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How to validate text entered for a new node label?

 

Listen to the the NodeEditorValidating event of the TreeViewAdv control to validate the node's label text entered by the user.

The code sample below demonstrates how to prevent blank labels in a node.

C#

private void treeViewAdv1_NodeEditorValidating(object sender, Syncfusion.Windows.Forms.Tools.TreeNodeAdvCancelableEditEventArgs e)

{

if(e.Label.Length == 0)

{

/* Cancel the label edit action, inform the user, and

place the node in edit mode again. */

e.Cancel = true;

MessageBox.Show("The label cannot be blank",

"Node Label Edit");

// To end editing mode,call:

// e.ContinueEditing = false;

}

}

VB

Private Sub treeViewAdv1_NodeEditorValidating(ByVal sender As Object, ByVal e As Syncfusion.Windows.Forms.Tools.TreeNodeAdvCancelableEditEventArgs)

If e.Label.Length = 0 Then

' Cancel the label edit action, inform the user, and

' place the node in edit mode again. */

e.Cancel = True

MessageBox.Show("The label cannot be blank",

"Node Label Edit")

' To end editing mode,call:

' e.ContinueEditing = false;

End If

End Sub

Sample :

http://files.syncfusion.com/support/Tools.Windows/KB/KB_ValidateNodeText/main.htm

Article ID: Published Date: Last Revised Date: Platform: Control:
1226 04/30/2011 07/10/2014 WinForms TreeViewAdv
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