Currently, there’s no direct notifier for “signer session expired” event. From my test, I noticed there will be a “feedback container is no longer supported” warning but I won’t consider it as a trigger.
So for temporary, you can build this capability at your own side. After you receive the last notifier from iFrame, the signer session will be expired after a fixed timeout (by default it’s a 30 mins and you can set this timeout by contacting our support). So you can use a count down clock in your front end listening to this event.
At the same time, you can fill in an ER form by contacting email@example.com for enhancement of this feature.
Alternatively, there’s a workaround for you:
#1, modify your “signer redirect url” attribute, link it to a source within your domain (in the example, i used child.html). To change your redirect url, you’d contact our support team.
#2, in this internal source, you directly call an IIFE JS function, to post message to your parent window by