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For details, see New name for apps for Office and Share Point.Your custom code can handle three categories of events in provider-hosted add-ins: Share Point-hosted Share Point Add-ins do not support event handling, but you can turn a workflow into a kind of list or list item event handler by setting an event to trigger the workflow. Workflows cannot be triggered by add-in events, so add-in events cannot be handled with a Share Point-hosted add-in.
They need the validation should be varied based on user's sharepoint groups How we handle the validation?There are certain scenarios that we will be writing Item Updated Event. But there could be a situation like, on the Item Updated itself, we will be updating the same list item.In detail, I have a list which has an Item Updated Event Receiver (Custom one, which developed by the developer).There appear to be four (4) Taxonomy Event Receivers: The problematic library at the customer was lacking the first set of Event Receivers, which are responsible for syncing the hidden field. I can’t really explain why only some Content Types were affected.I’ve written a one-off script (Console App) that loops all lists with a Managed Metadata field on all sites in the site collection and ensures the Taxonomy event receivers. I’m guessing the Optional/Required setting of the Managed Metadata field is involved somehow, but I didn’t really confirm that through testing.I tried reproducing that configuration in a new document library but there everything kept working, so the issue had to be with the existing library.
Further analysis, comparison and reflection showed that the problematic library was missing some Taxonomy-related Event Receivers.So you have to think alternatives before start validation coding in event handlers.Event handlers allows you to access all the items in sharepoint object model but not in a straight forward way.Note Website events and site collection events are not supported in Share Point Add-ins.There are two kinds of events: To handle list and list item events, you create remote event receivers (RERs), which are web services that run externally to the Share Point farm or Share Point Online.Also not sure why the Event Receivers were missing in the first place.