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Radzen DropDown: Collection Disappears After HTTP Call and Filter Not Cleared #294

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opened 2026-01-29 17:34:53 +00:00 by claunia · 0 comments
claunia commented 2026-01-29 17:34:53 +00:00
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Originally created by @pacpoc41 on GitHub (Jan 11, 2022).

Description

The Radzen DropDown has an error where the component itself goes into a state where the contained collection disappears from rendering in the filter, after an HTTP Call.

How to Reproduce

Steps to reproduce the behavior:

  • In a Form, Navigate to a <RadzenDropDown AllowFilter="true" AllowClear="true" Multiple="true"/>.
  • Type into the Filter.
    image
  • Use an HTTP Call to perform the necessary function.
  • Open the Filter.
    image
    • The collection has now disappeared. However, when the Filter predicate has changes the collection is re-rendered.
      image

Expected Behavior

The collection to be filtered needs to be in view of the user at all times.

Environment

  • OS: Windows 10 (v1809+)
  • Browser: Microsoft Edge v 97.0.1072.55
Originally created by @pacpoc41 on GitHub (Jan 11, 2022). <!-- IMPORTANT: Read this first!!! 1. If you own a Radzen Professional or Еnterprise subscription you can report your issue or ask us a question via email at info@radzen.com. Radzen staff will reply within 24 hours (Professional) or 16 hours (Enterprise) 2. The Radzen staff guarantees a response to issues in this repo only to paid subscribers. 3. If you have a HOW TO question start a new forum thread in the Radzen Community forum: https://forum.radzen.com. Radzen staff will close issues that are HOWTO questions. 4. Please adhere to the issue template. Specify all the steps required to reproduce the issue or link a project which reproduces it easily (without requiring extra steps such as restoring a database). --> ## Description The Radzen DropDown has an error where the component itself goes into a state where the contained collection disappears from rendering in the filter, after an HTTP Call. ## How to Reproduce #### Steps to reproduce the behavior: - In a Form, Navigate to a ```<RadzenDropDown AllowFilter="true" AllowClear="true" Multiple="true"/>```. - Type into the Filter. ![image](https://user-images.githubusercontent.com/97504897/148914464-8e7d966f-4fa0-4576-82e3-5dc294734293.png) - Use an HTTP Call to perform the necessary function. - Open the Filter. ![image](https://user-images.githubusercontent.com/97504897/148915388-c351d516-ab4a-4e6e-99cb-50e53e009f07.png) - The collection has now disappeared. However, when the Filter predicate has changes the collection is re-rendered. ![image](https://user-images.githubusercontent.com/97504897/148915665-3cacd324-7cd2-4a9d-9f99-2cfb0d679f2f.png) ## Expected Behavior The collection to be filtered needs to be in view of the user at all times. ## Environment - OS: Windows 10 \(v1809+\) - Browser: Microsoft Edge v 97.0.1072.55
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Reference: starred/radzen-blazor#294
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