ArcGIS API for JavaScript ^3.26

var layer = new CSVLayer("https://earthquake.usgs.gov/earthquakes/feed/v1.0/summary/2.5_week.csv", {
  fields: [{name: "mag", type: "Number"}]
});

var wildfireResponsePointsFeatureLayer = new FeatureLayer(url, featureLayerOptions);
map.addLayer(wildfireResponsePointsFeatureLayer);

wildfireResponsePointsFeatureLayer.on("load", function featureLayerLoaded(event){
  console.log("advancedQueryCapabilities"),   wildfireResponsePointsFeatureLayer.advancedQueryCapabilities);
  /* Object {supportsStatistics: true, supportsOrderBy: true, supportsDistinct: true} */
});

var isVisible = layer.defaultVisibility;

• 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);
    }
  }
  

labelingInfo: [{
  "labelExpression": "", //deprecated, labelExpressionInfo property should be used in its place
  "labelExpressionInfo": {
   {"value": "City Of {CITY_NAME} has population {POPULATION}"}
  },
  "useCodedValues":  //parameters used when attribute field has domain values,
  "labelPlacement": "above-right",
  "symbol": {...}, //TextSymbol used for labeling
  "minScale": 0, //specified scale range where labels are visible
  "maxScale": 5000,
  //fieldInfos structure describes attribute field formatting
  "fieldInfos": [
    { fieldName: "created_date", format: { dateFormat: "shortDate"} }, //date/time formatting 
    { fieldName: "last_edited_date", format: { dateFormat: "longDate"} },  //date/time formatting
    { fieldName: "eventtype", format: { places: 6, digitSeparator: true } } //numeric formatting
  ],
  "where": "POP_RANK > 2 AND POP_RANK < 4" //where clause applied on labels
}]

var infoTemplate = new InfoTemplate("Attributes", "${*}");

var url = "http://servername.fqdn.suffix/arcgis/rest/services/Hosted/pasadena/FeatureServer/0";
var featureLayerOptions = {
  id: "cities",
  mode: FeatureLayer.MODE_AUTO,
  outFields: ["*"],
  infoTemplate: infoTemplate
};
var citiesFeatureLayer = new FeatureLayer(url, featureLayerOptions);

map.addLayer(citiesFeatureLayer);

require([
  "esri/layers/FeatureLayer", "dojo/_base/array", ... 
], function(FeatureLayer, array, ... ) {
  var layer = new FeatureLayer( ... );
  var templates = layer.templates;
  array.forEach(templates,function(template){
    console.log(template.description);
    console.log(template.name);
  });
  ...
});

require([
  "esri/symbols/SimpleFillSymbol", "esri/graphic", ... 
], function(SimpleFillSymbol, Graphic, ... ) {
  function addGraphic(geometry) {
    var symbol = new SimpleFillSymbol();
    graphicsLayer.add(new Graphic(geometry, symbol));
  }
  ...
});

graphicsLayer.clear();

featureLayer.disableFeatureReduction();

  featureLayer.enableFeatureReduction();

var aggregateGraphics = featureLayer.getAggregateGraphics();

var capabilities = featureLayer.getEditCapabilities();

if(capabilities.canUpdate){

  console.log("This layer can be updated");

}

featureLayer.getFeatureReduction();

 var currentOffset = featureLayer.getMaxAllowableOffset();

var singleGraphics = featureLayer.getSingleGraphics();

require([
  "esri/map", "esri/layers/FeatureLayer", "esri/layers/TimeInfo", ... 
], function(Map, FeatureLayer, TimeInfo, ... ) {
  var timeSlider = new TimeSlider( ... );
  var featureLayer = new FeatureLayer();
  timeSlider.createTimeStopsByTimeInterval(featureLayer.getTimeDefinition(), 
    1, TimeInfo.UNIT_HOURS);
  ...
});

citiesFeatureLayer.on("load", function featureLayerLoaded(event){
  var hasXYFootprint = citiesFeatureLayer.hasXYFootprint();
  console.log("Contains xyfootprints:", hasXYFootprint);
});

featureLayer.isFeatureReductionActive();

featureLayer.isFeatureReductionEnabled();

require([
  "esri/tasks/query", "FeatureLayer", ... 
], function(Query, FeatureLayer, ... ) {
  var query = new Query();
  var featureLayer = new FeatureLayer( ... );
  query.where = "POP90_SQMI < 100";
  featureLayer.queryCount(query, function(count) {
    console.log(count + " features satisfied the input query");
  }, function(error) {
    console.log(error);
  });      
  ...
});

require([
  "esri/layers/FeatureLayer", "esri/tasks/query", ... 
], function(FeatureLayer, Query, ... ) {
  featureLayer = new FeatureLayer( ... );
  var query = new Query();
  query.objectIds = [features[0].attributes.OBJECTID];
  query.outFields = [ "*" ];
  // Query for the features with the given object ID
  featureLayer.queryFeatures(query, function(featureSet) {
  });
  ...
});

require([
  "esri/layers/FeatureLayer", "esri/tasks/query", ... 
], function(FeatureLayer, Query, ... ) {
  var featureLayer = new FeatureLayer( ... );
  // create a query to fetch object IDs for all records
  var query = new Query();
  query.where = "1=1";
  
  featureLayer.queryIds(query, function(objectIds) {
    //do something with the objectIds here
  });
  ...
});

require([
  "esri/layers/FeatureLayer", "esri/tasks/RelationshipQuery", "dojo/_base/connect", ... 
], function(FeatureLayer, RelationshipQuery, connect, ... ) {
  var featureLayer = new FeatureLayer( ... );
  var relatedQuery = new RelationshipQuery();
  relatedQuery.outFields = ["AGREE_WITH_INCIDENT"];
  relatedQuery.relationshipId = 1;
  
  //query for the features related to the "clicked" feature
  connect.connect(featureLayer, "onClick", function(evt) {
    graphicAttributes = evt.graphic.attributes;
    relatedQuery.objectIds = [graphicAttributes.OBJECTID];
    featureLayer.queryRelatedFeatures(relatedQuery,relatedRecords);
  }
  ...
});

require([
  "esri/tasks/query", "esri/layers/FeatureLayer", ... 
], function(Query, FeatureLayer, ... ) {
  var query = new Query();
  var featureLayer = new FeatureLayer( ... );
  query.geometry = feature.geometry;
  featureLayer.selectFeatures(query,FeatureLayer.SELECTION_NEW);
  ...
});

featureLayer.setAutoGeneralize(false);

featureLayer.setDefinitionExpression("STATE_NAME = 'South Carolina'");

featureLayer.setEditable(true);

  featureLayer.setFeatureReduction({
    type: "cluster",
    clusterRadius: 60
  });

require([
  "esri/InfoTemplate", ... 
], function(InfoTemplate, ... ) {
    var template = new InfoTemplate();

    template.setTitle("${qAddress}");

    template.setContent(getTextContent);

    featureLayer.setInfoTemplate(template);
  ...
});

//make sure the Map's showLabels option is set to true
  var map = new Map("map", {
    basemap: "streets",
    center:[-80, 30],
    zoom: 5,
    showLabels : true
  });
 
//create featurelayer
  var flayer = new FeatureLayer(url, {
    outFields: ["*"] //make sure field to label is specified here in outFields
  });


//create a text symbol and renderer to define the style of labels
   var labelSymbol = new TextSymbol(); 
   var labelRenderer = new SimpleRenderer(labelSymbol);


var json = {
  "labelExpressionInfo": {"value": "{LocalTime}"},
  "useCodedValues": false,
  "labelPlacement":"above-right",
  "fieldInfos": [{fieldName: "LocalTime",format: { "dateFormat": "shortDate"}}]
  };

//create instance of LabelClass
  var lc = new LabelClass(json);
  lc.symbol = labelSymbol; // symbol also can be set in LabelClass' json
  flayer.setLabelingInfo([ lc ]);

require([
  "esri/layers/FeatureLayer", ... 
], function(FeatureLayer, ... ) {
  featureLayer = new FeatureLayer(featureLayerUrl, {
    maxAllowableOffset: 1000
  });
  ...
});

featureLayer.setOpacity(.50);

require([
  "esri/symbols/SimpleFillSymbol", "esri/Color", "esri/renderers/SimpleRenderer", ... 
], function(SimpleFillSymbol, Color, SimpleRenderer, ... ) {
  var symbol = new SimpleFillSymbol().setColor(new Color([255,0,0,0.5]));

  var renderer = new SimpleRenderer(symbol);

  featureLayer.setRenderer(renderer);
  ...
});

featureLayer.setScaleRange(591657528,147914381);

require([
  "esri/layers/FeatureLayer", "esri/symbols/SimpleFillSymbol", "esri/Color", ... 
], function(FeatureLayer, SimpleFillSymbol, Color, ... ) {
  var featureLayer = new FeatureLayer( ... );
  var selectionSymbol = new SimpleFillSymbol().setColor(new Color([255,255,0,0.5]));
  featureLayer.setSelectionSymbol(selectionSymbol);
  ...
});

require([
  "esri/TimeExtent", "esri/layers/FeatureLayer", ... 
], function(TimeExtent, FeatureLayer, ... ) {
  var defn = new TimeExtent();
  var featureLayer( ... );
  defn.startTime = new Date("November 30,2009 6:00:00")
  defn.endTime = new Date("November 30, 2009 8:00:00");
  featureLayer.setTimeDefinition(defn);
  ...
});

layer.setWebGLEnabled(true);