OpenLayers

Class: Group

ol.layer.Group

A ol.Collection of layers that are handled together.

A generic change event is triggered when the group/Collection changes.

new ol.layer.Group(opt_options)

src/ol/layer/group.js, line 28
Name Type Description
options

Layer options.

Name Type Description
opacity number | undefined

Opacity (0, 1). Default is 1.
visible boolean | undefined

Visibility. Default is true.
extent ol.Extent | undefined

The bounding extent for layer rendering. The layer will not be rendered outside of this extent.
zIndex number | undefined

The z-index for layer rendering. At rendering time, the layers will be ordered, first by Z-index and then by position. The default Z-index is 0.
minResolution number | undefined

The minimum resolution (inclusive) at which this layer will be visible.
maxResolution number | undefined

The maximum resolution (exclusive) below which this layer will be visible.
layers Array.<ol.layer.Base> | ol.Collection.<ol.layer.Base> | undefined

Child layers.
Fires:

Extends

Observable Properties

Name Type Settable ol.Object.Event type Description
extent ol.Extent | undefined yes change:extent

The layer extent.
layers ol.Collection.<ol.layer.Base> yes change:layers

Collection of layers that are part of this group.
maxResolution number yes change:maxresolution

The maximum resolution of the layer.
minResolution number yes change:minresolution

The minimum resolution of the layer.
opacity number yes change:opacity

The opacity of the layer.
visible boolean yes change:visible

The visibility of the layer.
zIndex number yes change:zindex

The Z-index of the layer.

Methods

changed() inherited

src/ol/observable.js, line 58

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

dispatchEvent(event) inherited

src/ol/observable.js, line 75

Dispatches an event and calls all listeners listening for events of this type. The event parameter can either be a string or an Object with a type property.

Name Type Description
event Object | ol.events.Event | string

Event object.

get(key){*} inherited

src/ol/object.js, line 101

Gets a value.

Name Type Description
key string

Key name.
Returns:
Value.

getExtent(){ol.Extent|undefined} inherited

src/ol/layer/base.js, line 108

Return the extent of the layer or undefined if it will be visible regardless of extent.

Returns:
The layer extent.

getKeys(){Array.<string>} inherited

src/ol/object.js, line 115

Get a list of object property names.

Returns:
List of property names.

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

src/ol/layer/group.js, line 163

Returns the collection of layers in this group.

Returns:
Collection of layers that are part of this group.

getMaxResolution(){number} inherited

src/ol/layer/base.js, line 120

Return the maximum resolution of the layer.

Returns:
The maximum resolution of the layer.

getMinResolution(){number} inherited

src/ol/layer/base.js, line 132

Return the minimum resolution of the layer.

Returns:
The minimum resolution of the layer.

getOpacity(){number} inherited

src/ol/layer/base.js, line 144

Return the opacity of the layer (between 0 and 1).

Returns:
The opacity of the layer.

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

src/ol/object.js, line 125

Get an object of all property names and values.

Returns:
Object.

getRevision(){number} inherited

src/ol/observable.js, line 84

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

Returns:
Revision.

getVisible(){boolean} inherited

src/ol/layer/base.js, line 162

Return the visibility of the layer (true or false).

Returns:
The visibility of the layer.

getZIndex(){number} inherited

src/ol/layer/base.js, line 174

Return the Z-index of the layer, which is used to order layers before rendering. The default Z-index is 0.

Returns:
The Z-index of the layer.

on(type, listener, opt_this){ol.EventsKey|Array.<ol.EventsKey>} inherited

src/ol/observable.js, line 99

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. If called with an array of event types as the first argument, the return will be an array of keys.

once(type, listener, opt_this){ol.EventsKey|Array.<ol.EventsKey>} inherited

src/ol/observable.js, line 124

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. If called with an array of event types as the first argument, the return will be an array of keys.

set(key, value, opt_silent) inherited

src/ol/object.js, line 150

Sets a value.

Name Type Description
key string

Key name.
value *

Value.
silent boolean

Update without triggering an event.

setExtent(extent) inherited

src/ol/layer/base.js, line 186

Set the extent at which the layer is visible. If undefined, the layer will be visible at all extents.

Name Type Description
extent ol.Extent | undefined

The extent of the layer.

setLayers(layers)

src/ol/layer/group.js, line 177

Set the collection of layers in this group.

Name Type Description
layers ol.Collection.<ol.layer.Base>

Collection of layers that are part of this group.

setMaxResolution(maxResolution) inherited

src/ol/layer/base.js, line 197

Set the maximum resolution at which the layer is visible.

Name Type Description
maxResolution number

The maximum resolution of the layer.

setMinResolution(minResolution) inherited

src/ol/layer/base.js, line 208

Set the minimum resolution at which the layer is visible.

Name Type Description
minResolution number

The minimum resolution of the layer.

setOpacity(opacity) inherited

src/ol/layer/base.js, line 219

Set the opacity of the layer, allowed values range from 0 to 1.

Name Type Description
opacity number

The opacity of the layer.

setProperties(values, opt_silent) inherited

src/ol/object.js, line 170

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.
silent boolean

Update without triggering an event.

setVisible(visible) inherited

src/ol/layer/base.js, line 230

Set the visibility of the layer (true or false).

Name Type Description
visible boolean

The visibility of the layer.

setZIndex(zindex) inherited

src/ol/layer/base.js, line 242

Set Z-index of the layer, which is used to order layers before rendering. The default Z-index is 0.

Name Type Description
zindex number

The z-index of the layer.

un(type, listener, opt_this) inherited

src/ol/observable.js, line 147

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.

unset(key, opt_silent) inherited

src/ol/object.js, line 184

Unsets a property.

Name Type Description
key string

Key name.
silent boolean

Unset without triggering an event.