how to identify a dynamiclayer added on the fly

[DuarteCarreira]

Wondering if anyone knows how to identify a dynamiclayer as in a joindatasource layer?

The REST API has a DynamicLayers text box in the identify request where I can successfully get results from a layer that does not exist on the mapservice. You can see it here:

Identify (Census)

I just can't find a way to do this in Javascript. Do I really need to build the request manually? It seems weird... dynamiclayers exist since 10.1, I suppose there is a way in the JS API?

Thanks.

[DuarteCarreira · Accepted solution]

Well this turned out to be very easy... but has some loopholes...

So, if you have already added your dynamiclayer to your map, this will be defined:

dynamicMapServiceLayer.dynamicLayerInfos

For the identify task to target your dynamiclayer, you have to put the above into the IdentifyParams:

identifyParams.dynamicLayerInfos = dynamicMapServiceLayer.dynamicLayerInfos;

The caveat: you cannot put anything in identifyParams.layerIds.

My understanding (for now) is that layerIds are for the original mapservice layers. If you need to identify  dynamiclayers you added on the fly *and* layers that were already in the mapservice, you should create 2 separate identifyTask.

So I hope this helps someone else... sorry I don't have a complete sample... theoretically a sample can be made using a dynamicMapService from esri that supports dynamic symbology.