Cannot find nested sublayers in a MapImageLayer

ae — Sun, 26 Jan 2020 20:44:19 GMT

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[1]

then that sublayer does not have any nested sublayers, even though it should:

let nestedSublayer = sublayer.sublayers.items[0]

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).

Re: Cannot find nested sublayers in a MapImageLayer

Noah-Sager — Mon, 27 Jan 2020 22:24:21 GMT

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:

https://codepen.io/noash/pen/WNbWdyO

Using this MapServer (with a couple levels of nested sublayers):

Military (MapServer)

Hope this helps.

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Cannot find nested sublayers in a MapImageLayer

Re: Cannot find nested sublayers in a MapImageLayer