Class: Observer

Help4.observer.Observer(callback, derivedopt)

Base class for observers.

Constructor

new Observer(callback, derivedopt)

Parameters:
Name Type Attributes Description
callback Help4.observer.Callback
derived Object <optional>
Source:

Extends

Methods

(protected) ____defineStaticProperties()

auto define all to be cleaned properties
Overrides:
Source:
Throws:
Error

(protected) ____getClassConfig() → {Help4.jscore.Base.Params}

Overrides:
Source:
Returns:
Type
Help4.jscore.Base.Params

(protected) ____mergeDerivedParam(level0, type, value)

Parameters:
Name Type Description
level0 Help4.jscore.Base.Params
type string
value *
Overrides:
Source:
Throws:
Error

(protected) ____mergeDerivedParams(level0, level1)

Parameters:
Name Type Description
level0 Help4.jscore.Base.Params
level1 Help4.jscore.Base.Params
Overrides:
Source:
Throws:
Error

(protected) ____resolveDerivedParams(classConfig)

Parameters:
Name Type Description
classConfig Help4.jscore.Base.Params
Overrides:
Source:

(protected) _destroyControl(…keys)

destroys class properties
Parameters:
Name Type Attributes Description
keys string <repeatable>
Overrides:
Source:

(protected) _fireEvent(event) → {Help4.jscore.Base}

fires an event that can be observed from outside
Parameters:
Name Type Description
event Object the event to be fired
Overrides:
Source:
Returns:
Type
Help4.jscore.Base

(async, protected) _fireEvent2(event) → {Promise.<Array.<Help4.EmbeddedEvent.EventResponse>>}

fires an event that can be observed from outside
Parameters:
Name Type Description
event Object the event to be fired
Overrides:
Source:
Returns:
Type
Promise.<Array.<Help4.EmbeddedEvent.EventResponse>>

(protected) _fireEventSync(event) → {Array.<Help4.EmbeddedEvent.EventResponse>}

fires an event that can be observed from outside
Parameters:
Name Type Description
event Object the event to be fired
Overrides:
Source:
Returns:
Type
Array.<Help4.EmbeddedEvent.EventResponse>

addListener(eventType, listener) → {Help4.jscore.Base}

add an event listener
Parameters:
Name Type Description
eventType string | Array.<string> event type to be observed
listener Help4.EmbeddedEvent.Listener the callback function
Overrides:
Source:
Returns:
Type
Help4.jscore.Base

addListenerSync(eventType, listener) → {Help4.jscore.Base}

add an event listener
Parameters:
Name Type Description
eventType string | Array.<string> event type to be observed
listener Help4.EmbeddedEvent.Listener the callback function
Overrides:
Source:
Returns:
Type
Help4.jscore.Base

count() → {number}

returns the number of active connections
Source:
Returns:
Type
number

destroy()

destroys the observer
Overrides:
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disconnect() → {Help4.observer.Observer}

stops all observations
Source:
Returns:
Type
Help4.observer.Observer

isDestroyed() → {boolean}

whether instance is destroyed
Overrides:
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Returns:
Type
boolean

observe(target, optionsopt) → {Help4.observer.Observer}

starts target observation
Parameters:
Name Type Attributes Description
target * the to be observed target
options Object <optional>
 configuration, options, data
Source:
Returns:
Type
Help4.observer.Observer

removeListener(eventType, listener) → {Help4.jscore.Base}

remove an event listener
Parameters:
Name Type Description
eventType string | Array.<string>
listener Help4.EmbeddedEvent.Listener
Overrides:
Source:
Returns:
Type
Help4.jscore.Base