Old web app using Javascript API 3.8 - compatible with ArcServer 10.9.1 services published through Pro?

[AllenScully2]

Hi - 

We have an old web app that uses Javascript API 3.8.

It has been showing a few bug like behaviors since the ArcServer version for the services it uses moved from 10.7.1 to 10.9.1, and they were re-created and published from ArcPro 3.1.

     - Specifically, selection behavior on the map - one feature can be selected but not multiple features.  

Seems like there may be a compatibility issue - but I am not a developer and haven't found documentation specifically addressing this - 

Thanks 

[Scott_Tansley]

Hi, this probably isn't strictly the answer to your question, but I'd recommend you looking at:

https://support.esri.com/en-us/products/arcgis-api-for-javascript/life-cycle

The version you're using hasn't been supported since Aug 1, 2022.  It was probably released somewhere around 2013-2015 as a guess.  The whole 3.x set of libraries is due for deprecation on 30/06/2024 and so it would probably make sense to start looking at using another approach to this application as a matter of urgency. 

There is a good degree of forward/backwards compatibility with the JavaScript/Rest APIs, but this is pushing the boundaries a bit.