Get Layer by name

Question

If I have been passed an esri.Map in a JavaScript function, how can I use the map object to get at a specific layer by name? The Map in question contains a map service, and the map service contains a number of sublayers (one of which I need). In my case, I want to get the MinScale and MaxScale for layer "0" (named "KMPosts" of this map service: River/GDT_SDE (MapServer)

Is it possible to do that without making a round-trip to the server?

RobertScheitlin__GISP · Accepted Answer

River Taig, Sure just use the map.getLayer("your dynamic layers ID"). If you do not know the layers exact id or the id was not specified when the layer was added so it got an map generated id then you can use the map.layerIds array and loop though those till you find your layerId. The you would get the layerInfos array and loop thought that to get the sublayer names and minScale and maxScale. Here is a sample to show this in action: Create Map with Custom ArcGISDynamicMapServiceLayer Layer Definitions