End
Sub
Please elaborate your requirement if it doesn't help.
Thanks,
Shinu.
0
Accord Dev Team
Top achievements
Rank 1
answered on 17 Apr 2014, 05:30 PM
Hi Shinu,
I tried it and it does not work. Only works when the node is clientside.
Any idea?
Thanks,
Marcos
I tried it and it does not work. Only works when the node is clientside.
Any idea?
Thanks,
Marcos
0
Shinu
Top achievements
Rank 2
answered on 19 Apr 2014, 05:38 AM
Hi Horacio Judeikin,
Please have a look into the sample code snippet which works fine at my end. Please try to replicate the problem in this code for further help.
ASPX:
VB:
Thanks,
Shinu.
Please have a look into the sample code snippet which works fine at my end. Please try to replicate the problem in this code for further help.
ASPX:
<
telerik:RadTreeView
ID
=
"RadTreeView1"
runat
=
"server"
Height
=
"300px"
Width
=
"100%"
OnNodeExpand
=
"RadTreeView1_NodeExpand"
>
</
telerik:RadTreeView
>
<
telerik:RadButton
ID
=
"RadButton1"
runat
=
"server"
Text
=
"Expand"
OnClick
=
"RadButton1_Click"
>
</
telerik:RadButton
>
VB:
Protected
Sub
Page_Load(sender
As
Object
, e
As
EventArgs)
If
Not
Page.IsPostBack
Then
LoadRootNodes(RadTreeView1, TreeNodeExpandMode.ServerSideCallBack)
End
If
End
Sub
Protected
Sub
RadTreeView1_NodeExpand(sender
As
Object
, e
As
RadTreeNodeEventArgs)
PopulateNodeOnDemand(e, TreeNodeExpandMode.ServerSideCallBack)
End
Sub
Private
Shared
Sub
PopulateNodeOnDemand(e
As
RadTreeNodeEventArgs, expandMode
As
TreeNodeExpandMode)
Dim
data
As
DataTable = GetChildNodes(e.Node.Value)
For
Each
row
As
DataRow
In
data.Rows
Dim
node
As
New
RadTreeNode()
node.Text = row(
"text"
).ToString()
node.Value = row(
"id"
).ToString()
e.Node.Nodes.Add(node)
Next
e.Node.Expanded =
True
End
Sub
Private
Shared
Function
GetChildNodes(parentId
As
String
)
As
DataTable
Dim
selectCommand
As
New
SqlCommand((Convert.ToString(
"select id,text from Details where parentid='"
) & parentId) +
"'"
)
Return
GetData(selectCommand)
End
Function
Private
Shared
Function
GetData(selectCommand
As
SqlCommand)
As
DataTable
selectCommand.Connection =
New
SqlConnection(ConfigurationManager.ConnectionStrings(
"ConnectionString"
).ConnectionString)
Dim
adapter
As
New
SqlDataAdapter(selectCommand)
Dim
data
As
New
DataTable()
adapter.Fill(data)
Return
data
End
Function
Private
Shared
Sub
LoadRootNodes(treeView
As
RadTreeView, expandMode
As
TreeNodeExpandMode)
Dim
data
As
DataTable = GetData(
New
SqlCommand(
"SELECT * FROM Details WHERE parentid IS NULL"
))
For
Each
row
As
DataRow
In
data.Rows
Dim
node
As
New
RadTreeNode()
node.Text = row(
"text"
).ToString()
node.Value = row(
"id"
).ToString()
node.ExpandMode = expandMode
treeView.Nodes.Add(node)
Next
End
Sub
Protected
Sub
RadButton1_Click(sender
As
Object
, e
As
EventArgs)
Dim
node
As
RadTreeNode = TryCast(RadTreeView1.Nodes.FindNodeByText(
"Politics"
), RadTreeNode)
node.Expanded =
True
End
Sub
Thanks,
Shinu.