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Event system | Maps JavaScript API

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google.maps.event class

Namespace for all public event functions

Access by calling const {event} = await google.maps.importLibrary("core").
See Libraries in the Maps JavaScript API.

addListener(instance, eventName, handler)

• instance:  Object
• eventName:  string
• handler:  Function

Adds the given listener function to the given event name for the given object instance. Returns an identifier for this listener that can be used with removeListener().

addListenerOnce(instance, eventName, handler)

• instance:  Object
• eventName:  string
• handler:  Function

Like addListener, but the handler removes itself after handling the first event.

clearInstanceListeners(instance)

• instance:  Object

Return Value:  void

Removes all listeners for all events for the given instance.

clearListeners(instance, eventName)

• instance:  Object
• eventName:  string

Return Value:  void

Removes all listeners for the given event for the given instance.

hasListeners(instance, eventName)

• instance:  Object
• eventName:  string

Return Value:  boolean

Returns if there are listeners for the given event on the given instance. Can be used to save the computation of expensive event details.

removeListener(listener)

• listener:  MapsEventListener

Return Value:  void

Removes the given listener, which should have been returned by addListener above. Equivalent to calling listener.remove().

trigger(instance, eventName, eventArgs)

• instance:  Object
• eventName:  string
• eventArgs:  ...?

Return Value:  void

Triggers the given event. All arguments after eventName are passed as arguments to the listeners.

Deprecated: google.maps.event.addDomListener() is deprecated, use the standard addEventListener() method instead. The feature will continue to work and there is no plan to decommission it.

addDomListener(instance, eventName, handler[, capture])

• instance:  Object
• eventName:  string
• handler:  Function
• capture:  boolean optional

Cross browser event handler registration. This listener is removed by calling removeListener(handle) for the handle that is returned by this function.

Deprecated: google.maps.event.addDomListenerOnce() is deprecated, use the standard addEventListener() method instead. The feature will continue to work and there is no plan to decommission it.

addDomListenerOnce(instance, eventName, handler[, capture])

• instance:  Object
• eventName:  string
• handler:  Function
• capture:  boolean optional

Wrapper around addDomListener that removes the listener after the first event.

google.maps.MapsEventListener interface

An event listener, created by google.maps.event.addListener() and friends.

remove()

Parameters:  None

Return Value:  void

Calling listener.remove() is equivalent to google.maps.event.removeListener(listener).

google.maps.MVCObject class

Base class implementing KVO.

The MVCObject constructor is guaranteed to be an empty function, and so you may inherit from MVCObject by writing MySubclass.prototype = new google.maps.MVCObject();. Unless otherwise noted, this is not true of other classes in the API, and inheriting from other classes in the API is not supported.

Access by calling const {MVCObject} = await google.maps.importLibrary("core").
See Libraries in the Maps JavaScript API.

MVCObject()

Parameters:  None

Creates an MVCObject.

addListener(eventName, handler)

• eventName:  string
• handler:  Function

Adds the given listener function to the given event name. Returns an identifier for this listener that can be used with google.maps.event.removeListener.

bindTo(key, target[, targetKey, noNotify])

• key:  string
• target:  MVCObject
• targetKey:  string optional
• noNotify:  boolean optional

Return Value:  None

Binds a View to a Model.

get(key)

• key:  string

Return Value:  ?

Gets a value.

notify(key)

• key:  string

Return Value:  None

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.

set(key, value)

• key:  string
• value:  *

Return Value:  None

Sets a value.

setValues([values])

• values:  Object optional

Return Value:  None

Sets a collection of key-value pairs.

unbind(key)

• key:  string

Return Value:  None

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.

unbindAll()

Parameters:  None

Return Value:  None

Removes all bindings.

google.maps.MVCArray<T> class

This class extends MVCObject.

Access by calling const {MVCArray} = await google.maps.importLibrary("core").
See Libraries in the Maps JavaScript API.

MVCArray([array])

• array:  Array<T> optional

A mutable MVC Array.

clear()

Parameters:  None

Return Value:  None

Removes all elements from the array.

forEach(callback)

• callback:  function(T, number): void

Return Value:  None

Iterate over each element, calling the provided callback. The callback is called for each element like: callback(element, index).

getArray()

Parameters:  None

Returns a reference to the underlying Array. Warning: if the Array is mutated, no events will be fired by this object.

getAt(i)

• i:  number

Return Value:  T

Returns the element at the specified index.

getLength()

Parameters:  None

Return Value:  number

Returns the number of elements in this array.

insertAt(i, elem)

• i:  number
• elem:  T

Return Value:  None

Inserts an element at the specified index.

pop()

Parameters:  None

Return Value:  T

Removes the last element of the array and returns that element.

push(elem)

• elem:  T

Return Value:  number

Adds one element to the end of the array and returns the new length of the array.

removeAt(i)

• i:  number

Return Value:  T

Removes an element from the specified index.

setAt(i, elem)

• i:  number
• elem:  T

Return Value:  None

Sets an element at the specified index.

function(index)

• index:  number

This event is fired when insertAt() is called. The event passes the index that was passed to insertAt().

function(index, removed)

• index:  number
• removed:  T The element removed from the array at index.

This event is fired when removeAt() is called. The event passes the index that was passed to removeAt() and the element that was removed from the array.

function(index, previous)

• index:  number
• previous:  T The element that was previously in the array at index.

This event is fired when setAt() is called. The event passes the index that was passed to setAt() and the element that was previously in the array at that index.

google.maps.ErrorEvent interface

An event with an associated Error.

The Error related to the event.

Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.

Last updated 2025-07-09 UTC.

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