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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "DTD/xhtml1-transitional.dtd">
<!--
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WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 
OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 
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-->

<html>
  <head>
    <title>Geolocation API</title>
    <link rel="stylesheet" type="text/css" href="gears.css" />
</head>

<body>

<h1>Geolocation API</h1>

<div id="pagecontent">

<p>The Geolocation API enables a web application to obtain a user's
geographical position.</p>

<h3>Contents</h3>

<ol class="toc">
  <li><a href="#overview">Overview</a></li>
  <li><a href="#example">Example</a></li>
  <li><a href="#classes">Classes</a>
      <ol>
      <li><a href="#geolocation">Geolocation class</a> </li>  
      <li><a href="#position">Position class</a></li>
      <li><a href="#positionoptions">PositionOptions class</a></li>      
      <li><a href="#positionerror">PositionError class</a></li>
      <li><a href="#coords">Coords class</a></li>
      <li><a href="#address">Address class</a></li>
    </ol>
    </li>
  </ol>

<h2 id="overview">Overview</h2>

<p>The Geolocation API enables a web application to:</p>

<ul>
<li>Obtain the user's current position, using the <code><a href="#getCurrent">getCurrentPosition</a></code> method</li>  
<li>Watch the user's position as it changes over time, using the <code><a href="#watchPosition">watchPosition</a></code> method</li>
<li>Quickly and cheaply obtain the user's last known position, using
the <code><a href="#lastPosition">lastPosition</a></code> property</li>
</ul>

<p>The Geolocation API provides the best estimate of the user's position
using a number of sources (called location providers). These providers
may be onboard (GPS for example) or server-based (a network location
provider). The <code><a href="#getCurrent">getCurrentPosition</a></code> and <code><a href="#watchPosition">watchPosition</a></code> methods
support an optional parameter of type <code><a href="#positionoptions">PositionOptions</a></code> which lets you specify which location providers to use. </p>

<p>To find out how to implement your own network location provider for use with
the Geolocation API, see the description of the
<a href="geolocation_network_protocol.html">Geolocation API network protocol</a>
that Gears uses to communicate with network location providers.</p>

<h4>Permission</h4>

<p>A site's permission to use location information is separate from the
permission required by other Gears APIs. Permission is granted by the user
in the same way as for other Gears APIs, through a dialog. If you would like
to customize the default dialog, you can explicitly call the
<code><a href="#getpermission">getPermission</a></code> method.</p>


<h2 id="example">Example</h2>

<pre><code>&lt;script type="text/javascript" src="<a href='tools.html#gears_init'>gears_init.js</a>"&gt;&lt;/script&gt;
&lt;script type="text/javascript"&gt;
var geo = google.gears.factory.create('beta.geolocation');

function updatePosition(position) {
  alert('Current lat/lon is: ' + position.latitude + ',' + position.longitude);
}

function handleError(positionError) {
  alert('Attempt to get location failed: ' + positionError.message);
}

geo.getCurrentPosition(updatePosition, handleError);
&lt;/script&gt;</code></pre>


<h2 id="classes">Classes</h2>

<pre><code><a href="#geolocation">Geolocation class</a> 
  readonly attribute Position lastPosition
  readonly attribute boolean hasPermission
  void getCurrentPosition(successCallback, [errorCallback], [options])
  int  watchPosition(successCallback, [errorCallback], [options])
  void clearWatch(int watchId)
  boolean getPermission([siteName], [imageUrl], [extraMessage])</code></pre>
  
<pre><code><a href="#position">Position class</a>
  readonly attribute Date timestamp
  readonly attribute Coords coords
  readonly attribute Address gearsAddress
  readonly attribute double latitude
  readonly attribute double longitude
  readonly attribute double accuracy
  readonly attribute double altitude
  readonly attribute double altitudeAccuracy</code></pre>

<pre><code><a href="#positionoptions">PositionOptions class</a>
  readwrite attribute bool enableHighAccuracy
  readwrite attribute int maximumAge
  readwrite attribute int timeout
  readwrite attribute bool gearsRequestAddress
  readwrite attribute string gearsAddressLanguage
  readwrite attribute string[] gearsLocationProviderUrls</code></pre>

<pre><code><a href="#positionerror">PositionError class</a>
  readonly attribute int UNKNOWN_ERROR
  readonly attribute int PERMISSION_DENIED
  readonly attribute int POSITION_UNAVAILABLE
  readonly attribute int TIMEOUT
  readonly attribute int code
  readonly attribute string message</code></pre>

<pre><code><a href="#coords">Coords class</a>
  readonly attribute double latitude
  readonly attribute double longitude
  readonly attribute double accuracy
  readonly attribute double altitude
  readonly attribute double altitudeAccuracy</code></pre>

<pre><code><a href="#address">Address class</a>
  readonly attribute string streetNumber
  readonly attribute string street
  readonly attribute string premises
  readonly attribute string city
  readonly attribute string county
  readonly attribute string region
  readonly attribute string country
  readonly attribute string countryCode
  readonly attribute string postalCode</code></pre>
  

<h2 id="geolocation">Geolocation class</h2>

<h3>Methods</h3>

<table>
  <tr class="odd">
  <th colspan="2"><code><a name="getCurrent" id="getCurrent"></a>void getCurrentPosition(successCallback, [errorCallback], [options])</code></th>
</tr>
  <tr class="odd">
    <td width="113">Return value: </td>
    <td class="code">This method has no return value.</td>
  </tr>
<tr class="odd">
<td>Parameters:</td>
<td class="odd"><code>successCallback(Position position)</code>
    <br />
    <code>errorCallback(PositionError error)</code> - optional,
    pass <code>null</code> if you do not want to make use of the callback.
    <br />
    <code>options</code> - optional, specifies the options to use for this
    request, see <code><a href="#positionoptions">PositionOptions</a></code>.</td>
</tr><tr class="odd">
    <td>Description:</td>
    <td class="odd">Provides a previously cached position if available or
    attempts to obtain a new position.<br><br>
    If <code>PositionOptions.maximumAge</code> is zero, the cached position is
    not used and a new position fix is always sought. The method will throw an
    exception if no location providers are used.<br><br>
    If <code>PositionOptions.maximumAge</code> is non-zero, Gears will call the
    success callback if the cached position is more recent than
    <code>PositionOptions.maximumAge</code>. If not, Gears will attempt to
    obtain a new position fix. The success callback is called exactly once as
    soon
    as a position fix is obtained, or the error callback is called on failure.
    If the cached position is not sufficiently recent and no location providers
    are used, the error callback is called.<br><br>
    Whenever Gears attempts to obtain a new position fix, this is subject to
    <code>PositionOptions.timeout</code>. The error callback is called on
    timeout.
<br />
<br />
The signature of the success callback is:<br />
<code>function successCallback(Position position)</code><br />
<br />The signature of the error callback is:<br />
<code>function errorCallback(PositionError error)</code></td>
  </tr>
</table>

<table>
  <tr class="odd">
  <th colspan="2"><code><a name="watchPosition" id="watchPosition"></a>int
watchPosition(function successCallback,
[function errorCallback], [PositionOptions options])</code></th>
</tr>
  <tr class="odd">
    <td width="113">Return value: </td>
    <td class="code">A unique watch identifier.</td>
  </tr>
<tr class="odd">
<td>Parameters:</td>
<td class="odd"><code>successCallback(Position position)</code><br />
<code>errorCallback(PositionError error)</code> - optional,
pass <code>null</code> if you do not want to make use of the callback.<br />
<code>options</code> - optional, specifies the options to use for this
request, see <code><a href="#positionoptions">PositionOptions</a></code>.</td>
</tr>
  <tr class="odd">
    <td>Description:</td>
    <td class="odd">Provides a previously cached position if available and
    repeatedly obtains a new position.<br><br>
    If <code>PositionOptions.maximumAge</code> is zero, the cached position is
    not used and a new position fix is always sought. The method will throw an
    exception if no location providers are used.<br><br>
    If <code>PositionOptions.maximumAge</code> is non-zero, Gears will call the
    success callback if the cached position is more recent than
    <code>PositionOptions.maximumAge</code>. If any case, Gears will then
    attempt to obtain a new position fix. The success callback function is
    called as soon as a good position is available and whenever the position
    changes significantly, subject to a maximum callback frequency. The error
    callback is called if a fatal error occurs which will prevent a position fix
    from ever being obtained by this watch. If the cached position is not
    sufficiently recent and no location providers are used, the error callback
    is called.<br><br>
    Whenever Gears attempts to obtain a new position fix, this is subject to
    <code>PositionOptions.timeout</code>. The error callback is called on
    timeout when obtaining the first position fix, or if Gears detects that the
    device has moved, but is unable to obtain a new position fix within the time
    specifed by <code>PositionOptions.timeout</code>.
<br />
<br />
The signature of the success callback is:<br />
<code>function successCallback(Position position)</code><br />
<br />
The signature of the error callback is:<br />
<code>function errorCallback(PositionError error)</code> </td>
</tr>
</table>

<table>
  <tr class="odd">
  <th colspan="2"><code>void clearWatch(int watchId)</code></th>
  </tr>
  <tr class="odd">
    <td width="113">Return value: </td>
    <td class="code">This method has no return value.</td>
  </tr>
  <tr class="odd">
<td>Parameter:</td>
<td class="odd"><code>watchId</code> - the identifier of the watch to stop.</td>
</tr>
<tr class="odd">
  <td>Description:</td>
  <td class="odd">Stop watching the current position.</td>
  </tr>
</table>

<a name="getpermission"></a>
<table>
  <tr class="odd">
    <th colspan="2"><code>boolean getPermission([siteName], [imageUrl], [extraMessage])</code></th>
  </tr>
  <tr class="odd">
    <td width="113">Return value:</td>
    <td class="odd">Indicates whether the site has permission to access the user's location through Gears.</td>
</tr>
  <tr class="odd">
    <td>Parameters:</td>
    <td class="odd">
      <code>siteName</code>
      - optional, friendly name of the site requesting permission.
      <br>
      <code>imageUrl</code>
      - optional, URL of a .png file to display in the dialog.
      <br>
      <code>extraMessage</code>
      - optional, site-specific text to display to users in the security dialog.</td>
  </tr>
  <tr class="odd">
    <td>Description:</td>
  <td class="odd">Lets a site manually trigger the Gears location security
dialog, optionally with UI customizations.<br />
<br />
It is always safe to call this function; it will return
    immediately if the site already has permission to access the user's
location through Gears. All arguments are optional. The dialog will only
show those that are specified.    </td>
</tr>
</table>

<h3>Attributes</h3>

<table>
<tr class="odd">
  <th width="170">Attribute</th>
  <th width="110">Type</th>
  <th>Description</th>
</tr>
<tr class="odd">
  <td><strong><a name="lastPosition" id="lastPosition"></a>lastPosition</strong></td>
  <td class="odd">readonly  Position</td>
  <td class="odd">The last known position, or null if there is no last known
  position. This does not actively trigger obtaining a new position fix,
  so it is quick and does not consume power or computational resources.</td>
</tr>
<tr class="odd">
  <td><strong>hasPermission</strong></td>
  <td class="odd">readonly boolean</td>
  <td class="odd">Returns true if the site already has permission to access the
  user's location through Gears.</td>
</tr>
</table>


<h2 id="position">Position class</h2>

<h3>Attributes</h3> 

<table>
<tr class="odd">
  <th width="170">Attribute</th>
  <th width="110">Type</th>
  <th>Description</th>
</tr>
<tr class="odd">
  <td><strong>timestamp</strong></td>
  <td class="odd">readonly Date</td>
  <td class="odd">The time when the location was established.</td>
</tr>
<tr class="odd">
  <td><strong>coords</strong></td>
  <td class="odd">readonly Coords</td>
  <td class="odd">The coordinates of the position, expressed as a latitude, longitude and altitude.
  See <code><a href="#coords">Coords</a></code>.</td>
</tr>
<tr class="odd">
  <td><strong>gearsAddress</strong></td>
  <td class="odd">readonly Address</td>
  <td class="odd">A reverse-geocoded address, if requested and available.
  See <code><a href="#address">Address</a></code>.</td>
</tr>
<tr class="odd">
  <td><strong>latitude</strong></td>
  <td class="odd">readonly double</td>
  <td class="odd">Deprecated. Applications should use Position.coords.latitude.</td>
</tr>
<tr class="odd">
  <td><strong>longitude</strong></td>
  <td class="odd">readonly double</td>
  <td class="odd">Deprecated. Applications should use Position.coords.longitude.</td>
</tr>
<tr class="odd">
  <td><strong>accuracy</strong></td>
  <td class="odd">readonly double</td>
  <td class="odd">Deprecated. Applications should use Position.coords.accuracy.</td>
</tr>
<tr class="odd">
  <td><strong>altitude</strong></td>
  <td class="odd">readonly double</td>
  <td class="odd">Deprecated. Applications should use Position.coords.altitude.</td>
</tr>
<tr class="odd">
  <td><strong>altitudeAccuracy</strong></td>
  <td class="odd">readonly double </td>
  <td class="odd">Deprecated. Applications should use Position.coords.altitudeAccuracy.</td>
</tr>
</table>


<h2 id="positionoptions">PositionOptions class</h2>

<h3>Attributes</h3>

<table>
<tr class="odd">
  <th width="170">Attribute</th>
  <th width="110">Type</th>
  <th>Description</th>
</tr>
<tr class="odd">
  <td><strong><a name="enableHigh" id="enableHigh"></a>enableHighAccuracy</strong></td>
  <td class="odd">readwrite bool</td>
  <td class="odd">Optional, requests the most accurate possible results.
  This may result in slower response times or increased battery consumption.
  Also, there is no guarantee that the device will be able to provide more
  accurate results than if this flag is not specified. The default value
  is false.</td>
</tr>
<tr class="odd">
  <td><strong>maximumAge</strong></td>
  <td class="odd">readwrite int</td>
  <td class="odd">Optional, specifies the maximum permissible age, in
  milliseconds, of a cached
  position provided by the getCurrentPosition and watchPosition methods. When
  either of these methods is called, if Gears has a cached permission and it is
  more recent than the specified maximum age, the success callback will be
  called immediatley with this cached position. If not, Gears will attempt to
  obtain a new position fix. If a value of Infinity is specified, no time limit
  is applied. The default value is zero, meaning that a cached position is never
  used and Gears wil always attempt to get a new position fix.</td>
</tr>
<tr class="odd">
  <td><strong>timeout</strong></td>
  <td class="odd">readwrite int</td>
  <td class="odd">Optional, specifies the maximum time period, in milliseconds,
  for which Gears
  should attempt to obtain a position fix. If a position fix can not be obtained
  within this period, the error callback is invoked with code TIMEOUT. The value
  is limited to a non-negative signed 32 bit signed integer. If this value is
  not set, no time limit is applied.</td>
</tr>
<tr class="odd">
  <td><strong>gearsRequestAddress</strong></td>
  <td class="odd">readwrite bool</td>
  <td class="odd">Optional, requests reverse geocoded address information
  as part of the position data. Reverse geocoding is not performed if this
  flag is not specified or if it is set to false.</td>
</tr>
<tr class="odd">
  <td><strong>gearsAddressLanguage</strong></td>
  <td class="odd">readwrite string</td>
  <td class="odd">Optional, specifies the language in which the address (if
  requested) should be returned. Specify the language in accordance with
  RFC 3066, en-GB for British English for example.
  <br><br>
  If this is not specified, the address is provided in the default
  language of the location provider used to perform the reverse geocoding.</td>
</tr>
<tr class="odd">
  <td><strong><a name="providerURLs" id="providerURLs"></a>gearsLocationProviderUrls</strong></td>
  <td class="odd">readwrite string[]</td>
  <td class="odd">Optional, specifies one or more URLs to contact to convert
  geolocation signals into positions. If
  unset, defaults to a single Google-implemented service. The array can also be
  cleared, or set to null, so that no location providers are used.</td>
</tr>
</table>


<h2 id="positionerror">PositionError class</h2>

<h3>Attributes</h3>

<table>
<tr class="odd">
  <th width="170">Attribute</th>
  <th width="110">Type</th>
  <th>Description</th>
</tr>
<tr class="odd">
  <td><strong>UNKNOWN_ERROR</strong></td>
  <td class="odd">readonly int</td>
  <td class="odd">W3C Geolocation API error code constant. Not used by Gears.
  </td>
</tr>
<tr class="odd">
  <td><strong>PERMISSION_DENIED</strong></td>
  <td class="odd">readonly int</td>
  <td class="odd">W3C Geolocation API error code constant. Not used by Gears
  </td>
</tr>
<tr class="odd">
  <td><strong>POSITION_UNAVAILABLE</strong></td>
  <td class="odd">readonly int</td>
  <td class="odd">W3C Geolocation API error code constant. No position fix could
  be obtained.</td>
</tr>
<tr class="odd">
  <td><strong>TIMEOUT</strong></td>
  <td class="odd">readonly int</td>
  <td class="odd">W3C Geolocation API error code constant. The specified maximum
  time elapsed before a position could be obtained.</td>
</tr>
<tr class="odd">
  <td><strong>code</strong></td>
  <td class="odd">readonly int</td>
  <td class="odd">
    A code identifying the reason for the error. Possible values are listed
    below. Note that Gears does not use all of the W3C Geolocation API error
    codes.
    <ul>
      <li>PositionError.POSITION_UNAVAILABLE
      <li>PositionError.TIMEOUT
    </ul>
  </td>
</tr>
<tr class="odd">
  <td><strong>message</strong></td>
  <td class="odd">readonly string</td>
  <td class="odd">A human readable message, suitable for logs.</td>
</tr>
</table>


<h2 id="coords">Coords class</h2> 

<h3>Attributes</h3>

<table>
<tr class="odd">
  <th width="170">Attribute</th>
  <th width="110">Type</th>
  <th>Description</th>
</tr>
<tr class="odd">
  <td><strong>latitude</strong></td>
  <td class="odd">readonly double</td>
  <td class="odd"> Latitude in degrees using the World Geodetic System 1984
  (WGS84) datum.</td>
</tr>
<tr class="odd">
  <td><strong>longitude</strong></td>
  <td class="odd">readonly double</td>
  <td class="odd"> Longitude in degrees (WGS84 datum).</td>
</tr>
<tr class="odd">
  <td><strong>accuracy</strong></td>
  <td class="odd">readonly double</td>
  <td class="odd">The horizontal accuracy of the position in meters, or null
  if not available.</td>
</tr>
<tr class="odd">
  <td><strong>altitude</strong></td>
  <td class="odd">readonly double</td>
  <td class="odd">Height in meters (WGS84 datum), or null if not available.</td>
</tr>
<tr class="odd">
  <td><strong>altitudeAccuracy</strong></td>
  <td class="odd">readonly double </td>
  <td class="odd">The vertical accuracy of the position in meters, or null
  if not available.</td>
</tr>
</table>


<h2 id="address">Address class</h2> 

<h3>Attributes</h3>

<table>
<tr class="odd">
  <th width="170">Attribute</th>
  <th width="110">Type</th>
  <th>Description</th>
</tr>
<tr class="odd">
  <td><strong>streetNumber</strong></td>
  <td class="odd">readonly string</td>
  <td class="odd"> The building's street number.</td>
</tr>
<tr class="odd">
  <td><strong>street</strong></td>
  <td class="odd">readonly string</td>
  <td class="odd">Street name.</td>
</tr>
<tr class="odd">
  <td><strong>premises</strong></td>
  <td class="odd">readonly string</td>
  <td class="odd">Premises, e.g. building name.</td>
</tr>
<tr class="odd">
  <td><strong>city</strong></td>
  <td class="odd">readonly string</td>
  <td class="odd">City name.</td>
</tr>
<tr class="odd">
  <td><strong>county</strong></td>
  <td class="odd">readonly string</td>
  <td class="odd">County name.</td>
</tr>
<tr class="odd">
  <td><strong>region</strong></td>
  <td class="odd">readonly string</td>
  <td class="odd">Region, e.g. a state in the US.</td>
</tr>
<tr class="odd">
  <td><strong>country</strong></td>
  <td class="odd">readonly string</td>
  <td class="odd">Country.</td>
</tr>
<tr class="odd">
  <td><strong>countryCode</strong></td>
  <td class="odd">readonly string</td>
  <td class="odd">Country code (ISO 3166-1).</td>
</tr>
<tr class="odd">
  <td><strong>postalCode</strong></td>
  <td class="odd">readonly string</td>
  <td class="odd">Postal code. This is the zip code in the US and postcode in the UK.</td>
</tr>
</table>




</div>
</body>
</html>
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Change log

r3365 by gears.daemon on Jun 25, 2009   Diff 
[Author: steveblock]

Fixes some typos in the Geolocation SDK
documentation.

PRESUBMIT=passed
R=andreip
CC=gears-eng@googlegroups.com
APPROVED=andreip
DELTA=10  (3 added, 0 deleted, 7 changed)
OCL=11604936
SCL=11667338
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Older revisions

r3163 by gears.daemon on Jan 15, 2009   Diff 
[Author: steveblock]

Adds documentation for Geolocation
position.coords

...
r3118 by gears.daemon on Dec 16, 2008   Diff 
[Author: steveblock]

Adds maximumAge option to Geolocation
API.
Also disallows empty string for
...
r3041 by gears.daemon on Nov 25, 2008   Diff 
[Author: steveblock]

Adds Geolocation error code constants
to JavaScript PositionError object.

...
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