Can we set a calculated field to only calculate when offline map is syncronised?

[LindsayRaabe_FPCWA]

I've just started using Calculated Expressions in fields in feature services used in offline maps in Field Maps. So far, it's been great, but I do have a question. 

Is it possible to set a field to trigger the calculation when the data is syncronised to prevent duplicate values being calculated?

In my particular instance, I'm calculating an incrementing ID that reads the existing features, finds the max value and adds 1 to create a new value. This works fine when in online mode, but when offline, it only reads the features that are also offline, and thus only increments upwards from there, resulting in duplicate values. If the calculation could be fired on sync, then it would (hopefully) read all values in the feature service first and calculate a new unique value. 

[Anonymous User · Accepted solution]

This is not supported with Form Calculations. You need server-side logic to mange a consistent sequence. Form calculations are only evaluated on the client apps.

Attribute rules is a better option for this, though it's not supported in ArcGIS Online yet. Here's a video showing how this could work in Pro and eventually in other products.

[LindsayRaabe_FPCWA]

Hi Aaron. I suspected that the answer might be around Attribute Rules, but also couldn't find anything about them working in ArcOnline yet, so thanks for clarifying that. 

[GuyWeerasingheAFF]

I think this has been addressed now

Works with offline maps, but not when you have the device in offline/airplane mode and using the AGOL webmap

Solved: Field Maps, Offline Map, Arcade Calculation Expres... - Esri Community