# UI Extensions

**URL:** https://community.hubspot.com/c/develop-build-integrate/ui-extensions/219.md

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## [Types in Input change handlers ignore empty values](https://community.hubspot.com/t/types-in-input-change-handlers-ignore-empty-values/161930)

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**Author:** [@inventable-rears8](https://community.hubspot.com/u/inventable-rears8)\
**Replies:** 2\
**Last updated:** [October 15, 2026, 7:21pm UTC](https://community.hubspot.com/t/types-in-input-change-handlers-ignore-empty-values/161930 "2026-10-15T19:21:25Z")

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The typescript types for the onChange handlers of the TimeInput and DateInput components are incomplete, they don’t cover the…

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## [Bug in the ProgressBar component](https://community.hubspot.com/t/bug-in-the-progressbar-component/161891)

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**Author:** [@inventable-rears8](https://community.hubspot.com/u/inventable-rears8)\
**Replies:** 1\
**Last updated:** [October 14, 2026, 11:14am UTC](https://community.hubspot.com/t/bug-in-the-progressbar-component/161891 "2026-10-14T11:14:46Z")

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Error description The progress bar component provides faulty visualizations of progress. The warning variant of a progress b…

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## [Requirements for UI Extensions / custom App Cards (for Hubspot Pro)](https://community.hubspot.com/t/requirements-for-ui-extensions-custom-app-cards-for-hubspot-pro/156859)

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**Author:** [@TSamuelson](https://community.hubspot.com/u/TSamuelson)\
**Replies:** 4\
**Last updated:** [August 29, 2026, 1:48pm UTC](https://community.hubspot.com/t/requirements-for-ui-extensions-custom-app-cards-for-hubspot-pro/156859 "2026-08-29T13:48:56Z")

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Hi HubSpot Support, We’re evaluating whether we can build a custom App Card (UI Extension) using the React-based Developer P…