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   <h1 class="head">Progress Events</h1>

   <h2 class="no-num no-toc" id="w3c-doctype">W3C Candidate Recommendation 22 September 2011</h2>

   <dl>
    <dt>This Version:</dt>
  <dd class="publish"><a href="http://www.w3.org/TR/2011/CR-progress-events-20110922/">http://www.w3.org/TR/2011/CR-progress-events-20110922/</a>

    <dt class="publish">Latest Version:</dt>
    <dd class="publish"><a href="http://www.w3.org/TR/progress-events">http://www.w3.org/TR/progress-events</a></dd>

  <dt class="publish">Latest Editor Draft:
  <dd class="publish"><a href="http://dev.w3.org/2006/webapi/progress/">http://dev.w3.org/2006/webapi/progress/</a></dd>

    <dt>Previous Versions:</dt>
    <dd><a href="http://www.w3.org/TR/2011/WD-progress-events-20110809/">http://www.w3.org/TR/2011/WD-progress-events-20110809/</a></dd>
    <dd><a href="http://www.w3.org/TR/2011/WD-progress-events-20110310/">http://www.w3.org/TR/2011/WD-progress-events-20110310/</a></dd>
    <dd><a href="http://www.w3.org/TR/2010/WD-progress-events-20101019/">http://www.w3.org/TR/2010/WD-progress-events-20101019/</a></dd>
    <dd><a href="http://www.w3.org/TR/2008/WD-progress-events-20080521/">http://www.w3.org/TR/2008/WD-progress-events-20080521/</a></dd>
    <dd><a href="http://www.w3.org/TR/2007/WD-progress-events-20071023/">http://www.w3.org/TR/2007/WD-progress-events-20071023/</a></dd>
    <dd><a href="http://www.w3.org/TR/2007/WD-progress-events-20070419/">http://www.w3.org/TR/2007/WD-progress-events-20070419/</a></dd>

    <dt>Editor:</dt>
    <dd><a href="http://annevankesteren.nl/">Anne van Kesteren</a>
     (<a href="http://www.opera.com/">Opera Software</a>)
     &lt;<a href="mailto:annevk@opera.com">annevk@opera.com</a>&gt;</dd>

    <dt>Former Editor:</dt>
    <dd>Charles McCathieNevile
    (<a href="http://www.opera.com/">Opera Software</a>)
     &lt;<a href="mailto:chaals@opera.com">chaals@opera.com</a>&gt;</dd>
   </dl>


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  <hr>

  <h2 class="no-num no-toc" id="specabstract">Abstract</h2>

  <p>The Progress Events specification defines an event interface that can
  be used for measuring progress; e.g. HTTP entity body transfers. This
  specification is primarily meant to be used by other specifications.</p>

  <h2 class="no-num no-toc" id="sotd">Status of this Document</h2>

  <p><em>This section describes the status of this document at the time of
  its publication. Other documents may supersede this document. A list of
  current W3C publications and the latest revision of this technical report
  can be found in the
  <a href="http://www.w3.org/TR/">W3C technical reports index</a> at
  http://www.w3.org/TR/.</em></p>

  <p>This is the 22 September 2011 <!--Last Call Working Draft-->W3C Candidate Recommendation of
  Progress Events. Please send comments to
  <a href="mailto:public-webapps@w3.org?subject=%5Bprogress-events%5D%20">public-webapps@w3.org</a>
  (<a href="http://lists.w3.org/Archives/Public/public-webapps/">archived</a>)
  <!--by 1 September 2011-->
  with <samp>[progress-events]</samp> at the start of the subject line.</p>

  <p>This document is produced by the
  <a href="http://www.w3.org/2008/webapps/">Web Applications</a> (WebApps) Working Group.
  The WebApps Working Group is part of the
  <a href="http://www.w3.org/2006/rwc/Activity">Rich Web Clients Activity</a>
  in the W3C <a href="http://www.w3.org/Interaction/">Interaction Domain</a>.</p>

  <p>This document was produced by a group operating under the
  <a href="http://www.w3.org/Consortium/Patent-Policy-20040205/">5 February 2004
  W3C Patent Policy</a>. W3C maintains a
  <a href="http://www.w3.org/2004/01/pp-impl/42538/status" rel="disclosure">public
  list of any patent disclosures</a> made in connection with the deliverables of
  the group; that page also includes instructions for disclosing a patent. An
  individual who has actual knowledge of a patent which the individual believes
  contains
  <a href="http://www.w3.org/Consortium/Patent-Policy-20040205/#def-essential">Essential
  Claim(s)</a> must disclose the information in accordance with
  <a href="http://www.w3.org/Consortium/Patent-Policy-20040205/#sec-Disclosure">section
  6 of the W3C Patent Policy</a>.</p>

  <p>Publication as a Working Draft does not imply endorsement by the W3C
  Membership. This is a draft document and may be updated, replaced or
  obsoleted by other documents at any time. It is inappropriate to cite this
  document as other than work in progress.</p>

<h3 class="no-num no-toc" id="crec">Candidate Recommendation Exit Criteria</h3>

<p>To exit the Candidate Recommendation (CR) stage the following criteria
must have been met:

<ol>
 <li>There will be at least two interoperable implementations passing all
 test cases in the
 <a href="http://dvcs.w3.org/hg/webapps/file/tip/ProgressEvents">test suite</a>
 for this specification. An implementation is to be available (i.e. for
 download), shipping (i.e. not private), and not experimental (i.e. intended
 for a wide audience). The working group will decide when the test suite is
 of sufficient quality to test interoperability and will produce
 implementation reports (hosted together with the test suite).

 <li>A minimum of three months of the CR stage will have elapsed (i.e. not
 until after 22 December 2011). This is to ensure that enough time is given
 for any remaining major errors to be caught. The CR period will be extended
 if implementations are slow to appear.
</ol>


<h2 class="no-num no-toc" id="toc">Table of Contents</h2>


<!--begin-toc-->
<ol class="toc">
 <li><a href="#introduction"><span class="secno">1 </span>Introduction</a></li>
 <li><a href="#conformance"><span class="secno">2 </span>Conformance</a></li>
 <li><a href="#terminology"><span class="secno">3 </span>Terminology</a></li>
 <li><a href="#interface-progressevent"><span class="secno">4 </span>Interface <code title="">ProgressEvent</code></a>
  <ol class="toc">
   <li><a href="#firing-events-using-the-progressevent-interface-for-http"><span class="secno">4.1 </span>Firing events using the <code title="">ProgressEvent</code> interface for HTTP</a></li>
   <li><a href="#firing-events-using-the-progressevent-interface-for-other-contexts"><span class="secno">4.2 </span>Firing events using the <code title="">ProgressEvent</code> interface for other contexts</a></li>
   <li><a href="#suggested-names-for-events-using-the-progressevent-interface"><span class="secno">4.3 </span>Suggested names for events using the <code title="">ProgressEvent</code> interface</a></li>
   <li><a href="#security-considerations"><span class="secno">4.4 </span>Security Considerations</a></ol></li>
 <li><a class="no-num" href="#references">References</a>
  <ol class="toc">
   <li><a class="no-num" href="#normative-references">Normative references</a></li>
   <li><a class="no-num" href="#informative-references">Informative references</a></ol></li>
 <li><a class="no-num" href="#acknowledgments">Acknowledgments</a></ol>
<!--end-toc-->


  <h2 id="introduction"><span class="secno">1 </span>Introduction</h2>

  <p><em>This section is non-normative.</em></p>

  <p>This specification defines an event interface &mdash;
  <code title="">ProgressEvent</code> &mdash; that can be used for measuring
  progress. Other specifications use this specification for that
  purpose.</p>

  <div class="example">
   <p>In this example <code class="external"><a href="http://dev.w3.org/2006/webapi/XMLHttpRequest-2/#xmlhttprequest">XMLHttpRequest</a></code>,
   combined with concepts defined in this specification, and the HTML
   <code class="external"><a href="http://www.whatwg.org/specs/web-apps/current-work/multipage/the-button-element.html#the-progress-element">progress</a></code> element are used together to
   display the process of fetching a resource.
   <a class="informative" href="#refsXHR">[XHR]</a>
   <a class="informative" href="#refsHTML">[HTML]</a>

   <pre>&lt;!DOCTYPE html&gt;
&lt;title&gt;Waiting for Magical Unicorns&lt;/title&gt;
&lt;progress id=p&gt;&lt;/progress&gt;
&lt;script&gt;
  var progressBar = document.getElementById("p"),
      client = new XMLHttpRequest()
  client.open("GET", "magical-unicorns")
  client.onprogress = function(pe) {
    if(pe.lengthComputable) {
      progressBar.max = pe.total
      progressBar.value = pe.loaded
    }
  }
  client.onloadend = function(pe) {
    progressBar.value = pe.loaded
  }
  client.send()
&lt;/script&gt;</pre>

   <p>Fully working code would of course be more elaborate and deal with
   more scenarios, such as network errors or the end user terminating the
   request.</p>
  </div>


  <h2 id="conformance"><span class="secno">2 </span>Conformance</h2>

  <p>Everything in this specification is normative except for diagrams,
  examples, notes and sections marked non-normative.</p>

  <p>The key word must in this document is to be interpreted as
  described in RFC 2119. <a href="#refsRFC2119">[RFC2119]</a>

  <p>A user agent must also be a conforming implementation of the IDL
  fragments in this specification, as described in the Web IDL
  specification. <a href="#refsWEBIDL">[WEBIDL]</a>

  <p>A user agent must also be a conforming implementation of DOM4.
  <a href="#refsDOM">[DOM]</a>


  <h2 id="terminology"><span class="secno">3 </span>Terminology</h2>

  <p>Terminology used in this specification is from DOM4 and HTTP.
  <a href="#refsDOM">[DOM]</a>
  <a href="#refsHTTP">[HTTP]</a>


  <h2 id="interface-progressevent"><span class="secno">4 </span>Interface <code title="">ProgressEvent</code></h2>

  <pre class="idl">[Constructor(DOMString <var title="">type</var>, optional <a href="#progresseventinit">ProgressEventInit</a> <var title="">eventInitDict</var>)]
interface <dfn id="progressevent">ProgressEvent</dfn> : <a class="external" href="http://dvcs.w3.org/hg/domcore/raw-file/tip/Overview.html#event">Event</a> {
  readonly attribute boolean <a href="#dom-progressevent-lengthcomputable" title="dom-ProgressEvent-lengthComputable">lengthComputable</a>;
  readonly attribute unsigned long long <a href="#dom-progressevent-loaded" title="dom-ProgressEvent-loaded">loaded</a>;
  readonly attribute unsigned long long <a href="#dom-progressevent-total" title="dom-ProgressEvent-total">total</a>;
};

dictionary <dfn id="progresseventinit">ProgressEventInit</dfn> : <a class="external" href="http://dvcs.w3.org/hg/domcore/raw-file/tip/Overview.html#eventinit">EventInit</a> {
  boolean <span title="dom-ProgressEventInit-lengthComputable">lengthComputable</span>;
  unsigned long long <span title="dom-ProgressEventInit-loaded">loaded</span>;
  unsigned long long <span title="dom-ProgressEventInit-total">total</span>;
}</pre>

<p><a class="external" href="http://dvcs.w3.org/hg/domcore/raw-file/tip/Overview.html#concept-event" title="concept-event">Events</a> using
the <code><a href="#progressevent">ProgressEvent</a></code> interface indicate some kind of
progression.</p>

<p>The
<dfn id="dom-progressevent-lengthcomputable" title="dom-ProgressEvent-lengthComputable"><code>lengthComputable</code></dfn>
attribute must return the value it was initialized to. When an
<a class="external" href="http://dvcs.w3.org/hg/domcore/raw-file/tip/Overview.html#concept-event" title="concept-event">event</a> is created
the attribute must be initialized to false.</p>

<p>The
<dfn id="dom-progressevent-loaded" title="dom-ProgressEvent-loaded"><code>loaded</code></dfn> and
<dfn id="dom-progressevent-total" title="dom-ProgressEvent-total"><code>total</code></dfn>
attributes must return the value they were initialized to. When an
<a class="external" href="http://dvcs.w3.org/hg/domcore/raw-file/tip/Overview.html#concept-event" title="concept-event">event</a> is created
the attributes must be initialized to 0.</p>


<h3 id="firing-events-using-the-progressevent-interface-for-http"><span class="secno">4.1 </span>Firing events using the <code title="">ProgressEvent</code> interface for HTTP</h3>

<p>To
<dfn id="concept-event-fire-progress" title="concept-event-fire-progress">fire a progress event named <var>e</var></dfn>
means to
<a class="external" href="http://dvcs.w3.org/hg/domcore/raw-file/tip/Overview.html#concept-event-fire" title="concept-event-fire">fire an event named <var>e</var></a>
with an <a class="external" href="http://dvcs.w3.org/hg/domcore/raw-file/tip/Overview.html#concept-event" title="concept-event">event</a>
using the <code><a href="#progressevent">ProgressEvent</a></code> interface that also meets these
conditions:

<ul>
 <li>Initialize the <code title="dom-ProgressEvent-loaded"><a href="#dom-progressevent-loaded">loaded</a></code>
 attribute to the number of HTTP
 <a class="external" href="http://tools.ietf.org/html/rfc2616/#section-7.2">entity body</a> octets transferred.
 <li>If the length of the HTTP
 <a class="external" href="http://tools.ietf.org/html/rfc2616/#section-7.2">entity body</a> is known through the
 <code class="external" title="http-content-length"><a href="http://tools.ietf.org/html/rfc2616/#section-14.13">Content-Length</a></code>
 header, initialize the
 <code title="dom-ProgressEvent-lengthComputable"><a href="#dom-progressevent-lengthcomputable">lengthComputable</a></code>
 attribute to true and initialize the
 <code title="dom-ProgressEvent-total"><a href="#dom-progressevent-total">total</a></code> attribute to the length.
</ul>

<p class="note">This definition can be used by other specifications. XMLHttpRequest does this for instance.
<a class="informative" href="#refsXHR">[XHR]</a>

<h3 id="firing-events-using-the-progressevent-interface-for-other-contexts"><span class="secno">4.2 </span>Firing events using the <code title="">ProgressEvent</code> interface for other contexts</h3>

<p>This is left as an exercise for the editor of the specification that
introduces such a context. The editor is encouraged to define it in a way
consistent with this and other specifications that utilize
<span title="concept-event">events</span> using the
<code><a href="#progressevent">ProgressEvent</a></code> interface.</p>


<h3 id="suggested-names-for-events-using-the-progressevent-interface"><span class="secno">4.3 </span>Suggested names for events using the <code title="">ProgressEvent</code> interface</h3>

  <p><em>This section is non-normative.</em></p>

  <p>The suggested
  <code class="external" title="dom-Event-type"><a href="http://dvcs.w3.org/hg/domcore/raw-file/tip/Overview.html#dom-event-type">type</a></code> attribute
  values for use with
  <a class="external" href="http://dvcs.w3.org/hg/domcore/raw-file/tip/Overview.html#concept-event" title="concept-event">events</a> using the
  <code><a href="#progressevent">ProgressEvent</a></code> interface are summarized in the table
  below. Specification editors are free to tune the details to their
  specific scenarios, though are strongly encouraged to discuss their usage
  with the W3C WebApps Working Group on
  <a href="mailto:public-webapps@w3.org">public-webapps@w3.org</a> to ensure
  input from people familiar with the subject.</p>

  <table>
   <tbody>
    <tr>
     <th><code class="external" title="dom-Event-type"><a href="http://dvcs.w3.org/hg/domcore/raw-file/tip/Overview.html#dom-event-type">type</a></code> attribute value
     <th>Description
     <th>Times
     <th>When
    <tr>
     <th><code title="">loadstart</code>
     <td>Progress has begun.
     <td>Once.
     <td>First.
    <tr>
     <th><code title="">progress</code>
     <td>In progress.
     <td>Zero or more.
     <td>After <code title="">loadstart</code> has been
     <a class="external" href="http://dvcs.w3.org/hg/domcore/raw-file/tip/Overview.html#concept-event-dispatch" title="concept-event-dispatch">dispatched</a>.
    <tr>
     <th><code title="">error</code>
     <td>Progression failed.
     <td>Zero or once.
     <td rowspan="3">After the last <code title="">progress</code> has
      been
      <a class="external" href="http://dvcs.w3.org/hg/domcore/raw-file/tip/Overview.html#concept-event-dispatch" title="concept-event-dispatch">dispatched</a>,
      or after
      <code title="">loadstart</code> has been
      <a class="external" href="http://dvcs.w3.org/hg/domcore/raw-file/tip/Overview.html#concept-event-dispatch" title="concept-event-dispatch">dispatched</a>
      if <code title="">progress</code> has not been
      <a class="external" href="http://dvcs.w3.org/hg/domcore/raw-file/tip/Overview.html#concept-event-dispatch" title="concept-event-dispatch">dispatched</a>.
    <tr>
     <th><code>abort</code>
     <td>Progression is terminated.
     <td>Zero or once.
    <tr>
     <th><code>load</code>
     <td>Progression is successful.
     <td>Zero or once.
    <tr>
     <th><code title="">loadend</code>
     <td>Progress has stopped.
     <td>Once.</td>
     <td>After one of <code title="">error</code>,
      <code title="">abort</code>, or <code title="">load</code> has been
      <a class="external" href="http://dvcs.w3.org/hg/domcore/raw-file/tip/Overview.html#concept-event-dispatch" title="concept-event-dispatch">dispatched</a>.
  </table>

  <p>The <code title="">error</code>, <code title="">abort</code>, and
  <code title="">load</code> event types are mutually exclusive.</p>

  <p>Throughout the web platform the <code title="">error</code>,
  <code title="">abort</code>, and <code title="">load</code> event types
  have their
  <code class="external" title="dom-Event-bubbles"><a href="http://dvcs.w3.org/hg/domcore/raw-file/tip/Overview.html#dom-event-bubbles">bubbles</a></code> and
  <code class="external" title="dom-Event-cancelable"><a href="http://dvcs.w3.org/hg/domcore/raw-file/tip/Overview.html#dom-event-cancelable">cancelable</a></code>
  attributes initialized to false, so it is suggested that for consistency
  all <a class="external" href="http://dvcs.w3.org/hg/domcore/raw-file/tip/Overview.html#concept-event" title="concept-event">events</a> using
  the <code><a href="#progressevent">ProgressEvent</a></code> interface do the same.</p>


<h3 id="security-considerations"><span class="secno">4.4 </span>Security Considerations</h3>

<p>For cross-origin requests some kind of opt-in, e.g.
Cross-Origin Resource Sharing, has to be used before
<a class="external" href="http://dvcs.w3.org/hg/domcore/raw-file/tip/Overview.html#concept-event" title="concept-event">events</a> using the
<code><a href="#progressevent">ProgressEvent</a></code> interface are
<a class="external" href="http://dvcs.w3.org/hg/domcore/raw-file/tip/Overview.html#concept-event-dispatch" title="concept-event-dispatch">dispatched</a>
as information (e.g. size) would be revealed that cannot be obtained
otherwise. <a class="informative" href="#refsCORS">[CORS]</a>


<h2 class="no-num" id="references">References</h2>
<h3 class="no-num" id="normative-references">Normative references</h3>
<div id="anolis-references-normative"><dl><dt id="refsDOM">[DOM]
<dd><cite><a href="http://dvcs.w3.org/hg/domcore/raw-file/tip/Overview.html">DOM4</a></cite>, Anne van Kesteren, Aryeh Gregor and Ms2ger. W3C.

<dt id="refsHTTP">[HTTP]
<dd><cite><a href="http://tools.ietf.org/html/rfc2616">Hypertext Transfer Protocol -- HTTP/1.1</a></cite>, Roy Fielding, James Gettys, Jeffrey Mogul et al.. IETF.

<dt id="refsRFC2119">[RFC2119]
<dd><cite><a href="http://tools.ietf.org/html/rfc2119">Key words for use in RFCs to Indicate Requirement Levels</a></cite>, Scott Bradner. IETF.

<dt id="refsWEBIDL">[WEBIDL]
<dd><cite><a href="http://dev.w3.org/2006/webapi/WebIDL/">Web IDL</a></cite>, Cameron McCormack. W3C.

</dl></div>

<h3 class="no-num" id="informative-references">Informative references</h3>
<div id="anolis-references-informative"><dl><dt id="refsCORS">[CORS]
<dd><cite><a href="http://dev.w3.org/2006/waf/access-control/">Cross-Origin Resource Sharing</a></cite>, Anne van Kesteren. W3C.

<dt id="refsHTML">[HTML]
<dd><cite><a href="http://dev.w3.org/html5/spec/">HTML5</a></cite>, Ian Hickson. W3C.

<dt id="refsXHR">[XHR]
<dd><cite><a href="http://dev.w3.org/2006/webapi/XMLHttpRequest-2/">XMLHttpRequest Level 2</a></cite>, Anne van Kesteren. W3C.

</dl></div>


  <h2 class="no-num" id="acknowledgments">Acknowledgments</h2>

  <p>The editor would like to thank

  Aaron Leventhal,
  Alan Schepers,
  Alex Danilo,
  Andrew Emmons,
  Andrew Shellshear,
  Andy Sledd,
  Arthur Barstow,
  Bj&ouml;rn H&ouml;hrmann,
  Boris Zbarsky,
  Cameron McCormack,
  Chris Lilley,
  Cyril Concolato,
  David H&aring;s&auml;ther,
  Doug Schepers,
  Ellen Siegel,
  Erik Dahlstr&ouml;m,
  Garrett Smith,
  Gorm Eriksen,
  Gottfried Zimmermann,
  Ian Hickson,
  Jean-Claude Duford,
  Jean-Yves Bitterlich,
  Jim Ley,
  Jo&atilde;o Eiras,
  Kartikaya Gupta,
  Lisa Seeman,
  Maciej Stachowiak,
  Marcos Caceres,
  Michael Antony Puls,
  Nandini Ramani,
  Olli Pettay,
  Philip J&auml;genstedt,
  Ralph Swick,
  Rich Schwerdtfeger,
  Robert Sayre,
  Robin Berjon,
  Simon Pieters,
  Suresh Chitturi, and
  Travis Leithead

  for their contributions to this specification.</p>

  <p>Special thanks to the SVG WG for drafting the original
  <code title="">ProgressEvent</code> interface as part of the
  <a href="http://www.w3.org/TR/2008/REC-SVGTiny12-20081222/svgudom.html">SVG Micro DOM</a>.</p>

  <p>Thanks also to all those who have helped to improve this specification
  by sending suggestions and corrections. (Please, keep bugging us with your
  issues!)</p>