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November Edition
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   ► KBRole-Based T...Coding & OOGeneral Codi...   Print This     
Part of the mo. lesson in the Dec 09 Issue of Prestwood eMag
Coder Definition Flashcard:
 A flashcard from our Coder Flashcards Library
 A definition from our Coder Definitions Page
Definition: Event Handler

In computer programming, an event handler is part of event driven programming where the events are created by the framework based on interpreting inputs. Each event allows you to add code to an application-level event generated by the underlying framework, typically GUI triggers such as a key press, mouse movement, action selection, and an expired timer. In addition, events can represent data changes, new data, etc. Specifically, an event handler is an asynchronous callback subroutine that handles inputs received in a program.

A custom event is a programmer created event. For example, you can contrast an event handler with a member event, an OOP concept where you add an event to a class.


More Info

Code:  Delphi Event Handler
Code:  Delphi Prism Event Handler
Code:  JavaScript Event Handler
Article:  JavaScript Event Model

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Definition Contributed By Mike Prestwood:

Mike Prestwood is a drummer, an author, and creator of the PrestwoodBoards online community. He is the President & CEO of Prestwood IT Solutions. Prestwood IT provides Coding, Website, and Computer Tech services. Mike has authored 6 computer books and over 1,200 articles. As a drummer, he maintains play-drums.com and has authored 3 drum books. If you have a project you wish to discuss with Mike, you can send him a private message through his PrestwoodBoards home page or call him 9AM to 4PM PST at 916-726-5675 x205.

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