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- Date: Thu, 03 May 2012 14:03:25 +0000
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</style><link charset="utf-8" type="text/css" rel="stylesheet" href="http://www.w3.org/StyleSheets/TR/W3C-CR"></head>
<body style="display: inherit;"><div class="head"><p><a href="http://www.w3.org/"><img src="http://www.w3.org/Icons/w3c_home" alt="W3C" height="48" width="72"></a></p><h1 class="title" id="title">Vibration API</h1><h2 id="w3c-candidate-recommendation-08-may-2012"><acronym title="World Wide Web Consortium">W3C</acronym> Candidate Recommendation 08 May 2012</h2><dl><dt>This version:</dt><dd><a href="http://www.w3.org/TR/2012/CR-vibration-20120508/">http://www.w3.org/TR/2012/CR-vibration-20120508/</a></dd><dt>Latest published version:</dt><dd><a href="http://www.w3.org/TR/vibration/">http://www.w3.org/TR/vibration/</a></dd><dt>Latest editor's draft:</dt><dd><a href="http://dev.w3.org/2009/dap/vibration/">http://dev.w3.org/2009/dap/vibration/</a></dd><dt>Previous version:</dt><dd><a href="http://www.w3.org/TR/2012/WD-vibration-20120202/">http://www.w3.org/TR/2012/WD-vibration-20120202/</a></dd><dt>Editor:</dt><dd><span>Anssi Kostiainen</span>, Nokia</dd>
</dl><p class="copyright"><a href="http://www.w3.org/Consortium/Legal/ipr-notice#Copyright">Copyright</a> © 2012 <a href="http://www.w3.org/"><acronym title="World Wide Web Consortium">W3C</acronym></a><sup>®</sup> (<a href="http://www.csail.mit.edu/"><acronym title="Massachusetts Institute of Technology">MIT</acronym></a>, <a href="http://www.ercim.eu/"><acronym title="European Research Consortium for Informatics and Mathematics">ERCIM</acronym></a>, <a href="http://www.keio.ac.jp/">Keio</a>), All Rights Reserved. <acronym title="World Wide Web Consortium">W3C</acronym> <a href="http://www.w3.org/Consortium/Legal/ipr-notice#Legal_Disclaimer">liability</a>, <a href="http://www.w3.org/Consortium/Legal/ipr-notice#W3C_Trademarks">trademark</a> and <a href="http://www.w3.org/Consortium/Legal/copyright-documents">document use</a> rules apply.</p><hr></div>
<div class="introductory section" id="abstract"><h2>Abstract</h2><p>
This specification defines an API that provides access to the vibration
mechanism of the hosting device. Vibration is a form of tactile feedback.
</p></div><div id="sotd" class="introductory section"><h2>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 <acronym title="World Wide Web Consortium">W3C</acronym> publications and the latest revision of this technical report can be found in the <a href="http://www.w3.org/TR/"><acronym title="World Wide Web Consortium">W3C</acronym> technical reports index</a> at http://www.w3.org/TR/.</em></p>
<p>
This document represents the consensus of the group on the scope and features of the
Vibration API. It should be noted that the group is aware of more advanced use cases that cannot
be realised using this simpler first version. The intent is to address them in a future revision.
</p>
<p>This document was published by the <a href="http://www.w3.org/2009/dap/">Device APIs Working Group</a> as a Candidate Recommendation. This document is intended to become a <acronym title="World Wide Web Consortium">W3C</acronym> Recommendation. If you wish to make comments regarding this document, please send them to <a href="mailto:public-device-apis@w3.org">public-device-apis@w3.org</a> (<a href="mailto:public-device-apis-request@w3.org?subject=subscribe">subscribe</a>, <a href="http://lists.w3.org/Archives/Public/public-device-apis/">archives</a>). <acronym title="World Wide Web Consortium">W3C</acronym> publishes a Candidate Recommendation to indicate that the document is believed to be stable and to encourage implementation by the developer community. This Candidate Recommendation is expected to advance to Proposed Recommendation no earlier than 01 July 2012. All feedback is welcome.</p><p>Publication as a Candidate Recommendation does not imply endorsement by the <acronym title="World Wide Web onsortium">W3C</acronym> 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><p>This document was produced by a group operating under the <a href="http://www.w3.org/Consortium/Patent-Policy-20040205/">5 February 2004 <acronym title="World Wide Web Consortium">W3C</acronym> Patent Policy</a>. <acronym title="World Wide Web Consortium">W3C</acronym> maintains a <a href="http://www.w3.org/2004/01/pp-impl/43696/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-0040205/#sec-Disclosure">section 6 of the <acronym title="World Wide Web Consortium">W3C</acronym> Patent Policy</a>.</p></div><div class="section" id="toc"><h2 class="introductory">Table of Contents</h2><ul class="toc"><li class="tocline"><a class="tocxref" href="#introduction"><span class="secno">1. </span>Introduction</a></li><li class="tocline"><a class="tocxref" href="#conformance"><span class="secno">2. </span>Conformance</a></li><li class="tocline"><a class="tocxref" href="#vibration-interface"><span class="secno">3. </span>Vibration Interface</a><ul class="toc"><li class="tocline"><a class="tocxref" href="#methods"><span class="secno">3.1 </span>Methods</a></li></ul></li><li class="tocline"><a class="tocxref" href="#examples"><span class="secno">4. </span>Examples</a></li><li class="tocline"><a class="tocxref" href="#acknowledgements"><span class="secno">A. </span>Acknowledgements</a></li><li class="tocline"><a class="tocxref" href="#references"><span class="secno">B. </span>References</a><ul class=toc"><li class="tocline"><a class="tocxref" href="#normative-references"><span class="secno">B.1 </span>Normative references</a></li><li class="tocline"><a class="tocxref" href="#informative-references"><span class="secno">B.2 </span>Informative references</a></li></ul></li></ul></div>
<div id="introduction" class="informative section">
<!--OddPage--><h2><span class="secno">1. </span>Introduction</h2><p><em>This section is non-normative.</em></p>
<p>
The Vibration API defines a means for web developers to
programmatically provide tactile feedback in the form of vibration. The
API is designed to tackle high-value use cases related to gaming, and
is not meant to be used as a generic notification mechanism.
</p>
</div>
<div class="section" id="conformance"><!--OddPage--><h2><span class="secno">2. </span>Conformance</h2><p>As well as sections marked as non-normative, all authoring guidelines, diagrams, examples, and notes in this specification are non-normative. Everything else in this specification is normative.</p>
<p>The key words <em title="must" class="rfc2119">must</em>, <em title="must not" class="rfc2119">must not</em>, <em title="required" class="rfc2119">required</em>, <em title="should" class="rfc2119">should</em>, <em title="should not" class="rfc2119">should not</em>, <em title="recommended" class="rfc2119">recommended</em>, <em title="may" class="rfc2119">may</em>, and <em title="optional" class="rfc2119">optional</em> in this specification are to be interpreted as described in [<cite><a href="#bib-RFC2119" rel="biblioentry" class="bibref">RFC2119</a></cite>].</p>
<p>
This specification defines conformance criteria that apply to a single
product: the <dfn id="ua">user agent</dfn> that implements the
interfaces that it contains.
</p>
<p>
Implementations that use ECMAScript to implement the APIs defined in
this specification must implement them in a manner consistent with the
ECMAScript Bindings defined in the Web IDL specification [<cite><a href="#bib-WEBIDL" rel="biblioentry" class="bibref">WEBIDL</a></cite>],
as this specification uses that specification and terminology.
</p>
</div>
<div class="section" id="vibration-interface">
<!--OddPage--><h2><span class="secno">3. </span>Vibration Interface</h2>
<pre class="idl"><span class="idlImplements"><a>Navigator</a> implements <a class="idlType" href="#idl-def-Vibration"><code>Vibration</code></a>;</span></pre><div class="idlImplementsDesc"><p>All instances of the <code><a>Navigator</a></code> type are defined to also implement the <a class="idlType" href="#idl-def-Vibration"><code>Vibration</code></a> interface.</p></div>
<pre class="idl"><span class="idlInterface" id="idl-def-Vibration">interface <span class="idlInterfaceID">Vibration</span> {
<span class="idlMethod"> <span class="idlMethType"><a>void</a></span> <span class="idlMethName"><a href="#widl-Vibration-vibrate-void-unsigned-long-time">vibrate</a></span> (<span class="idlParam"><span class="idlParamType"><a>unsigned long</a></span> <span class="idlParamName">time</span></span>);</span>
<span class="idlMethod"> <span class="idlMethType"><a>void</a></span> <span class="idlMethName"><a href="#widl-Vibration-vibrate-void-unsigned-longArray-pattern">vibrate</a></span> (<span class="idlParam"><span class="idlParamType"><a>unsigned long</a>[]</span> <span class="idlParamName">pattern</span></span>);</span>
};</span>
</pre><div class="section" id="methods"><h3><span class="secno">3.1 </span>Methods</h3><dl class="methods"><dt id="widl-Vibration-vibrate-void-unsigned-long-time"><code>vibrate</code></dt><dd>
<table class="parameters"><tr><th>Parameter</th><th>Type</th><th>Nullable</th><th>Optional</th><th>Description</th></tr><tr><td class="prmName">time</td><td class="prmType"><code><a>unsigned long</a></code></td><td class="prmNullFalse">✘</td><td class="prmOptFalse">✘</td><td class="prmDesc">
Vibration time in milliseconds.
</td></tr></table><div><em>Return type: </em><code><a>void</a></code></div></dd><dt id="widl-Vibration-vibrate-void-unsigned-longArray-pattern"><code>vibrate</code></dt><dd>
<table class="parameters"><tr><th>Parameter</th><th>Type</th><th>Nullable</th><th>Optional</th><th>Description</th></tr><tr><td class="prmName">pattern</td><td class="prmType"><code><a>unsigned long</a>[]</code></td><td class="prmNullFalse">✘</td><td class="prmOptFalse">✘</td><td class="prmDesc">
A vibration pattern represented by a list of time entries.
Odd entries represent vibration time in milliseconds, even
entries still periods in milliseconds between the vibrations.
</td></tr></table><div><em>Return type: </em><code><a>void</a></code></div></dd></dl></div>
<p>
The <code>vibrate()</code> method, when invoked, <em title="must" class="rfc2119">must</em> run the algorithm
for <a class="internalDFN" href="#dfn-processing-vibration-patterns">processing vibration patterns</a>.
</p>
<p>
The rules for <dfn id="dfn-processing-vibration-patterns">processing vibration patterns</dfn> are as given in
the following algorithm:
</p>
<ol>
<!--li>
If the <var>already started</var> flag is set to true, the
<a class="product-ua" href="#ua">user agent</a> MUST cancel the
pre-existing instance of the <a>processing vibration patterns</a>
algorithm, if any.
</li-->
<li>
If the <code>
<a href="http://dvcs.w3.org/hg/webperf/raw-file/tip/specs/PageVisibility/Overview.html#pv-hidden">
hidden</a></code> attribute [<cite><a href="#bib-PAGE-VISIBILITY" rel="biblioentry" class="bibref">PAGE-VISIBILITY</a></cite>] is set to true,
abort these steps.
</li>
<!--li>
Let <var>already started</var> flag be true.
</li-->
<li>
Let <var>pattern</var> be the value of the first argument.
</li>
<li>
If <var>pattern</var> is 0, or an empty list, cancel the pre-existing
instance of the <a class="internalDFN" href="#dfn-processing-vibration-patterns">processing vibration patterns</a> algorithm, if
any, and abort these steps.
</li>
<li>
If <var>pattern</var> is a list, proceed to the next step.
Otherwise run the following substeps:
<ol>
<li>
Let <var>list</var> be an initially empty list, and add
<var>pattern</var> to <var>list</var>.
</li>
<li>
Let <var>pattern</var> be <var>list</var>.
</li>
</ol>
</li>
<li>
If any entry of <var>pattern</var> exceeds an
implementation-dependent limit, then the
<a class="product-ua" href="#ua">user agent</a> <em title="may" class="rfc2119">may</em> throw a
<code>NotSupportedError</code> exception [<cite><a href="#bib-DOM4" rel="biblioentry" class="bibref">DOM4</a></cite>] and abort these
steps.
</li>
<li>
If the length of <var>pattern</var> is even, then remove the last
entry in <var>pattern</var>.
</li>
<li>
If the length of <var>pattern</var> exceeds an implementation
dependent limit, the <a class="product-ua" href="#ua">user agent</a>
<em title="may" class="rfc2119">may</em> throw a <code>NotSupportedError</code> exception [<cite><a href="#bib-DOM4" rel="biblioentry" class="bibref">DOM4</a></cite>] and
abort these steps.
</li>
<li>
Cancel the pre-existing instance of the <a class="internalDFN" href="#dfn-processing-vibration-patterns">processing vibration
patterns</a> algorithm, if any.
</li>
<li>
An implementation <em title="may" class="rfc2119">may</em> abort the algorithm at this point.
<div class="note">
For example, an implementation might abort the
algorithm because the user has set a preference indicating that
pages at a given origin should never be able to vibrate the device,
or an implementation might cap the total amount of time a page may
cause the device to vibrate and reject requests in excess of this
limit.
</div>
</li>
<li>
For each <var>time</var> in <var>pattern</var>, run the following
substeps:
<ol>
<li>
If the index of <var>time</var> is even (the earliest even entry
has index 0), vibrate the device for <var>time</var>
milliseconds.
</li>
<li>
Otherwise
<a href="http://dev.w3.org/html5/spec/webappapis.html#pause">
pause</a> [<cite><a href="#bib-HTML5" rel="biblioentry" class="bibref">HTML5</a></cite>] for <var>time</var> milliseconds.
</li>
</ol>
</li>
</ol>
<p>
When the
<code><a href="http://dvcs.w3.org/hg/webperf/raw-file/tip/specs/PageVisibility/Overview.html#sec-visibilitychange-event">
visibilitychange</a></code> event [<cite><a href="#bib-PAGE-VISIBILITY" rel="biblioentry" class="bibref">PAGE-VISIBILITY</a></cite>] is dispatched at
the <code>Document</code>, the <a class="product-ua" href="#ua">user
agent</a> <em title="must" class="rfc2119">must</em> run the following steps:
</p>
<ol>
<li>
If the <code><a href="http://dvcs.w3.org/hg/webperf/raw-file/tip/specs/PageVisibility/Overview.html#pv-hidden">
hidden</a></code> attribute [<cite><a href="#bib-PAGE-VISIBILITY" rel="biblioentry" class="bibref">PAGE-VISIBILITY</a></cite>] is set to true,
the <a class="product-ua" href="#ua">user agent</a> <em title="must" class="rfc2119">must</em> suppress
the vibration produced by running the pre-existing instance of the
<a class="internalDFN" href="#dfn-processing-vibration-patterns">processing vibration patterns</a> algorithm, if any.
</li>
<li>
If the <code><a href="http://dvcs.w3.org/hg/webperf/raw-file/tip/specs/PageVisibility/Overview.html#pv-hidden">
hidden</a></code> attribute [<cite><a href="#bib-PAGE-VISIBILITY" rel="biblioentry" class="bibref">PAGE-VISIBILITY</a></cite>] is set to false,
the <a class="product-ua" href="#ua">user agent</a> <em title="must" class="rfc2119">must</em> restore
the vibration produced by running the pre-existing instance of the <a class="internalDFN" href="#dfn-processing-vibration-patterns">processing vibration
patterns</a> algorithm, if any.
</li>
</ol>
<p>
If the device does not provide a vibration mechanism, or it is
disabled, the <a class="product-ua" href="#ua">user agent</a> <em title="must" class="rfc2119">must</em>
silently ignore any invocations of the <code>vibrate()</code> method.
</p>
</div>
<div id="examples" class="informative section">
<!--OddPage--><h2><span class="secno">4. </span>Examples</h2><p><em>This section is non-normative.</em></p>
<p>
In the following example the device vibrates for 1 second:
</p><div class="example">
<pre class="example sh_javascript sh_sourceCode"><span class="sh_comment">// vibrate for 1 second</span>
navigator<span class="sh_symbol">.</span><span class="sh_function">vibrate</span><span class="sh_symbol">(</span><span class="sh_number">1000</span><span class="sh_symbol">);</span>
<span class="sh_comment">// or alternatively</span>
navigator<span class="sh_symbol">.</span><span class="sh_function">vibrate</span><span class="sh_symbol">([</span><span class="sh_number">1000</span><span class="sh_symbol">]);</span></pre>
</div>
<p>
In the following example the device vibrates for 1 second, is still for
0.5 seconds, and vibrates again for 2 seconds:
</p>
<div class="example">
<pre class="example sh_javascript sh_sourceCode">navigator<span class="sh_symbol">.</span><span class="sh_function">vibrate</span><span class="sh_symbol">([</span><span class="sh_number">1000</span><span class="sh_symbol">,</span> <span class="sh_number">500</span><span class="sh_symbol">,</span> <span class="sh_number">2000</span><span class="sh_symbol">]);</span></pre>
</div>
<p>
</p><p>
The following example cancels any existing vibrations:
</p>
<div class="example">
<pre class="example sh_javascript sh_sourceCode">navigator<span class="sh_symbol">.</span><span class="sh_function">vibrate</span><span class="sh_symbol">(</span><span class="sh_number">0</span><span class="sh_symbol">);</span>
<span class="sh_comment">// or alternatively</span>
navigator<span class="sh_symbol">.</span><span class="sh_function">vibrate</span><span class="sh_symbol">([]);</span></pre>
</div>
</div>
<div id="acknowledgements" class="appendix section">
<!--OddPage--><h2><span class="secno">A. </span>Acknowledgements</h2>
<p>
The group is deeply indebted to Mounir Lamouri, Jonas Sicking, and
the Mozilla WebAPI team in general for providing the WebVibrator
prototype as an initial input.
</p>
</div>
<div class="appendix section" id="references"><!--OddPage--><h2><span class="secno">B. </span>References</h2><div class="section" id="normative-references"><h3><span class="secno">B.1 </span>Normative references</h3><dl class="bibliography"><dt id="bib-DOM4">[DOM4]</dt><dd>Anne van Kesteren; Aryeh Gregor; Ms2ger. <a href="http://www.w3.org/TR/2012/WD-dom-20120105/"><cite>DOM4.</cite></a> 5 January 2012. W3C Working Draft. (Work in progress.) URL: <a href="http://www.w3.org/TR/2012/WD-dom-20120105/">http://www.w3.org/TR/2012/WD-dom-20120105/</a>
</dd><dt id="bib-HTML5">[HTML5]</dt><dd>Ian Hickson; David Hyatt. <a href="http://www.w3.org/TR/html5"><cite>HTML5.</cite></a> 25 May 2011. W3C Working Draft. (Work in progress.) URL: <a href="http://www.w3.org/TR/html5">http://www.w3.org/TR/html5</a>
</dd><dt id="bib-PAGE-VISIBILITY">[PAGE-VISIBILITY]</dt><dd>J. Mann; A. Jain. <a href="http://dvcs.w3.org/hg/webperf/raw-file/tip/specs/PageVisibility/Overview.html"><cite>Page Visibility</cite></a>. 26 September 2011. W3C Editor's Draft. (Work in progress.) URL: <a href="http://dvcs.w3.org/hg/webperf/raw-file/tip/specs/PageVisibility/Overview.html">http://dvcs.w3.org/hg/webperf/raw-file/tip/specs/PageVisibility/Overview.html</a>
</dd><dt id="bib-RFC2119">[RFC2119]</dt><dd>S. Bradner. <a href="http://www.ietf.org/rfc/rfc2119.txt"><cite>Key words for use in RFCs to Indicate Requirement Levels.</cite></a> March 1997. Internet RFC 2119. URL: <a href="http://www.ietf.org/rfc/rfc2119.txt">http://www.ietf.org/rfc/rfc2119.txt</a>
</dd><dt id="bib-WEBIDL">[WEBIDL]</dt><dd>Cameron McCormack. <a href="http://www.w3.org/TR/2011/WD-WebIDL-20110927/"><cite>Web IDL.</cite></a> 27 September 2011. W3C Working Draft. (Work in progress.) URL: <a href="http://www.w3.org/TR/2011/WD-WebIDL-20110927/">http://www.w3.org/TR/2011/WD-WebIDL-20110927/</a>
</dd></dl></div><div class="section" id="informative-references"><h3><span class="secno">B.2 </span>Informative references</h3><p>No informative references.</p></div></div></body></html>
Received on Thursday, 3 May 2012 14:03:37 UTC