OpenLayers 3 API Documentation

Class: Object

ol.Object

Abstract base class from which all non-trivial classes inherit.

It provides standardised get/set methods, and implements a form of Key Value Observing. Setting a value triggers a change event, and 2 objects can be bound together such that a change in one will automatically be reflected in the other.

See ol.dom.Input for specific case of binding an object with an HTML element.

new ol.Object(opt_values) experimental

src/ol/object.js, line 124
Name Type Description
values Object.<string, *> optional

Values.
Fires:

Subclasses

Extends

Methods

bindTo(key, target, opt_targetKey){ol.ObjectAccessor} experimental

src/ol/object.js, line 257

The bindTo method allows you to set up a two-way binding between a source and target object. The method returns an ol.ObjectAccessor with a transform method that lets you transform values on the way from the source to the target and on the way back.

For example, if you had two map views (sourceView and targetView) and you wanted the target view to have double the resolution of the source view, you could transform the resolution on the way to and from the target with the following:

sourceView.bindTo('resolution', targetView)
  .transform(
    function(sourceResolution) {
      // from sourceView.resolution to targetView.resolution
      return 2 * sourceResolution;
    },
    function(targetResolution) {
      // from targetView.resolution to sourceView.resolution
      return targetResolution / 2;
    }
  );
Name Type Description
key string

Key name.
target ol.Object

Target.
targetKey string optional

Target key.

dispatchChangeEvent() inherited experimental

src/ol/observable.js, line 41

Dispatches a change event.

Fires:
  • change experimental

get(key){*} experimental

src/ol/object.js, line 314

Gets a value.

Name Type Description
key string

Key name.
Returns:
Value.

getKeys(){Array.<string>} experimental

src/ol/object.js, line 342

Get a list of object property names.

Returns:
List of property names.

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

src/ol/object.js, line 374

Get an object of all property names and values.

Returns:
Object.

notify(key) experimental

src/ol/object.js, line 394

Notify all observers of a change on this property. This notifies both objects that are bound to the object's property as well as the object that it is bound to.

Name Type Description
key string

Key name.

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

src/ol/observable.js, line 63

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 optional

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

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

src/ol/observable.js, line 76

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 optional

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

set(key, value) experimental

src/ol/object.js, line 425

Sets a value.

Name Type Description
key string

Key name.
value *

Value.

setValues(values) experimental

src/ol/object.js, line 454

Sets a collection of key-value pairs.

Name Type Description
values Object.<string, *>

Values.

un(type, listener, opt_this) inherited experimental

src/ol/observable.js, line 88

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 optional

The object to use as this in listener.

unbind(key) experimental

src/ol/object.js, line 468

Removes a binding. Unbinding will set the unbound property to the current value. The object will not be notified, as the value has not changed.

Name Type Description
key string

Key name.

unbindAll() experimental

src/ol/object.js, line 492

Removes all bindings.

unByKey(key) inherited experimental

src/ol/observable.js, line 98

Removes an event listener using the key returned by on() or once().

Name Type Description
key goog.events.Key

Key.