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why to send generated Event Object to the EventListener ??

Ravi Kiran Va
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Joined: Apr 18, 2009
Posts: 2234

Hi

Please let me know what is the need for sending EventObject to the event Handler ?

For example if we select an Item inside a Combobox an ItemEvent will be generated , and we generally pass this event
to the Event Listener .

<mx:combobox id="combo" change = "calllistener(event)"/>



Please share your ideas .


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Paul Sturrock
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Joined: Apr 14, 2004
Posts: 10336

How does your event handler know anything about the event (other than its type) otherwise?


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Ravi Kiran Va
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Joined: Apr 18, 2009
Posts: 2234

Thanks , when i read about result , target and currentTarget i could know Events Object usage .

Hongli Li
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Joined: Oct 29, 2006
Posts: 124
when you want to carry additional information,you will carry those data with an eventoject, usually a customized eventObject, this is a great way of decoupling your application.


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Ravi Kiran Va
Ranch Hand

Joined: Apr 18, 2009
Posts: 2234

Thanks Hongli for the additional information .

usually a customized eventObject

But can you please tell me how will you suppourt this and how this will work ??

Thanks in advance.

Paul Sturrock
Bartender

Joined: Apr 14, 2004
Posts: 10336

You:
  • Write a custom event class
  • Write code that can trigger this event
  • Write and register an event handler for the event

  •  
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    subject: why to send generated Event Object to the EventListener ??