Virtualize a Kendo Dropdownlist with local datasource array of strings

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Data Source DropDownList

Lee asked on 17 Nov 2025, 10:47 PM | edited on 17 Nov 2025, 11:05 PM

I have a local array of between 2 and 2000+ strings that I would like to virtualize. For some reason, when I add the valueMapper to the virtual function when there are only 4 items in the array, it causes the user to not be able to click on anything.

Here is a dojo showing what I tried. You can click on a letter and nothing will happen.

https://dojo.telerik.com/oojEQyxf

Neli

commented on 20 Nov 2025, 02:05 PM

Hi Lee,

In order for the virtualization to work as expected, you will need to have dataSource.schema configured. I would suggest you review the following Knowledge Base article where Client Side virtualization in the DropDownList is demonstrated:

- https://www.telerik.com/kendo-jquery-ui/documentation/knowledge-base/dropdownlist-client-side-virtualization

I hope this helps.

Regards,

Neli

Lee

commented on 20 Nov 2025, 02:18 PM | edited

It does not. That article is about virtualizing a local data source. Im going a step more specific and saying I want to virtualize a local data source that is an array of strings, not an array of objects. An array of strings works fine for a dropdown list that is not virtualized but as soon as the value mapper is introduced, it breaks. I provided a Dojo demonstrating.

Virtualize a Kendo Dropdownlist with local datasource array of strings

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