AsyncQueue Class

Extends EventTarget

Defined in: async-queue/js/async-queue.js:11

Module: async-queue

A specialized queue class that supports scheduling callbacks to execute sequentially, iteratively, even asynchronously.

Callbacks can be function refs or objects with the following keys. Only the fn key is required.

fn -- The callback function
context -- The execution context for the callbackFn.
args -- Arguments to pass to callbackFn.
timeout -- Millisecond delay before executing callbackFn. (Applies to each iterative execution of callback)
iterations -- Number of times to repeat the callback.
until -- Repeat the callback until this function returns true. This setting trumps iterations.
autoContinue -- Set to false to prevent the AsyncQueue from executing the next callback in the Queue after the callback completes.
id -- Name that can be used to get, promote, get the indexOf, or delete this callback.

Constructor

`AsyncQueue`

(

callback

)

Defined in async-queue/js/async-queue.js:11

Parameters:

callback Function | Object multiple

0..n callbacks to seed the queue

Index
Methods
Properties
Events

Item Index

Methods

`add`

(

callback

)

AsyncQueue chainable

Defined in async-queue/js/async-queue.js:319

Add any number of callbacks to the end of the queue. Callbacks may be provided as functions or objects.

Parameters:

callback Function | Object multiple

0..n callbacks

Returns:

AsyncQueue:

the AsyncQueue instance

`addTarget`

(

)

chainable

Inherited from EventTarget: 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

Inherited from EventTarget: 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 this 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`

()

Inherited from EventTarget: 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

Inherited from EventTarget: 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

Inherited from EventTarget: 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

)

Inherited from EventTarget: 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

Inherited from EventTarget: 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.

`getCallback`

(

id

)

Object

Defined in async-queue/js/async-queue.js:429

Retrieve a callback by its id. Useful to modify the configuration while the queue is running.

Parameters:

id String

the id assigned to the callback

Returns:

Object:

the callback object

`getEvent`

(

type
prefixed

)

CustomEvent

Inherited from EventTarget: 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`

()

Inherited from EventTarget: event-custom/js/event-facade.js:523

Returns an array of bubble targets for this object.

Returns:

EventTarget[]

`indexOf`

(

callback

)

Number

Defined in async-queue/js/async-queue.js:408

Returns the current index of a callback. Pass in either the id or callback function from getCallback.

Parameters:

callback String | Function

the callback or its specified id

Returns:

Number:

index of the callback or -1 if not found

`isRunning`

() Boolean

Defined in async-queue/js/async-queue.js:296

Determines if the queue is waiting for a callback to complete execution.

Returns:

Boolean:

true if queue is waiting for a from any initiated transactions

`next`

() Function

Defined in async-queue/js/async-queue.js:129

Returns the next callback needing execution. If a callback is configured to repeat via iterations or until, it will be returned until the completion criteria is met.

When the queue is empty, null is returned.

Returns:

Function:

the callback to execute

`on`

(

type
fn
[context]
[arg*]

)

EventHandle

Inherited from EventTarget: 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 this 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

Inherited from EventTarget: event-custom/js/event-target.js:124

Listen to a custom event hosted by this object one time. This is the equivalent to on 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 this 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

Inherited from EventTarget: event-custom/js/event-target.js:146

Listen to a custom event hosted by this object one time. This is the equivalent to after 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 this 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

Inherited from EventTarget: 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:

the detach category, if supplied,
the prefixed event type,
whether or not this is an after listener,
the supplied event type

`pause`

() AsyncQueue chainable

Defined in async-queue/js/async-queue.js:358

Pause the execution of the queue after the execution of the current callback completes. If called from code outside of a queued callback, clears the timeout for the pending callback. Paused queue can be restarted with q.run()

Returns:

AsyncQueue:

the AsyncQueue instance

`promote`

(

callback

)

AsyncQueue chainable

Defined in async-queue/js/async-queue.js:443

Promotes the named callback to the top of the queue. If a callback is currently executing or looping (via until or iterations), the promotion is scheduled to occur after the current callback has completed.

Parameters:

callback String | Object

the callback object or a callback's id

Returns:

AsyncQueue:

the AsyncQueue instance

`publish`

(

type
opts

)

CustomEvent

Inherited from EventTarget: 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 emitFacade 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 async is true.
- [preventable=true] Boolean optional
  
  whether or not preventDefault() has an effect.
- [preventedFn] Function optional
  
  a function that is executed when preventDefault() 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

`remove`

(

callback

)

AsyncQueue chainable

Defined in async-queue/js/async-queue.js:490

Removes the callback from the queue. If the queue is active, the removal is scheduled to occur after the current callback has completed.

Parameters:

callback String | Object

the callback object or a callback's id

Returns:

AsyncQueue:

the AsyncQueue instance

`removeTarget`

(

)

chainable

Inherited from EventTarget: event-custom/js/event-facade.js:533

Removes a bubble target

Parameters:

o EventTarget

the target to remove

`run`

() AsyncQueue chainable

Defined in async-queue/js/async-queue.js:207

Sets the queue in motion. All queued callbacks will be executed in order unless pause() or stop() is called or if one of the callbacks is configured with autoContinue: false.