OpenLayers 3 API Documentation

Class: KeyboardZoom

ol.interaction.KeyboardZoom

Allows the user to zoom the map using keyboard + and -. Note that, although this interaction is by default included in maps, the keys can only be used when browser focus is on the element to which the keyboard events are attached. By default, this is the map div, though you can change this with the keyboardEventTarget in ol.Map. document never loses focus but, for any other element, focus will have to be on, and returned to, this element if the keys are to function. See also ol.interaction.KeyboardPan.

new ol.interaction.KeyboardZoom(opt_options)

src/ol/interaction/keyboardzoominteraction.js, line 28
Name Type Description
options

Options.

Name Type Description
duration number | undefined experimental

Animation duration in milliseconds. Default is 100.
condition ol.events.ConditionType | undefined experimental

A function that takes an ol.MapBrowserEvent and returns a boolean to indicate whether that event should be handled. Default is ol.events.condition.targetNotEditable.
delta number | undefined experimental

The amount to zoom on each key press. Default is 1.

Extends

Methods

dispatchChangeEvent() inherited experimental

src/ol/observable.js, line 42

Dispatches a change event.

Fires:
  • change experimental

getRevision(){number} inherited experimental

src/ol/observable.js, line 52
Returns:
Revision.

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

src/ol/observable.js, line 65

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 78

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.

un(type, listener, opt_this) inherited

src/ol/observable.js, line 91

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 101

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

Name Type Description
key goog.events.Key

Key.