- From: poot <cvsmail@w3.org>
- Date: Wed, 07 Sep 2011 17:56:47 -0400
- To: public-html-diffs@w3.org
hixie: Add script.readyState and fire 'readystatechange' in some cases.
Not 100% IE compatible because IE is pretty inconsistent here. Should be
compatible with legacy content though, both in browsers that do script
prefetch and those that don't. (whatwg r6543)
http://dev.w3.org/cvsweb/html5/spec/Overview.html?r1=1.5241&r2=1.5242&f=h
http://html5.org/tools/web-apps-tracker?from=6542&to=6543
===================================================================
RCS file: /sources/public/html5/spec/Overview.html,v
retrieving revision 1.5241
retrieving revision 1.5242
diff -u -d -r1.5241 -r1.5242
--- Overview.html 6 Sep 2011 07:23:11 -0000 1.5241
+++ Overview.html 7 Sep 2011 21:56:30 -0000 1.5242
@@ -321,7 +321,7 @@
<h1>HTML5</h1>
<h2 class="no-num no-toc" id="a-vocabulary-and-associated-apis-for-html-and-xhtml">A vocabulary and associated APIs for HTML and XHTML</h2>
- <h2 class="no-num no-toc" id="editor-s-draft-6-september-2011">Editor's Draft 6 September 2011</h2>
+ <h2 class="no-num no-toc" id="editor-s-draft-7-september-2011">Editor's Draft 7 September 2011</h2>
<dl><dt>Latest Published Version:</dt>
<dd><a href="http://www.w3.org/TR/html5/">http://www.w3.org/TR/html5/</a></dd>
<dt>Latest Editor's Draft:</dt>
@@ -467,7 +467,7 @@
Group</a> is the W3C working group responsible for this
specification's progress along the W3C Recommendation
track.
- This specification is the 6 September 2011 Editor's Draft.
+ This specification is the 7 September 2011 Editor's Draft.
</p><!-- UNDER NO CIRCUMSTANCES IS THE PRECEDING PARAGRAPH TO BE REMOVED OR EDITED WITHOUT TALKING TO IAN FIRST --><p>Work on this specification is also done at the <a href="http://www.whatwg.org/">WHATWG</a>. The W3C HTML working group
actively pursues convergence with the WHATWG, as required by the <a href="http://www.w3.org/2007/03/HTML-WG-charter">W3C HTML working
group charter</a>.</p><!-- UNDER NO CIRCUMSTANCES IS THE FOLLOWING PARAGRAPH TO BE REMOVED OR EDITED WITHOUT TALKING TO IAN FIRST --><p>This document was produced by a group operating under the <a href="http://www.w3.org/Consortium/Patent-Policy-20040205/">5
@@ -12509,6 +12509,8 @@
attribute DOMString <a href="#dom-script-type" title="dom-script-type">type</a>;
attribute DOMString <a href="#dom-script-charset" title="dom-script-charset">charset</a>;
attribute DOMString <a href="#dom-script-text" title="dom-script-text">text</a>;
+
+ readonly attribute DOMString <a href="#dom-script-readystate" title="dom-script-readyState">readyState</a>;
};</pre>
</dd>
</dl><p>The <code><a href="#the-script-element">script</a></code> element allows authors to include dynamic
@@ -12607,6 +12609,38 @@
<a href="#parser-inserted">"parser-inserted"</a>, to let the parser know when to
execute the script.</p>
+ <p>The fifth is the <dfn id="concept-script-state" title="concept-script-state">current
+ status</dfn> of the script. This is a string. When the element is
+ created, if the user agent does not intend to prefetch the script
+ (i.e. the script, if any, will only be obtained once the
+ <a href="#prepare-a-script">prepare a script</a> algorithm requires it to be fetched),
+ then the <a href="#concept-script-state" title="concept-script-state">current status</a>
+ must be set to "<code title="">loaded</code>". If the user agent
+ <em>does</em> intend to prefetch the script (if any), <a href="#scriptPrefetch">as allowed</a> in the <a href="#prepare-a-script">prepare a
+ script</a> algorithm below, the <a href="#concept-script-state" title="concept-script-state">current status</a> must be set to
+ "<code title="">uninitialized</code>" when the element is created.
+ When the user agent begins to prefetch the script, it must set the
+ <a href="#concept-script-state" title="concept-script-state">current status</a> to "<code title="">loading</code>". Once the script is fetched, the user agent
+ must <a href="#queue-a-task">queue a task</a> that, if the <a href="#prepare-a-script">prepare a
+ script</a> algorithm has still not started and the fetched script
+ is still the appropriate script, sets the <a href="#concept-script-state" title="concept-script-state">current status</a> to "<code title="">loaded</code>" and <a href="#fire-a-simple-event" title="fire a simple event">fires
+ a simple event</a> named <code title="event-readystatechange"><a href="#event-readystatechange">readystatechange</a></code> at the
+ element. If the script to be loaded changes while the script is
+ being prefetched, then the user agent must prefetch the new script
+ (if any), without changing the <a href="#concept-script-state" title="concept-script-state">current status</a>. If no script is
+ ever successfully fetched (e.g. because the element is an inline
+ script) then the transition to "<code title="">loaded</code>" is
+ skipped, and so the <code title="event-readystatechange"><a href="#event-readystatechange">readystatechange</a></code> event does
+ not fire for this transition (it still fires when the <a href="#concept-script-state" title="concept-script-state">current status</a> is set to "<code title="">complete</code>" later, however). If the script to be
+ loaded changes after a script has been successfully prefetched, the
+ user agent may prefetch the new script but must not change the <a href="#concept-script-state" title="concept-script-state">current status</a> or fire any
+ events as a result. If the user agent changes its mind and decides
+ to not bother prefetching the script after all, the user agent must
+ <a href="#queue-a-task">queue a task</a> that, if the <a href="#prepare-a-script">prepare a
+ script</a> algorithm has still not started, sets the <a href="#concept-script-state" title="concept-script-state">current status</a> to "<code title="">loaded</code>" and <a href="#fire-a-simple-event" title="fire a simple event">fires
+ a simple event</a> named <code title="event-readystatechange"><a href="#event-readystatechange">readystatechange</a></code> at the
+ element.</p>
+
<p>The last few pieces of state are <dfn id="the-script-block-s-type"><var>the script block's
type</var></dfn>, <dfn id="the-script-block-s-character-encoding"><var>the script block's character
encoding</var></dfn>, and <dfn id="the-script-block-s-fallback-character-encoding"><var>the script block's fallback
@@ -12834,10 +12868,20 @@
user agent must act as if it had received an empty HTTP 400
response.</p>
- <p>For performance reasons, user agents may start fetching the
- script as soon as the attribute is set, instead, in the hope that
- the element will be inserted into the document. Either way, once
- the element is <a href="#insert-an-element-into-a-document" title="insert an element into a
+ <p>If the <a href="#concept-script-state" title="concept-script-state">current status</a>
+ of the element at this stage is still "<code title="">uninitialized</code>" (meaning that the user agent
+ intended to prefetch the script as described in the next
+ paragraph, but the <a href="#prepare-a-script">prepare a script</a> algorithm was
+ started before it had a chance to do so), then, if a
+ <a href="#fetch">fetch</a> attempt was started in this step, the user
+ agent must set the <a href="#concept-script-state" title="concept-script-state">current
+ status</a> to "<code title="">loading</code>" . </p>
+ <p id="scriptPrefetch">For performance reasons, user agents may
+ start fetching the script as soon as the attribute is set,
+ instead, in the hope that the element will be inserted into the
+ document (user agents that do this have <a href="#concept-script-state" title="concept-script-state">requirements</a> relating to what
+ events are to be fired during the process). Either way, once the
+ element is <a href="#insert-an-element-into-a-document" title="insert an element into a
document">inserted into the document</a>, the load must have
started. If the UA performs such prefetching, but the element is
never inserted in the document, or the <code title="attr-script-src"><a href="#attr-script-src">src</a></code> attribute is dynamically
@@ -13012,6 +13056,18 @@
<ol><li>
+ <p>If the <a href="#concept-script-state" title="concept-script-state">current status</a>
+ of the element at this stage is "<code title="">loading</code>"
+ (meaning that the user agent intended to <a href="#scriptPrefetch">prefetch the script</a> as allowed by the
+ <a href="#prepare-a-script">prepare a script</a> algorithm, but the fetch was not
+ completed before that algorithm was started), then the user agent
+ must set the <a href="#concept-script-state" title="concept-script-state">current
+ status</a> to "<code title="">loaded</code>".</p>
+
+ </li>
+
+ <li>
+
<p>If the element is flagged as <a href="#parser-inserted">"parser-inserted"</a>,
but the element's <code><a href="#document">Document</a></code> is not the
<code><a href="#document">Document</a></code> of the parser that created the element, then
@@ -13026,8 +13082,20 @@
<dl class="switch"><dt>If the load resulted in an error (for example a DNS error, or
an HTTP 404 error)</dt>
- <dd><p>Executing the script block must just consist of <a href="#fire-a-simple-event" title="fire a simple event">firing a simple event</a> named
- <code title="event-error">error</code> at the element.</dd>
+ <dd>
+
+ <p>Executing the script block must consist of running the following steps:</p>
+
+ <ol><li><p>Set the <a href="#concept-script-state" title="concept-script-state">current
+ status</a> to "<code title="">complete</code>".</li>
+
+ <li><p><a href="#fire-a-simple-event">Fire a simple event</a> named <code title="event-readystatechange"><a href="#event-readystatechange">readystatechange</a></code> at the
+ element.</li>
+
+ <li><p><a href="#fire-a-simple-event">Fire a simple event</a> named <code title="event-error">error</code> at the element.</li>
+
+ </ol></dd>
+
<dt>If the load was successful</dt>
@@ -13146,6 +13214,9 @@
</li>
+ <li><p>Set the <a href="#concept-script-state" title="concept-script-state">current
+ status</a> to "<code title="">interactive</code>".</li>
+
<li>
<p><a href="#create-a-script-from-a-node" title="create a script from a node">Create a
@@ -13166,6 +13237,12 @@
</li>
+ <li><p>Set the <a href="#concept-script-state" title="concept-script-state">current
+ status</a> to "<code title="">complete</code>".</li>
+
+ <li><p><a href="#fire-a-simple-event">Fire a simple event</a> named <code title="event-readystatechange"><a href="#event-readystatechange">readystatechange</a></code> at the
+ element.</li>
+
<li>
<p>If the script is from an external file, <a href="#fire-a-simple-event">fire a simple
@@ -13210,6 +13287,51 @@
</dd>
+
+ <dt><var title="">script</var> . <code title="dom-script-readyState"><a href="#dom-script-readystate">readyState</a></code></dt>
+
+ <dd>
+
+ <p>Returns the current state of the element. The value is one of
+ the following:</p>
+
+ <dl><dt>"<code title="">uninitialized</code>"</dt>
+
+ <dd><p>The script file, if any, has not yet been loaded, but the
+ user agent will try to prefetch it as soon as possible (e.g. as
+ soon as the <code title="attr-script-src"><a href="#attr-script-src">src</a></code> attribute is
+ set).</dd>
+
+
+ <dt>"<code title="">loading</code>"</dt>
+
+ <dd><p>A script file is being downloaded in a user agent that
+ supports prefetching scripts.</dd>
+
+
+ <dt>"<code title="">loaded</code>"</dt>
+
+ <dd><p>Either a script file is loaded and ready to be executed,
+ or the script file is not loaded but the user agent does not
+ intend to prefetch the script file anyway, and will merely fetch
+ it when it is to be executed. If the element started in the <code title="">uninitialized</code>" state and the script has not yet
+ begun to be executed, then a <code title="event-readystatechange"><a href="#event-readystatechange">readystatechange</a></code> event is
+ fired when the state changes to this value.</dd>
+
+
+ <dt>"<code title="">interactive</code>"</dt>
+
+ <dd><p>The script is running.</dd>
+
+
+ <dt>"<code title="">complete</code>"</dt>
+
+ <dd><p>The script has been executed (or it failed). A <code title="event-readystatechange"><a href="#event-readystatechange">readystatechange</a></code> event is
+ fired when the state changes to this value, just before the
+ corresponding <code title="event-load">load</code> or <code title="event-error">error</code> event.</dd>
+
+ </dl></dd>
+
</dl><div class="impl">
<p>The IDL attribute <dfn id="dom-script-text" title="dom-script-text"><code>text</code></dfn> must return a
@@ -13219,6 +13341,10 @@
tree order. On setting, it must act the same way as the
<code><a href="#textcontent">textContent</a></code> IDL attribute.</p>
+ <p>The IDL attribute <dfn id="dom-script-readystate" title="dom-script-readyState"><code>readyState</code></dfn> must
+ return the element's <a href="#concept-script-state" title="concept-script-state">current
+ status</a>.</p>
+
</div><p class="note">When inserted using the <code title="dom-document-write"><a href="#dom-document-write">document.write()</a></code> method,
<code><a href="#the-script-element">script</a></code> elements execute (typically synchronously), but
when inserted using <code title="dom-innerHTML">innerHTML</code> and <code title="dom-outerHTML">outerHTML</code> attributes, they do not
Received on Wednesday, 7 September 2011 21:56:49 UTC