ArcGIS API for JavaScript (legacy) ^3.46

require([
  "esri/layers/KMLLayer", ... 
], function(KMLLayer, ... ) {
  var kmlUrl = 'http://www.ci.redding.ca.us/KML/SacRiverTrail.kml';
  kml = new KMLLayer(kmlUrl);
  ...
});

• Setting the layer ID in the layer constructor.

  require([
    "esri/layers/ArcGISDynamicMapServiceLayer", ... 
  ], function(ArcGISDynamicMapServiceLayer, ... ) {
    var population = new ArcGISDynamicMapServiceLayer("http://myserver/arcgis/rest/population/MapServer/Layers", {id:"population"});
    ...
  });
  

• Setting the layer ID after a layer is initialized.

  population.id = "population";
  

• Retrieving the layer ID.

  function getMapLayers() {
    for (var j=0, jl=map.layerIds.length; j<jl; j++) {
      var currentLayer = map.getLayer(map.layerIds[j]);
      alert("id: " + currentLayer.id);
    }
  }
  

require([
  "esri/layers/KMLLayer", "dojo/_base/array", ... 
], function(KMLLayer, array, ... ) {
  var kmlLayer = new KMLLayer( ... );
  var featureInfos = kmlLayer.folders[0].featureInfos;
  array.forEach(featureInfos,function(info){
    var feature = kmlLayer.getFeature(info);
    //do something with the feature here...
  });
  ...
});

require([
  "esri/layers/KMLLayer", "dojo/_base/array", ... 
], function(KMLLayer, array, ... ) {
  var kmlLayer = new KMLLayer( ... );
  var layers = kmlLayer.getLayers();
  array.forEach(layers, function(layer){
    if (layer.declaredClass === "esri.layers.FeatureLayer") {
    }
    else if (layer.declaredClass === "esri.layers.MapImageLayer") {
    }
  });
  ...
});

require([
  "esri/layers/KMLLayer", "dojo/_base/array", ... 
], function(KMLLayer, array, ... ) {
  var kmlLayer = new KMLLayer( ... );
  var folders = kmlLayer.folders;
  array.forEach(folders,function(folder){
    kmlLayer.setFolderVisibility(folder,true);
  });
  ...
});

layer.setOpacity(0.5);