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Component Model Strawman: Declarative Syntax: Difference between revisions

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= Isolation =
= Isolation =
== Standalone Form ==


Moved to [[Component_Model_Strawman:_Isolation]]
Moved to [[Component_Model_Strawman:_Isolation]]
== Shared definition ==
In the default, these definitions are coming into the host document.
That means a providing HTML doesn’t have its own document nor the global object. Agents use these of the host document.
== Isolated definition ==
If the <tt>rel</tt> attribute contains the term <tt>isolate</tt>, the linked HTML is loaded as a separate document object.
The script inside the document is given a separate global object.
For the host document, there is no way to access the loaded document directly.
<pre>
<html>
  <head>
    <link rel=”component” type=”text/html” href="comment.html" confined>
  </head>
</html>
</pre>
[[User:Rolandsteiner|RolandSteiner]] Should we make <tt>isolate</tt> an attribute on <tt>link</tt> rather than a <tt>rel</tt> value? As Dimitri mentioned, this could be useful in general and would allow us to branch it off into a separate spec.
[[User:Morrita|Morrita]] Any declarative syntax is a part of other spec. This is cross-cutting view of multiple proposals. moved out confined declaration to standalone attribute. I have no idea how this works for other types of linked resources though.

Revision as of 21:12, 27 October 2011

Element Registration

Moved to Component_Model_Strawman:_Element_Registration

Shadow DOM Template

An initial shape of new shadow tree can be defined using a template element.


<head>
  <template id=”comment-template”>
    <div><content></content></div>
  </template>
</head>

A template is instantiated through

  • ShadowRoot constructor and
  • shadow-template CSS property.

The ShadowRoot constructor

The ShadowRoot constructor accepts a template element to instantiate.

  ..
  this.shadow = new ShadowRoot(this, document.getElementById(“comment-template”));
  ..

The shadow-template CSS property (brainstorming)

The template for shadow root also can be applied using CSS property.


.comment {
  shadow-template: url('#comment-template');
}

Note that imperatively-applied shadows always supersede shadows from the styling. Also, there is no way to access style-originated shadows from the scripting environment.

The Instantiation Event and Scripting

Even though the template can be used to define an extra visual representation for an element, It would be useful if author can attach a script for the template-generated shadow tree.

The template element generates an instantiation event for each template instantiation. Authors can listen it to setup event handlers for generated elements by the template. The event doesn't bubble, and it isn't cancelable.


<head>
  <template id=”comment-template”>
    <div><content></content></div>
  </template>
  <script>
  var e = document.getElementById("comment-template");
  e.addEventListener("instantiation", function(evt) {
    evt.root.querySelector("div").addEventListener("click", function(evt) { ... });
  });
  </script>
</head>

A template element also allows a script element as a child, whose script block can access HTMLTemplateElement.current to refer the enclosing template element.


<head>
  <template id=”comment-template”>
    <div><content></content></div>
    <script>
    HTMLTemplateElement.current.addEventListener("instantiation", function(evt) {
      evt.root.querySelector("div").addEventListener("click", function(evt) { ... });
    });
    </script>
  </template>
</head>

Isolation

Moved to Component_Model_Strawman:_Isolation