RadControls for ASP.NET AJAX To find a Node by Text, Value or Attribute, use the methods FindNodeByText(), FindNodeByValue() and FindNodeByAttribute(). Both RadTreeView and RadTreeView.Nodes has all three methods. In addition, RadTreeView has a FindNodeByUrl() method. For a step by step tutorial on using these find methods see Tutorial: Finding Nodes.
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To use the code examples below, include a reference to Telerik.Web.UI in the "using" (C#) or the "Imports" (VB) section of code. |
FindNodeByText()
The example below searches for a Node with a Text property of "Product Categories".
CopyC#
protected void btnFind_Click(object sender, EventArgs e)
{
RadTreeNode foundNode = RadTreeView1.FindNodeByText("Product Categories");
if (foundNode != null)
{
tbResults.Text = foundNode.Text;
}
}CopyVB.NET
Protected Sub btnFind_Click(ByVal sender As Object, ByVal e As EventArgs)
Dim foundNode As RadTreeNode = RadTreeView1.FindNodeByText("Product Categories")
If foundNode IsNot Nothing Then
tbResults.Text = foundNode.Text
End If
End SubFindNodeByValue()
The example below searches for a Node with a Value property of "1234".
CopyC#
protected void btnFind_Click(object sender, EventArgs e)
{
RadTreeNode foundNode = RadTreeView1.FindNodeByValue("1234");
if (foundNode != null)
{
tbResults.Text = foundNode.Text;
}
}CopyVB.NET
Protected Sub btnFind_Click(ByVal sender As Object, ByVal e As EventArgs)
Dim foundNode As RadTreeNode = RadTreeView1.FindNodeByValue("1234")
If foundNode IsNot Nothing Then
tbResults.Text = foundNode.Text
End If
End SubFindNodeByAttribute()
In the example below several Nodes are added to the RadTreeView. The first Node, "root1" has an attribute added to it. When a button is clicked, the FindNodeByAttribute() method looks for the Node with the identical key and value pair.
CopyC#
using Telerik.Web.UI;
namespace RadControls_NodesFind
{
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
RadTreeNode root1 = new RadTreeNode("root1");
root1.Attributes.Add("My Key", "My Value");
RadTreeView1.Nodes.Add(root1);
RadTreeNode root2 = new RadTreeNode("root2");
root2.Nodes.Add(new RadTreeNode("child1"));
root2.Nodes.Add(new RadTreeNode("child2"));
root2.Nodes.Add(new RadTreeNode("child3"));
RadTreeView1.Nodes.Add(root2);
RadTreeNode root3 = new RadTreeNode("root3");
RadTreeNode child3 = new RadTreeNode("child3");
child3.Nodes.Add(new RadTreeNode("child node under child3"));
root3.Nodes.Add(child3);
RadTreeView1.Nodes.Add(root3);
}
}
protected void btnFind_Click(object sender, EventArgs e)
{
RadTreeNode foundNode = RadTreeView1.FindNodeByAttribute("My Key", "My Value");
if (foundNode != null)
{
tbResults.Text = foundNode.Text;
}
}
}
}CopyVB.NET
Imports Telerik.Web.UI
namespace RadControls_NodesFind
Partial Public Class _Default
Inherits System.Web.UI.Page
Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)
If Not Page.IsPostBack Then
Dim root1 As New RadTreeNode("root1")
root1.Attributes.Add("My Key", "My Value")
RadTreeView1.Nodes.Add(root1)
Dim root2 As New RadTreeNode("root2")
root2.Nodes.Add(New RadTreeNode("child1"))
root2.Nodes.Add(New RadTreeNode("child2"))
root2.Nodes.Add(New RadTreeNode("child3"))
RadTreeView1.Nodes.Add(root2)
Dim root3 As New RadTreeNode("root3")
Dim child3 As New RadTreeNode("child3")
child3.Nodes.Add(New RadTreeNode("child node under child3"))
root3.Nodes.Add(child3)
RadTreeView1.Nodes.Add(root3)
End If
End Sub
Protected Sub btnFind_Click(ByVal sender As Object, ByVal e As EventArgs)
Dim foundNode As RadTreeNode = RadTreeView1.FindNodeByAttribute("My Key", "My Value")
If foundNode IsNot Nothing Then
tbResults.Text = foundNode.Text
End If
End Sub
End Class
End NamespaceSee Also