I'm trying to create my own custom layer-list component with an integrated legend (I'm not using the APIs LayerList widget as I need more functionality). When trying to integrate MapImageLayers into my component, I also need to accommodate nested sublayers (sublayers within a sublayer).
However, if I create a MapImageLayer using a service that has nested sublayers, i.e.:
let layer = new MapImageLayer(...)
and then retrieve the sublayer that I know has nested sublayers:
let sublayer = layer.sublayers.items
then that sublayer does not have any nested sublayers, even though it should:
let nestedSublayer = sublayer.sublayers.items
instead, sublayer.sublayers is null.
Does anyone know how/where I can find the hierarchy of the MapService when loaded into a MapImageLayer?
edit: Seemingly the sublayers property contain a flat collection of all sublayers in the layer (i.e. they are on the same level regardless of whether they are nested within other sublayers or not).
This should work. I would make sure that you have the correct order when searching for nested sublayers, as this has thrown me for a loop in the past. Here is a working sample that prints out nested sublayer info in the console:
Using this MapServer (with a couple levels of nested sublayers):
Hope this helps.