OpenLayers 3

ol.interaction. ol.interaction.KeyboardZoom

new KeyboardZoom

Stability: experimental

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 keyboardTargetElement 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.

Parameters:
Name Type Argument Description
options olx.interaction.KeyboardZoomOptions <optional>

Options.
Source:
  • keyboardzoominteraction.js, line 28

Extends

Methods

dispatchChangeEvent

Stability: experimental

Dispatches a change event. Register a listener for this event to get notified of changes.

Inherited From:
Source:
  • observable.js, line 39
Fires:
  • event:change

on

Stability: experimental

Listen for a certain type of event.

Parameters:
Name Type Argument 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.
Inherited From:
Source:
  • observable.js, line 62
Returns:

Unique key for the listener.

Type
goog.events.Key

once

Stability: experimental

Listen once for a certain type of event.

Parameters:
Name Type Argument 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.
Inherited From:
Source:
  • observable.js, line 75
Returns:

Unique key for the listener.

Type
goog.events.Key

un

Stability: experimental

Unlisten for a certain type of event.

Parameters:
Name Type Argument 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.
Inherited From:
Source:
  • observable.js, line 87

unByKey

Stability: experimental

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

Parameters:
Name Type Description
key goog.events.Key

Key.
Inherited From:
Source:
  • observable.js, line 97