nsIDOMGeoGeolocation 编辑

Summary

The nsIDOMGeoGeolocation interface provides access to geolocation information.  You can request a single notification of the user's current position, or you can monitor the position over time.

Inherits from: nsISupports

Implemented by: @mozilla.org/geolocation;1. Starting in Gecko 1.9.2, you can access this service using:

var geolocation = Components.classes["@mozilla.org/geolocation;1"]
                            .getService(Components.interfaces.nsIDOMGeoGeolocation);

Note: if nsIDGeoGeolocation throws an exception when importing, try using this:

var geolocation = Components.classes["@mozilla.org/geolocation;1"]
                            .getService(Components.interfaces.nsISupports);

Method Overview

Attributes

Methods

clearWatch()

When the clearWatch() method is called, the watch() process stops calling for new position identifiers and cease invoking callbacks.

void clearWatch(
  in unsigned short watchId
);

Parameters

None.

getCurrentPosition()

Acquires the user's current position via a new position object. If this fails, errorCallback is invoked with an nsIDOMGeoPositionError argument.

void getCurrentPosition(
  in nsIDOMGeoPositionCallback successCallback,
  [optional] in nsIDOMGeoPositionErrorCallback errorCallback,
  [optional] in nsIDOMGeoPositionOptions options
);

Parameters

successCallback

An nsIDOMGeoPositionCallback to be called when the current position is available.

errorCallback

An nsIDOMGeoPositionErrorCallback that is called if an error occurs while retrieving the position; this parameter is optional.

options

An nsIDOMGeoPositionOptions object specifying options; this parameter is optional.

watchPosition()

Similar to getCurrentPosition(), except it continues to call the callback with updated position information periodically until clearWatch() is called.

unsigned short watchPosition(
  in nsIDOMGeoPositionCallback successCallback,
  [optional] in nsIDOMGeoPositionErrorCallback errorCallback,
  [optional] in nsIDOMGeoPositionOptions options
);

Parameters

successCallback

An nsIDOMGeoPositionCallback that is to be called whenever new position information is available.

errorCallback

An nsIDOMGeoPositionErrorCallback to call when an error occurs; this is an optional parameter.

options

An nsIDOMGeoPositionOptions object specifying options; this parameter is optional.

Return value

An ID number that can be used to reference the watcher in the future when calling clearWatch().