Add an individual layer from ArcGISDynamicMapServiceLayer to the map

Question

I have a ArcGISDynamicMapServiceLayer containing many layers. I'd need to add only individual layers to the map, like layers 2,5 and 10.

The following code would add all the layers to the map:

url = "http://...MapServer";
mapServiceLayer = new ArcGISDynamicMapServiceLayer(url, {
     className: layer,
     opacity: opacity
});
map.addLayer(mapServiceLayer);

How can I add only i.e. layer 5 to the map? (.../MapServer/5)

There is a similar question here but answers seem not to be helpful for the front end solution.

Answer 1

See this sample:

http://developers.arcgis.com/javascript/sandbox/sandbox.html?sample=map_explicitlayerlist

To set which layers are visible before the layer loads that it uses ImageParameters:

//Use the ImageParameters to set the visibleLayerIds layers in the map service during ArcGISDynamicMapServiceLayer construction.
      var imageParameters = new ImageParameters();
      imageParameters.layerIds = [1,2];
      imageParameters.layerOption = ImageParameters.LAYER_OPTION_SHOW;
      //can also be: LAYER_OPTION_EXCLUDE, LAYER_OPTION_HIDE, LAYER_OPTION_INCLUDE

      layer = new ArcGISDynamicMapServiceLayer("http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Specialty/ESRI_StatesCitiesRivers_USA/MapServer",
        {"imageParameters": imageParameters});
      map.addLayer(layer);

Once the layer is added to the map you can use setVisibleLayers() and pass in an array of layer indexes (i.e. [5]) to turn layers off/on.

Answer 2

This should accomplish what what you want to do.

Layer = new esri.layers.FeatureLayer("yoururl/MapServer/5",);

map.addLayer(Layer);