Data Validation support is a key feature requirement for using Office Apps for OLTP systems.
The main idea is to fill the gap between VSTO features and Office Apps. This will help in easy portability of VSTO based apps to Office apps.16 votes
Thank you for the feedback! This is in our backlog and we plan to implement the API in the near future.
As always, when the design draft is ready, we’ll present design for review under the open-spec branches of this repository: https://github.com/officedev/office-js-docs.
Office Extensibility Team
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