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Custom Elements

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Revision as of 09:39, 15 January 2015 by Annevk (talk | contribs) (Created page with "== Upgrading == Upgrading is the concept of going from a piece of markup, such as <code><my-div data-teehee="💩"></my-div></code>, to an object in a tree. {| class="...")

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Upgrading

Upgrading is the concept of going from a piece of markup, such as <my-div data-teehee="💩"></my-div>, to an object in a tree.

Tactic Explanation Drawbacks
Brain transplant A basic element is created by the parser and a callback registered by the developer is invoked at a later point to turn that basic element into a custom element.
  • Not having identity at creation-time is a giant mismatch with the rest of the platform.
Dummy replacement A dummy element is created by the parser and replaced at a later point by an actual instance of the custom element created by invoking the constructor registered by the developer.
  • What about attributes on the dummy element?
  • What about event listeners on the dummy element?
  • What if the dummy element was removed from the tree (or moved around)?
  • Causes mutation observer "spam"
Synchronous constructor The constructor registered by the developer is invoked by the parser at the point the custom element is created and inserted into the tree.
  • Requires synchronization for document.write() for each custom element.
  • Nested event loop.
  • Does not work with asynchronously loaded assets.