setVisibleLayers isn't working as expected

Question

Hopefully this is a simple resolution - but I can't see what I'm doing wrong in attempting to set the visible layers of a Dynamic Map Service Layer. DynamicMap :: setVisibleLayers says that an array of [-1] will over-ride the layerInfos object and display no visible layers. But I'm finding that this is not the case:

Why is the layer still displaying when I've specified no visible layers? Similarly, whether I specify 0, 1 or 2 (the available layers in this sample service) the map draws the same. I've tried putting the setVisibleLayers line in various places, including after the layer has loaded as in this example. What am I doing wrong here? Thanks, Steve

PaulBushore · Accepted Answer

Hello,

From what I can see, the mapservice you are using there isn't actually a dynamic map service even though you are adding it as one.  The URL: http://server.arcgisonline.com/ArcGIS/rest/services/Specialty/Soil_Survey_Map/MapServer shows under the "Single Fused Map Cache" header that it is true, indicating that the map is cached, which I believe means that you cannot adjust the visibility of the layers.

I added my own dynamic map to the code you provided and it removed the map layers as well.

I would check that the map you are trying to add is really dynamic and not a fused cache.

Hope this helps!