Class: ScaleLine

Extends

• ol.control.Control

Observable Properties

Name	Type	Settable	ol.ObjectEvent type	Description
units	ol.control.ScaleLineUnits | undefined	yes	change:units	The units to use in the scale line.

Methods

ol.control.ScaleLine.render(mapEvent) experimental

src/ol/control/scalelinecontrol.js, line 163

This:

• {ol.control.ScaleLine}

Name	Type	Description
mapEvent	ol.MapEvent	Map event.

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

src/ol/object.js, line 326

The bindTo method allows you to set up a two-way binding between a source and target object. The method returns an object with a transform method that you can use to provide from and to functions to 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	Target key.

changed() inherited experimental

src/ol/observable.js, line 52

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

Fires:

• change experimental

get(key){*} inherited experimental

src/ol/object.js, line 354

Gets a value.

Name	Type	Description
key	string	Key name.

Returns:

Value.

getKeys(){Array.<string>} inherited experimental

src/ol/object.js, line 373

Get a list of object property names.

Returns:

List of property names.

getMap(){ol.Map} inherited

src/ol/control/control.js, line 95

Get the map associated with this control.

Returns:

Map.

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

src/ol/object.js, line 405

Get an object of all property names and values.

Returns:

Object.

getRevision(){number} inherited experimental

src/ol/observable.js, line 62

Returns:

Revision.

getUnits(){ol.control.ScaleLineUnits|undefined}

src/ol/control/scalelinecontrol.js, line 148

Returns:

The units to use in the scale line.

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

src/ol/observable.js, line 75

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 88

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.

set(key, value) inherited experimental

src/ol/object.js, line 437

Sets a value.

Name	Type	Description
key	string	Key name.
value	*	Value.

setMap(map) inherited

src/ol/control/control.js, line 107

Remove the control from its current map and attach it to the new map. Subclasses may set up event handlers to get notified about changes to the map here.

Name	Type	Description
map	ol.Map	Map.

setProperties(values) inherited experimental

src/ol/object.js, line 456

Sets a collection of key-value pairs.

Name	Type	Description
values	Object.<string, *>	Values.

setTarget(target) inherited experimental

src/ol/control/control.js, line 138

This function is used to set a target element for the control. It has no effect if it is called after the control has been added to the map (i.e. after setMap is called on the control). If no target is set in the options passed to the control constructor and if setTarget is not called then the control is added to the map's overlay container.

Name	Type	Description
target	Element | string	Target.

setUnits(units)

src/ol/control/scalelinecontrol.js, line 187

Name	Type	Description
units	ol.control.ScaleLineUnits	The units to use in the scale line.

un(type, listener, opt_this) inherited

src/ol/observable.js, line 101

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.

unbind(key) inherited experimental

src/ol/object.js, line 470

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() inherited experimental

src/ol/object.js, line 487

Removes all bindings.

unByKey(key) inherited

src/ol/observable.js, line 114

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().