Events Class

Constructor

Events
(
  • loggerClass
)

Parameters:

  • loggerClass Object

Methods

_getEvents () Object

Fetches the events object and creates one if required.

Returns:

Object:

The events storage object.

_getOnceReturnValue () | Boolean

Fetches the current value to check against when executing listeners. If the listeners return value matches this one then it should be removed automatically. It will return true by default.

Returns:

| Boolean:

The current value to check for or the default, true.

addListener
(
  • evt
  • listener
)
Object

Adds a listener function to the specified event. The listener will not be added if it is a duplicate. If the listener returns true then; it will be removed after it is called. If you pass a regular expression as the event name then; the listener will be added to all events that match it.

Parameters:

  • evt String | RegExp

    Name of the event to attach the listener to.

  • listener Function

    Method to be called when the event is emitted. If the function returns true then it will be removed after calling.

Returns:

Object:

Current instance of EventEmitter for chaining.

addListeners
(
  • evt
  • [listeners]
)
Object

Adds listeners in bulk using the manipulateListeners method. If you pass an object as the first argument you can add to multiple events at once. The object should contain key value pairs of events and listeners or listener arrays. You can also pass it an event name and an array of listeners to be added. Can pass it a regular expression to add the array of listeners to all events that match it. Yeah, this function does quite a bit. That's probably a bad thing.

Parameters:

  • evt String | Object | RegExp

    An event name if you will pass an array of listeners next. An object if you wish to add to multiple events at once.

  • [listeners] Function optional

    An optional array of listener functions to add.

Returns:

Object:

Current instance of EventEmitter for chaining.

addOnceListener
(
  • evt
  • listener
)
Object

Semi-alias of addListener. It will add a listener that will be automatically removed after its first execution.

Parameters:

  • evt String | RegExp

    Name of the event to attach the listener to.

  • listener Function

    Method to be called when the event is emitted. If the function returns true then it will be removed after calling.

Returns:

Object:

Current instance of EventEmitter for chaining.

alias
(
  • name
)
Function

Alias a method while keeping the context correct, to allow for overwriting of target method.

Parameters:

  • name String

    The name of the target method.

Returns:

Function:

The aliased method

defineEvent
(
  • evt
)
Object

Defines an event name. This is required if you want to use a regex to add a listener to multiple events at once. If you don't do this then how do you expect it to know what event to add to? Should it just add to every possible match for a regex? No. That is scary and bad. You need to tell it what event names should be matched by a regex.

Parameters:

  • evt String

    Name of the event to create.

Returns:

Object:

Current instance of EventEmitter for chaining.

defineEvents
(
  • evts
)
Object

Uses defineEvent to define multiple events.

Parameters:

  • evts String

    An array of event names to define.

Returns:

Object:

Current instance of EventEmitter for chaining.

emit
(
  • evt
  • Optional
)
Object

Subtly different from emitEvent in that it will pass its arguments on to the listeners, as opposed to taking a single array of arguments to pass on. you can pass a regex in place of the event name to emit to all events that match it.

Parameters:

  • evt String | RegExp

    Name of the event to emit and execute listeners for.

  • Optional ...

    additional arguments to be passed to each listener.

Returns:

Object:

Current instance of EventEmitter for chaining.

flattenListeners
(
  • listeners
)
Function

Takes a list of listener objects and flattens it into a list of listener functions.

Parameters:

  • listeners Object

    Raw listener objects.

Returns:

Function:

Just the listener functions.

getListeners
(
  • evt
)
Function | Object

Returns the listener array for the specified event. Will initialise the event object and listener arrays if required. Will return an object if you use a regex search. The object contains keys for each matched event. So /ba[rz]/ might return an object containing bar and baz. But only if you have either defined them with defineEvent or added some listeners to them. Each property in the object response is an array of listener functions.

Parameters:

  • evt String | RegExp

    Name of the event to return the listeners from.

Returns:

Function | Object:

All listener functions for the event.

getListenersAsObject
(
  • evt
)
Object

Fetches the requested listeners via getListeners but will always return the results inside an object. This is mainly for internal use but others may find it useful.

Parameters:

  • evt String | RegExp

    Name of the event to return the listeners from.

Returns:

Object:

All listener functions for an event in an object.

indexOfListener
(
  • listeners
  • listener
)
Number

Finds the index of the listener for the event in its storage array.

Parameters:

  • listeners Function

    Array of listeners to search through.

  • listener Function

    Method to look for.

Returns:

Number:

Index of the specified listener, -1 if not found

isValidListener
(
  • listener
)

Parameters:

  • listener Object

Returns:

:

manipulateListeners
(
  • remove
  • evt
  • [listeners]
)
Object

Edits listeners in bulk. The addListeners and removeListeners methods both use this to do their job. You should really use those instead, this is a little lower level. The first argument will determine if the listeners are removed (true) or added (false). If you pass an object as the second argument you can add/remove from multiple events at once. The object should contain key value pairs of events and listeners or listener arrays. You can also pass it an event name and an array of listeners to be added/removed. You can pass it a regular expression to manipulate the listeners of all events that match it.

Parameters:

  • remove Boolean

    True if you want to remove listeners, false if you want to add.

  • evt String | Object | RegExp

    An event name if you will pass an array of listeners next.

  • [listeners] Function optional

    An optional array of listener functions to add/remove.

Returns:

Object:

Current instance of EventEmitter for chaining.

removeEvent
(
  • [evt]
)
Object

Removes all listeners from a specified event. If you do not specify an event then all listeners will be removed. That means every event will be emptied. You can also pass a regex to remove all events that match it.

Parameters:

  • [evt] String | RegExp optional

    Optional name of the event to remove all listeners for.

Returns:

Object:

Current instance of EventEmitter for chaining.

removeListener
(
  • evt
  • listener
)
Object

Removes a listener function from the specified event. When passed a regular expression as the event name, it will remove the listener from all events that match it.

Parameters:

  • evt String | RegExp

    Name of the event to remove the listener from.

  • listener Function

    Method to remove from the event.

Returns:

Object:

Current instance of EventEmitter for chaining.

removeListeners
(
  • evt
  • [listeners]
)
Object

Removes listeners in bulk using the manipulateListeners method. If you pass an object as the first argument you can remove from multiple events at once. The object should contain key value pairs of events and listeners or listener arrays. You can also pass it an event name and an array of listeners to be removed. You can also pass it a regular expression to remove the listeners from all events that match it.

Parameters:

  • evt String | Object | RegExp

    An event name if you will pass an array of listeners next. An object if you wish to remove from multiple events at once.

  • [listeners] Function optional

    An optional array of listener functions to remove.

Returns:

Object:

Current instance of EventEmitter for chaining.

setOnceReturnValue
(
  • value
)
Object

Sets the current value to check against when executing listeners. If a listeners return value matches the one set here then it will be removed after execution. This value defaults to true.

Parameters:

  • value

    The new value to check for when executing listeners.

Returns:

Object:

Current instance of EventEmitter for chaining.

triggerEvent
(
  • evt
  • [args]
)
Object

Emits an event of your choice. When emitted, every listener attached to that event will be executed. If you pass the optional argument array then those arguments will be passed to every listener upon execution. Because it uses apply, your array of arguments will be passed as if you wrote them out separately. So they will not arrive within the array on the other side, they will be separate. You can also pass a regular expression to emit to all events that match it.

Parameters:

  • evt String | RegExp

    Name of the event to emit and execute listeners for.

  • [args] Array optional

    Optional array of arguments to be passed to each listener.

Returns:

Object:

Current instance of EventEmitter for chaining.

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