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Behavior Attachment

From WHATWG Wiki
Revision as of 19:31, 4 July 2011 by Dglazkov (talk | contribs)
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WORK IN PROGRESS

  • element is DOM element.
  • content is DOM content.
  • document is HTML document
Comparison between the decorator and element behavior attachment.
Decorator Element
Purpose Give existing content new behavior and/or appearance. Create new content building blocks.
Paradigm Aspect-Oriented Programming Object-Oriented Programming
Use Cases
  • Add special UI treatment to all vcards in a document.
  • Create an extension to provide extra download options for certain types of links.
  • Implement built-in HTML controls: input/textarea, media, etc.
  • Define an element to represent a customizable calendar view.
  • Define a button row control with application-specific grouping logic (see GMail button bars).
Identity Does not change the identity of the element. Creates a new type of element.
Lifetime Transient, added and removed dynamically. Permanent, originates with the element’s creation and exists through the lifetime.
Content Environment Foreign document or limited control of content. Full control of content.
Traits
  • Unobtrusive
  • Dynamic
  • Composable
  • Interoperable
Shadow Tree Each decorator must have its own shadow subtree, and the aggregate shadow tree of an element is composed out of these subtrees. Only one tree, initialized as the element is created.
DOM API Should avoid adding any extra methods or properties to the DOM element that’s being decorated. Explicitly interested in exposing methods or properties on the DOM element as its API.