EventTarget - AlloyUI

`_getFullType`

(

type

)

String private

Defined in yui3/src/event-custom/js/event-target.js:564

Returns the fully qualified type, given a short type string. That is, returns "foo:bar" when given "bar" if "foo" is the configured prefix.

NOTE: This method, unlike _getType, does no checking of the value passed in, and is designed to be used with the low level _publish() method, for critical path implementations which need to fast-track publish for performance reasons.

Parameters:

type String

The short type to prefix

Returns:

String:

The prefixed type, if a prefix is set, otherwise the type passed in

`_getType`

() private

Defined in yui3/src/event-custom/js/event-target.js:36

If the instance has a prefix attribute and the event type is not prefixed, the instance prefix is applied to the supplied type.

`_hasPotentialSubscribers`

(

fullType

)

Boolean private

Provided by the event-custom-complex module.

Defined in yui3/src/event-custom/js/event-facade.js:643

Parameters:

fullType String

The fully prefixed type name

Returns:

Boolean:

Whether the event has potential subscribers or not

`_monitor`

(

what
eventType
o

)

private

Defined in yui3/src/event-custom/js/event-target.js:636

This is the entry point for the event monitoring system. You can monitor 'attach', 'detach', 'fire', and 'publish'. When configured, these events generate an event. click -> click_attach, click_detach, click_publish -- these can be subscribed to like other events to monitor the event system. Inividual published events can have monitoring turned on or off (publish can't be turned off before it it published) by setting the events 'monitor' config.

Parameters:

what String

'attach', 'detach', 'fire', or 'publish'
eventType String | CustomEvent

The prefixed name of the event being monitored, or the CustomEvent object.
o Object

Information about the event interaction, such as fire() args, subscription category, publish config

`_parseType`

() private

Defined in yui3/src/event-custom/js/event-target.js:52

Returns an array with the detach key (if provided), and the prefixed event name from _getType Y.on('detachcategory| menu:click', fn)

`_publish`

(

fullType
etOpts
ceOpts

)

CustomEvent private

Defined in yui3/src/event-custom/js/event-target.js:588

The low level event publish implementation. It expects all the massaging to have been done outside of this method. e.g. the type to fullType conversion. It's designed to be a fast path publish, which can be used by critical code paths to improve performance.

Parameters:

fullType String

The prefixed type of the event to publish.
etOpts Object

The EventTarget specific configuration to mix into the published event.
ceOpts Object

The publish specific configuration to mix into the published event.

Returns:

CustomEvent:

The published event. If called without <code>etOpts</code> or <code>ceOpts</code>, this will be the default <code>CustomEvent</code> instance, and can be configured independently.

`addTarget`

(

o

)

chainable

Provided by the event-custom-complex module.

Defined in yui3/src/event-custom/js/event-facade.js:496

Registers another EventTarget as a bubble target. Bubble order is determined by the order registered. Multiple targets can be specified.

Events can only bubble if emitFacade is true.

Included in the event-custom-complex submodule.

Parameters:

o EventTarget

the target to add

`after`

(

type
fn
[context]
[arg*]

)

EventHandle

Defined in yui3/src/event-custom/js/event-target.js:812

Subscribe to a custom event hosted by this object. The supplied callback will execute after any listeners add via the subscribe method, and after the default function, if configured for the event, has executed.

Parameters:

type String

The name of the event
fn Function

The callback to execute in response to the event
[context] Object optional

Override <code>this</code> object in callback
[arg*] Any optional

0..n additional arguments to supply to the subscriber

Returns:

EventHandle:

A subscription handle capable of detaching the subscription

`before`

()

Defined in yui3/src/event-custom/js/event-target.js:849

Executes the callback before a DOM event, custom event or method. If the first argument is a function, it is assumed the target is a method. For DOM and custom events, this is an alias for Y.on.

For DOM and custom events: type, callback, context, 0-n arguments

For methods: callback, object (method host), methodName, context, 0-n arguments

Returns:

detach handle

`bubble`

(

evt

)

Boolean

Provided by the event-custom-complex module.

Defined in yui3/src/event-custom/js/event-facade.js:554

Propagate an event. Requires the event-custom-complex module.

Parameters:

evt CustomEvent

the custom event to propagate

Returns:

Boolean:

the aggregated return value from Event.Custom.fire

`detach`

(

type
fn
context

)

EventTarget

Defined in yui3/src/event-custom/js/event-target.js:356

Detach one or more listeners the from the specified event

Parameters:

type String | Object

Either the handle to the subscriber or the type of event. If the type is not specified, it will attempt to remove the listener from all hosted events.
fn Function

The subscribed function to unsubscribe, if not supplied, all subscribers will be removed.
context Object

The custom object passed to subscribe. This is optional, but if supplied will be used to disambiguate multiple listeners that are the same (e.g., you subscribe many object using a function that lives on the prototype)

Returns:

EventTarget:

the host

`detachAll`

(

type

)

Defined in yui3/src/event-custom/js/event-target.js:479

Removes all listeners from the specified event. If the event type is not specified, all listeners from all hosted custom events will be removed.

Parameters:

type String

The type, or name of the event

`fire`

(

type
arguments

)

Boolean

Defined in yui3/src/event-custom/js/event-target.js:673

Fire a custom event by name. The callback functions will be executed from the context specified when the event was created, and with the following parameters.

The first argument is the event type, and any additional arguments are passed to the listeners as parameters. If the first of these is an object literal, and the event is configured to emit an event facade, that object is mixed into the event facade and the facade is provided in place of the original object.

If the custom event object hasn't been created, then the event hasn't been published and it has no subscribers. For performance sake, we immediate exit in this case. This means the event won't bubble, so if the intention is that a bubble target be notified, the event must be published on this object first.

Parameters:

type String | Object

The type of the event, or an object that contains a 'type' property.
arguments Object

an arbitrary set of parameters to pass to the handler. If the first of these is an object literal and the event is configured to emit an event facade, the event facade will replace that parameter after the properties the object literal contains are copied to the event facade.

Returns:

Boolean:

True if the whole lifecycle of the event went through, false if at any point the event propagation was halted.

`getEvent`

(

type
prefixed

)

CustomEvent

Defined in yui3/src/event-custom/js/event-target.js:793

Returns the custom event of the provided type has been created, a falsy value otherwise

Parameters:

type String

the type, or name of the event
prefixed String

if true, the type is prefixed already

Returns:

CustomEvent:

the custom event or null

`getTargets`

()

Provided by the event-custom-complex module.

Defined in yui3/src/event-custom/js/event-facade.js:523

Returns an array of bubble targets for this object.

Returns:

EventTarget[]

`on`

(

type
fn
[context]
[arg*]

)

EventHandle

Defined in yui3/src/event-custom/js/event-target.js:188

Subscribe a callback function to a custom event fired by this object or from an object that bubbles its events to this object.

 this.on("change", this._onChange, this);

Callback functions for events published with emitFacade = true will receive an EventFacade as the first argument (typically named "e"). These callbacks can then call e.preventDefault() to disable the behavior published to that event's defaultFn. See the EventFacade API for all available properties and methods. Subscribers to non-emitFacade events will receive the arguments passed to fire() after the event name.

To subscribe to multiple events at once, pass an object as the first argument, where the key:value pairs correspond to the eventName:callback.

 this.on({
                                                     "attrChange" : this._onAttrChange,
                                                     "change"     : this._onChange
                                                 });

You can also pass an array of event names as the first argument to subscribe to all listed events with the same callback.

 this.on([ "change", "attrChange" ], this._onChange);

Returning false from a callback is supported as an alternative to calling e.preventDefault(); e.stopPropagation();. However, it is recommended to use the event methods whenever possible.

Parameters:

type String

The name of the event
fn Function

The callback to execute in response to the event
[context] Object optional

Override <code>this</code> object in callback
[arg*] Any optional

0..n additional arguments to supply to the subscriber

Returns:

EventHandle:

A subscription handle capable of detaching that subscription

`once`

(

type
fn
[context]
[arg*]

)

EventHandle

Defined in yui3/src/event-custom/js/event-target.js:124

Listen to a custom event hosted by this object one time. This is the equivalent to <code>on</code> except the listener is immediatelly detached when it is executed.

Parameters:

type String

The name of the event
fn Function

The callback to execute in response to the event
[context] Object optional

Override <code>this</code> object in callback
[arg*] Any optional

0..n additional arguments to supply to the subscriber

Returns:

EventHandle:

A subscription handle capable of detaching the subscription

`onceAfter`

(

type
fn
[context]
[arg*]

)

EventHandle

Defined in yui3/src/event-custom/js/event-target.js:146

Listen to a custom event hosted by this object one time. This is the equivalent to <code>after</code> except the listener is immediatelly detached when it is executed.

Parameters:

type String

The name of the event
fn Function

The callback to execute in response to the event
[context] Object optional

Override <code>this</code> object in callback
[arg*] Any optional

0..n additional arguments to supply to the subscriber

Returns:

EventHandle:

A subscription handle capable of detaching that subscription

`parseType`

(

type
[pre]

)

Array

Defined in yui3/src/event-custom/js/event-target.js:168

Available since 3.3.0

Takes the type parameter passed to 'on' and parses out the various pieces that could be included in the type. If the event type is passed without a prefix, it will be expanded to include the prefix one is supplied or the event target is configured with a default prefix.

Parameters:

type String

the type
[pre] String optional

The prefix. Defaults to this._yuievt.config.prefix

Returns:

Array:

an array containing: <ul> <li>the detach category, if supplied,</li> <li>the prefixed event type,</li> <li>whether or not this is an after listener,</li> <li>the supplied event type</li> </ul>

`publish`

(

type
opts

)

CustomEvent

Defined in yui3/src/event-custom/js/event-target.js:503

Creates a new custom event of the specified type. If a custom event by that name already exists, it will not be re-created. In either case the custom event is returned.

Parameters:

type String

the type, or name of the event
opts Object

optional config params. Valid properties are:
- [broadcast=false] Boolean optional
 
 whether or not the YUI instance and YUI global are notified when the event is fired.
- [bubbles=true] Boolean optional
 
 Whether or not this event bubbles. Events can only bubble if <code>emitFacade</code> is true.
- [context=this] Object optional
 
 the default execution context for the listeners.
- [defaultFn] Function optional
 
 the default function to execute when this event fires if preventDefault was not called.
- [emitFacade=false] Boolean optional
 
 whether or not this event emits a facade.
- [prefix] String optional
 
 the prefix for this targets events, e.g., 'menu' in 'menu:click'.
- [fireOnce=false] Boolean optional
 
 if an event is configured to fire once, new subscribers after the fire will be notified immediately.
- [async=false] Boolean optional
 
 fireOnce event listeners will fire synchronously if the event has already fired unless <code>async</code> is <code>true</code>.
- [preventable=true] Boolean optional
 
 whether or not <code>preventDefault()</code> has an effect.
- [preventedFn] Function optional
 
 a function that is executed when <code>preventDefault()</code> is called.
- [queuable=false] Boolean optional
 
 whether or not this event can be queued during bubbling.
- [silent] Boolean optional
 
 if silent is true, debug messages are not provided for this event.
- [stoppedFn] Function optional
 
 a function that is executed when stopPropagation is called.
- [monitored] Boolean optional
 
 specifies whether or not this event should send notifications about when the event has been attached, detached, or published.
- [type] String optional
 
 the event type (valid option if not provided as the first parameter to publish).

Returns:

CustomEvent:

the custom event

`removeTarget`

(

o

)

chainable

Provided by the event-custom-complex module.

Defined in yui3/src/event-custom/js/event-facade.js:533

Removes a bubble target

Parameters:

o EventTarget

the target to remove

`subscribe`

() deprecated

Defined in yui3/src/event-custom/js/event-target.js:346

Deprecated: use on

subscribe to an event

`unsubscribe`

() deprecated

Defined in yui3/src/event-custom/js/event-target.js:469

Deprecated: use detach

detach a listener

`unsubscribeAll`

(

type

)

deprecated

Defined in yui3/src/event-custom/js/event-target.js:490

Deprecated: use detachAll

Removes all listeners from the specified event. If the event type is not specified, all listeners from all hosted custom events will be removed.

Parameters:

type String

The type, or name of the event

APIs

EventTarget Class

Index

Methods

Methods

_getFullType

Parameters:

Returns:

_getType

_hasPotentialSubscribers

Parameters:

Returns:

_monitor

Parameters:

_parseType

_publish

Parameters:

Returns:

addTarget

Parameters:

after

Parameters:

Returns:

before

Returns:

bubble

Parameters:

Returns:

detach

Parameters:

Returns:

detachAll

Parameters:

fire

Parameters:

Returns:

getEvent

Parameters:

Returns:

getTargets

Returns:

on

Parameters:

Returns:

once

Parameters:

Returns:

onceAfter

Parameters:

Returns:

parseType

Parameters:

Returns:

publish

Parameters:

Returns:

removeTarget

Parameters:

subscribe

unsubscribe

unsubscribeAll

Parameters:

`_getFullType`

`_getType`

`_hasPotentialSubscribers`

`_monitor`

`_parseType`

`_publish`

`addTarget`

`after`

`before`

`bubble`

`detach`

`detachAll`

`fire`

`getEvent`

`getTargets`

`on`

`once`

`onceAfter`

`parseType`

`publish`

`removeTarget`

`subscribe`

`unsubscribe`

`unsubscribeAll`