Class Eventbus

constructor

• new Eventbus(name?): Eventbus

• Provides a constructor which optionally takes the eventbus name.

  Parameters

  • Optionalname: string

    Optional eventbus name.

  Returns Eventbus

callbackCount

• get callbackCount(): number

• Returns the current callback count.

  Returns number

  The current callback count.

eventCount

• get eventCount(): number

• Returns the current event count.

  Returns number

  Returns the current event count.

name

• get name(): string

• Returns the current eventbus name.

  Returns string

  The current eventbus name.

before

• before(count, name, callback, context?, options?): Eventbus

• Just like on, but causes the bound callback to fire several times up to the count specified before being removed. When multiple events are passed in using the space separated syntax, the event will fire count times for every event you passed in, not once for a combination of all events.

  Parameters

  • count: number

    Number of times the function will fire before being removed.
  • name: string | EventMap

    Event name(s) or event map.
  • callback: object | Function

    Event callback function or context for event map.
  • Optionalcontext: object

    Event context
  • Optionaloptions: EventOptions | EventOptionsOut

    Event registration options.

  Returns Eventbus

  This Eventbus instance.

entries

• entries(regex?): Generator<[string, Function, object, EventOptionsOut], void, unknown>

• Returns an iterable for all stored events yielding an array with event name, callback function, and event context.

  Parameters

  • Optionalregex: RegExp

    Optional regular expression to filter event names.

  Returns Generator<[string, Function, object, EventOptionsOut], void, unknown>

  Generator

  Yields

getOptions

• getOptions(name): EventOptionsOut

• Returns the options of an event name.

  Parameters

  • name: string

    Event name(s) to verify.

  Returns EventOptionsOut

  The event options.

getType

• getType(name): string

• Returns the trigger type of event name. Note: if trigger type is not set then undefined is returned for type otherwise 'sync' or 'async' is returned.

  Parameters

  • name: string

    Event name(s) to verify.

  Returns string

  The trigger type.

isGuarded

• isGuarded(name, data?): boolean

• Returns whether an event name is guarded.

  Parameters

  • name: string | EventMap

    Event name(s) or event map to verify.
  • Optionaldata: object

    Stores the output of which names are guarded.

  Returns boolean

  Whether the given event name is guarded.

keys

• keys(regex?): Generator<string, void, unknown>

• Returns an iterable for the event names / keys of registered event listeners.

  Parameters

  • Optionalregex: RegExp

    Optional regular expression to filter event names.

  Returns Generator<string, void, unknown>

  Yields

keysWithOptions

• keysWithOptions(regex?): Generator<[string, EventOptionsOut], void, unknown>

• Returns an iterable for the event names / keys of registered event listeners along with event options.

  Parameters

  • Optionalregex: RegExp

    Optional regular expression to filter event names.

  Returns Generator<[string, EventOptionsOut], void, unknown>

  Generator

  Yields

listenTo

• listenTo(obj, name, callback): Eventbus

• Tell an object to listen to a particular event on another object. The advantage of using this form, instead of other.on(event, callback, object), is that listenTo allows the object to keep track of the events, and they can be removed all at once later on. The callback will always be called with object as context.

  Parameters

  • obj: object

    Event context
  • name: string | EventMap

    Event name(s) or event map.
  • callback: object | Function

    Event callback function or context for event map.

  Returns Eventbus

  This Eventbus instance.

  Example

  view.listenTo(model, 'change', view.render);
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listenToBefore

• listenToBefore(count, obj, name, callback): Eventbus

• Just like listenTo, but causes the bound callback to fire count times before being removed.

  Parameters

  • count: number

    Number of times the function will fire before being removed.
  • obj: object

    Target event context.
  • name: string | EventMap

    Event name(s) or event map.
  • callback: object | Function

    Event callback function or context for event map.

  Returns Eventbus

  This Eventbus instance.

listenToOnce

• listenToOnce(obj, name, callback): Eventbus

• Just like listenTo, but causes the bound callback to fire only once before being removed.

  Parameters

  • obj: object

    Target event context
  • name: string | EventMap

    Event name(s) or event map.
  • callback: object | Function

    Event callback function or context for event map.

  Returns Eventbus

  This Eventbus instance.

off

• off(name?, callback?, context?): Eventbus

• Remove a previously-bound callback function from an object. If no context is specified, all the versions of the callback with different contexts will be removed. If no callback is specified, all callbacks for the event will be removed. If no event is specified, callbacks for all events will be removed.

  Note that calling model.off(), for example, will indeed remove all events on the model.

  Parameters

  • Optionalname: string | EventMap

    Event name(s) or event map.
  • Optionalcallback: Function

    Event callback function
  • Optionalcontext: object

    Event context

  Returns Eventbus

  This Eventbus instance.

  Example

  // Removes just the `onChange` callback.
  object.off('change', onChange);
  
  // Removes all 'change' callbacks.
  object.off('change');
  
  // Removes the `onChange` callback for all events.
  object.off(null, onChange);
  
  // Removes all callbacks for `context` for all events.
  object.off(null, null, context);
  
  // Removes all callbacks on `object`.
  object.off();
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on

• on(name, callback, context?, options?): Eventbus

• Bind a callback function to an object. The callback will be invoked whenever the event is fired. If you have a large number of different events on a page, the convention is to use colons to namespace them: 'poll:start', or 'change:selection'.

  To supply a context value for this when the callback is invoked, pass the optional last argument: model.on('change', this.render, this) or model.on({change: this.render}, this).

  Parameters

  • name: string | EventMap

    Event name(s) or event map.
  • callback: object | Function

    Event callback function or context for event map.
  • Optionalcontext: object

    Event context
  • Optionaloptions: EventOptions | EventOptionsOut

    Event registration options.

  Returns Eventbus

  This Eventbus instance.

  Example

  // The event string may also be a space-delimited list of several events...
  book.on('change:title change:author', ...);
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  Example

  Callbacks bound to the special 'all' event will be triggered when any event occurs, and are passed the name of
  the event as the first argument. For example, to proxy all events from one object to another:
  proxy.on('all', (eventName) => {
     object.trigger(eventName);
  });
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  Example

  All event methods also support an event map syntax, as an alternative to positional arguments:
  book.on({
     'change:author': authorPane.update,
     'change:title change:subtitle': titleView.update,
     'destroy': bookView.remove
  });
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once

• once(name, callback, context?, options?): Eventbus

• Just like on, but causes the bound callback to fire only once before being removed. Handy for saying "the next time that X happens, do this". When multiple events are passed in using the space separated syntax, the event will fire once for every event you passed in, not once for a combination of all events

  Parameters

  • name: string | EventMap

    Event name(s) or event map.
  • callback: object | Function

    Event callback function or context for event map.
  • Optionalcontext: object

    Event context.
  • Optionaloptions: EventOptions | EventOptionsOut

    Event registration options.

  Returns Eventbus

  This Eventbus instance.

stopListening

• stopListening(obj, name?, callback?): Eventbus

• Tell an object to stop listening to events. Either call stopListening with no arguments to have the object remove all of its registered callbacks ... or be more precise by telling it to remove just the events it's listening to on a specific object, or a specific event, or just a specific callback.

  Parameters

  • obj: object

    Event context
  • Optionalname: string

    Event name(s)
  • Optionalcallback: Function

    Event callback function

  Returns Eventbus

  This Eventbus instance.

  Example

  view.stopListening();
  
  view.stopListening(model);
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trigger

• trigger(name, ...args): Eventbus

• Trigger callbacks for the given event, or space-delimited list of events. Subsequent arguments to trigger will be passed along to the event callbacks.

  Parameters

  • name: string

    Event name(s)
  • Rest...args: any[]

    Additional arguments passed to the event function(s).

  Returns Eventbus

  This Eventbus instance.

triggerAsync

• triggerAsync(name, ...args): Promise<any>

• Provides trigger functionality, but collects any returned Promises from invoked targets and returns a single Promise generated by Promise.resolve for a single value or Promise.all for multiple results. This is a very useful mechanism to invoke asynchronous operations over an eventbus.

  Parameters

  • name: string

    Event name(s)
  • Rest...args: any[]

    Additional arguments passed to the event function(s).

  Returns Promise<any>

  A Promise with any results.

triggerDefer

• triggerDefer(name, ...args): Eventbus

• Defers invoking trigger. This is useful for triggering events in the next clock tick.

  Parameters

  • name: string

    Event name(s)
  • Rest...args: any[]

    Additional arguments passed to the event function(s).

  Returns Eventbus

  This Eventbus instance.

triggerSync

• triggerSync(name, ...args): any

• Provides trigger functionality, but collects any returned result or results from invoked targets as a single value or in an array and passes it back to the callee in a synchronous manner.

  Parameters

  • name: string

    Event name(s).
  • Rest...args: any[]

    Additional arguments passed to the event function(s).

  Returns any

  The results of the event invocation.

_listeners

_listenId

_listeningTo