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) experimental

src/ol/interaction/keyboardzoominteraction.js, line 30
Name Type Description
options optional

Options.

Name Type Description
duration number | undefined optional

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

A conditional modifier (i.e. Shift key) that determines if the interaction is active or not, default is no modifiers.
delta number | undefined optional

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

Extends

Methods

dispatchChangeEvent() inherited experimental

src/ol/observable.js, line 41

Dispatches a change event.

Fires:
  • change experimental

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.

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.

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.