ComboBox with AllowCustom is losing keystrokes randomly at normal typing speed

[Jonathan]

This ComboBox, with filtering and custom values enabled, glitches when typing in the box. At a normal typing speed, I'm seeing that about 10% of keystrokes are skipped, or appear briefly and then disappear.

<TelerikComboBox Data="@_data"
                 @bind-Value="@_value"
                 AllowCustom="true"
                 Filterable="true"
                 FilterOperator="@StringFilterOperator.Contains"
                 Enabled="@Enabled"></TelerikComboBox>
...
List<string> _data = new() { "Lorem", "ipsum", "dolor", "sit", "amet", "consectetur", "adipiscing", "elit" };
string _value { get; set; }

 

Dropped letters are slightly less frequent with DebounceDelay="0" ; it's worse with more items in the list. It seems to occur if you type more than 3-4 letters per second.

Also, clicking the cursor in the middle of the text and typing can cause the cursor to jump to the end of the input and jumble your letters around.

 

[Tsvetomir]

Hello Jonathan,

Thank you for the detailed explanation of the behavior you are encountering.

For the same configuration of the ComboBox, there is an already reported bug in our feedback portal: Entering text quickly in the input field leads to the text blinking and becoming partially cleared. Currently, its status is Planned.

You can also subscribe to the public item to receive email notifications for further status updates. Please excuse us for any trouble.

Regards,
Tsvetomir
Progress Telerik

[Jonathan]

Thank you, I did didn't find a ticket searching "TelerikComboBox". This does look like the same problem as described in the MultiColumnComboBox ticket.

[Alexey]

Hi,

When I try to use TelerikComboBox my text is jumping. How to fix it?
Look at example from your resource (https://demos.telerik.com/blazor-ui/combobox/custom-values) :
Link to video: https://drive.google.com/file/d/1k670qruMsfUez5QPN34bjYv2THWPY8Pk/view?usp=sharing

But when i try to use TelerikComboBox for real application with 120 data items, the text jumps even more and use TelerikComboBox for real data absolutely impossible.
Look at real app with TelerikComboBox in action:
https://drive.google.com/file/d/17R9POss9IvMIHITW5FzkyJ8Bh0NQSrkg/view?usp=sharing


My version of the Telerik.UI.for.Blazor is 6.2.0

[Alexey]

Version of my Telerik

[Dimo]

@Alexey - I am afraid we have no reliable workaround for this issue at this point. However, we are already researching for a fix. Please follow the bug report for status updates.

[Alexey]

I have found some permanent solution.
It is increase value of "DebounceDelay".
I set DebounceDelay="1200"
and it make working with TelerikComboBox a little bit smoothly.

But this solution bring other Issue:
"Autocomplete list" of the TelerikComboBox, which appear after my delay "1200" hide my dialog (move to background) which I open during delay time. And it break all flow of the my Application at all.

Do you know how to fix it?

[Dimo]

A large DebounceDelay can leave the impression that the app is stuck, and encourage the user to start clicking randomly. That's why we don't encourage such an approach, unless there is a specific reason and the user is aware.