LayerSwipe::Invalid layer type?

RochelleWolfe

Hello I am adding a LayerSwipe to my website, and get this error: LayerSwipe::Invalid layer type

The layers displayed in the map currently are featureLayers.

Here's the bit of code that I think it ties to

      var layerIds = currentMap.layerIds;

      console.log(layerIds);                                  // displays ["layer0", "layer1"]

      var layer = layerIds[1];

      console.log(layer);                                     // displays layer1

      var swipeWidget = new LayerSwipe ({

            type: "vertical",

            map: currentMap,

            layers: [layer]

      }, "swipeWidgetId");

      swipeWidget.startup();

When ran I get this error: LayerSwipe::Invalid layer type

Any advice for solving this will be greatly appreciated, as I feel I am so close to bringing this functionality to my website. Thanks very much!

Noah Sager

I think the issue is related to the fact that the LayerSwipe dijit expects a specific layer type, of which FeatureLayer is not a valid option.

Looking at the sample:

ArcGIS API for JavaScript Sandbox 

If you inspect the "swipeLayer" object at line 53 (for example adding a console state below)

console.log ("swipeLayer: ", swipeLayer)

You see it references a MapServer, which makes sense when we look at the layer property of the LayerSwipe dijit:

LayerSwipe | API Reference | ArcGIS API for JavaScript 3.29 

Which expects an array of Layer:

Layer | API Reference | ArcGIS API for JavaScript 3.29 

Which expects a URL to the ArcGIS Server REST resource that represents a map service

Layer | API Reference | ArcGIS API for JavaScript 3.29