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Map | API Reference | ArcGIS Maps SDK for JavaScript 4.33

ESM: import Map from "@arcgis/core/Map.js";

CDN: const Map = await $arcgis.import("@arcgis/core/Map.js");

Class: @arcgis/core/Map

Since: ArcGIS Maps SDK for JavaScript 4.0

The Map class contains properties and methods for storing, managing, and overlaying layers common to both 2D and 3D viewing. Layers can be added and removed from the map, but are rendered via a MapView (for viewing data in 2D) or a SceneView (for viewing data in 3D). Thus a map instance is a simple container that holds the layers, while the View is the means of displaying and interacting with a map's layers and basemap.

A single map may be referenced by multiple views. This sample for example, contains a single Map that is visible in two separate views - one in 2D and the other in 3D. Because one map may be accessed by multiple views in the same application, all user interaction with a map's layers is handled on the View, not the Map.

An instance of Map is an essential component of the MapView and SceneView. A Map object should be created prior to a view so it can be passed into the map property of that view (e.g. MapView.map, SceneView.map).

// Load the Map and MapView modules
const [Map, MapView] = await $arcgis.import(["@arcgis/core/Map.js", "@arcgis/core/views/MapView.js"]);
// Create a Map instance
const myMap = new Map({
  basemap: "streets-vector"
});
// Create a MapView instance (for 2D viewing) and reference the map instance
const view = new MapView({
  map: myMap
});

See also

Constructors

Map Constructor new Map(properties)

Parameter

optional

See the properties for a list of all the properties that may be passed into the constructor.

Example

// Typical usage
const map = new Map({
  basemap: "topo-vector"
});

Property Overview Any properties can be set, retrieved or listened to. See the Watch for changes topic.

Show inherited properties Hide inherited properties

Property Details

Example

// Find a layer with title "US Counties"
const foundLayer = map.allLayers.find(function(layer) {
 return layer.title === "US Counties";
});

// Create a filtered collection of the non-group layers
const nonGroupLayers = map.allLayers.filter(function(layer) {
 return !foundLayer.layers;
});

// Listen for any layer being added or removed in the Map
map.allLayers.on("change", function(event) {
 console.log("Layer added: ", event.added);
 console.log("Layer removed: ", event.removed);
 console.log("Layer moved: ", event.moved);
});

// Watching for changes to the visible layers in the Map
reactiveUtils.watch(
  () => view.map.allLayers.filter((layer) => layer.visible),
  (newVisibleLayers, oldVisibleLayers) => {
    const added = newVisibleLayers.filter(
      (layer) => !oldVisibleLayers.includes(layer)
    );
    const removed = oldVisibleLayers.filter(
      (layer) => !newVisibleLayers.includes(layer)
    );
    added.forEach((layer) => console.log(layer.title, "is visible"));
    removed.forEach((layer) => console.log(layer.title, "is not visible"));
  }
);

Since: ArcGIS Maps SDK for JavaScript 4.17 Map since 4.0, allTables added at 4.17.

A flattened collection of tables anywhere in the map's hierarchy. This will contain individual tables within the map's tables, in addition to any group layer tables. In order for the table(s) to be recognized as such, the FeatureLayer.isTable property must return true.

Currently, only feature layer tables are recognized.
To access spatial layers, use the allLayers property instead.

Example

// A feature layer where isTable = true.
const foundTable = map.allTables.find(function(table) {
  // Find a table with title "US Counties"
  return table.title === "US Counties";
});

Specifies a basemap for the map. The basemap is a set of layers that give geographic context to the MapView or SceneView and the other operational layers in the map.

The basemap can be created in a variety of ways:

From the basemap styles service (v2)
From an instance of the Basemap class
From a basemap id

Basemap Id 3D

Since version 4.28

The 3D Basemaps can be accessed using the basemap id in the table below. They are designed to be used as basemaps in SceneView.

Known Limitations

3D Basemaps can only be used in SceneView.

2D (legacy)

Since version 4.0

The legacy basemaps can be accessed using the basemap id in the table below. These are references to enhanced basemap endpoints.

Examples

// create the basemap from a string id representing the basemap style
const map = new Map({
  basemap: "arcgis/topographic"
});

// create the basemap from a BasemapStyle object
const map = new Map({
 basemap: {
  style: {
   id:  "arcgis/outdoor",
   language: "es" // place labels will be displayed in spanish
  }
 }
});

// Set the basemap from a string ID in the constructor
const map = new Map({
  basemap: "dark-gray-3d"
});

// Set the basemap after the map instance is created
map.basemap = "topo-3d";

// Create a VectorTileLayer from a style URL
const mapBaseLayer = new VectorTileLayer({
  url: "https://arcgis.com/sharing/rest/content/items/b5676525747f499687f12746441101ef/resources/styles/root.json"
});

// Create a Basemap with the VectorTileLayer
const customBasemap = new Basemap({
  baseLayers: [mapBaseLayer],
  title: "Terrain"
});

// Set the basemap to the customBasemap
const map = new Map({
  basemap: customBasemap
});

declaredClass Inherited Property declaredClass Stringreadonly Since: ArcGIS Maps SDK for JavaScript 4.7 Accessor since 4.0, declaredClass added at 4.7.: The name of the class. The declared class name is formatted as esri.folder.className.

Since: ArcGIS Maps SDK for JavaScript 4.20 Map since 4.0, editableLayers added at 4.20.: A collection of editable layers. Layers are considered editable if they have editing capabilities, and if the authenticated user has the necessary privileges needed to edit the layers.

A container of all focus areas present in the map.

Known Limitations

Focus areas are only supported in SceneView.

Specifies the surface properties for the map. In MapView, this property is used by the ElevationProfile widget when the profile contains an ElevationProfileLineGround. In 3D SceneView, it renders the terrain or topographical variations in the real world on the map's surface with a collection of ElevationLayers.

This value can be an instance of Ground, or one of the following strings:

world-elevation for a default instance of ground using the Terrain3D Service.
world-topobathymetry for an instance of ground that combines surface elevation and bathymetry using the TopoBathy3D Service.

The ground may not be set to null or undefined, it is guaranteed to always contain an instance of type Ground. The elevation can be removed from the ground by setting the ground property to a new empty Ground instance or by removing all the ground layers.

Examples

// Use the world elevation service
const map = new Map({
  basemap: "topo-vector",
  ground: "world-elevation"
});

// Create a map with the world elevation layer overlaid by a custom elevation layer
const worldElevation = new ElevationLayer({
  url: "//elevation3d.arcgis.com/arcgis/rest/services/WorldElevation3D/Terrain3D/ImageServer"
});
const customElevation = new ElevationLayer({
  url: "https://my.server.com/arcgis/rest/service/MyElevationService/ImageServer"
});
const map = new Map({
  basemap: "topo-vector",
  ground: new Ground({
   layers: [ worldElevation, customElevation ]
  })
});

A collection of operational layers. This property contains the operational layers, such as FeatureLayers, WebTileLayers and GraphicsLayers that may be queried, assigned different renderers, analyzed, etc. It does not include basemaps.

A layer is a collection of one or more features, or graphics, that represent real-world phenomena. Each feature contains a symbol and geographic data that allows it to be rendered on the map as a graphic with spatial context. Features within the layer may also contain data attributes that provide additional information that may be viewed in popup windows and used for rendering the layer.

Layers may be added in the constructor, with the add() or addMany() methods, or directly to the layers collection using add() or addMany().

In 3D, for layers that are rendered on the terrain, the order of the layers also depends on the type of layer. Tiled layers (BaseTileLayer, ImageryTileLayer, OpenStreetMapLayer, TileLayer, VectorTileLayer, WCSLayer, WebTileLayer and WMTSLayer) are always drawn first in the same order as specified in the layer collection. Dynamic layers (MapImageLayer, ImageryLayer, WMSLayer, and feature based layers with elevation mode on-the-ground) are rendered on top using the order from the layer collection.

A layer may only be added to one parent. Adding the same layer to multiple Maps or GroupLayers is not possible. If you attempt to do so, the layer will automatically be removed from its current parent and placed in the new parent.

let layer = new GraphicsLayer();
// The layer belongs to map1
map1.layers.add(layer);
// The layer now belongs to map2
// and implicitly does: map1.layers.remove(layer)
map2.layers.add(layer);

Example

// Add layers in the constructor of Map using an array
let fl = new FeatureLayer(url);
let gl = new GraphicsLayer();
let map = new Map({
  layers: [fl, gl]
});

// Add layers using add()
map.addMany([fl, gl]);

// Add layers using layers collection
map.layers.addMany([fl, gl]);

// Add layers using layers collection's push method
map.layers.push(fl, gl);

A collection of layer instances that are tables saved in a Map and/or a WebMap. In order for the table(s) to be recognized as such, the FeatureLayer's isTable property must return true. A table can be created via one of the options below:

Referencing the URL to a table in a feature service.
Create a feature layer using the Layer.fromArcGISServerUrl method and confirm that it is a table using feature layer's isTable property. This can be either a feature service or feature collection.
Create a feature layer using the Layer.fromPortalItem method and confirm that it is a table using feature layer's isTable property. This can be either a feature service or feature collection.
Create an in-memory, non-spatial, client-side feature layer.

Beginning with 4.17, it is possible to persist non-spatial, tables in a feature service to a WebMap, although in-memory (feature collection) tables are not yet supported.

Persisting tables within a GroupLayer is not yet supported. If this is needed, add them to the Map and/or WebMap.

Currently, only feature service feature layers are recognized.
To access spatial layers, use the layers property in either Map or WebMap classes

Examples

// This snippet shows how to add a table to a map's table collection.

// FeatureLayer.isTable = false
const featureLayer = new FeatureLayer({
  url: "https://sampleserver6.arcgisonline.com/arcgis/rest/services/SF311/FeatureServer/0"
});
// Add featureLayer to the map
map.add(featureLayer);

// FeatureLayer.isTable = true
const table = new FeatureLayer({
  url: "https://sampleserver6.arcgisonline.com/arcgis/rest/services/SF311/FeatureServer/1"
});

// In order for the table to be stored within
// the map's table collection, load it and confirm it is the right type.

table.load().then(() => {
  // Add the table to the collection
  map.tables.add(table);
  console.log("Table is added to map's table collection");
});

// This snippet shows how to persist a table to an existing web map

// FeatureLayer.isTable = true
const table = new FeatureLayer({
  url: "https://services.arcgis.com/V6ZHFr6zdgNZuVG0/arcgis/rest/services/Crash_details_table/FeatureServer/0"
});

// Create Webmap instance
const webmap = new WebMap({
  portalItem: {
    id: webmapId
  }
});

// When web map is ready, load the table and add it to the web map
webmap.when(() => {
  table.load().then(() => {
    console.log("Adding table");
    // Add table to the webmap's table collection
    webmap.tables.add(table);
  });
});

// Call updateFrom on webmap and pass in the existing view
webmap.updateFrom(view).then(() => {
  // Call saveAs (or save) on the web map
  webmap.saveAs({
    // autocasts as new PortalItem()
    title: "New WebMap"
  });
});

// This snippet shows how to add an in-memory table to a map

// Create the array of objects containing field info
const fields = [{
  name: "ObjectID",
  alias: "ObjectID",
  type: "oid"
},
{
  name: "tree_type",
  alias: "Tree type",
  type: "string"
},
{
  name: "species",
  alias: "Species",
  type: "string"
}];

// Create the array of graphics holding attribute info
const graphics = [{
  attributes: {
    "tree_type": "deciduous",
    "species": "maple",
    "ObjectID": 2
  }
}, {
  attributes: {
    "tree_type": "coniferous",
    "species": "pine",
    "ObjectID": 3
  }
}];

// Create the feature layer (feature collection) table
const table = new FeatureLayer({
  fields: fields,
  objectIdField: "ObjectID",
  source: graphics
});

// Check when map is ready and load the table
map.when(() => {
  table.load().then(() => {
    console.log("Adding table");
    map.tables.add(table);
  });
});

Method Overview

Show inherited methods Hide inherited methods

Method Details

add Method add(layer, index)

Adds a layer to the layers collection. The before-changes, before-add, after-add, after-changes and change events will be emitted when this method is called.

Parameters

Layer or a promise that resolves to a layer to add to the layers collection.

optional

A layer can be added at a specified index in the layers collection. If no index is specified or the index specified is greater than the current number of layers, the layer is automatically appended to the list of layers in the layers collection and the index is normalized.

Example

// add() and push methods can be used
// to add a layer to layers collection

// add a layer to layers collection using add
map.add(layer);

// add a layer at the end of layers collection
map.layers.push(layer);

addHandles Inherited Method addHandles(handleOrHandles, groupKey) Since: ArcGIS Maps SDK for JavaScript 4.25 Accessor since 4.0, addHandles added at 4.25.

Adds one or more handles which are to be tied to the lifecycle of the object. The handles will be removed when the object is destroyed.

// Manually manage handles
const handle = reactiveUtils.when(
  () => !view.updating,
  () => {
    wkidSelect.disabled = false;
  },
  { once: true }
);

this.addHandles(handle);

// Destroy the object
this.destroy();

Parameters

Handles marked for removal once the object is destroyed.

groupKey *

optional

Key identifying the group to which the handles should be added. All the handles in the group can later be removed with Accessor.removeHandles(). If no key is provided the handles are added to a default group.

addMany Method addMany(layers, index)

Parameters

Layer(s) to be added to the layers collection.

optional

Example

// addMany and push methods can be used
// to add layers to layers collection

// add an array of layers to layers collection using addMany
map.addMany([layer, layer2]);

// add layers to layers collection using push method
map.layers.push(layer, layer2);

Since: ArcGIS Maps SDK for JavaScript 4.17 Map since 4.0, destroy added at 4.17.

Destroys the map, and any associated resources, including its layers, basemap, tables, and ground. These can no longer be used once the map has been destroyed. To prevent these objects from being destroyed, remove them from the map before calling destroy().

// prevent the layers from being destroyed by removing them from the map
const layers = map.layers.removeAll();

// prevent the tables from being destroyed by removing them from the map
const tables = map.tables.removeAll();

// unset basemap from the map so that it is not destroyed
const basemap = map.basemap;
map.basemap = null;

// remove ground layers from the map so that they aren't destroyed
const groundLayers = map.ground.removeAll();

// destroy the map and any remaining associated resources
map.destroy();

Returns a layer based on the given layer ID.

Parameter

The ID assigned to the layer.

Returns

Since: ArcGIS Maps SDK for JavaScript 4.18 Map since 4.0, findTableById added at 4.18.

Returns a table based on the given table ID.

Parameter

The ID assigned to the table.

Returns

hasHandles Inherited Method hasHandles(groupKey){Boolean} Since: ArcGIS Maps SDK for JavaScript 4.25 Accessor since 4.0, hasHandles added at 4.25.

Returns true if a named group of handles exist.

Parameter

groupKey *

optional

A group key.

Returns

Type Description Boolean Returns true if a named group of handles exist.

Example

// Remove a named group of handles if they exist.
if (obj.hasHandles("watch-view-updates")) {
  obj.removeHandles("watch-view-updates");
}

removeHandles Inherited Method removeHandles(groupKey) Since: ArcGIS Maps SDK for JavaScript 4.25 Accessor since 4.0, removeHandles added at 4.25.

Removes a group of handles owned by the object.

Parameter

groupKey *

optional

A group key or an array or collection of group keys to remove.

Example

obj.removeHandles(); // removes handles from default group

obj.removeHandles("handle-group");
obj.removeHandles("other-handle-group");

Changes the layer order. The first layer added is always the base layer, even if its order is changed. The change event will be emitted when this method is called.

Parameters

The layer to be moved.

The index location for placing the layer. The bottom-most layer has an index of 0.

Returns

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