Apryse WebViewer

Class: EventHandler

Core. EventHandler

new EventHandler()

Methods

addEventListener(type, fn [, options])

Add a handler to the given event name
Parameters:
Name Type Argument Description
type string | number The name of the event to listen to
fn function The handler to be called when the event is triggered
options object <optional>
 Optional options object for addEventListener
Properties
Name Type Description
once boolean If true then the handler will be called only once
Returns:
Returns the object that 'addEventListener' is being called on
Type
object
Example
myObject.addEventListener('eventName', (eventParameter1, eventParameter2) => {
  ...
});

removeEventListener( [type] [, fn])

Remove a handler of the given event name and namespace (if given) or with a function reference
Parameters:
Name Type Argument Description
type string | number <optional>
 The name of the event to remove the handler of with an optional namespace.
fn function <optional>
 The handler associated with this event to be removed. If fn is undefined, all the handlers of the given event namespace will be removed. If you are not passing in this parameter then a namespace must be used with the event name.
Returns:
Returns the object that 'removeEventListener' is being called on
Type
object
Example
myObject.removeEventListener('eventName.namespace');
myObject.removeEventListener('eventName', fn);

trigger(type [, data])

Calls the handlers of the event name with given data
Parameters:
Name Type Argument Description
type string | number event name of which the handlers will be called.
data * <optional>
 data that will be passed to the handlers. If data is an array, it will be spread and then passed to the handlers
Returns:
Returns the object that 'trigger' is being called on
Type
object
Example
myObject.trigger('eventName');
myObject.trigger('eventName', [eventParameter1, eventParameter2]);