provide an event to let Outlook Add-in respond to a change in the message being written (for example message body, To, Cc and Bcc lists)
As referred to the post:
https://social.msdn.microsoft.com/Forums/office/en-US/720a1bd6-abb9-4f75-863f-1fc33256a629/is-there-an-event-for-when-recipients-change-in-outlook-2013?forum=appsforoffice
there is no event JavaScript API an add-in for Outlook could use to react to a change in email message being written (compose mode).
For example if the user adds further To, Cc or Bcc Addresses, it would be advantageous if the add-in could react to it and display relevant data.

Thanks for your feedback, Requirement set 1.7 now supports the following events
1. RecurrenceChanged
2. RecipientsChanged
3. AppointmentTimeChanged
Documentation can be viewed here: https://docs.microsoft.com/en-us/javascript/api/office/office.eventtype?view=office-js
5 comments
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mmm commented
As far as I see the latest online office-js version 16.0.11329.10000 still contains only 2 addHandlerAsync events: ItemChanged, OfficeThemeChanged.
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vcq commented
addHandlerAsync is a great first step, but could you please provide support for the events listed above:
Subject
Location
ReceivedTime -
LK commented
Is there an update here? Would like to see the parity with OL's destkop version PropertyChange event: PropertyChange (To)
PropertyChange (CC)
PropertyChange (BCC)
PropertyChange (ReceivedTime)
PropertyChange (Subject)
And other props!Thank you.
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Rick Goud commented
Is there an update on this issue? Would be great if there is no manual trigger needed to activate an add-in in compose mode just like in read mode. Why is the priority low given te relatively high number of votes? Is there an overview what then has higher priority?
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Razvan.Bugheanu commented
Hi there,
I subscribe to this idea also. It would be really helpful.