OpenLayers 3

Class: Map

ol.Map

The map is the core component of OpenLayers. For a map to render, a view, one or more layers, and a target container are needed:

var map = new ol.Map({
  view: new ol.View({
    center: [0, 0],
    zoom: 1
  }),
  layers: [
    new ol.layer.Tile({
      source: new ol.source.MapQuest({layer: 'osm'})
    })
  ],
  target: 'map'
});

The above snippet creates a map using a ol.layer.Tile to display ol.source.MapQuest OSM data and render it to a DOM element with the id map.

The constructor places a viewport container (with CSS class name ol-viewport) in the target element (see getViewport()), and then two further elements within the viewport: one with CSS class name ol-overlaycontainer-stopevent for controls and some overlays, and one with CSS class name ol-overlaycontainer for other overlays (see the stopEvent option of ol.Overlay for the difference). The map itself is placed in a further element within the viewport, either DOM or Canvas, depending on the renderer.

Layers are stored as a ol.Collection in layerGroups. A top-level group is provided by the library. This is what is accessed by getLayerGroup and setLayerGroup. Layers entered in the options are added to this group, and addLayer and removeLayer change the layer collection in the group. getLayers is a convenience function for getLayerGroup().getLayers(). Note that ol.layer.Group is a subclass of ol.layer.Base, so layers entered in the options or added with addLayer can be groups, which can contain further groups, and so on.

new ol.Map(options)

src/ol/map.js, line 174
Name Type Description
options

Map options.

Name Type Description
controls ol.Collection.<ol.control.Control> | Array.<ol.control.Control> | undefined

Controls initially added to the map. If not specified, ol.control.defaults() is used.
pixelRatio number | undefined experimental

The ratio between physical pixels and device-independent pixels (dips) on the device. If undefined then it gets set by using window.devicePixelRatio.
interactions ol.Collection.<ol.interaction.Interaction> | Array.<ol.interaction.Interaction> | undefined

Interactions that are initially added to the map. If not specified, ol.interaction.defaults() is used.
keyboardEventTarget Element | Document | string | undefined experimental

The element to listen to keyboard events on. This determines when the KeyboardPan and KeyboardZoom interactions trigger. For example, if this option is set to document the keyboard interactions will always trigger. If this option is not specified, the element the library listens to keyboard events on is the map target (i.e. the user-provided div for the map). If this is not document the target element needs to be focused for key events to be emitted, requiring that the target element has a tabindex attribute.
layers Array.<ol.layer.Base> | ol.Collection.<ol.layer.Base> | undefined

Layers. If this is not defined, a map with no layers will be rendered. Note that layers are rendered in the order supplied, so if you want, for example, a vector layer to appear on top of a tile layer, it must come after the tile layer.
loadTilesWhileAnimating boolean | undefined experimental

When set to true, tiles will be loaded during animations. This may improve the user experience, but can also make animations stutter on devices with slow memory. Default is false.
loadTilesWhileInteracting boolean | undefined experimental

When set to true, tiles will be loaded while interacting with the map. This may improve the user experience, but can also make map panning and zooming choppy on devices with slow memory. Default is false.
logo boolean | string | olx.LogoOptions | undefined

The map logo. A logo to be displayed on the map at all times. If a string is provided, it will be set as the image source of the logo. If an object is provided, the src property should be the URL for an image and the href property should be a URL for creating a link. To disable the map logo, set the option to false. By default, the OpenLayers 3 logo is shown.
overlays ol.Collection.<ol.Overlay> | Array.<ol.Overlay> | undefined

Overlays initially added to the map. By default, no overlays are added.
renderer ol.RendererType | Array.<(ol.RendererType|string)> | string | undefined

Renderer. By default, Canvas, DOM and WebGL renderers are tested for support in that order, and the first supported used. Specify a ol.RendererType here to use a specific renderer. Note that at present only the Canvas renderer supports vector data.
target Element | string | undefined

The container for the map, either the element itself or the id of the element. If not specified at construction time, ol.Map#setTarget must be called for the map to be rendered.
view ol.View | undefined

The map's view. No layer sources will be fetched unless this is specified at construction time or through ol.Map#setView.
Fires:

Extends

Observable Properties

Name Type Settable ol.ObjectEvent type Description
layerGroup ol.layer.Group yes change:layergroup

A layer group containing the layers in this map.
size ol.Size | undefined yes change:size

The size in pixels of the map in the DOM.
target Element | string | undefined yes change:target

The Element or id of the Element that the map is rendered in.
view ol.View yes change:view

The view that controls this map.

Methods

addControl(control)

src/ol/map.js, line 496

Add the given control to the map.

Name Type Description
control ol.control.Control

Control.

addInteraction(interaction)

src/ol/map.js, line 508

Add the given interaction to the map.

Name Type Description
interaction ol.interaction.Interaction

Interaction to add.

addLayer(layer)

src/ol/map.js, line 523

Adds the given layer to the top of this map. If you want to add a layer elsewhere in the stack, use getLayers() and the methods available on ol.Collection.

Name Type Description
layer ol.layer.Base

Layer.

addOverlay(overlay)

src/ol/map.js, line 534

Add the given overlay to the map.

Name Type Description
overlay ol.Overlay

Overlay.

beforeRender(var_args) experimental

src/ol/map.js, line 548

Add functions to be called before rendering. This can be used for attaching animations before updating the map's view. The ol.animation namespace provides several static methods for creating prerender functions.

Name Type Description
var_args ol.PreRenderFunction

Any number of pre-render functions.

changed() inherited experimental

src/ol/observable.js, line 51

Increases the revision counter and dispatches a 'change' event.

forEachFeatureAtPixel(pixel, callback, opt_this, opt_layerFilter, opt_this2){T|undefined}

src/ol/map.js, line 596

Detect features that intersect a pixel on the viewport, and execute a callback with each intersecting feature. Layers included in the detection can be configured through opt_layerFilter.

Name Type Description
pixel ol.Pixel

Pixel.
callback function

Feature callback. The callback will be called with two arguments. The first argument is one feature at the pixel, the second is the layer of the feature. To stop detection, callback functions can return a truthy value.
this S

Value to use as this when executing callback.
layerFilter function

Layer filter function. The filter function will receive one argument, the layer-candidate and it should return a boolean value. Only layers which are visible and for which this function returns true will be tested for features. By default, all visible layers will be tested.
this2 U

Value to use as this when executing layerFilter.
Returns:
Callback result, i.e. the return value of last callback execution, or the first truthy callback return value.

forEachLayerAtPixel(pixel, callback, opt_this, opt_layerFilter, opt_this2){T|undefined}

src/ol/map.js, line 634

Detect layers that have a color value at a pixel on the viewport, and execute a callback with each matching layer. Layers included in the detection can be configured through opt_layerFilter.

Name Type Description
pixel ol.Pixel

Pixel.
callback function

Layer callback. Will receive one argument, the layer that contains the color pixel. To stop detection, callback functions can return a truthy value.
this S

Value to use as this when executing callback.
layerFilter function

Layer filter function. The filter function will receive one argument, the layer-candidate and it should return a boolean value. Only layers which are visible and for which this function returns true will be tested for features. By default, all visible layers will be tested.
this2 U

Value to use as this when executing layerFilter.
Returns:
Callback result, i.e. the return value of last callback execution, or the first truthy callback return value.

get(key){*} inherited

src/ol/object.js, line 150

Gets a value.

Name Type Description
key string

Key name.
Returns:
Value.

getControls(){ol.Collection.<ol.control.Control>}

src/ol/map.js, line 753

Get the map controls. Modifying this collection changes the controls associated with the map.

Returns:
Controls.

getCoordinateFromPixel(pixel){ol.Coordinate}

src/ol/map.js, line 736

Get the coordinate for a given pixel. This returns a coordinate in the map view projection.

Name Type Description
pixel ol.Pixel

Pixel position in the map viewport.
Returns:
The coordinate for the pixel position.

getEventCoordinate(event){ol.Coordinate}

src/ol/map.js, line 684

Returns the geographical coordinate for a browser event.

Name Type Description
event Event

Event.
Returns:
Coordinate.

getEventPixel(event){ol.Pixel}

src/ol/map.js, line 695

Returns the map pixel position for a browser event relative to the viewport.

Name Type Description
event Event

Event.
Returns:
Pixel.

getInteractions(){ol.Collection.<ol.interaction.Interaction>}

src/ol/map.js, line 777

Get the map interactions. Modifying this collection changes the interactions associated with the map.

Interactions are used for e.g. pan, zoom and rotate.

Returns:
Interactions.

getKeys(){Array.<string>} inherited

src/ol/object.js, line 164

Get a list of object property names.

Returns:
List of property names.

getLayerGroup(){ol.layer.Group}

src/ol/map.js, line 788

Get the layergroup associated with this map.

Returns:
A layer group containing the layers in this map.

getLayers(){ol.Collection.<ol.layer.Base>}

src/ol/map.js, line 798

Get the collection of layers associated with this map.

Returns:
Layers.

getOverlays(){ol.Collection.<ol.Overlay>}

src/ol/map.js, line 764

Get the map overlays. Modifying this collection changes the overlays associated with the map.

Returns:
Overlays.

getPixelFromCoordinate(coordinate){ol.Pixel}

src/ol/map.js, line 811

Get the pixel for a coordinate. This takes a coordinate in the map view projection and returns the corresponding pixel.

Name Type Description
coordinate ol.Coordinate

A map coordinate.
Returns:
A pixel position in the map viewport.

getProperties(){Object.<string, *>} inherited

src/ol/object.js, line 174

Get an object of all property names and values.

Returns:
Object.

getRevision(){number} inherited experimental

src/ol/observable.js, line 70

Get the version number for this object. Each time the object is modified, its version number will be incremented.

Returns:
Revision.

getSize(){ol.Size|undefined}

src/ol/map.js, line 837

Get the size of this map.

Returns:
The size in pixels of the map in the DOM.

getTarget(){Element|string|undefined}

src/ol/map.js, line 710

Get the target in which this map is rendered. Note that this returns what is entered as an option or in setTarget: if that was an element, it returns an element; if a string, it returns that.

Returns:
The Element or id of the Element that the map is rendered in.

getTargetElement(){Element} experimental

src/ol/map.js, line 723

Get the DOM element into which this map is rendered. In contrast to getTarget this method always return an Element, or null if the map has no target.

Returns:
The element that the map is rendered in.

getView(){ol.View}

src/ol/map.js, line 849

Get the view associated with this map. A view manages properties such as center and resolution.

Returns:
The view that controls this map.

getViewport(){Element}

src/ol/map.js, line 859

Get the element that serves as the map viewport.

Returns:
Viewport.

hasFeatureAtPixel(pixel, opt_layerFilter, opt_this){boolean} experimental

src/ol/map.js, line 664

Detect if features intersect a pixel on the viewport. Layers included in the detection can be configured through opt_layerFilter.

Name Type Description
pixel ol.Pixel

Pixel.
layerFilter function

Layer filter function. The filter function will receive one argument, the layer-candidate and it should return a boolean value. Only layers which are visible and for which this function returns true will be tested for features. By default, all visible layers will be tested.
this U

Value to use as this when executing layerFilter.
Returns:
Is there a feature at the given pixel?

on(type, listener, opt_this){goog.events.Key} inherited

src/ol/observable.js, line 83

Listen for a certain type of event.

Name Type Description
type string | Array.<string>

The event type or array of event types.
listener function

The listener function.
this Object

The object to use as this in listener.
Returns:
Unique key for the listener.

once(type, listener, opt_this){goog.events.Key} inherited

src/ol/observable.js, line 96

Listen once for a certain type of event.

Name Type Description
type string | Array.<string>

The event type or array of event types.
listener function

The listener function.
this Object

The object to use as this in listener.
Returns:
Unique key for the listener.

removeControl(control){ol.control.Control|undefined}

src/ol/map.js, line 1201

Remove the given control from the map.

Name Type Description
control ol.control.Control

Control.
Returns:
The removed control (or undefined if the control was not found).

removeInteraction(interaction){ol.interaction.Interaction|undefined}

src/ol/map.js, line 1218

Remove the given interaction from the map.

Name Type Description
interaction ol.interaction.Interaction

Interaction to remove.
Returns:
The removed interaction (or undefined if the interaction was not found).

removeLayer(layer){ol.layer.Base|undefined}

src/ol/map.js, line 1237

Removes the given layer from the map.

Name Type Description
layer ol.layer.Base

Layer.
Returns:
The removed layer (or undefined if the layer was not found).

removeOverlay(overlay){ol.Overlay|undefined}

src/ol/map.js, line 1250

Remove the given overlay from the map.

Name Type Description
overlay ol.Overlay

Overlay.
Returns:
The removed overlay (or undefined if the overlay was not found).

render()

src/ol/map.js, line 1187

Request a map rendering (at the next animation frame).

renderSync()

src/ol/map.js, line 1178

Requests an immediate render in a synchronous manner.

set(key, value) inherited

src/ol/object.js, line 203

Sets a value.

Name Type Description
key string

Key name.
value *

Value.

setLayerGroup(layerGroup)

src/ol/map.js, line 1357

Sets the layergroup of this map.

Name Type Description
layerGroup ol.layer.Group

A layer group containing the layers in this map.

setProperties(values) inherited

src/ol/object.js, line 216

Sets a collection of key-value pairs. Note that this changes any existing properties and adds new ones (it does not remove any existing properties).

Name Type Description
values Object.<string, *>

Values.

setSize(size) experimental

src/ol/map.js, line 1368

Set the size of this map.

Name Type Description
size ol.Size | undefined

The size in pixels of the map in the DOM.

setTarget(target)

src/ol/map.js, line 1380

Set the target element to render this map into.

Name Type Description
target Element | string | undefined

The Element or id of the Element that the map is rendered in.

setView(view)

src/ol/map.js, line 1391

Set the view for this map.

Name Type Description
view ol.View

The view that controls this map.

un(type, listener, opt_this) inherited

src/ol/observable.js, line 109

Unlisten for a certain type of event.

Name Type Description
type string | Array.<string>

The event type or array of event types.
listener function

The listener function.
this Object

The object which was used as this by the listener.

unByKey(key) inherited

src/ol/observable.js, line 122

Removes an event listener using the key returned by on() or once(). Note that using the ol.Observable.unByKey static function is to be preferred.

Name Type Description
key goog.events.Key

The key returned by on() or once().

unset(key) inherited

src/ol/object.js, line 229

Unsets a property.

Name Type Description
key string

Key name.

updateSize()

src/ol/map.js, line 1411

Force a recalculation of the map viewport size. This should be called when third-party code changes the size of the map viewport.