FeatureLayer

// set the api key to access a protected service
const layer = new FeatureLayer({
  url: serviceUrl,
  apiKey: "YOUR_API_KEY"
});

// Once the layer loads, check if the
// supportsAdd operations is enabled on the layer
await featureLayer.load();
if (featureLayer.capabilities.operations.supportsAdd) {
  // if new features can be created in the layer
  // set up the UI for editing
  setupEditing();
}

// send a custom parameter to your special service
let layer = new MapImageLayer({
  url: serviceUrl,
  customParameters: {
    "key": "my-special-key"
  }
});

const layer = new FeatureLayer({
 // layer's fields definition
 fields: [
 {
   name: "ObjectID",
   alias: "ObjectID",
   type: "oid"
 }, {
   name: "type",
   alias: "Type",
   type: "string"
 }, {
   name: "recordedDate",
   alias: "recordedDate",
   type: "date"
 }],
 dateFieldsTimeZone: "America/New_York", // date field values in are eastern time zone
 objectIdField: "ObjectID", // inferred from fields array if not specified
 geometryType: "point", // geometryType and spatialReference are inferred from the first feature
                        // in the source array if they are not specified.
 spatialReference: { wkid: 4326 },
 source: graphics  //  an array of graphics with geometry and attributes
});
map.add(layer);

// Only download data for the year 2020.
// if the layer supports unknown time zone then create
// the dates in UTC
if (layer.datesInUnknownTimezone) {
  layer.timeExtent = new TimeExtent({
    start: new Date(Date.UTC(2020, 0, 1)),
    end: new Date(Date.UTC(2021, 0, 1))
  });
}
else {
  layer.timeExtent = new TimeExtent({
    start: new Date(2020, 0, 1),
    end: new Date(2021, 0, 1)
  });
}

// set up the timeslider for a service with an unknown timezone
if (layer.datesInUnknownTimezone) {
  const timeSlider = new TimeSlider({
    view: view,
    container: "timeSliderDiv",
    timeVisible: true,
  });
  view.ui.add(timeSlider, "bottom-left");

  view.whenLayerView(layer).then((layerView) => {
   // get the layer's fullTimeExtent and remove the local
   // time zone offset
    const timExtent = new TimeExtent({
      start: removeLocalOffset(layer.timeInfo.fullTimeExtent.start),
      end: removeLocalOffset(layer.timeInfo.fullTimeExtent.end)
    });

    timeSlider.fullTimeExtent = timExtent;
    timeSlider.stops = {
      interval: layer.timeInfo.interval;
    };
  });
}

// Remove the local time zone offset from dates
function removeLocalOffset(localTime) {
  return new Date(
    localTime.getUTCFullYear(),
    localTime.getUTCMonth(),
    localTime.getUTCDate(),
    localTime.getUTCHours(),
    localTime.getUTCMinutes(),
    localTime.getUTCSeconds(),
    localTime.getUTCMilliseconds()
  );
}

// Set definition expression in constructor to only display trees with scientific name Ulmus pumila
const layer = new FeatureLayer({
  url: "https://services.arcgis.com/V6ZHFr6zdgNZuVG0/arcgis/rest/services/Landscape_Trees/FeatureServer/0",
  definitionExpression: "Sci_Name = 'Ulmus pumila'"
});

// Set the definition expression directly on layer instance to only display trees taller than 50ft
layer.definitionExpression = "HEIGHT > 50";

// set a scale-dependent display filter on a layer
const layer = new FeatureLayer({
  portalItem: {
    id: "28dbd58ad90e4a47ab0e0334d2b69427"
  },
  minScale: 0,
  maxScale: 0,
  outFields: ["*"],
  // set scale-dependent display filters to declutter the display at different scales.
  // Show more streams as user zooms in and less as user zooms out.
  displayFilterInfo: new DisplayFilterInfo({
    mode: "scale",
    filters: [
      {
        title: "streamOrder >= 8",
        minScale: 0,
        maxScale: 18_489_297.737236,
        where: "streamOrder >= 8"
      },
      {
        title: "streamOrder >= 6",
        minScale: 18_489_297.737236
        maxScale: 9_244_648.868618,
        where: "streamOrder >= 6"
      },
      {
        title: "streamOrder >= 4",
        minScale: 9_244_648.868618,
        maxScale: 577790.5542885
        where: "streamOrder >= 4"
      },
      {
        title: "all",
        minScale: 577790.5542885,
        maxScale: 0
      }
    ]
  })
});

const layer = new FeatureLayer({
  url: "https://sampleserver6.arcgisonline.com/arcgis/rest/services/AGP/Census/MapServer",
  title: "United States Population",
  popupTemplate: {
    title: "{states.STATE_NAME}",
    content: "{expression/per_ancestry}% of the {states.POP2007} people in {states.STATE_NAME} have "
      + "Norwegian ancestry.",
    expressionInfos: [{
      name: "per_ancestry",
      expression: "Round( ( $feature['ancestry.norwegian'] / $feature['states.POP2007'] ) * 100, 1)"
    }],
    fieldInfos: [{
      fieldName: "states.POP2007",
      fieldFormat: {
        type: "number",
        useGrouping: "always",
        maximumFractionDigits: 0
      }
    }]
  },
  dynamicDataSource: {
    type: "data-layer",
    dataSource: {
      type: "join-table",
      leftTableSource: {
        type: "map-layer",
        mapLayerId: 3
      },
      rightTableSource: {
        type: "data-layer",
        dataSource: {
          type: "table",
          workspaceId: "CensusFileGDBWorkspaceID",
          dataSourceName: "ancestry"
        }
      },
      leftTableKey: "STATE_NAME",
      rightTableKey: "State",
      joinType: "left-outer-join"
    }
  }
});

// the following effect will be applied to the layer at all scales
// brightness will be applied first, then hue-rotate followed by contrast
// changing order of the effects will change the final result
layer.effect = "brightness(5) hue-rotate(270deg) contrast(200%)";

// set a scale dependent bloom effect on the layer
layer.effect = [
  {
    scale: 36978595,
    value: "drop-shadow(3px, 3px, 4px)"
  },
  {
    scale: 18489297,
    value: "drop-shadow(2px, 2px, 3px)"
  },
  {
    scale: 4622324,
    value: "drop-shadow(1px, 1px, 2px)"
  }
];

// gray out features that fall outside of the 3 mile buffer of the mouse's location
// by setting feature effect on excluded features
layer.featureEffect = new FeatureEffect({
  filter: new FeatureFilter({
    geometry: filterGeometry,
    spatialRelationship: "intersects",
    distance: 3,
    units: "miles"
  }),
  excludedEffect: "grayscale(100%) opacity(30%)"
});

// Apply a drop-shadow feature effect to the features that intersect the borough boundaries,
// while applying blur and brightness effects to the features that are excluded from filter criteria.
// The resulting map will make it easier to spot if the residents are more likely to experience deprivation
// if they live on a borough boundary.
const featureFilter = new FeatureFilter({
  where: "BoroughEdge='true'"
});
layer.featureEffect = new FeatureEffect({
  filter: featureFilter,
  includedEffect: "drop-shadow(3px, 3px, 3px, black)",
  excludedEffect: "blur(1px) brightness(65%)"
});

// clusters features based on their spatial proximity to other features
layer.featureReduction = {
  type: "cluster",
  clusterRadius: 100
};

// thins features in the view
layer.featureReduction = {
  type: "selection"
};

// Aggregates features to bins
layer.featureReduction = {
  type: "binning",
  renderer: {
    type: "simple",  // autocasts as new SimpleRenderer()
    symbol: {
      type: "simple-fill",  // autocasts as new SimpleFillSymbol()
      outline: {  // autocasts as new SimpleLineSymbol()
        width: 0.5,
        color: "white"
      }
    },
    visualVariables: [{
      type: "color",
      field: "aggregateCount",
      stops: [
        { value: 1, color: "white" },
        { value: 1000, color: "blue" }
      ]
    }]
  },
  popupTemplate: {
    content: "This bin contains <b>{aggregateCount}</b> features.",
    fieldInfos: [{
      fieldName: "aggregateCount",
      format: {
        digitSeparator: true,
        places: 0
      }
    }]
  }
};

// Adding a new field configuration
const addNewConfig = (layer, fieldName, alias,
fieldFormat) => {
  // Check if there is already an existing configuration for fieldName
  const existingConfig = layer.getFieldConfiguration(fieldName);
  if (!existingConfig) {
    const newConfig = new FieldConfiguration({ name: fieldName, alias, fieldFormat });
    const newConfigs = clone(layer.fieldConfigurations);
    newConfigs.push(newConfig);
    layer.fieldConfigurations = newConfigs;
  }
};

// Updating an existing field configuration
const updateConfig = (layer, fieldName, alias,
fieldFormat) => {
  const existingConfig = layer.getFieldConfiguration(fieldName);
  if (existingConfig) {
    const newConfig = existingConfig.clone();
    newConfig.alias = alias;
    newConfig.fieldFormat = fieldFormat;

    const index = layer.fieldConfigurations.indexOf(existingConfig);
    const newConfigs = clone(layer.fieldConfigurations);
    newConfigs[index] = newConfig;
    layer.fieldConfigurations = newConfigs;
  }
};

// Deleting an existing field configuration
const deleteConfig = (layer, fieldName) => {
  const existingConfig = layer.getFieldConfiguration(fieldName);
  if (existingConfig) {
    const index = layer.fieldConfigurations.indexOf(existingConfig);
    var newConfigs = clone(layer.fieldConfigurations);
    newConfigs.splice(index, 1);
    layer.fieldConfigurations = newConfigs;
 }
};

// define each field's schema
const fields = [
 new Field({
   name: "ObjectID",
   alias: "ObjectID",
   type: "oid"
 }), new Field({
   name: "description",
   alias: "Description",
   type: "string"
 }), new Field ({
   name: "title",
   alias: "Title",
   type: "string"
 })
];

// See the sample snippet for the source and renderer properties
const layer = new FeatureLayer({
  // geometryType and spatialReference are inferred
  // from the input source features
  source: features,
  // Object ID field is inferred from the fields array
  fields: fields,
  renderer: renderer
});

// lookup a field by name. name is case-insensitive
const field = layer.fieldsIndex.get("SoMeFiEld");

if (field) {
  console.log(field.name); // SomeField
}

// Create the Field Elements to pass into the template
const fieldElement1 = new FieldElement({
  fieldName: "firstname",
  label: "First name",
  description: "First name of emergency contact"
});

const fieldElement2 = new FieldElement({
  fieldName: "lastname",
  label: "Last name",
  description: "Last name of emergency contact"
});

// Create the form's template
const formTemplate = new FormTemplate({
  title: "Emergency information",
  description: "In case of emergency, update any additional information needed",
  elements: [fieldElement1, fieldElement2] // pass in array of field elements from above
});

// Pass the template to the layer
featureLayer.formTemplate = formTemplate;

// Pass the layer to the FeatureForm
const form = new FeatureForm({
  container: "form", // html div referencing the form
  layer: featureLayer
});

const statesLabelClass = new LabelClass({
  labelExpressionInfo: { expression: "$feature.NAME" },
  symbol: {
    type: "text",  // autocasts as new TextSymbol()
    color: "black",
    haloSize: 1,
    haloColor: "white"
  }
});

featureLayer.labelingInfo = [ statesLabelClass ];

// loads the third layer in the given Portal Item
const layer = new FeatureLayer({
  portalItem: {
    id: "8d26f04f31f642b6828b7023b84c2188"
  },
  layerId: 2
});

// If not specified, the first layer (layerId: 0) will be returned
const layer = new FeatureLayer({
  portalItem: {
    id: "8d26f04f31f642b6828b7023b84c2188"
  }
});

// Can also be used if URL points to service and not layer
const layer = new FeatureLayer({
  // Notice that the url doesn't end with /2
  url: "http://services.arcgis.com/V6ZHFr6zdgNZuVG0/arcgis/rest/services/MonterreyBayCanyon_WFL/FeatureServer",
  layerId: 2
});

// This code returns the same layer as the previous snippet
const layer = new FeatureLayer({
  // The layer id is specified in the URL
  url: "http://services.arcgis.com/V6ZHFr6zdgNZuVG0/arcgis/rest/services/MonterreyBayCanyon_WFL/FeatureServer/2",
});

// The layer will not be visible when the view is zoomed in beyond a scale of 1:1,000
layer.maxScale = 1000;

// The layer's visibility is not restricted to a maximum scale.
layer.maxScale = 0;

// The layer will not be visible when the view is zoomed out beyond a scale of 1:3,000,000
layer.minScale = 3000000;

// The layer's visibility is not restricted to a minimum scale.
layer.minScale = 0;

// See the sample snippet for the source and fields properties
const layer = new FeatureLayer({
  source: features,
  fields: fields,
  objectIdField: "ObjectID",  // field name of the Object IDs
  geometryType: "point",
  renderer: <renderer>
});

// Features with smaller population values will
// be rendered on top of larger features.
layer.orderBy = [{
  field: "POPULATION"
}];

// Features with larger population values will
// be rendered on top of smaller features.
layer.orderBy = [{
  field: "POPULATION",
  order: "descending"
}];

// Orders features by date in descending order.
// The most recent features will be rendered
// on top of older features.
layer.orderBy = [{
  field: "Alarm_Date",
  order: "descending"
}];

// Orders features by storm warning duration in descending order.
// Warnings with longer durations
// be rendered on top of warnings with shorter durations.
layer.orderBy = [{
  valueExpression: "DateDiff($feature.Watch_End, $feature.Watch_Start, 'hours' )",
  order: "descending"
}];

// Orders features by data values used in a size visual variable
const sizeVariable = layer.renderer.visualVariables.find( vv => vv.type === "size");
const { field, valueExpression } = sizeVariable;
layer.orderBy = [{
  field,
  valueExpression,
  order: "ascending"
}];

// Includes all fields from the service in the layer
fl.outFields = ["*"];

// Get the specified fields from the service in the layer
// These fields will be added to FeatureLayerView.availableFields
// along with rendering and labeling fields. Use these fields
// for client-side filtering and querying.
fl.outFields = ["NAME", "POP_2010", "FIPS", "AREA"];

// set the outFields for the layer coming from webmap
webmap.when(function () {
  layer = webmap.layers.at(1);
  layer.outFields = ["*"];
});

// While this example uses FeatureLayer, this same pattern can be
// used for other layers that may be loaded from portalItem ids.
const layer = new FeatureLayer({
  portalItem: {  // autocasts as new PortalItem()
    id: "caa9bd9da1f4487cb4989824053bb847"
  }  // the first layer in the service is returned
});

// Set hostname when using an on-premise portal (default is ArcGIS Online)
// esriConfig.portalUrl = "http://myHostName.esri.com/arcgis";

// While this example uses FeatureLayer, this same pattern can be
// used for SceneLayers.
const layer = new FeatureLayer({
  portalItem: {  // autocasts as new PortalItem()
    id: "8d26f04f31f642b6828b7023b84c2188"
  },
  // loads the third item in the given feature service
  layerId: 2
});

// Initialize GeoJSONLayer by referencing a portalItem id pointing to geojson file.
const layer = new GeoJSONLayer({
  portalItem: new PortalItem({
    id: "81e769cd7031482797e1b0768f23c7e1",
    // optionally define the portal, of the item.
    // if not specified, the default portal defined is used.
    // see https://developers.arcgis.com/javascript/latest/api-reference/esri-config.html#portalUrl
    portal: new Portal({
      url: "https://jsapi.maps.arcgis.com/"
    })
  }
});

// This snippet loads a table hosted in ArcGIS Online.
const table = new FeatureLayer({
  portalItem: { // autocasts as esri/portal/PortalItem
    id: "123f4410054b43d7a0bacc1533ceb8dc"
  }
});

// Before adding the table to the map, it must first be loaded and confirm it is the right type.
table.load().then(() => {
  if (table.isTable) {
    map.tables.add(table);
  }
});

// While this example uses FeatureLayer, this same pattern can be
// used for other layers that may be loaded from portalItem ids.
const layer = new FeatureLayer({
  portalItem: { // autocasts as esri/portal/PortalItem
    id: "caa9bd9da1f4487cb4989824053bb847",
    // Set an API key to access a secure portal item configured with API key authentication.
    apiKey: "APIKEY"
  }
});

// Log the current publishing status after each checks.
when(
  () => !layer.publishingInfo.updating,
  (status) => {
    switch (layer.publishingInfo.status) {
      case "unknown":
        console.log("The layer's publishing status is unknown at this point");
        break;
      case "unavailable":
        console.log("The layer doesn't provide publishing information");
        break;
      case "publishing":
        console.log("Layer is publishing");
        break;
      case "published":
        console.log("Layer is published at", layer.url);
        break;
    }
  },
  { initial: true }
);

// the layer will be refreshed every 1 minute.
layer.refreshInterval = 1;

// print out layer's relationship length and each relationship info to console
layer.when(function () {
  console.log("layer relationships", layer.relationships.length);

  layer.relationships.forEach(function (relationship) {
    console.log("relationship id:", relationship.id)
    console.log("relationship cardinality:", relationship.cardinality)
    console.log("relationship key field:", relationship.keyField)
    console.log("relationship name:", relationship.name)
    console.log("relationship relatedTableId:", relationship.relatedTableId)
  });
});

// all features in the layer will be visualized with
// a 6pt black marker symbol and a thin, white outline
layer.renderer = {
  type: "simple",  // autocasts as new SimpleRenderer()
  symbol: {
    type: "simple-marker",  // autocasts as new SimpleMarkerSymbol()
    size: 6,
    color: "black",
    outline: {  // autocasts as new SimpleLineSymbol()
      width: 0.5,
      color: "white"
    }
  }
};

let features = [
 {
   geometry: {
     type: "point",
     x: -100,
     y: 38
   },
   attributes: {
     ObjectID: 1,
     DepArpt: "KATL",
     MsgTime: Date.now(),
     FltId: "UAL1"
   }
 },
 ...
];

// geometryType and spatialReference of the layer
// will be inferred from the first feature in the array
// if it has a geometry.
let layer = new FeatureLayer({
  source: features,  // autocast as a Collection of new Graphic()
  objectIdField: "ObjectID"
});

// Create an empty non-spatial feature layer
// Set geometryType property to null when creating non-spatial feature layer
const layer = new FeatureLayer({
  source: [],
  objectIdField: "OBJECTID",
  fields: [{
    name: "OBJECTID",
    type: "oid"
  }],
  geometryType: null
});
layer.load().then(() => console.log(layer.isTable))

if (!layer.useViewTime) {
  if (layer.timeExtent) {
    console.log("Current timeExtent:", layer.timeExtent.start, " - ", layer.timeExtent.end}
  } else {
    console.log("The layer will display data within the view's timeExtent.");
    console.log("Current view.timeExtent:", view.timeExtent.start, " - ", view.timeExtent.end}
  }
}

// set the timeExtent on the layer and useViewTime false
// In this case, the layer will honor its timeExtent and ignore
// the view's timeExtent
const layer = new ImageryLayer({
  url: "https://sampleserver6.arcgisonline.com/arcgis/rest/services/ScientificData/SeaTemperature/ImageServer",
  timeExtent: {
    start: new Date(2014, 4, 18),
    end: new Date(2014, 4, 19)
  },
  useViewTime: false
});

// timeExtent is set on the layer and the view
// In this case, the layer will display features that fall
// within the intersection of view and layer time extents
// features within Jan 1, 1976 - Jan 1, 1981 will be displayed
const view = new MapView({
  timeExtent: {
    start: new Date(1976, 0, 1),
    end: new Date(2002, 0, 1)
  }
});
const layer = new FeatureLayer({
  url: myUrl,
  timeExtent: {
    start: new Date(1974, 0, 1),
    end: new Date(1981, 0, 1)
  }
});

// create geojson layer from usgs earthquakes geojson feed
const geojsonLayer = new GeoJSONLayer({
  url: "https://earthquake.usgs.gov/earthquakes/feed/v1.0/summary/all_month.geojson",
  copyright: "USGS Earthquakes",
  fields: [
    { "name": "mag", "type": "double" },
    { "name": "place", "type": "string" },
    { "name": "time", "type": "date" }, // date field
    { "name": "depth", "type": "double" }
  ],
  // timeInfo can be used to do temporal queries
  // set the startField and endField.
  // timeExtent is automatically calculated from the
  // the start and end date fields
  // The date values must be in milliseconds number from the UNIX epoch specified in UTC.
  timeInfo: {
    startField: "time"
  }
});

// Offset a CSV Layer containing hurricanes from 2015 so that they appear in 2019 (+4 years).
let layer = new CSVLayer({
  url: `hurricanes-and-storms-2015.csv`,
  timeOffset: {
    value: 4,
    unit: "years"
  },
  timeInfo: {
    startField: "ISO_time"
  },
  renderer: {
    type: "simple",
    symbol: {
      type: "simple-marker",
      size: 6,
      color: "red",
      outline: {
        width: 0.5,
        color: "black"
      }
    }
  }
});

// Hosted Feature Service on ArcGIS Online
layer.url = "http://services.arcgis.com/V6ZHFr6zdgNZuVG0/arcgis/rest/services/origins/FeatureServer/0";

// Layer from Map Service on ArcGIS Server
layer.url = "http://sampleserver6.arcgisonline.com/arcgis/rest/services/Census/MapServer/2";

// Can also be used if URL points to service and not layer
const layer = new FeatureLayer({
  // Notice that the url doesn't end with /2
  url: "http://services.arcgis.com/V6ZHFr6zdgNZuVG0/arcgis/rest/services/MonterreyBayCanyon_WFL/FeatureServer",
  layerId: 2
});

// Non-spatial table in San Francisco incidents service.
const table = new FeatureLayer({
  url: "https://sampleserver6.arcgisonline.com/arcgis/rest/services/SF311/FeatureServer/1"
});
// table must be loaded so it can be used in the app.
table.load().then(function() {
  // table is loaded. ready to be queried.
});

if (featureLayer.useViewTime) {
  console.log("Displaying data between:", view.timeExtent.start, " - ", view.timeExtent.end);
}

// Prints the version number to the console - e.g. 10.2, 10.3, 10.41, etc.
console.log(layer.version);