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[Solved] Expanded Parent Node not set to [-]

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This is a migrated thread and some comments may be shown as answers.

5 Answers, 1 is accepted

answered on 05 Jun 2009, 02:56 PM

Here is the code. as soon as you open the page, you will see that "child_24" is selected and all its parent's child nodes are open. But the parent node still shows "+" sign.

//Design Page:-

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<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>

<%@ Register Assembly="Telerik.Web.UI" Namespace="Telerik.Web.UI" TagPrefix="telerik" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<title>Untitled Page</title>

</head>

<body>

<div>

<asp:ScriptManager runat="server" ID="scriptManager1"></asp:ScriptManager>

<telerik:RadComboBox ID="RadComboBoxPicker" Runat="server" Width="400px" style="vertical-align:text-bottom;">

<telerik:RadTreeView runat="server" ID="RadTreeViewPicker" OnNodeDataBound="RadTreeOnNodeDataBound" Height="400px"></telerik:RadTreeView>

</ItemTemplate>

</telerik:RadComboBox>

</div>

</form>

</body>

</html>

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//Code Behind :-

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using System;

using System.Configuration;

using System.Data;

using System.Linq;

using System.Web;

using System.Web.Security;

using System.Web.UI;

using System.Web.UI.HtmlControls;

using System.Web.UI.WebControls;

using System.Web.UI.WebControls.WebParts;

using System.Xml.Linq;

using Telerik.Web.UI;

public partial class _Default : System.Web.UI.Page

{

protected void Page_Load(object sender, EventArgs e)

{

//form a dataset with the details and expand one node.

if (!IsPostBack)

{

DataTable _dt = GetData();

RadComboBoxPicker.Items.Insert(0, new Telerik.Web.UI.RadComboBoxItem("-- Select --", "-1"));

Telerik.Web.UI.RadTreeView tree = (Telerik.Web.UI.RadTreeView)RadComboBoxPicker.Items[0].FindControl("RadTreeViewPicker");

tree.DataSource = _dt;

tree.DataFieldID = "attribute_id";

tree.DataFieldParentID = "parent_attribute_id";

tree.DataTextField = "attribute_name";

tree.DataValueField = "attribute_id";

tree.DataBind();

ExpandDefaultNode();

}

protected void ExpandDefaultNode()

{

Telerik.Web.UI.RadTreeView tree = (Telerik.Web.UI.RadTreeView)RadComboBoxPicker.Items[0].FindControl("RadTreeViewPicker");

RadTreeNode _node = tree.FindNodeByValue("24");

if (_node != null)

{

_node.Selected = true;

_node.ExpandParentNodes();

RadComboBoxPicker.SelectedItem.Text = _node.Text;

}

protected DataTable GetData()

{

DataTable _dt = new DataTable();

DataColumn _dc1 = new DataColumn("Attribute_Id");

DataColumn _dc2 = new DataColumn("Attribute_Name");

DataColumn _dc3 = new DataColumn("Parent_Attribute_Id");

DataColumn _dc4 = new DataColumn("Has_Children");

_dt.Columns.Add(_dc1);

_dt.Columns.Add(_dc2);

_dt.Columns.Add(_dc3);

_dt.Columns.Add(_dc4);

DataRow _dr = _dt.NewRow();

_dr["Attribute_Id"] = 1;

_dr["Attribute_Name"] = "Parent1";

_dr["Parent_Attribute_Id"] = null;

_dr["Has_Children"] = "Y";

_dt.Rows.Add(_dr);

_dr = _dt.NewRow();

_dr["Attribute_Id"] = 2;

_dr["Attribute_Name"] = "Parent2";

_dr["Parent_Attribute_Id"] = null;

_dr["Has_Children"] = "Y";

_dt.Rows.Add(_dr);

_dr = _dt.NewRow();

_dr["Attribute_Id"] = 3;

_dr["Attribute_Name"] = "Parent3";

_dr["Parent_Attribute_Id"] = null;

_dr["Has_Children"] = "Y";

_dt.Rows.Add(_dr);

for (int _outer = 1; _outer < 4; _outer++)

{

for (int _inner = 1; _inner < 6; _inner++)

{

_dr = _dt.NewRow();

_dr["Attribute_Id"] = _outer*10+_inner;

_dr["Attribute_Name"] = "Child_" + (_outer * 10 + _inner).ToString();

_dr["Parent_Attribute_Id"] = _outer;

_dr["Has_Children"] = "N";

_dt.Rows.Add(_dr);

}

return _dt;

}

protected void RadTreeOnNodeDataBound(object sender, Telerik.Web.UI.RadTreeNodeEventArgs e)

{

if ((((DataRowView)e.Node.DataItem)["Has_Children"]).ToString().Equals("Y"))

{

e.Node.ExpandMode = TreeNodeExpandMode.ServerSideCallBack;

}

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