Hello, when my application adds items to the auto complete box pragmatically I turn them red. I wish to hide the X button so the user cannot remove them. Is this possible? I noticed there is a ShowRemoveButton property on the control but that seems like it is for all tokens? Here is some of my code. Thank you for the assistance.
Private Sub AddToken(ByVal ac As RadAutoCompleteBox, ByVal email As String)
Dim result As EmailTokenObject = AllEmails.Find(Function(o) o.Email.ToLower = email.ToLower)If result IsNot Nothing Then
Dim flag = False 'search for pre-existing items to make sure we don't add them double
For Each item As RadTokenizedTextItem In ac.Items
If item.Value.ToString.ToLower = email.ToLower Then
flag = True
End If
Exit For
Next
If flag = False Then
'this has to be called BEFORE we add the item to the textbox
PrePopulatedEmails.Add(result.Email) 'add to the prepopulated emails so we can color it in red and remove the ability to remove the item
'add the item
ac.AppendText(result.Name & ";")
End If
End If
End Sub
Private Sub acWatchlist_TokenValidating(sender As Object, e As TokenValidatingEventArgs) Handles acWatchlist.TokenValidating
If acWatchlist.Text.Contains(e.Text) Then
e.IsValidToken = False
End If
End Sub
Private Sub acWatchlist_TextBlockFormatting(sender As Object, e As TextBlockFormattingEventArgs) Handles acWatchlist.TextBlockFormatting
Dim token As TokenizedTextBlockElement = TryCast(e.TextBlock, TokenizedTextBlockElement)
If token IsNot Nothing AndAlso PrePopulatedEmails.Contains(token.Item.Value, StringComparer.OrdinalIgnoreCase) Then
token.GradientStyle = GradientStyles.Solid
token.BackColor = Color.Red
End If
End Sub
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1 Answer, 1 is accepted
Hello Bill,
Thank you for the provided code snippet.
You are right that there is not an easy way to fully prevent the removal of items. Removing the X close button is a good way to prevent the user from removing a token. Now for the Backspace and Delete keys. I have searched for a suitable solution and what I can suggest here is to handle the TextChanging event of the control. Keep in mind that this event will be called for each keystroke. When a token is removed the NewValue property from the event arguments will be an empty string, while the OldValue property will contain the removed token. Using this you can check if the removed token can be removed. Basically, you could create a collection of strings that contains items that can't be removed. Then you can Cancel the event.
private void RadAutoCompleteBox1_TextChanging(object sender, TextChangingEventArgs e)
{
var newValue = e.NewValue;
var oldValue = e.OldValue;
var currentItems = this.radAutoCompleteBox1.Text.Split(new char[] { ';' }, StringSplitOptions.RemoveEmptyEntries);
var itemsThatShouldNotBeRemoved = GetItemsThatShouldNotBeRemoved();
if (e.NewValue == "" && itemsThatShouldNotBeRemoved.Contains(e.OldValue.Replace(";", "")))
{
e.Cancel = true;
}
}You can modify the If clause so that it covers all your scenarios. I hope this approach will work for you.
Regards,
Dinko
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Thank you. I was looking into this last night but I was subscribing to the item collection modified event. I did notice a bug in that event that if you hit the backspace on an item it does not show up in the olditems but if you click the X to remove it does. I will try what you suggest right now and report back.
Private Sub Items_CollectionChanged(ByVal sender As Object, ByVal e As NotifyCollectionChangedEventArgs)If e.NewItems IsNot Nothing Then
For Each itm In e.NewItems
Debug.Print(e.Action.ToString & " " & itm.ToString)
Next
End If
If e.OldItems IsNot Nothing Then
For Each itm In e.OldItems
Debug.Print(e.Action.ToString & " " & itm.ToString)
Next
End If
End Sub
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