LinkChartView | API Reference | ArcGIS Maps SDK for JavaScript 4.31

LinkChartView is a 2D view that displays a WebLinkChart. A LinkChartView instance must be created to render a WebLinkChart. For a map to be visible to the user in the DOM, a LinkChartView must be created and reference a minimum of two objects: a WebLinkChart instance and a DOM element. Each is set in the map and container properties respectively.

See also

Example

// Create a new LinkChartView
const view = new LinkChartView({
  container: "viewDiv",
  map: new WebLinkChart({
    portalItem: {
      id: "e62b3b3c9e37400d91648fb0a8801e8a",
    }
  })
});

Constructors

LinkChartView Constructor new LinkChartView(properties)

Parameter

properties Object

optional

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

Property Overview

Any properties can be set, retrieved or listened to. See the Working with Properties topic.

Show inherited properties

Hide inherited properties

Type	Summary	Class
Collection<LayerView>	Collection containing a flat list of all the created LayerViews related to the basemap, operational layers, and group layers in this view.	View
ViewAnimation	Represents an ongoing view animation initialized by goTo().	View2D
ColorBackground	The background color of the MapView.	View2D
BasemapView	Represents the view for a single basemap after it has been added to the map.	View
Object	A convenience property used for defining the breakpoints on the height and width of the view.	View2D
Point	Represents the view's center point; when setting the center, you may pass a Point instance or an array of numbers representing a longitude/latitude pair (`[-100.4593, 36.9014]`).	View2D
Object	Specifies constraints to scale, zoom, and rotation that may be applied to the MapView.	View2D
HTMLDivElement	The `id` or node representing the DOM element containing the view.	View
String	The name of the class.	Accessor
Extent	The extent represents the visible portion of a map within the view as an instance of Extent.	View2D
Error	A fatal error returned when the view loses its WebGL context.	View
Collection<string>	Applies a display filter on the view for a specific set of floor levels.	View2D
Boolean	Indicates if the browser focus is on the view.	View
Collection<Graphic>	Allows for adding graphics directly to the default graphics in the View.	View
Number	The height of the view in pixels read from the view container element.	View
String	A convenience property indicating the general size of the view's height.	View2D
HighlightOptions	Options for configuring the highlight.	View2D
Input	Options to configure input handling of the View.	View
Boolean	Indication whether the view is being interacted with (for example when panning or by an interactive tool).	View
Collection<LayerView>	A collection containing a hierarchical list of all the created LayerViews of the operational layers in the map.	View
Magnifier	The magnifier allows for showing a portion of the view as a magnifier image on top of the view.	View
WebLinkChart	The WebLinkChart displayed in the view.	LinkChartView
Boolean	Indication whether the view is being navigated (for example when panning).	View
Navigation	Options to configure the navigation behavior of the View.	View
String	A convenience property indicating the view's orientation.	View2D
Object	Use the padding property to make the center, and extent, etc.	View
Popup	A Popup object that displays general content or attributes from layers in the map.	View2D
Boolean	Controls whether the popup opens when users click on the view.	View2D
Boolean	When `true`, this property indicates whether the view successfully satisfied all dependencies, signaling that the following conditions are met.	View
String	Defines which anchor stays still while resizing the browser window.	View2D
Boolean	Indicates if the view is being resized.	View
Number	Represents the size of one pixel in map units.	View2D
Number	The clockwise rotation of due north in relation to the top of the view in degrees.	View2D
Number	Represents the map scale at the center of the view.	View2D
Number []	An array containing the width and height of the view in pixels, e.g.	View
SpatialReference	The spatial reference of the view.	View2D
Boolean	Indicates if the MapView's spatialReference can be changed after it is initialized.	View2D
Boolean	Indication whether the view is animating, being navigated with or resizing.	View
Boolean	Indicates if the view is visible on the page.	View
Theme	This property specifies the base colors used by some widgets and components to render graphics and labels.	View
TileInfo	The tiling scheme information of the view.	View2D
TimeExtent	The view's time extent.	View
String	Defines the time zone of the view.	View2D
DefaultUI	Exposes the default widgets available in the view and allows you to toggle them on and off.	View
Boolean	Indicates whether the view is being updated by additional data requests to the network, or by processing received data.	View
Viewpoint	Represents the current view as a Viewpoint or point of observation on the view.	View2D
Polygon	The visibleArea represents the visible portion of a map within the view as an instance of a Polygon.	View2D
Number	The width of the view in pixels read from the view container element.	View
String	A convenience property indicating the general size of the view's width.	View2D
Number	Represents the level of detail (LOD) at the center of the view.	View2D

Property Details

allLayerViews Inherited Property allLayerViews Collection<LayerView> Inherited from View

Collection containing a flat list of all the created LayerViews related to the basemap, operational layers, and group layers in this view.

See also

LayerView

animation Inherited Property animation ViewAnimation Inherited from View2D

Represents an ongoing view animation initialized by goTo(). You may watch this property to be notified of the animation's state.

See also

goTo()

Example

reactiveUtils.watch(
  () => view.animation,
  (response) => {
    if(response?.state === "running"){
      console.log("Animation in progress");
    } else{
     console.log("No animation");
    }
  }
);

background Inherited Property background ColorBackgroundautocast Inherited from View2D

The background color of the MapView. If the view's map changes, the view's background is reset to the map's background, even if the user set it previously.

Default Value:null

Example

let view = new MapView({
  container: "viewDiv",
  map: map,
  background: { // autocasts new ColorBackground()
    color: "magenta" // autocasts as new Color()
  }
});

basemapView Inherited Property basemapView BasemapView Inherited from View

Represents the view for a single basemap after it has been added to the map.

breakpoints Inherited Property breakpoints Object Inherited from View2D

A convenience property used for defining the breakpoints on the height and width of the view. The sizes specified here determine the values of the widthBreakpoint and heightBreakpoint properties depending on the view's size.

Setting up breakpoints can aid in responsive app design. It does this by watching width and height breakpoints. This is helpful as it removes the need for multiple @media calls. Instead of listening for the view's size and/or resizes property, you can set up a watch handler for either the widthBreakpoint or heightBreakpoint properties of the view.

Please refer to the styling guide for additional information on working with this.

Properties

xsmall Number

optional

Default Value:544

Sets the xsmall breakpoint in pixels used by widthBreakpoint and heightBreakpoint. If the view's height or width is smaller than this value, then the value of widthBreakpoint or heightBreakpoint will be xsmall.

small Number

optional

Default Value:768

Sets the small breakpoint in pixels used by widthBreakpoint and heightBreakpoint. If the view's height or width is between this value and the value of the xsmall property, then the value of widthBreakpoint or heightBreakpoint will be small.

medium Number

optional

Default Value:992

Sets the medium breakpoint in pixels used by widthBreakpoint and heightBreakpoint. If the view's height or width is between this value and the value of the small property, then the value of widthBreakpoint or heightBreakpoint will be medium.

large Number

optional

Default Value:1200

Sets the large breakpoint in pixels used by widthBreakpoint and heightBreakpoint. If the view's height or width is between this value and the value of the medium property, then the value of widthBreakpoint or heightBreakpoint will be large.

xlarge Number

optional

Sets the xlarge breakpoint in pixels used by widthBreakpoint and heightBreakpoint. If the view's height or width is greater than the value of the large property, then the value of widthBreakpoint or heightBreakpoint will be xlarge.

See also

Example

// Instead of watching the size or resizing properties
reactiveUtils.watch(() => view.size, () => {});
reactiveUtils.watch(() => view.resizing, () => {});

// Set up a watch handle for breakpoint
reactiveUtils.watch(
  () => view.widthBreakpoint,
  (breakpoint) => {
    switch (breakpoint) {
      case "xsmall":
      // do something
        break;
      case "small":
      case "medium":
      case "large":
      case "xlarge":
      // do something else
        break;
      default:
    }
  }
);

center Inherited Property center Pointautocast Inherited from View2D Autocasts from Number []|Object

Represents the view's center point; when setting the center, you may pass a Point instance or an array of numbers representing a longitude/latitude pair ([-100.4593, 36.9014]). Setting the center immediately changes the current view. For animating the view, see goTo().

The returned Point object is always in the spatial reference of the view and may be modified internally. To persist the returned object, create a clone using Point.clone().

Notes

If the spatial reference of center set in the constructor does not match the spatialReference of the view, then projection engine will be loaded dynamically.
At runtime, the projection engine must be loaded when setting the center to a spatial reference that doesn't match the view spatial reference. You can check if the projection engine is loaded prior to setting the center by calling projection.isLoaded(). If it is not yet loaded, you can call projection.load().

See also

goTo()

Examples

// Sets the initial center point of the view to lon/lat coordinates
// lon/lat will be projected to match the spatial reference of the view
let view = new MapView({
  center: [-112, 38]
});

// Updates the view's center point to a pre-determined Point object
let pt = new Point({
  x: 12804.24,
  y: -1894032.09,
  spatialReference: {
    wkid: view.spatialReference  // wkid 2027
  }
});
view.center = pt;

const centerPoint = new Point({
  x: -8746995,
  y: 4352308,
  spatialReference: {
    wkid: 8857
  }
});
if (!projection.isLoaded()) {
  // load the projection engine if it is not loaded
  await projection.load();
}
view.center = centerPoint;

constraints Inherited Property constraints Object Inherited from View2D

Specifies constraints to scale, zoom, and rotation that may be applied to the MapView. The constraints.lods should be set in the MapView constructor, if the map does not have a basemap or when the basemap does not have tileInfo. See Zoom and LODs section to learn more how MapView's zoom and LODs work. See the object specification below.

Properties

lods LOD []|null

optional

An array of LODs. If not specified, this value is read from the Map. It is possible to generate additional LODs via the TileInfo.create() method. This is useful in cases where the default amount of LODs provided are not sufficient. One example of when this is needed is when setting the view scale 1:1. Additionally, this property may be autocast.

geometry Geometry|null

optional

The area in which the user is allowed to navigate laterally. Only Extent and Polygon geometry types are supported. Z-values are ignored. This property is honored by interactive MapView navigation and goTo(). This property may be autocast.

minScale Number

optional

The minimum scale the user is allowed to zoom to within the view.

maxScale Number

optional

The maximum scale the user is allowed to zoom to within the view. Setting this value to 0 allows the user to overzoom layer tiles.

minZoom Number

optional

The minimum zoom level the user is allowed to zoom to within the view.

maxZoom Number

optional

The maximum zoom level the user is allowed to zoom to within the view. Setting this value to 0 allows the user to over-zoom layer tiles.

snapToZoom Boolean

optional

Default Value:true

When true, the view snaps to the next LOD when zooming in or out. When false, the zoom is continuous. This does not apply when zooming in/out using two finger pinch in/out.

rotationEnabled Boolean

optional

Default Value:true

Indicates whether the user can rotate the map.

effectiveLODs LOD []|null

optional

A read-only property that specifies the levels of detail (LODs) read from the Map.

effectiveMinZoom Number

optional

A read-only property that specifies the minimum zoom level the user is allowed to zoom to within the view.

effectiveMaxZoom Number

optional

A read-only property that specifies the maximum zoom level the user is allowed to zoom to within the view.

effectiveMinScale Number

optional

A read-only property that specifies the minimum scale the user is allowed to zoom to within the view.

effectiveMaxScale Number

optional

A read-only property that specifies the maximum scale the user is allowed to zoom to within the view.

See also

Examples

view.constraints = {
  geometry: { // Constrain lateral movement to Lower Manhattan
    type: "extent",
    xmin: -74.020,
    ymin:  40.700,
    xmax: -73.971,
    ymax:  40.73
  },
  minScale: 500000, // User cannot zoom out beyond a scale of 1:500,000
  maxScale: 0, // User can overzoom tiles
  rotationEnabled: false // Disables map rotation
};

// This snippet shows how to set the MapView scale 1:1 while generating additional LODs for the MapView.constraints.
const spatialReference = new SpatialReference({
  wkid: 2154
});
const center = new Point({
  x: 0,
  y: 0,
  spatialReference
});

// Create LODs from level 0 to 31
const tileInfo = TileInfo.create({
  spatialReference,
  numLODs: 32
});
const lods = tileInfo.lods;

let view = new MapView({
  container: "viewDiv",
  map,
  scale: 1,
  center,
  spatialReference,
  constraints: {
    lods: lods,
    snapToZoom: false
  }
});

container Inherited Property container HTMLDivElementautocast Inherited from View Autocasts from String

The id or node representing the DOM element containing the view. This is typically set in the view's constructor.

Examples

// Sets container to the DOM id
let view = new MapView({
  container: "viewDiv"  // ID of the HTML element that holds the view
});

// Sets container to the node
let viewNode = document.getElementById("viewDiv");
let view = new SceneView({
  container: viewNode
});

declaredClass Inherited Property declaredClass Stringreadonly Inherited from Accessor

The name of the class. The declared class name is formatted as esri.folder.className.

extent Inherited Property extent Extentautocast Inherited from View2D

The extent represents the visible portion of a map within the view as an instance of Extent. Setting the extent immediately changes the view without animation. To animate the view, see goTo(). When the view is rotated, the extent does not update to include the newly visible portions of the map.

The returned Extent object is an internal reference which may be modified internally. To persist the returned object, create a copy using Extent.clone().

Notes

If the spatial reference of extent set in the constructor does not match the spatialReference of the view, then projection engine will be loaded dynamically.
At runtime, the projection engine must be loaded when setting the extent to a spatial reference that doesn't match the view spatial reference. You can check if the projection engine is loaded prior to setting the extent by calling projection.isLoaded(). If it is not yet loaded, you can call projection.load().

Default Value:null

See also

goTo()

Example

// the projection engine must be loaded in the app if the spatial reference
// of the view does not match the spatial reference of the extent
const extent = new Extent({
  xmin: -13056650,
  ymin: 6077558,
  xmax: -13055709,
  ymax: 6077938,
  spatialReference: new SpatialReference({wkid:3857})
});
view.extent = extent;  // Updates the view without animation

fatalError Inherited Property fatalError Error Inherited from View

A fatal error returned when the view loses its WebGL context. Watch this property to properly handle the error and attempt to recover the WebGL context.

See also

tryFatalErrorRecovery()

Example

reactiveUtils.when(
  () => view.fatalError,
  () => {
    console.error("Fatal Error! View has lost its WebGL context. Attempting to recover...");
    view.tryFatalErrorRecovery();
  }
);

floors Inherited Property floors Collection<string> Inherited from View2D

Applies a display filter on the view for a specific set of floor levels. It can filter the map display on floor-aware layers by zero or more level IDs.

focused Inherited Property focused Booleanreadonly Inherited from View

Indicates if the browser focus is on the view.

graphics Inherited Property graphics Collection<Graphic> Inherited from View

Allows for adding graphics directly to the default graphics in the View.

See also

Examples

// Adds a graphic to the View
view.graphics.add(pointGraphic);

// Removes a graphic from the View
view.graphics.remove(pointGraphic);

height Inherited Property height Numberreadonly Inherited from View

The height of the view in pixels read from the view container element.

The view container needs to have a height greater than 0 to be displayed.

Default Value:0

heightBreakpoint Inherited Property heightBreakpoint String Inherited from View2D

A convenience property indicating the general size of the view's height. This value is determined based on where the view's height falls in the ranges defined in the breakpoints property. See the table below for a list of possible values. Use the breakpoints property to override the default thresholds.

Please refer to the styling guide for additional information on working with this.

Possible Value	Description	Default thresholds (pixels)
xsmall	The height of the view is smaller than the value set in the `xsmall` breakpoint.	< 545
small	The height of the view is between the values set in the `xsmall` and `small` breakpoints.	545 - 768
medium	The height of the view is between the values set in the `small` and `medium` breakpoints.	769 - 992
large	The height of the view is between the values set in the `medium` and `large` breakpoints.	993 - 1200
xlarge	The height of the view is larger than the value set in the `large` breakpoint.	> 1200

Possible Values:"xsmall" |"small" |"medium" |"large" |"xlarge"

See also

Example

reactiveUtils.watch(
  () => view.heightBreakpoint === "xsmall",
  () => {
    // clear the view's default UI components if
    // the app is used on a mobile device
    view.ui.components = [];
  }
);

highlightOptions Inherited Property highlightOptions HighlightOptions Inherited from View2D

Options for configuring the highlight. Use the highlight method on the appropriate LayerView to highlight a feature. The layerView's highlightOptions will take precedence over the MapView's highlightOptions if both properties are set.

See also

Example

const view = new MapView({
  map: map,
  highlightOptions: {
    color: [255, 255, 0, 1],
    haloOpacity: 0.9,
    fillOpacity: 0.2
  }
});

input Inherited Property input Inputreadonly Inherited from View

Options to configure input handling of the View.

Example

// Make gamepad events to emit independently of focus.
view.input.gamepad.enabledFocusMode = "none";

interacting Inherited Property interacting Booleanreadonly Inherited from View

Indication whether the view is being interacted with (for example when panning or by an interactive tool).

Default Value:false

layerViews Inherited Property layerViews Collection<LayerView> Inherited from View

A collection containing a hierarchical list of all the created LayerViews of the operational layers in the map.

See also

LayerView

magnifier Inherited Property magnifier Magnifierreadonly Inherited from View

The magnifier allows for showing a portion of the view as a magnifier image on top of the view.

map Property map WebLinkChart

The WebLinkChart displayed in the view.

navigating Inherited Property navigating Booleanreadonly Inherited from View

Indication whether the view is being navigated (for example when panning).

Default Value:false

navigation Inherited Property navigation Navigation Inherited from View

Options to configure the navigation behavior of the View.

Example

// Disable the gamepad usage, single touch panning, panning momentum and mouse wheel zooming.
const view = new MapView({
  container: "viewDiv",
  map: new Map({
    basemap: "satellite"
  }),
  center: [176.185, -37.643],
  zoom: 13,
  navigation: {
    gamepad: {
      enabled: false
    },
    browserTouchPanEnabled: false,
    momentumEnabled: false,
    mouseWheelZoomEnabled: false
  }
});

orientation Inherited Property orientation Stringreadonly Inherited from View2D

A convenience property indicating the view's orientation. See the table below for a list of possible values.

Please refer to the styling guide for additional information on working with this.

Possible Value	Description
landscape	The width of the view is greater than its height.
portrait	The width of the view is equal to or smaller than its height.

Possible Values:"landscape" |"portrait"

padding Inherited Property padding Object Inherited from View

Use the padding property to make the center, and extent, etc. work off a subsection of the full view. This is particularly useful when layering UI elements or semi-transparent content on top of portions of the view. See the view padding sample for an example of how this works.

Properties

left Number

optional

The left padding (in pixels).

top Number

optional

The top padding (in pixels).

right Number

optional

The right padding (in pixels).

bottom Number

optional

The bottom padding (in pixels).

Default Value:{left: 0, top: 0, right: 0, bottom: 0}

See also

Sample - View padding

popup Inherited Property popup Popup Inherited from View2D

A Popup object that displays general content or attributes from layers in the map.

By default, the popup property is an empty object that allows you to set the popup options. A Popup instance is automatically created and assigned to the view's popup when the user clicks on the view and popupEnabled is true, when the view.openPopup() method is called, or when some widgets need the popup, such as Search. If popup is null, the popup instance will not be created.

See also

Examples

// Set the view's popup to a new Popup instance.
// The popup will show anytime a popup is called such as when selecting features or displaying a Search result.
view.popup = new Popup();

// Set the popup to a PopupOptions object with popup properties set such as the dock options.
// The popup will show anytime a popup is called.
view.popup = {
 dockEnabled: true,
 dockOptions: {
   position: "top-left",
   breakpoint: false
 }
};

// Set the popup to null. This disables the popup so it will never show up.
view.popup = null;

popupEnabled Inherited Property popupEnabled Boolean Inherited from View2D

Controls whether the popup opens when users click on the view.

When true, a Popup instance is created and assigned to view.popup the first time the user clicks on the view, unless popup is null. The popup then processes the click event.

When false, the click event is ignored and popup is not created for features but will open for other scenarios that use a popup, such as displaying Search results.

Default Value:true

See also

popup
openPopup

Example

// Disable the popup from automatically appearing and
// open the popup manually using a click event.
view.popupEnabled = false;
view.on("click", (event)=> {
  view.openPopup({
    // Set properties for the manually opened popup
    ...
  });
});

ready Inherited Property ready Booleanreadonly Inherited from View

When true, this property indicates whether the view successfully satisfied all dependencies, signaling that the following conditions are met.

The view has a map. If map is a WebMap or a WebScene, then the map or scene must be loaded.
The view has a container with a size greater than 0.
The view has a spatialReference, a center, and a scale. These also can be inferred by setting an extent.

When a view becomes ready it will resolve itself and invoke the callback defined in when() where code can execute on a working view. Subsequent changes to a view's readiness would typically be handled by watching view.ready and providing logic for cases where the map or container change.

Default Value:false

See also

when()

resizeAlign Inherited Property resizeAlign String Inherited from View2D

Defines which anchor stays still while resizing the browser window. The default, center, ensures the view's center point remains constantly visible as the window size changes. The other options allow the respective portion of the view to remain visible when the window's size is changed.

Default Value:"center"

resizing Inherited Property resizing Booleanreadonly Inherited from View

Indicates if the view is being resized.

Default Value:false

resolution Inherited Property resolution Numberreadonly Inherited from View2D

Represents the size of one pixel in map units. The value of resolution can be found by dividing the extent width by the view's width.

rotation Inherited Property rotation Number Inherited from View2D

The clockwise rotation of due north in relation to the top of the view in degrees. The view may be rotated by directly setting the rotation or by using the following mouse event: Right-click + Drag. Map rotation may be disabled by setting the rotationEnabled property in constraints to false. See the code snippet below for an example of this.

Default Value:0

Examples

// Due north is rotated 90 degrees, pointing to the right side of the view
view.rotation = 90;

// Due north is rotated 180 degrees, pointing to the bottom of the view
view.rotation = 180;

// Due north is rotated 270 degrees, pointing to the left side of the view
view.rotation = 270;

// Due north is rotated 0 degrees, pointing to the top of the view (the default)
view.rotation = 0; // 360 or multiple of 360 (e.g. 720) works here as well.

// Disables map rotation
view.constraints = {
  rotationEnabled: false
};

scale Inherited Property scale Number Inherited from View2D

Represents the map scale at the center of the view. Setting the scale immediately changes the view. For animating the view, see goTo().

See also

goTo()
Zoom and LODs

Example

view.scale = 24000;  // Sets the map scale in the view's center to 1:24,000

size Inherited Property size Number[]readonly Inherited from View

An array containing the width and height of the view in pixels, e.g. [width, height].

spatialReference Inherited Property spatialReference SpatialReferenceautocast Inherited from View2D

The spatial reference of the view. This indicates the projected or geographic coordinate system used to locate geographic features in the map. Starting at version 4.23, you can change the spatialReference of the MapView after it is initialized by either directly changing this property, or by changing the basemap from the BasemapGallery or BasemapToggle widgets. Set spatialReferenceLocked property to true to prevent users from changing the view's spatial reference at runtime.

Prior to changing the spatial reference, check if the projection engine is loaded by calling projection.isLoaded(). If it is not yet loaded, call projection.load() method. If the projection engine is not loaded, the view's center will default to [0, 0] in the new spatial reference of the view and a console error will be thrown.

Notes

LayerViews not compatible with the view's spatial reference are not displayed. In such case, the layer view's suspended property is true and spatialReferenceSupported property is false.
When setting view's spatial reference, the center, extent or viewpoint.targetGeometry properties are projected to the new spatial reference. The scale and rotation properties are adjusted to keep the content of the map at the same size and orientation on screen.
To ensure TileLayers and VectorTileLayers are displayed in a basemap correctly, the spatialReference of the MapView must be set match their tileInfo's spatial reference.
Switching spatial reference with an imageCoordinateSystem is not supported.

Default Value:null

See also

spatialReferenceLocked

Examples

// check if the projection engine is loaded
if (!projection.isLoaded()) {
  // load the projection engine if it is not loaded
  projection.load().then(() => {
   // change the spatial reference of the view to equal earth projection
    view.spatialReference = new SpatialReference({
      wkid: 54035 //equal earth projection
    });
  });
} else {
  // the projection engine is already loaded.
  // change the spatial reference of the view to equal earth projection
  view.spatialReference = new SpatialReference({
    wkid: 54035 //equal earth projection
  });
}

const basemap = await changeBasemap();
const spatialReference = await findSpatialReference(basemap);

// check if basemap has the same spatial reference as the view if they are not equal
// then check if the projection engine is loaded. load the projection engine if it is not loaded.
// If loaded, then simply change view.spatialReference to match the basemap spatialReference
if (spatialReference && !view.spatialReference.equals(spatialReference)) {
  if (!projection.isLoaded()) {
    // load the projection engine if it is not loaded
    await projection.load();
  }
  view.spatialReference = spatialReference;
}

// change the basemap
map.basemap = basemap;

async function changeBasemap() {
  let basemap;
  if (map.basemap.title === "OpenStreetMap Vector Basemap (Blueprint - WGS84)"){
    basemap = new Basemap({
      portalItem: { // Spilhaus - one ocean basemap
        id: "5639ccf22d4c4830ab815c4f9c9319bb"
      }
    });
  } else {
    basemap = osm84;
  }
  return basemap;
}

async function findSpatialReference(basemap) {
  await basemap.load();

  if (basemap.spatialReference) {
    return basemap.spatialReference;
  }

  const layer = basemap.baseLayers.at(0);

  if (!layer) {
    return null;
  }

  await layer.load();

  return layer.spatialReference;
}

spatialReferenceLocked Inherited Property spatialReferenceLocked Boolean Inherited from View2D

Indicates if the MapView's spatialReference can be changed after it is initialized. The default is false indicating the view's spatialReference can be changed at runtime. When true, basemaps with spatial references that do not match the MapView's spatial reference will be disabled in BasemapGallery and BasemapToggle widgets and the view spatialReference cannot be changed at runtime.

Default Value:false

See also

spatialReference

stationary Inherited Property stationary Booleanreadonly Inherited from View

Indication whether the view is animating, being navigated with or resizing.

suspended Inherited Property suspended Booleanreadonly Inherited from View

Indicates if the view is visible on the page. When true, the view is not visible and it stops rendering and updating data. Set to true when one of the following conditions are met:

if the view does not have a container,
if the view's height or width equal to 0,
if the view container's css style display is set to none (display:none).

When the view container's css style visibility is set to hidden, this property is set to false, and the view is hidden but it stills renders and updates data.

Default Value:true

theme Inherited Property theme Theme Inherited from View

This property specifies the base colors used by some widgets and components to render graphics and labels. This only affects those components that would otherwise use the default orange pattern.

Default Value:null

See also

Example

// Update the theme to use purple graphics
// and slightly transparent green text
view.theme = new Theme({
  accentColor: "purple",
  textColor: [125, 255, 13, 0.9]
});

tileInfo Inherited Property tileInfo TileInforeadonly Inherited from View2D

The tiling scheme information of the view.

timeExtent Inherited Property timeExtent TimeExtentautocast Inherited from View

The view's time extent. Time-aware layers display their temporal data that falls within the view's time extent. Setting the view's time extent is similar to setting the spatial extent because once the time extent is set, the view updates automatically to conform to the change.

Default Value:null

Example

// Create a csv layer from an online spreadsheet.
let csvLayer = new CSVLayer({
  url: "http://test.com/daily-magazines-sold-in-new-york.csv",
  timeInfo: {
    startField: "SaleDate" // The csv field contains date information.
  }
});

// Create a mapview showing sales for the last week of March 2019 only.
const view = new MapView({
  map: map,
  container: "viewDiv",
  timeExtent: {
    start: new Date("2019, 2, 24"),
    end:   new Date("2019, 2, 31")
  }
});

timeZone Inherited Property timeZone String Inherited from View2D

Defines the time zone of the view. The time zone property determines how dates and times are represented to the user, but the underlying data is unchanged. Changing the time zone will have the following effect:

Arcade: Arcade expressions referencing date values in labels, renderers, and forms will represent dates by default in the time zone of the view. When the view time zone is changed, the output of Arcade expressions working with dates may change to match the time zone of the view. The user can use the ChangeTimeZone Arcade function (e.g. ChangeTimeZone($feature.dateField, "system")) to display dates in another time zone regardless of web map time zone. Alternatively they can construct Date values in the context of a specific time zone (e.g. Date(2013, 1, 1, 10, 00, 00, 00, "UTC")).
Widgets: Date values, including values from date and timestamp-offset fields, will be displayed in the view's time zone by default in the following widgets: Bookmarks, Editor, Feature, FeatureForm, Features, FeatureTable, Legend, Popup and TimeSlider.

The time zone can be set to one of the following values:

Possible Values

Value	Description
system	Dates and times will be displayed in the time zone of the device or browser.
unknown	Dates and times will be displayed based on the time zone that has been defined for the layer. No adjustments are made to the display of date info. TimeSlider is disabled.
Specified IANA time zone	Dates and times will be displayed in the specified IANA time zone. See wikipedia - List of tz database time zones.

Default Value:"system"

See also

wikipedia - List of tz database time zones

Example

// Date and time will be displayed in Pacific/Auckland (NZ) time zone
const view = new MapView({
  map: map,
  container: "viewDiv",
  timeZone: "Pacific/Auckland"
});

ui Inherited Property ui DefaultUIautocast Inherited from View

Exposes the default widgets available in the view and allows you to toggle them on and off. See DefaultUI for more details.

Examples

let toggle = new BasemapToggle({
  view: view,
  nextBasemap: "hybrid"
});
// Adds an instance of BasemapToggle widget to the
// top right of the view.
view.ui.add(toggle, "top-right");

// Moves the zoom and BasemapToggle widgets to the
// bottom left of the view.
view.ui.move([ "zoom", toggle ], "bottom-left");

// Removes all the widgets from the bottom left of the view
view.ui.empty("bottom-left");

// Removes the compass widget from the view
view.ui.remove("compass");

// Removes all default UI components, except Attribution.
// Passing an empty array will remove all components.
view.ui.components = [ "attribution" ];

updating Inherited Property updating Booleanreadonly Inherited from View

Indicates whether the view is being updated by additional data requests to the network, or by processing received data.

Default Value:false

viewpoint Inherited Property viewpoint Viewpoint Inherited from View2D

Represents the current view as a Viewpoint or point of observation on the view. Setting the viewpoint immediately changes the current view. For animating the view, see goTo().

The returned Viewpoint object is an internal reference which may be modified internally. To persist the returned object, create a copy using Viewpoint.clone().

Notes

If the spatial reference of viewpoint set in the constructor does not match the spatialReference of the view, then projection engine will be loaded dynamically.
At runtime, the projection engine must be loaded when setting the viewpoint.targetGeometry to a spatial reference that doesn't match the view spatialReference. You can check if the projection engine is loaded prior to setting the viewpoint.targetGeometry by calling projection.isLoaded(). If it is not yet loaded, you can call projection.load().

See also

goTo()

visibleArea Inherited Property visibleArea Polygonreadonly Inherited from View2D

The visibleArea represents the visible portion of a map within the view as an instance of a Polygon. This is similar to the view extent but is a more accurate representation of the visible area especially when the view is rotated. An example use of the visible area is to spatially filter visible features in a layer view query.

See also

extent

width Inherited Property width Numberreadonly Inherited from View

The width of the view in pixels read from the view container element.

The view container needs to have a width greater than 0 to be displayed.

Default Value:0

widthBreakpoint Inherited Property widthBreakpoint String Inherited from View2D

A convenience property indicating the general size of the view's width. This value is determined based on where the view's width falls in the ranges defined in the breakpoints property. See the table below for a list of possible values. Use the breakpoints property to override the default thresholds.

Please refer to the styling guide for additional information on working with this.

Possible Value	Description	Default thresholds (pixels)
xsmall	The width of the view is smaller than the value set in the `xsmall` breakpoint.	< 545
small	The width of the view is between the values set in the `xsmall` and `small` breakpoints.	545 - 768
medium	The width of the view is between the values set in the `small` and `medium` breakpoints.	769 - 992
large	The width of the view is between the values set in the `medium` and `large` breakpoints.	993 - 1200
xlarge	The width of the view is larger than the value set in the `large` breakpoint.	> 1200

Possible Values:"xsmall" |"small" |"medium" |"large" |"xlarge"

See also

Example

reactiveUtils.when(
  () => view.widthBreakpoint === "xsmall",
  () => {
    // clear the view's default UI components if
    // the app is used on a mobile device
    view.ui.components = [];
  }
);

zoom Inherited Property zoom Number Inherited from View2D

Represents the level of detail (LOD) at the center of the view. A zoom level or scale is a number that defines how large or small the contents of a map appear in a map view. Zoom level is a number usually between 0 (global view) and 23 (very detailed view) and is used as a shorthand for predetermined scale values. A value of -1 means the view has no LODs. When setting the zoom value, map view converts it to the corresponding scale, or interpolates it if the zoom is a fractional number. MapView can display maps with different projections at a full range of scales, and so use scale rather than zoom level.

Setting the zoom immediately changes the current view. For animating the view, see goTo(). Setting this property in conjunction with center is a convenient way to set the initial extent of the view.

See also

goTo()
Understanding MapView lods

Examples

view.zoom = 3;  // Sets the LOD to 3 (small map scale)
view.zoom = 18; // Sets the LOD to 18 (large map scale)

// Set the zoom level and center in the constructor
let view = new MapView({
  zoom: 10,
  center: [-120, 34],
  map: map
});

Method Overview

Show inherited methods

Hide inherited methods

Return Type	Summary	Class
	Adds one or more handles which are to be tied to the lifecycle of the object.	Accessor
	Closes the popup.	View2D
	Destroys the view, and any associated resources, including its map, popup, and UI elements.	View
Boolean	Emits an event on the instance.	View
	Sets the focus on the view.	View
Promise	Sets the view to a given target.	View2D
Boolean	Indicates whether there is an event listener on the instance that matches the provided event name.	View
Boolean	Returns true if a named group of handles exist.	Accessor
Boolean	`isFulfilled()` may be used to verify if creating an instance of the class is fulfilled (either resolved or rejected).	View
Boolean	`isRejected()` may be used to verify if creating an instance of the class is rejected.	View
Boolean	`isResolved()` may be used to verify if creating an instance of the class is resolved.	View
Object	Registers an event handler on the instance.	View
Promise	Opens the popup at the given location with content defined either explicitly with `content` or driven from the PopupTemplate of input features.	View2D
	Removes a group of handles owned by the object.	Accessor
Point	Converts the given screen point to a map point.	View2D
ScreenPoint	Converts the given map point to a screen point.	View2D
	Call this method to clear any fatal errors resulting from a lost WebGL context.	View
Promise	`when()` may be leveraged once an instance of the class is created.	View
Promise<LayerView>	Gets the LayerView created on the view for the given layer.	View

Method Details

addHandles Inherited Method addHandles(handleOrHandles, groupKey) Inherited from Accessor

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

handleOrHandles WatchHandle|WatchHandle []

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.

closePopup Inherited Method closePopup() Inherited from View2D

Closes the popup.

See also

popup
openPopup

Example

// Closes the popup if it's open
if(view.popup.visible){
 view.closePopup();
}

destroy Inherited Method destroy() Inherited from View

Destroys the view, and any associated resources, including its map, popup, and UI elements. These can no longer be used once the view has been destroyed. To prevent these components from being destroyed, remove them from the view before calling destroy().

// remove popup and legend from the view so that they are not destroyed
const popup = view.popup;
view.popup = null;
view.ui.remove(legend);

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

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

See also

emit Inherited Method emit(type, event){Boolean} Inherited from View

Emits an event on the instance. This method should only be used when creating subclasses of this class.

Parameters

type String

The name of the event.

event Object

optional

The event payload.

Returns

Type	Description
Boolean	`true` if a listener was notified

focus Inherited Method focus() Inherited from View

Sets the focus on the view.

goTo Inherited Method goTo(target, options){Promise} Inherited from View2D

Sets the view to a given target. The target parameter can be one of the following:

[longitude, latitude] pair of coordinates
Geometry (or array of Geometry[])
Graphic (or array of Graphic[])
Viewpoint
Object with a combination of target, center, scale and rotation properties (with target being any of the types listed above). The center property is provided as a convenience to animate the MapView.center and is equivalent to specifying the target with the center Point.

This function returns a promise which resolves as soon as the new view has been set to the target. If the transition is animated, then the ongoing animation can be obtained using MapView.animation. If setting the view to the new target fails, the promise returned by the goTo() method rejects with an error. Use a catch statement, to handle the error:

view.goTo({
  center: [-126, 49]
})
.catch(function(error) {
  if (error.name != "AbortError") {
     console.error(error);
  }
});

If a tiled map service is used as the basemap and snapToZoom property is set to true in constraints, the goTo method will zoom in to fit the defined target. If snapToZoom property is set to false, the goTo method will zoom to the exact target.

Since 4.30: The goTo method now respects the user's preference for reduced motion. By default, goTo() will animate, but when the user expresses a preference for reduced motion, goTo() will navigate to the specified target without animation. It is possible to override the user's preference for reduced motion by configuring esriConfig.respectPrefersReducedMotion or on a per-call basis by specifying the animate property. However, if you override the user's preference for reduced motion, you should consider slowing down animations by adjusting the speedFactor or duration in the options parameter, or provide users with a way to slow down or stop the animation. Refer to implementing reduced motion in your applications for more information.

Parameters

target GoToTarget2D

The target location/viewpoint to animate to. When using an object for target, use the properties in GoToTarget2D.

options GoToOptions2D

optional

Animation options for controlling the duration and easing of the animation. See the properties defined in GoToOptions2D for object specifications.

Returns

Type	Description
Promise	A promise that resolves when the view's extent updates to the extent defined in `target`.

Examples

let pt = new Point({
  latitude: 49,
  longitude: -126
});

// go to the given point
view.goTo(pt);

let opts = {
  duration: 5000  // Duration of animation will be 5 seconds
};

// go to point at LOD 15 with custom duration
view.goTo({
  target: pt,
  zoom: 15
}, opts);

// go to same point using center and zoom
view.goTo({
  center: [-126, 49],
  zoom: 15
});

hasEventListener Inherited Method hasEventListener(type){Boolean} Inherited from View

Indicates whether there is an event listener on the instance that matches the provided event name.

Parameter

type String

The name of the event.

Returns

Type	Description
Boolean	Returns true if the class supports the input event.

hasHandles Inherited Method hasHandles(groupKey){Boolean} Inherited from Accessor

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");
}

isFulfilled Inherited Method isFulfilled(){Boolean} Inherited from View

isFulfilled() may be used to verify if creating an instance of the class is fulfilled (either resolved or rejected). If it is fulfilled, true will be returned.

Returns

Type	Description
Boolean	Indicates whether creating an instance of the class has been fulfilled (either resolved or rejected).

isRejected Inherited Method isRejected(){Boolean} Inherited from View

isRejected() may be used to verify if creating an instance of the class is rejected. If it is rejected, true will be returned.

Returns

Type	Description
Boolean	Indicates whether creating an instance of the class has been rejected.

isResolved Inherited Method isResolved(){Boolean} Inherited from View

isResolved() may be used to verify if creating an instance of the class is resolved. If it is resolved, true will be returned.

Returns

Type	Description
Boolean	Indicates whether creating an instance of the class has been resolved.

on Inherited Method on(type, modifiersOrHandler, handler){Object} Inherited from View

Registers an event handler on the instance. Call this method to hook an event with a listener. See the Events summary table for a list of listened events.

Parameters

type String|String []

The name of the event or events to listen for.

modifiersOrHandler String []|Function

Additional modifier keys to filter events. Please see Key Values for possible values. All the standard key values are supported. Alternatively, if no modifiers are required, the function will call when the event fires.

The following events don't support modifier keys: blur, focus, layerview-create, layerview-destroy, resize.

handler Function

optional

The function to call when the event is fired, if modifiers were specified.

Returns

Type Description

Object

Returns an event handler with a remove() method that can be called to stop listening for the event.

Property	Type	Description
remove	Function	When called, removes the listener from the event.

Example

view.on("click", function(event){
  // event is the event handle returned after the event fires.
  console.log(event.mapPoint);
});

// Fires `pointer-move` event when user clicks on "Shift"
// key and moves the pointer on the view.
view.on("pointer-move", ["Shift"], function(event){
  let point = view2d.toMap({x: event.x, y: event.y});
  bufferPoint(point);
});

openPopup Inherited Method openPopup(options){Promise} Inherited from View2D

Opens the popup at the given location with content defined either explicitly with content or driven from the PopupTemplate of input features. This method sets the popup's visible property to true. Users can alternatively open the popup by directly setting the visible property to true.

A Popup instance is created and assigned to popup the first time openPopup() is called, unless popup is null. The popup then processes the click event.

When calling this method, to prevent the popup from opening when clicking on the view, set popupEnabled to false to stop event propagation on the view.

The popup will only display if the view's size constraints in dockOptions are met or the location property is set to a geometry.

Parameters

Specification

options Object

optional

Defines the location and content of the popup when opened.

Specification

title String

optional

Sets the title of the popup.

content String|HTMLElement|Widget

optional

Sets the content of the popup.

location Point

optional

Sets the popup's location, which is the geometry used to position the popup.

fetchFeatures Boolean

optional

Default Value: false

When true, indicates the popup should fetch the content of this feature and display it. If no PopupTemplate exists, a default template is created for the layer if defaultPopupTemplateEnabled = true. In order for this option to work, there must be a valid view and location set.

features Graphic []

optional

Sets the popup's features, which populate the title and content of the popup based on each graphic's PopupTemplate.

promises Promise[]

optional

Sets pending promises on the popup. The popup will display once the promises resolve. Each promise must resolve to an array of Graphics.

featureMenuOpen Boolean

optional

Default Value: false

This property enables multiple features in a popup to display in a list rather than displaying the first selected feature. Setting this to true allows the user to scroll through the list of features returned from the query and choose the selection they want to display within the popup.

updateLocationEnabled Boolean

optional

Default Value: false

When true, indicates the popup should update its location for each paginated feature based on the selectedFeature's geometry.

collapsed Boolean

optional

Default Value: false

When true, indicates that only the popup header will display.

shouldFocus Boolean

optional

Default Value: false

When true, indicates that the focus should be on the popup after it has been opened.

Returns

Type	Description
Promise	Resolves when the popup is opened. Calling `openPopup()` or `closePopup()` again rejects the Promise.

See also

Examples

// Opens a popup manually depending on where the user clicks with specified title and content.
view.on("click", (event)=>{
  view.openPopup({
   location: event.mapPoint,
   title: "You clicked here",
   content: "This is a point of interest"
  });
});

// Opens popup at the location of the click event and displays
// content for the selected features if a popupTemplate is defined.
 view.on("click", (event)=>{
   view.openPopup({
     location: event.mapPoint,
     fetchFeatures: true
   });
 });

// Opens popup with the properties specified at the location of the click event
// and updates the popup location based on the selected feature's geometry.
view.openPopup({
  title: "You clicked here",
  content: "This is a point of interest",
  location: event.mapPoint,
  updateLocationEnabled: true
});

// Opens popup with the specified array of graphics and displays the
// features in a list (feature menu) at the location of the first graphic in the array.
view.openPopup({
  features: graphics,
  featureMenuOpen: true,
  location: graphics[0].geometry
});

removeHandles Inherited Method removeHandles(groupKey) Inherited from Accessor

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");

toMap Inherited Method toMap(screenPoint){Point} Inherited from View2D

Converts the given screen point to a map point. The screen point represents a point in terms of pixels relative to the top-left corner of the view.

Parameter

screenPoint ScreenPoint|MouseEvent

The location on the screen (or native mouse event) to convert.

Returns

Type	Description
Point	The map point corresponding to the given screen point.

toScreen Inherited Method toScreen(point, options){ScreenPoint} Inherited from View2D

Converts the given map point to a screen point. The screen point represents a point in terms of pixels relative to the top-left corner of the view.

Parameters

point Point

A point geometry.

options ToScreenOptions2D

optional

Options for controlling the toScreen() calculation. See the properties defined in ToScreenOptions2D for object specifications.

Returns

Type	Description
ScreenPoint	The screen point corresponding to the given map point.

Example

// get the screen point for the specified map point.
const mapPoint = {
  x: -49.97,
  y: 41.73,
  spatialReference:{
     wkid: 4326
  }
};
const screenPoint = mapView.toScreen(mapPoint);

tryFatalErrorRecovery Inherited Method tryFatalErrorRecovery() Inherited from View

Call this method to clear any fatal errors resulting from a lost WebGL context.

See also

fatalError

Example

reactiveUtils.when(
  () => view.fatalError,
  () => view.tryFatalErrorRecovery()
);

when Inherited Method when(callback, errback){Promise} Inherited from View

when() may be leveraged once an instance of the class is created. This method takes two input parameters: a callback function and an errback function. The callback executes when the instance of the class loads. The errback executes if the instance of the class fails to load.

Parameters

callback Function

optional

The function to call when the promise resolves.

errback Function

optional

The function to execute when the promise fails.

Returns

Type	Description
Promise	Returns a new promise for the result of `callback` that may be used to chain additional functions.

Example

// Although this example uses MapView, any class instance that is a promise may use when() in the same way
let view = new MapView();
view.when(function(){
  // This function will execute once the promise is resolved
}, function(error){
  // This function will execute if the promise is rejected due to an error
});

whenLayerView Inherited Method whenLayerView(layer){Promise<LayerView>} Inherited from View

Gets the LayerView created on the view for the given layer. The returned promise resolves when the layer view for the given layer has been created, or rejects with an error (for example if the layer is not part of the view, or if the layer type is not supported in this view).

Parameter

layer Layer

The layer for which to obtain its LayerView.

Returns

Type	Description
Promise<LayerView>	Resolves to an instance of LayerView for the specified layer.

See also

Sample - StreamLayer

Example

// Create a feature layer from a url pointing to a Feature Service
let layer = new FeatureLayer(url);

map.add(layer);

view.whenLayerView(layer)
    .then(function(layerView) {
      // The layerview for the layer
    })
    .catch(function(error) {
      // An error occurred during the layerview creation
    });

Event Overview

Show inherited events

Hide inherited events

Type	Summary	Class
{target: View,native: Object}	Fires when browser focus is moved away from the view.	View
{mapPoint: Point,x: Number,y: Number,button: Number,buttons: 0\|1\|2,type: "click",stopPropagation: Function,timestamp: Number,native: Object}	Fires after a user clicks on the view.	View
{mapPoint: Point,x: Number,y: Number,button: Number,buttons: 0\|1\|2,type: "double-click",stopPropagation: Function,timestamp: Number,native: Object}	Fires after double-clicking on the view.	View
{action: "start"\|"added"\|"update"\|"removed"\|"end",x: Number,y: Number,origin: Object,origin.x: Number,origin.y: Number,button: 0\|1\|2,buttons: Number,type: "drag",radius: Number,angle: Number,stopPropagation: Function,timestamp: Number,native: Object}	Fires during a pointer drag on the view.	View
{target: View,native: Object}	Fires when browser focus is on the view.	View
{mapPoint: Point,x: Number,y: Number,button: 0\|1\|2,buttons: Number,type: "hold",stopPropagation: Function,timestamp: Number,native: Object}	Fires after holding either a mouse button or a single finger on the view for a short amount of time.	View
{mapPoint: Point,x: Number,y: Number,button: 0\|1\|2,buttons: Number,type: "immediate-click",stopPropagation: Function,timestamp: Number,native: Object}	Fires right after a user clicks on the view.	View
{mapPoint: Point,x: Number,y: Number,button: 0\|1\|2,buttons: Number,type: "immediate-double-click",stopPropagation: Function,timestamp: Number,native: Object}	Is emitted after two consecutive immediate-click events.	View
{repeat: Boolean,key: String,type: "key-down",stopPropagation: Function,timestamp: Number,native: Object}	Fires after a keyboard key is pressed.	View
{type: "key-up",key: String,stopPropagation: Function,timestamp: Number,native: Object}	Fires after a keyboard key is released.	View
{layer: Layer,layerView: LayerView}	Fires after each layer in the map has a corresponding LayerView created and rendered in the view.	View
{layer: Layer,error: Error}	Fires when an error emits during the creation of a LayerView after a layer has been added to the map.	View
{layer: Layer,layerView: LayerView}	Fires after a LayerView is destroyed and is no longer rendered in the view.	View
{x: Number,y: Number,deltaY: Number,type: "mouse-wheel",stopPropagation: Function,timestamp: Number,native: Object}	Fires when a wheel button of a pointing device (typically a mouse) is scrolled on the view.	View
{pointerId: Number,pointerType: "mouse"\|"touch",x: Number,y: Number,button: Number,buttons: Number,type: "pointer-down",stopPropagation: Function,timestamp: Number,native: Object}	Fires after a mouse button is pressed, or a finger touches the display.	View
{pointerId: Number,pointerType: "mouse"\|"touch",x: Number,y: Number,button: Number,buttons: Number,type: "pointer-enter",stopPropagation: Function,timestamp: Number,native: Object}	Fires after a mouse cursor enters the view, or a display touch begins.	View
{pointerId: Number,pointerType: "mouse"\|"touch",x: Number,y: Number,button: Number,buttons: Number,type: "pointer-leave",stopPropagation: Function,timestamp: Number,native: Object}	Fires after a mouse cursor leaves the view, or a display touch ends.	View
{pointerId: Number,pointerType: "mouse"\|"touch",x: Number,y: Number,button: Number,buttons: Number,type: "pointer-move",stopPropagation: Function,timestamp: Number,native: Object}	Fires after the mouse or a finger on the display moves.	View
{pointerId: Number,pointerType: "mouse"\|"touch",x: Number,y: Number,button: Number,buttons: Number,type: "pointer-up",stopPropagation: Function,timestamp: Number,native: Object}	Fires after a mouse button is released, or a display touch ends.	View
{oldWidth: Number,oldHeight: Number,width: Number,height: Number}	Fires when the view's size changes.	View

Event Details

blur Inherited Event blur Inherited from View

Fires when browser focus is moved away from the view.

Properties: target View

The view that the browser focus is moved away from.

native Object

A standard DOM KeyboardEvent.

click Inherited Event click Inherited from View

Fires after a user clicks on the view. This event emits slightly slower than an immediate-click event to make sure that a double-click event isn't triggered instead. The immediate-click event can be used for responding to a click event without delay.

Properties

mapPoint Point

The point location of the click on the view in the spatial reference of the map.

x Number

The horizontal screen coordinate of the click on the view.

y Number

The vertical screen coordinate of the click on the view.

button Number

Indicates which mouse button was clicked.

buttons Number

Indicates the current mouse button state.

Value	Description
0	left click (or touch)
1	middle click
2	right click

Possible Values:0|1|2

type String

The event type.

The value is always "click".

stopPropagation Function

Prevents the event bubbling up the event chain.

timestamp Number

Time stamp (in milliseconds) at which the event was emitted.

native Object

A standard DOM PointerEvent.

See also

Sample: Access features with click events

Examples

// Set up a click event handler and retrieve the screen point
view.on("click", function(event) {
 // the hitTest() checks to see if any graphics in the view
 // intersect the given screen x, y coordinates
 view.hitTest(event)
  .then(getGraphics);
});

view.on("click", function(event) {
 // you must overwrite default click-for-popup
 // behavior to display your own popup
 view.popupEnabled = false;

 // Get the coordinates of the click on the view
 let lat = Math.round(event.mapPoint.latitude * 1000) / 1000;
 let lon = Math.round(event.mapPoint.longitude * 1000) / 1000;

 view.popup.open({
   // Set the popup's title to the coordinates of the location
   title: "Reverse geocode: [" + lon + ", " + lat + "]",
   location: event.mapPoint // Set the location of the popup to the clicked location
   content: "This is a point of interest"  // content displayed in the popup
 });
});

double-click Inherited Event double-click Inherited from View

Fires after double-clicking on the view.

Properties: mapPoint Point

The point location of the click on the view in the spatial reference of the map.

x Number

The horizontal screen coordinate of the click on the view.

y Number

The vertical screen coordinate of the click on the view.

button Number

Indicates which mouse button was clicked.

buttons Number

Indicates the current mouse button state.

Value Description

0 left click (or touch)

1 middle click

2 right click

Possible Values:0|1|2

type String

The event type.

The value is always "double-click".

stopPropagation Function

Prevents the event bubbling up the event chain.

timestamp Number

Time stamp (in milliseconds) at which the event was emitted.

native Object

A standard DOM PointerEvent.

Example

view.on("double-click", function(event) {
  // The event object contains the mapPoint and the screen coordinates of the location
  // that was clicked.
  console.log("screen point", event.x, event.y);
  console.log("map point", event.mapPoint);
});

drag Inherited Event drag Inherited from View

Fires during a pointer drag on the view.

Properties

action String

Indicates the state of the drag. The two values added and removed indicate a change in the number of pointers involved.

Possible Values:"start"|"added"|"update"|"removed"|"end"

x Number

The horizontal screen coordinate of the pointer on the view.

y Number

The vertical screen coordinate of the pointer on the view.

origin Object

Screen coordinates of the start of the drag.

Specification: x Number

The horizontal screen coordinate of the pointer on the view.

y Number

The vertical screen coordinate of the pointer on the view.

button Number

Indicates which mouse button was clicked at the start of the drag. See MouseEvent.button.

Value	Description
0	left mouse button (or touch)
1	middle mouse button
2	right mouse button

Possible Values:0|1|2

buttons Number

Indicates which mouse buttons are pressed when the event is triggered. See MouseEvent.buttons.

type String

The event type.

The value is always "drag".

radius Number

The radius of a sphere around the multiple pointers involved in this drag. Or 0 while only a single pointer is used.

angle Number

Amount of rotation (in degrees) since the last event of type start.

stopPropagation Function

Prevents the event bubbling up the event chain.

timestamp Number

Time stamp (in milliseconds) at which the event was emitted.

native Object

A standard DOM MouseEvent.

Example

view.on("drag", function(event){
 // Print out the current state of the
 // drag event.
 console.log("drag state", event.action);
});

focus Inherited Event focus Inherited from View

Fires when browser focus is on the view.

Properties: target View

The view that the browser focus is currently on.

native Object

A standard DOM KeyboardEvent.

hold Inherited Event hold Inherited from View

Fires after holding either a mouse button or a single finger on the view for a short amount of time.

Properties: mapPoint Point

The point location of the click on the view in the spatial reference of the map.

x Number

The horizontal screen coordinate of the hold on the view.

y Number

The vertical screen coordinate of the hold on the view.

button Number

Indicates which mouse button was held down. See MouseEvent.button.

Value Description

0 left mouse button (or touch)

1 middle mouse button

2 right mouse button

Possible Values:0|1|2

buttons Number

Indicates which mouse buttons are pressed when the event is triggered. See MouseEvent.buttons.

type String

The event type.

The value is always "hold".

stopPropagation Function

Prevents the event bubbling up the event chain.

timestamp Number

Time stamp (in milliseconds) at which the event was emitted.

native Object

A standard DOM PointerEvent.

Example

view.on("hold", function(event) {
  // The event object contains the mapPoint and the screen coordinates of the location
  // that was clicked.
  console.log("hold at screen point", event.x, event.y);
  console.log("hold at map point", event.mapPoint);
});

immediate-click Inherited Event immediate-click Inherited from View

Fires right after a user clicks on the view. In contrast to the click event, the immediate-click event is emitted as soon as the user clicks on the view, and is not inhibited by a double-click event. This event is useful for interactive experiences that require feedback without delay.

Properties: mapPoint Point

The point location of the click on the view in the spatial reference of the map.

x Number

The horizontal screen coordinate of the click on the view.

y Number

The vertical screen coordinate of the click on the view.

button Number

Indicates which mouse button was clicked. See MouseEvent.button.

Value Description

0 left click (or touch)

1 middle click

2 right click

Possible Values:0|1|2

buttons Number

Indicates which buttons are pressed when the event is triggered. See MouseEvent.buttons.

type String

The event type.

The value is always "immediate-click".

stopPropagation Function

Prevents the event bubbling up the event chain. Inhibits the associated click and double-click events.

timestamp Number

Time stamp (in milliseconds) at which the event was emitted.

native Object

A standard DOM PointerEvent.

Example

// Set up an immediate-click event handler and retrieve the screen point
view.on("immediate-click", function(event) {
 // the hitTest() checks to see if any graphics in the view
 // intersect the given screen x, y coordinates
 view.hitTest(event)
  .then(getGraphics);
});

immediate-double-click Inherited Event immediate-double-click Inherited from View

Is emitted after two consecutive immediate-click events. In contrast to double-click, an immediate-double-click cannot be prevented by use of stopPropagation on the immediate-click event and can therefore be used to react to double-clicking independently of usage of the immediate-click event.

Properties: mapPoint Point

The point location of the click on the view in the spatial reference of the map.

x Number

The horizontal screen coordinate of the click on the view.

y Number

The vertical screen coordinate of the click on the view.

button Number

Indicates which mouse button was clicked. See MouseEvent.button.

Value Description

0 left click (or touch)

1 middle click

2 right click

Possible Values:0|1|2

buttons Number

Indicates which buttons are pressed when the event is triggered. See MouseEvent.buttons.

type String

The event type.

The value is always "immediate-double-click".

stopPropagation Function

Prevents the event bubbling up the event chain.

timestamp Number

Time stamp (in milliseconds) at which the event was emitted.

native Object

A standard DOM PointerEvent.

key-down Inherited Event key-down Inherited from View

Fires after a keyboard key is pressed.

Properties: repeat Boolean

Indicates whether this is the first event emitted due to the key press, or a repeat.

key String

The key value that was pressed, according to the MDN full list of key values.

type String

The event type.

The value is always "key-down".

stopPropagation Function

Prevents the event bubbling up the event chain.

timestamp Number

Time stamp (in milliseconds) at which the event was emitted.

native Object

A standard DOM KeyboardEvent.

Example

// Zoom in when user clicks on "a" button
// Zoom out when user clicks on "s" button
view.on("key-down", function(event){
 console.log("key-down", event);

 if (event.key === "a"){
   let zm = view.zoom + 1;

   view.goTo({
     target: view.center,
     zoom: zm
   });
 }
 else if(event.key == "s"){
   let zm = view.zoom - 1;

   view.goTo({
     target: view.center,
     zoom: zm
   });
 }
});

key-up Inherited Event key-up Inherited from View

Fires after a keyboard key is released.

Properties: type String

The event type.

The value is always "key-up".

key String

The key value that was released, according to the MDN full list of key values.

stopPropagation Function

Prevents the event bubbling up the event chain.

timestamp Number

Time stamp (in milliseconds) at which the event was emitted.

native Object

A standard DOM KeyboardEvent.

layerview-create Inherited Event layerview-create Inherited from View

Fires after each layer in the map has a corresponding LayerView created and rendered in the view.

Properties

layer Layer

The layer in the map for which the layerView was created.

layerView LayerView

The LayerView rendered in the view representing the layer in layer.

See also

View.whenLayerView()

Example

// This function fires each time a layer view is created for a layer in
// the map of the view.
view.on("layerview-create", function(event) {
  // The event contains the layer and its layer view that has just been
  // created. Here we check for the creation of a layer view for a layer with
  // a specific id, and log the layer view
  if (event.layer.id === "satellite") {
    // The LayerView for the desired layer
    console.log(event.layerView);
  }
});

layerview-create-error Inherited Event layerview-create-error Inherited from View

Fires when an error emits during the creation of a LayerView after a layer has been added to the map.

Properties

layer Layer

The layer in the map for which the view emitting this event failed to create a layer view.

error Error

An error object describing why the layer view failed to create.

See also

View.whenLayerView()

Example

// This function fires each time an error occurs during the creation of a layerview
view.on("layerview-create-error", function(event) {
  console.error("LayerView failed to create for layer with the id: ", event.layer.id);
});

layerview-destroy Inherited Event layerview-destroy Inherited from View

Fires after a LayerView is destroyed and is no longer rendered in the view. This happens for example when a layer is removed from the map of the view.

Properties: layer Layer

The layer in the map for which the layerView was destroyed.

layerView LayerView

The LayerView that was destroyed in the view.

mouse-wheel Inherited Event mouse-wheel Inherited from View

Fires when a wheel button of a pointing device (typically a mouse) is scrolled on the view.

Properties: x Number

The horizontal screen coordinate of the click on the view.

y Number

The vertical screen coordinate of the click on the view.

deltaY Number

Number representing the vertical scroll amount.

type String

The event type.

The value is always "mouse-wheel".

stopPropagation Function

Prevents the event bubbling up the event chain.

timestamp Number

Time stamp (in milliseconds) at which the event was emitted.

native Object

A standard DOM WheelEvent.

Example

view.on("mouse-wheel", function(event){
 // deltaY value is positive when wheel is scrolled up
 // and it is negative when wheel is scrolled down.
 console.log(event.deltaY);
});

pointer-down Inherited Event pointer-down Inherited from View

Fires after a mouse button is pressed, or a finger touches the display.

Properties: pointerId Number

Uniquely identifies a pointer between multiple down, move, and up events. Ids might get reused after a pointer-up event.

pointerType String

Indicates the pointer type.

Possible Values:"mouse"|"touch"

x Number

The horizontal screen coordinate of the pointer on the view.

y Number

The vertical screen coordinate of the pointer on the view.

button Number

Indicates which mouse button was clicked.

buttons Number

Indicates which mouse buttons are pressed when the event is triggered. See MouseEvent.buttons.

type String

The event type.

The value is always "pointer-down".

stopPropagation Function

Prevents the event bubbling up the event chain.

timestamp Number

Time stamp (in milliseconds) at which the event was emitted.

native Object

A standard DOM PointerEvent.

pointer-enter Inherited Event pointer-enter Inherited from View

Fires after a mouse cursor enters the view, or a display touch begins.

Properties: pointerId Number

Uniquely identifies a pointer between multiple events. Ids might get reused after a pointer-up event.

pointerType String

Indicates the pointer type.

Possible Values:"mouse"|"touch"

x Number

The horizontal screen coordinate of the pointer on the view.

y Number

The vertical screen coordinate of the pointer on the view.

button Number

Indicates which mouse button was clicked.

buttons Number

Indicates which mouse buttons are pressed when the event is triggered. See MouseEvent.buttons.

type String

The event type.

The value is always "pointer-enter".

stopPropagation Function

Prevents the event bubbling up the event chain.

timestamp Number

Time stamp (in milliseconds) at which the event was created.

native Object

A standard DOM PointerEvent.

pointer-leave Inherited Event pointer-leave Inherited from View

Fires after a mouse cursor leaves the view, or a display touch ends.

Properties: pointerId Number

Uniquely identifies a pointer between multiple events. Ids might get reused after a pointer-up event.

pointerType String

Indicates the pointer type.

Possible Values:"mouse"|"touch"

x Number

The horizontal screen coordinate of the pointer on the view.

y Number

The vertical screen coordinate of the pointer on the view.

button Number

Indicates which mouse button was clicked.

buttons Number

Indicates which mouse buttons are pressed when the event is triggered. See MouseEvent.buttons.

type String

The event type.

The value is always "pointer-leave".

stopPropagation Function

Prevents the event bubbling up the event chain.

timestamp Number

Time stamp (in milliseconds) at which the event was created.

native Object

A standard DOM PointerEvent.

pointer-move Inherited Event pointer-move Inherited from View

Fires after the mouse or a finger on the display moves.

Properties: pointerId Number

Uniquely identifies a pointer between multiple down, move, and up events. Ids might get reused after a pointer-up event.

pointerType String

Indicates the pointer type.

Possible Values:"mouse"|"touch"

x Number

The horizontal screen coordinate of the pointer on the view.

y Number

The vertical screen coordinate of the pointer on the view.

button Number

Indicates which mouse button was clicked.

buttons Number

Indicates which mouse buttons are pressed when the event is triggered. See MouseEvent.buttons.

type String

The event type.

The value is always "pointer-move".

stopPropagation Function

Prevents the event bubbling up the event chain.

timestamp Number

Time stamp (in milliseconds) at which the event was created.

native Object

A standard DOM PointerEvent.

Example

// Fires `pointer-move` event when user clicks on "Shift"
// key and moves the pointer on the view.
view.on('pointer-move', ["Shift"], function(event){
  let point = view.toMap({x: event.x, y: event.y});
  bufferPoint(point);
});

pointer-up Inherited Event pointer-up Inherited from View

Fires after a mouse button is released, or a display touch ends.

Properties: pointerId Number

Uniquely identifies a pointer between multiple down, move, and up events. Ids might get reused after a pointer-up event.

pointerType String

Indicates the pointer type.

Possible Values:"mouse"|"touch"

x Number

The horizontal screen coordinate of the pointer on the view.

y Number

The vertical screen coordinate of the pointer on the view.

button Number

Indicates which mouse button was clicked.

buttons Number

Indicates which mouse buttons are pressed when the event is triggered. See MouseEvent.buttons.

type String

The event type.

The value is always "pointer-up".

stopPropagation Function

Prevents the event bubbling up the event chain. Inhibits the associated immediate-click, click and double-click events.

timestamp Number

Time stamp (in milliseconds) at which the event was created.

native Object

A standard DOM PointerEvent.

resize Inherited Event resize Inherited from View

Fires when the view's size changes.

Properties

oldWidth Number

The previous view width in pixels

oldHeight Number

The previous view height in pixels

width Number

The new measured view width in pixels

height Number

The new measured view height in pixels

See also