- From: Mercurial notifier <cvsmail@w3.org>
- Date: Fri, 14 Nov 2014 15:59:22 +0000
- To: public-dap-commits@w3.org
changeset: 584:587f69a20dc6
tag: tip
user: Anssi Kostiainen <anssi.kostiainen@intel.com>
date: Fri Nov 14 17:59:09 2014 +0200
files: battery/CR2.html
description:
CR2 snapshot for TranReq.
diff -r ad52df58c238 -r 587f69a20dc6 battery/CR2.html
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/battery/CR2.html Fri Nov 14 17:59:09 2014 +0200
@@ -0,0 +1,1020 @@
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+</style><link rel="stylesheet" href="https://www.w3.org/StyleSheets/TR/W3C-CR"><!--[if lt IE 9]><script src='https://www.w3.org/2008/site/js/html5shiv.js'></script><![endif]--></head>
+ <body class="h-entry" role="document" id="respecDocument"><div class="head" role="contentinfo" id="respecHeader">
+ <p>
+
+
+ <a href="http://www.w3.org/"><img width="72" height="48" src="https://www.w3.org/Icons/w3c_home" alt="W3C"></a>
+
+
+ </p>
+ <h1 class="title p-name" id="title" property="dcterms:title">Battery Status API</h1>
+
+ <h2 property="dcterms:issued" datatype="xsd:dateTime" content="2014-12-08T22:00:00.000Z" id="w3c-candidate-recommendation-09-december-2014"><abbr title="World Wide Web Consortium">W3C</abbr> Candidate Recommendation <time class="dt-published" datetime="2014-12-09">09 December 2014</time></h2>
+ <dl>
+
+ <dt>This version:</dt>
+ <dd><a class="u-url" href="http://www.w3.org/TR/2014/CR-battery-status-20141209/">http://www.w3.org/TR/2014/CR-battery-status-20141209/</a></dd>
+ <dt>Latest published version:</dt>
+ <dd><a href="http://www.w3.org/TR/battery-status/">http://www.w3.org/TR/battery-status/</a></dd>
+
+
+ <dt>Latest editor's draft:</dt>
+ <dd><a href="http://dvcs.w3.org/hg/dap/raw-file/default/battery/Overview.html">http://dvcs.w3.org/hg/dap/raw-file/default/battery/Overview.html</a></dd>
+
+
+ <dt>Test suite:</dt>
+ <dd><a href="http://w3c-test.org/battery-status/">http://w3c-test.org/battery-status/</a></dd>
+
+
+ <dt>Implementation report:</dt>
+ <dd><a href="http://www.w3.org/2009/dap/wiki/ImplementationStatus">http://www.w3.org/2009/dap/wiki/ImplementationStatus</a></dd>
+
+
+
+
+ <dt>Previous version:</dt>
+ <dd><a rel="dcterms:replaces" href="http://www.w3.org/TR/2014/WD-battery-status-20140828/">http://www.w3.org/TR/2014/WD-battery-status-20140828/</a></dd>
+
+
+ <dt>Editors:</dt>
+ <dd class="p-author h-card vcard" rel="bibo:editor" inlist=""><span typeof="foaf:Person"><span property="foaf:name" class="p-name fn">Anssi Kostiainen</span>, <a rel="foaf:workplaceHomepage" class="p-org org h-org h-card" href="http://intel.com/">Intel</a></span>
+</dd>
+<dd class="p-author h-card vcard" rel="bibo:editor" inlist=""><span typeof="foaf:Person"><span property="foaf:name" class="p-name fn">Mounir Lamouri</span>, <a rel="foaf:workplaceHomepage" class="p-org org h-org h-card" href="http://google.com/">Google Inc.</a> (previously Mozilla)</span>
+</dd>
+
+
+
+ </dl>
+
+
+
+
+
+ <p class="copyright">
+ <a href="http://www.w3.org/Consortium/Legal/ipr-notice#Copyright">Copyright</a> ©
+ 2014
+
+ <a href="http://www.w3.org/"><abbr title="World Wide Web Consortium">W3C</abbr></a><sup>®</sup>
+ (<a href="http://www.csail.mit.edu/"><abbr title="Massachusetts Institute of Technology">MIT</abbr></a>,
+ <a href="http://www.ercim.eu/"><abbr title="European Research Consortium for Informatics and Mathematics">ERCIM</abbr></a>,
+ <a href="http://www.keio.ac.jp/">Keio</a>, <a href="http://ev.buaa.edu.cn/">Beihang</a>),
+
+ All Rights Reserved.
+
+ <abbr title="World Wide Web Consortium">W3C</abbr> <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>
+ <section id="abstract" class="introductory" property="dcterms:abstract" datatype="" typeof="bibo:Chapter" resource="#abstract" rel="bibo:Chapter"><h2 role="heading" id="h2_abstract">Abstract</h2><p>
+ This specification defines an API that provides information about the
+ battery status of the hosting device.
+ </p></section><section id="sotd" class="introductory" typeof="bibo:Chapter" resource="#sotd" rel="bibo:Chapter"><h2 role="heading" id="h2_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 <abbr title="World Wide Web Consortium">W3C</abbr> publications and the
+ latest revision of this technical report can be found in the <a href="http://www.w3.org/TR/"><abbr title="World Wide Web Consortium">W3C</abbr> technical reports index</a> at
+ http://www.w3.org/TR/.</em>
+ </p>
+
+ <p>
+ The functionality described in this specification was initially
+ specified as part of the
+ <a href="http://www.w3.org/TR/system-info-api/">System Information
+ API</a> but has been extracted in order to be more readily available,
+ more straightforward to implement, and in order to produce a
+ specification that could be implemented on its own merits without
+ interference with other, often unrelated, features.
+ </p>
+ <p>
+ No substantial changes have been made since the
+ <a href="http://www.w3.org/TR/2014/WD-battery-status-20140828/">
+ <abbr title="World Wide Web Consortium">W3C</abbr> Last Call Working Draft 28 August 2014</a>
+ (<a href="CR2-diff.html">diff</a>).
+ </p>
+ <p>
+ The CR exit criterion is two interoperable deployed implementations of
+ each feature. No features are marked as 'at-risk'.
+ </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 <abbr title="World Wide Web Consortium">W3C</abbr> 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>).
+
+
+
+ <abbr title="World Wide Web Consortium">W3C</abbr> 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
+ 03 February 2015.
+
+
+ All comments are welcome.
+
+ </p>
+
+ <p>
+ Please see the Working Group's <a href="http://www.w3.org/2009/dap/wiki/ImplementationStatus">implementation
+ report</a>.
+ </p>
+
+
+ <p>
+ Publication as a Candidate Recommendation does not imply endorsement by the <abbr title="World Wide Web Consortium">W3C</abbr>
+ 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 id="sotd_patent" about="" rel="w3p:patentRules" href="http://www.w3.org/Consortium/Patent-Policy-20040205/">5 February 2004 <abbr title="World Wide Web Consortium">W3C</abbr> Patent
+ Policy</a>.
+
+
+
+
+ <abbr title="World Wide Web Consortium">W3C</abbr> 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-20040205/#sec-Disclosure">section
+ 6 of the <abbr title="World Wide Web Consortium">W3C</abbr> Patent Policy</a>.
+
+
+ </p>
+
+ <p>
+ This document is governed by the <a id="w3c_process_revision" href="http://www.w3.org/2005/10/Process-20051014/">14 October 2005 <abbr title="World Wide Web Consortium">W3C</abbr> Process Document</a>.
+ </p>
+
+
+
+
+
+</section><section id="toc"><h2 class="introductory" role="heading" id="h2_toc">Table of Contents</h2><ul class="toc" role="directory" id="respecContents"><li class="tocline"><a href="#introduction" class="tocxref"><span class="secno">1. </span>Introduction</a></li><li class="tocline"><a href="#conformance" class="tocxref"><span class="secno">2. </span>Conformance</a></li><li class="tocline"><a href="#terminology" class="tocxref"><span class="secno">3. </span>Terminology</a></li><li class="tocline"><a href="#security-and-privacy-considerations" class="tocxref"><span class="secno">4. </span>Security and privacy considerations</a></li><li class="tocline"><a href="#the-navigator-interface" class="tocxref"><span class="secno">5. </span>The <span class="formerLink"><code>Navigator</code></span> interface</a></li><li class="tocline"><a href="#the-batterymanager-interface" class="tocxref"><span class="secno">6. </span>The <span class="formerLink"><code>BatteryManager</code></span> interface</a><ul class="toc"><liclass="tocline"><a href="#multiple-batteries" class="tocxref"><span class="secno">6.1 </span>Multiple batteries</a></li><li class="tocline"><a href="#event-handlers" class="tocxref"><span class="secno">6.2 </span>Event handlers</a></li></ul></li><li class="tocline"><a href="#examples" class="tocxref"><span class="secno">7. </span>Examples</a></li><li class="tocline"><a href="#acknowledgements" class="tocxref"><span class="secno">A. </span>Acknowledgements</a></li><li class="tocline"><a href="#references" class="tocxref"><span class="secno">B. </span>References</a><ul class="toc"><li class="tocline"><a href="#normative-references" class="tocxref"><span class="secno">B.1 </span>Normative references</a></li></ul></li></ul></section>
+
+
+
+ <section class="informative" id="introduction">
+ <!--OddPage--><h2 role="heading" id="h2_introduction"><span class="secno">1. </span>Introduction</h2><p><em>This section is non-normative.</em></p>
+ <p>
+ The Battery Status API specification defines a means for web
+ developers to programmatically determine the battery status of the
+ hosting device. Without knowing the battery status of a device, a web
+ developer must design the web application with an assumption of
+ sufficient battery level for the task at hand. This means the battery
+ of a device may exhaust faster than desired because web developers are
+ unable to make decisions based on the battery status. Given knowledge
+ of the battery status, web developers are able to craft web content and
+ applications which are power-efficient, thereby leading to improved
+ user experience. Authors should be aware, however, that a naïve
+ implementation of this API can negatively affect the battery life.
+ </p>
+ <p>
+ The Battery Status API can be used to defer or scale back work when
+ the device is not charging in or is low on battery. An archetype of an
+ advanced web application, a web-based email client, may check the
+ server for new email every few seconds if the device is charging,
+ but do so less frequently if the device is not charging or is low on
+ battery. Another example is a web-based word processor which could
+ monitor the battery level and save changes before the battery runs
+ out to prevent data loss.
+ </p>
+ </section>
+
+ <section id="conformance" typeof="bibo:Chapter" resource="#conformance" rel="bibo:Chapter"><!--OddPage--><h2 role="heading" id="h2_conformance"><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 id="respecRFC2119">The key words <em class="rfc2119" title="MUST">MUST</em>, <em class="rfc2119" title="MUST NOT">MUST NOT</em>, and <em class="rfc2119" title="SHOULD">SHOULD</em> are
+ to be interpreted as described in [<cite><a class="bibref" href="#bib-RFC2119">RFC2119</a></cite>].
+</p>
+
+ <p>
+ This specification defines conformance criteria that apply to a single
+ product: the <dfn id="dfn-user-agent">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 class="bibref" href="#bib-WEBIDL">WEBIDL</a></cite>],
+ as this specification uses that specification and terminology.
+ </p>
+ </section>
+ <section id="terminology">
+ <!--OddPage--><h2 role="heading" id="h2_terminology"><span class="secno">3. </span>Terminology</h2>
+ <p>
+ The following concepts, terms and interfaces are defined in [<cite><a class="bibref" href="#bib-HTML5">HTML5</a></cite>]:
+ </p>
+ <ul>
+ <li><code><a href="http://www.w3.org/html/wg/drafts/html/master/webappapis.html#navigator">
+ Navigator</a></code></li>
+ <li><code><a href="http://dev.w3.org/html5/spec/webappapis.html#eventhandler">
+ EventHandler</a></code></li>
+ <li><dfn id="dfn-queue-a-task"><a href="http://dev.w3.org/html5/spec/webappapis.html#queue-a-task">
+ queue a task</a></dfn></li>
+ <li><dfn id="dfn-fires-a-simple-event"><a href="http://dev.w3.org/html5/spec/webappapis.html#fire-a-simple-event">
+ fires a simple event</a></dfn></li>
+ <li><dfn id="dfn-event-handlers"><a href="http://dev.w3.org/html5/spec/webappapis.html#event-handlers">
+ event handlers</a></dfn></li>
+ <li><dfn id="dfn-event-handler-event-types"><a href="http://dev.w3.org/html5/spec/webappapis.html#event-handler-event-type">
+ event handler event types</a></dfn></li>
+ <li><dfn id="dfn-browsing-context"><a href="http://dev.w3.org/html5/spec/browsers.html#browsing-context">
+ browsing context</a></dfn></li>
+ </ul>
+ <p>
+ <a href="http://people.mozilla.org/~jorendorff/es6-draft.html#sec-promise-objects">
+ <dfn id="dfn-promise">Promise</dfn></a> objects are defined in [<cite><a class="bibref" href="#bib-ECMASCRIPT">ECMASCRIPT</a></cite>].
+ </p>
+ </section>
+ <section class="informative" id="security-and-privacy-considerations">
+ <!--OddPage--><h2 role="heading" id="h2_security-and-privacy-considerations"><span class="secno">4. </span>Security and privacy considerations</h2><p><em>This section is non-normative.</em></p>
+ <p>
+ The API defined in this specification is used to determine the battery
+ status of the hosting device. The information disclosed has minimal
+ impact on privacy or fingerprinting, and therefore is exposed without
+ permission grants. For example, the user agent can obfuscate the
+ exposed value in a way that authors cannot directly know if a hosting
+ device has no battery, is charging or is exposing fake values.
+ </p>
+ </section>
+ <section id="the-navigator-interface">
+ <!--OddPage--><h2 role="heading" id="h2_the-navigator-interface"><span class="secno">5. </span>The <a href="#idl-def-Navigator" class="idlType"><code>Navigator</code></a> interface</h2>
+ <pre class="idl"><span class="idlInterface" id="idl-def-Navigator">partial interface <span class="idlInterfaceID">Navigator</span> {
+<span class="idlMethod"> <span class="idlMethType">Promise<<a href="#idl-def-BatteryManager" class="idlType"><code>BatteryManager</code></a>></span> <span class="idlMethName"><a href="#widl-Navigator-getBattery-Promise-BatteryManager">getBattery</a></span> ();</span>
+};</span></pre>
+ <p>
+ For each <a href="#dfn-browsing-context" class="internalDFN">browsing context</a>, there is a <dfn id="dfn-battery-promise">battery promise</dfn>,
+ which is initially set to <code>null</code>. It is a <a href="#dfn-promise" class="internalDFN">Promise</a>
+ object which holds a <a href="#idl-def-BatteryManager" class="idlType"><code>BatteryManager</code></a>.
+ </p>
+ <p>
+ The <code id="widl-Navigator-getBattery-Promise-BatteryManager">getBattery()</code>
+ method, when invoked, <em class="rfc2119" title="MUST">MUST</em> run the following steps:
+ </p>
+ <ul>
+ <li>
+ If <a href="#dfn-battery-promise" class="internalDFN">battery promise</a> is not <code>null</code>, return <a href="#dfn-battery-promise" class="internalDFN">battery
+ promise</a> and abort these steps.
+ </li>
+ <li>
+ Otherwise, set <a href="#dfn-battery-promise" class="internalDFN">battery promise</a> to a newly created
+ <a href="#dfn-promise" class="internalDFN">Promise</a>.
+ </li>
+ <li>
+ Return <a href="#dfn-battery-promise" class="internalDFN">battery promise</a> and continue asynchronously.
+ </li>
+ <li>
+ <a href="#dfn-create-a-new-batterymanager-object" class="internalDFN">Create a new <code>BatteryManager</code> object</a>,
+ and let <var>battery</var> be that object.
+ </li>
+ <li>
+ <dfn id="dfn-resolve">Resolve</dfn> <a href="#dfn-battery-promise" class="internalDFN">battery promise</a> with <var>battery</var>.
+ </li>
+ </ul>
+ <p>
+ The <a href="#dfn-user-agent" class="internalDFN">user agent</a> <em class="rfc2119" title="MUST NOT">MUST NOT</em> reject the <a href="#dfn-battery-promise" class="internalDFN">battery promise</a>.
+ </p>
+ </section>
+
+ <section id="the-batterymanager-interface">
+ <!--OddPage--><h2 role="heading" id="h2_the-batterymanager-interface"><span class="secno">6. </span>The <a href="#idl-def-BatteryManager" class="idlType"><code>BatteryManager</code></a> interface</h2>
+ <p>
+ The <a href="#idl-def-BatteryManager" class="idlType"><code>BatteryManager</code></a> interface represents the <dfn id="dfn-current-battery-status-information">current battery
+ status information</dfn> of the hosting device. The <code>charging</code>
+ attribute represents the charging state of the system's battery.
+ The <code>chargingTime</code> attribute represents the time remaining
+ in seconds until the system's battery is fully charged. The
+ <code>dischargingTime</code> attribute represents the time remaining in
+ seconds until the system's battery is completely discharged and the
+ system is about to be suspended, and the <code>level</code> attribute
+ represents the level of the system's battery.
+ </p>
+ <pre class="idl"><span class="idlInterface" id="idl-def-BatteryManager">interface <span class="idlInterfaceID">BatteryManager</span> : <span class="idlSuperclass">EventTarget</span> {
+<span class="idlAttribute"> readonly attribute <span class="idlAttrType">boolean</span> <span class="idlAttrName"><a href="#widl-BatteryManager-charging">charging</a></span>;</span>
+<span class="idlAttribute"> readonly attribute <span class="idlAttrType">unrestricted double</span> <span class="idlAttrName"><a href="#widl-BatteryManager-chargingTime">chargingTime</a></span>;</span>
+<span class="idlAttribute"> readonly attribute <span class="idlAttrType">unrestricted double</span> <span class="idlAttrName"><a href="#widl-BatteryManager-dischargingTime">dischargingTime</a></span>;</span>
+<span class="idlAttribute"> readonly attribute <span class="idlAttrType">double</span> <span class="idlAttrName"><a href="#widl-BatteryManager-level">level</a></span>;</span>
+<span class="idlAttribute"> attribute <span class="idlAttrType">EventHandler</span> <span class="idlAttrName"><a href="#widl-BatteryManager-onchargingchange">onchargingchange</a></span>;</span>
+<span class="idlAttribute"> attribute <span class="idlAttrType">EventHandler</span> <span class="idlAttrName"><a href="#widl-BatteryManager-onchargingtimechange">onchargingtimechange</a></span>;</span>
+<span class="idlAttribute"> attribute <span class="idlAttrType">EventHandler</span> <span class="idlAttrName"><a href="#widl-BatteryManager-ondischargingtimechange">ondischargingtimechange</a></span>;</span>
+<span class="idlAttribute"> attribute <span class="idlAttrType">EventHandler</span> <span class="idlAttrName"><a href="#widl-BatteryManager-onlevelchange">onlevelchange</a></span>;</span>
+};</span></pre>
+ <p>
+ When the <a href="#dfn-user-agent" class="internalDFN">user agent</a> is to <dfn id="dfn-create-a-new-batterymanager-object">create a new
+ <code>BatteryManager</code> object</dfn>, it <em class="rfc2119" title="MUST">MUST</em> instantiate a new
+ <a href="#idl-def-BatteryManager" class="idlType"><code>BatteryManager</code></a> object and set its attributes' values to those
+ that represent the <a href="#dfn-current-battery-status-information" class="internalDFN">current battery status information</a>, unless
+ the <a href="#dfn-user-agent" class="internalDFN">user agent</a> is <a href="#dfn-unable-to-report-the-battery-status-information" class="internalDFN">unable to report the battery status
+ information</a>, in which case the values <em class="rfc2119" title="MUST">MUST</em> be set to <dfn id="dfn-default-values">default
+ values</dfn> as follows:
+ <code>charging</code> <em class="rfc2119" title="MUST">MUST</em> be set to true,
+ <code>chargingTime</code> <em class="rfc2119" title="MUST">MUST</em> be set to 0,
+ <code>dischargingTime</code> <em class="rfc2119" title="MUST">MUST</em> be set to positive Infinity, and
+ <code>level</code> <em class="rfc2119" title="MUST">MUST</em> be set to 1.0.
+ </p>
+ <p>
+ The <a href="#dfn-user-agent" class="internalDFN">user agent</a> is said to be <dfn id="dfn-unable-to-report-the-battery-status-information">unable to report the
+ battery status information</dfn>, if it is not able to report the
+ values for any of the attributes, for example, due to a user or system
+ preference, setting, or limitation.
+ </p>
+ <div class="note"><div class="note-title" aria-level="1" role="heading" id="h_note_1"><span>Note</span></div><p class="">
+ Implementations <a href="#dfn-unable-to-report-the-battery-status-information" class="internalDFN">unable to report the battery status information</a>
+ emulate a fully charged and plugged in battery to reduce the potential
+ for fingerprinting and prevent applications from degrading performance,
+ if the battery status information is not made available, for example.
+ </p></div>
+ <p>
+ The <code id="widl-BatteryManager-charging">charging</code>
+ attribute <em class="rfc2119" title="MUST">MUST</em> be set to false if the battery
+ is discharging, and set to true, if the battery is charging, the
+ implementation is unable to report the state, or there is no battery
+ attached to the system, or otherwise. When the battery charging state
+ is updated, the <a href="#dfn-user-agent" class="internalDFN">user agent</a> <em class="rfc2119" title="MUST">MUST</em> <a href="#dfn-queue-a-task" class="internalDFN">queue a task</a> which sets
+ the <code>charging</code> attribute's value and <a href="#dfn-fires-a-simple-event" class="internalDFN">fires a simple
+ event</a> named <code><a href="#dfn-chargingchange" class="internalDFN">chargingchange</a></code> at the
+ <a href="#idl-def-BatteryManager" class="idlType"><code>BatteryManager</code></a> object.
+ </p>
+ <p>
+ The <code id="widl-BatteryManager-chargingTime">chargingTime</code>
+ attribute <em class="rfc2119" title="MUST">MUST</em> be set to 0, if the
+ battery is full or there is no battery attached to the system, and to
+ the value positive Infinity if the battery is discharging, the
+ implementation is unable to report the remaining charging time, or
+ otherwise. When the battery charging time is updated, the <a href="#dfn-user-agent" class="internalDFN">user
+ agent</a> <em class="rfc2119" title="MUST">MUST</em> <a href="#dfn-queue-a-task" class="internalDFN">queue a task</a> which sets the
+ <code>chargingTime</code> attribute's value and <a href="#dfn-fires-a-simple-event" class="internalDFN">fires a simple
+ event</a> named <code><a href="#dfn-chargingtimechange" class="internalDFN">chargingtimechange</a></code> at the
+ <a href="#idl-def-BatteryManager" class="idlType"><code>BatteryManager</code></a> object.
+ </p>
+ <p>
+ The <code id="widl-BatteryManager-dischargingTime">dischargingTime</code>
+ attribute <em class="rfc2119" title="MUST">MUST</em> be set to the value
+ positive Infinity, if the battery is charging, the implementation is
+ unable to report the remaining discharging time, there is no battery
+ attached to the system, or otherwise. When the battery discharging time
+ is updated, the <a href="#dfn-user-agent" class="internalDFN">user agent</a> <em class="rfc2119" title="MUST">MUST</em> <a href="#dfn-queue-a-task" class="internalDFN">queue a task</a> which sets
+ the <code>dischargingTime</code> attribute's value and <a href="#dfn-fires-a-simple-event" class="internalDFN">fires a
+ simple event </a> named <code><a href="#dfn-dischargingtimechange" class="internalDFN">dischargingtimechange</a></code> at the
+ <a href="#idl-def-BatteryManager" class="idlType"><code>BatteryManager</code></a> object.
+ </p>
+ <p>
+ The <code id="widl-BatteryManager-level">level</code>
+ attribute <em class="rfc2119" title="MUST">MUST</em> be set to 0 if the system's
+ battery is depleted and the system is about to be suspended, and to
+ 1.0 if the battery is full, the implementation is unable to report the
+ battery's level, or there is no battery attached to the system. When
+ the battery level is updated, the <a href="#dfn-user-agent" class="internalDFN">user agent</a> <em class="rfc2119" title="MUST">MUST</em> <a href="#dfn-queue-a-task" class="internalDFN">queue a
+ task</a> which sets the <code>level</code> attribute's value and
+ <a href="#dfn-fires-a-simple-event" class="internalDFN">fires a simple event</a> named <code><a href="#dfn-levelchange" class="internalDFN">levelchange</a></code> at
+ the <a href="#idl-def-BatteryManager" class="idlType"><code>BatteryManager</code></a> object.
+ </p>
+ <div class="note"><div class="note-title" aria-level="1" role="heading" id="h_note_2"><span>Note</span></div><p class="">
+ The definition of how often the <code><a href="#dfn-chargingtimechange" class="internalDFN">chargingtimechange</a></code>,
+ <code><a href="#dfn-dischargingtimechange" class="internalDFN">dischargingtimechange</a></code>, and <code><a href="#dfn-levelchange" class="internalDFN">levelchange</a>
+ </code> events are fired is left to the implementation.
+ </p></div>
+ <section id="multiple-batteries" typeof="bibo:Chapter" resource="#multiple-batteries" rel="bibo:Chapter">
+ <h3 role="heading" id="h3_multiple-batteries"><span class="secno">6.1 </span>Multiple batteries</h3>
+ <p>
+ If a hosting device contains more than one battery,
+ <a href="#idl-def-BatteryManager" class="idlType"><code>BatteryManager</code></a> <em class="rfc2119" title="SHOULD">SHOULD</em> expose an unified view of the batteries.
+ </p>
+ <p>
+ The <code>charging</code> attribute <em class="rfc2119" title="MUST">MUST</em> be set to true if at least
+ one battery's <code>charging</code> state as described above is true.
+ Otherwise, it <em class="rfc2119" title="MUST">MUST</em> be set to false.
+ </p>
+ <p>
+ The <code>chargingTime</code> attribute can be set to the maximum
+ charging time of the individual batteries if charging in parallel,
+ and to the sum of the individual charging times if charging serially.
+ </p>
+ <p>
+ The <code>dischargingTime</code> attribute can be set to the maximum
+ discharging time of the individual batteries if discharging in
+ parallel, and to the sum of individual discharging times if
+ discharging serially.
+ </p>
+ <p>
+ The <code>level</code> attribute can be set to the average of the
+ levels of batteries of same capacity, or the weighted average of the
+ battery level attributes for batteries of different capacities.
+ </p>
+ </section>
+ <section id="event-handlers">
+ <h3 role="heading" id="h3_event-handlers"><span class="secno">6.2 </span>Event handlers</h3>
+ <p>
+ The following are the <a href="#dfn-event-handlers" class="internalDFN">event handlers</a> (and their corresponding
+ <a href="#dfn-event-handler-event-types" class="internalDFN">event handler event types</a>) that <em class="rfc2119" title="MUST">MUST</em> be supported as
+ attributes by the <a href="#idl-def-BatteryManager" class="idlType"><code>BatteryManager</code></a> object:
+ </p>
+ <table class="simple">
+ <thead>
+ <tr>
+ <th>event handler</th>
+ <th>event handler event type</th>
+ </tr>
+ </thead>
+ <tbody>
+ <tr>
+ <td>
+ <strong><code id="widl-BatteryManager-onchargingchange">
+ onchargingchange
+ </code></strong>
+ </td>
+ <td>
+ <code><dfn id="dfn-chargingchange">
+ chargingchange
+ </dfn></code>
+ </td>
+ </tr>
+ <tr>
+ <td>
+ <strong><code id="widl-BatteryManager-onchargingtimechange">
+ onchargingtimechange
+ </code></strong>
+ </td>
+ <td>
+ <code><dfn id="dfn-chargingtimechange">
+ chargingtimechange
+ </dfn></code>
+ </td>
+ </tr>
+ <tr>
+ <td>
+ <strong><code id="widl-BatteryManager-ondischargingtimechange">
+ ondischargingtimechange
+ </code></strong>
+ </td>
+ <td>
+ <code><dfn id="dfn-dischargingtimechange">
+ dischargingtimechange
+ </dfn></code>
+ </td>
+ </tr>
+ <tr>
+ <td>
+ <strong><code id="widl-BatteryManager-onlevelchange">
+ onlevelchange
+ </code></strong>
+ </td>
+ <td>
+ <code><dfn id="dfn-levelchange">
+ levelchange
+ </dfn></code>
+ </td>
+ </tr>
+ </tbody>
+ </table>
+ </section>
+ </section>
+
+ <section class="informative" id="examples">
+ <!--OddPage--><h2 role="heading" id="h2_examples"><span class="secno">7. </span>Examples</h2><p><em>This section is non-normative.</em></p>
+ <p>
+ This trivial example writes the battery level to the console each time
+ the level changes:
+ </p>
+ <div class="example"><div class="example-title"><span>Example 1</span></div><pre class="example highlight prettyprint prettyprinted"><span class="com">// We get the initial value when the promise resolves ...</span><span class="pln">
+navigator</span><span class="pun">.</span><span class="pln">getBattery</span><span class="pun">().</span><span class="kwd">then</span><span class="pun">(</span><span class="kwd">function</span><span class="pun">(</span><span class="pln">battery</span><span class="pun">)</span><span class="pln"> </span><span class="pun">{</span><span class="pln">
+ console</span><span class="pun">.</span><span class="pln">log</span><span class="pun">(</span><span class="pln">battery</span><span class="pun">.</span><span class="pln">level</span><span class="pun">);</span><span class="pln">
+ </span><span class="com">// ... and any subsequent updates.</span><span class="pln">
+ battery</span><span class="pun">.</span><span class="pln">onlevelchange </span><span class="pun">=</span><span class="pln"> </span><span class="kwd">function</span><span class="pun">()</span><span class="pln"> </span><span class="pun">{</span><span class="pln">
+ console</span><span class="pun">.</span><span class="pln">log</span><span class="pun">(</span><span class="kwd">this</span><span class="pun">.</span><span class="pln">level</span><span class="pun">);</span><span class="pln">
+ </span><span class="pun">};</span><span class="pln">
+</span><span class="pun">});</span></pre></div>
+ <p>
+ Alternatively, the same using the <code>addEventListener()</code>
+ method:
+ </p>
+ <div class="example"><div class="example-title"><span>Example 2</span></div><pre class="example highlight prettyprint prettyprinted"><span class="pln">navigator</span><span class="pun">.</span><span class="pln">getBattery</span><span class="pun">().</span><span class="kwd">then</span><span class="pun">(</span><span class="kwd">function</span><span class="pun">(</span><span class="pln">battery</span><span class="pun">)</span><span class="pln"> </span><span class="pun">{</span><span class="pln">
+ console</span><span class="pun">.</span><span class="pln">log</span><span class="pun">(</span><span class="pln">battery</span><span class="pun">.</span><span class="pln">level</span><span class="pun">);</span><span class="pln">
+ battery</span><span class="pun">.</span><span class="pln">addEventListener</span><span class="pun">(</span><span class="str">'levelchange'</span><span class="pun">,</span><span class="pln"> </span><span class="kwd">function</span><span class="pun">()</span><span class="pln"> </span><span class="pun">{</span><span class="pln">
+ console</span><span class="pun">.</span><span class="pln">log</span><span class="pun">(</span><span class="kwd">this</span><span class="pun">.</span><span class="pln">level</span><span class="pun">);</span><span class="pln">
+ </span><span class="pun">});</span><span class="pln">
+</span><span class="pun">});</span></pre></div>
+ <p>
+ The following example updates the indicators to show the charging
+ state, level and time remaining in minutes:
+ </p>
+ <div class="example"><div class="example-title"><span>Example 3</span></div><pre class="example highlight prettyprint prettyprinted"><span class="dec"><!DOCTYPE html></span><span class="pln">
+</span><span class="tag"><html></span><span class="pln">
+</span><span class="tag"><head></span><span class="pln">
+ </span><span class="tag"><title></span><span class="pln">Battery Status API Example</span><span class="tag"></title></span><span class="pln">
+ </span><span class="tag"><script></span><span class="pln">
+ window</span><span class="pun">.</span><span class="pln">onload </span><span class="pun">=</span><span class="pln"> </span><span class="kwd">function</span><span class="pln"> </span><span class="pun">()</span><span class="pln"> </span><span class="pun">{</span><span class="pln">
+ </span><span class="kwd">function</span><span class="pln"> updateBatteryStatus</span><span class="pun">(</span><span class="pln">battery</span><span class="pun">)</span><span class="pln"> </span><span class="pun">{</span><span class="pln">
+ document</span><span class="pun">.</span><span class="pln">querySelector</span><span class="pun">(</span><span class="str">'#charging'</span><span class="pun">).</span><span class="pln">textContent </span><span class="pun">=</span><span class="pln"> battery</span><span class="pun">.</span><span class="pln">charging </span><span class="pun">?</span><span class="pln"> </span><span class="str">'charging'</span><span class="pln"> </span><span class="pun">:</span><span class="pln"> </span><span class="str">'not charging'</span><span class="pun">;</span><span class="pln">
+ document</span><span class="pun">.</span><span class="pln">querySelector</span><span class="pun">(</span><span class="str">'#level'</span><span class="pun">).</span><span class="pln">textContent </span><span class="pun">=</span><span class="pln"> battery</span><span class="pun">.</span><span class="pln">level</span><span class="pun">;</span><span class="pln">
+ document</span><span class="pun">.</span><span class="pln">querySelector</span><span class="pun">(</span><span class="str">'#dischargingTime'</span><span class="pun">).</span><span class="pln">textContent </span><span class="pun">=</span><span class="pln"> battery</span><span class="pun">.</span><span class="pln">dischargingTime </span><span class="pun">/</span><span class="pln"> </span><span class="lit">60</span><span class="pun">;</span><span class="pln">
+ </span><span class="pun">}</span><span class="pln">
+
+ navigator</span><span class="pun">.</span><span class="pln">getBattery</span><span class="pun">().</span><span class="pln">then</span><span class="pun">(</span><span class="kwd">function</span><span class="pun">(</span><span class="pln">battery</span><span class="pun">)</span><span class="pln"> </span><span class="pun">{</span><span class="pln">
+ </span><span class="com">// Update the battery status initially when the promise resolves ...</span><span class="pln">
+ updateBatteryStatus</span><span class="pun">(</span><span class="pln">battery</span><span class="pun">);</span><span class="pln">
+
+ </span><span class="com">// .. and for any subsequent updates.</span><span class="pln">
+ battery</span><span class="pun">.</span><span class="pln">onchargingchange </span><span class="pun">=</span><span class="pln"> </span><span class="kwd">function</span><span class="pln"> </span><span class="pun">()</span><span class="pln"> </span><span class="pun">{</span><span class="pln">
+ updateBatteryStatus</span><span class="pun">(</span><span class="pln">battery</span><span class="pun">);</span><span class="pln">
+ </span><span class="pun">};</span><span class="pln">
+
+ battery</span><span class="pun">.</span><span class="pln">onlevelchange </span><span class="pun">=</span><span class="pln"> </span><span class="kwd">function</span><span class="pln"> </span><span class="pun">()</span><span class="pln"> </span><span class="pun">{</span><span class="pln">
+ updateBatteryStatus</span><span class="pun">(</span><span class="pln">battery</span><span class="pun">);</span><span class="pln">
+ </span><span class="pun">};</span><span class="pln">
+
+ battery</span><span class="pun">.</span><span class="pln">ondischargingtimechange </span><span class="pun">=</span><span class="pln"> </span><span class="kwd">function</span><span class="pln"> </span><span class="pun">()</span><span class="pln"> </span><span class="pun">{</span><span class="pln">
+ updateBatteryStatus</span><span class="pun">(</span><span class="pln">battery</span><span class="pun">);</span><span class="pln">
+ </span><span class="pun">};</span><span class="pln">
+ </span><span class="pun">});</span><span class="pln">
+ </span><span class="pun">};</span><span class="pln">
+ </span><span class="tag"></script></span><span class="pln">
+</span><span class="tag"></head></span><span class="pln">
+</span><span class="tag"><body></span><span class="pln">
+ </span><span class="tag"><div</span><span class="pln"> </span><span class="atn">id</span><span class="pun">=</span><span class="atv">"charging"</span><span class="tag">></span><span class="pln">(charging state unknown)</span><span class="tag"></div></span><span class="pln">
+ </span><span class="tag"><div</span><span class="pln"> </span><span class="atn">id</span><span class="pun">=</span><span class="atv">"level"</span><span class="tag">></span><span class="pln">(battery level unknown)</span><span class="tag"></div></span><span class="pln">
+ </span><span class="tag"><div</span><span class="pln"> </span><span class="atn">id</span><span class="pun">=</span><span class="atv">"dischargingTime"</span><span class="tag">></span><span class="pln">(discharging time unknown)</span><span class="tag"></div></span><span class="pln">
+</span><span class="tag"></body></span><span class="pln">
+</span><span class="tag"></html></span></pre></div>
+ </section>
+ <section class="appendix" id="acknowledgements">
+ <!--OddPage--><h2 role="heading" id="h2_acknowledgements"><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 their invaluable feedback
+ based on prototype implementations. Many thanks to the people behind
+ the System Information API and Device Orientation Event specification
+ for the initial inspiration. Also thanks to the nice folks bringing us
+ the Page Visibility specification, which motivated the editor of this
+ specification to write the introduction chapter discussing some
+ real-world high value use cases that apply equally to this
+ specification. Special thanks to all the participants of the Device
+ APIs Working Group and others who have sent in substantial feedback
+ and comments, and made the Web a better place for everyone by
+ doing so.
+ </p>
+ </section>
+
+
+<section id="references" class="appendix" typeof="bibo:Chapter" resource="#references" rel="bibo:Chapter"><!--OddPage--><h2 role="heading" id="h2_references"><span class="secno">B. </span>References</h2><section id="normative-references" typeof="bibo:Chapter" resource="#normative-references" rel="bibo:Chapter"><h3 role="heading" id="h3_normative-references"><span class="secno">B.1 </span>Normative references</h3><dl class="bibliography" about=""><dt id="bib-ECMASCRIPT">[ECMASCRIPT]</dt><dd rel="dcterms:requires">Allen Wirfs-Brock. <a href="http://people.mozilla.org/~jorendorff/es6-draft.html"><cite>ECMA-262 ECMAScript Language Specification, Edition 6</cite></a>. Draft. URL: <a href="http://people.mozilla.org/~jorendorff/es6-draft.html">http://people.mozilla.org/~jorendorff/es6-draft.html</a>
+</dd><dt id="bib-HTML5">[HTML5]</dt><dd rel="dcterms:requires">Robin Berjon; Steve Faulkner; Travis Leithead; Erika Doyle Navara; Edward O'Connor; Silvia Pfeiffer. <a href="http://www.w3.org/TR/html5/"><cite>HTML5</cite></a>. 28 October 2014. W3C Recommendation. URL: <a href="http://www.w3.org/TR/html5/">http://www.w3.org/TR/html5/</a>
+</dd><dt id="bib-RFC2119">[RFC2119]</dt><dd rel="dcterms:requires">S. Bradner. <a href="https://tools.ietf.org/html/rfc2119"><cite>Key words for use in RFCs to Indicate Requirement Levels</cite></a>. March 1997. Best Current Practice. URL: <a href="https://tools.ietf.org/html/rfc2119">https://tools.ietf.org/html/rfc2119</a>
+</dd><dt id="bib-WEBIDL">[WEBIDL]</dt><dd rel="dcterms:requires">Cameron McCormack. <a href="http://www.w3.org/TR/WebIDL/"><cite>Web IDL</cite></a>. 19 April 2012. W3C Candidate Recommendation. URL: <a href="http://www.w3.org/TR/WebIDL/">http://www.w3.org/TR/WebIDL/</a>
+</dd></dl></section></section></body></html>
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Received on Friday, 14 November 2014 15:59:25 UTC