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    nsIContentPrefService

    Deprecated since Gecko 20.0 (Firefox 20.0 / Thunderbird 20.0 / SeaMonkey 2.17)
    This feature has been removed from the Web. Though some browsers may still support it, it is in the process of being dropped. Do not use it in old or new projects. Pages or Web apps using it may break at any time.

    Use the asynchronous interface nsIContentPrefService2 instead.

    Provides a way for extensions and browser code to save preferences for specific websites. Preferences are saved as key/value pairs on a per-website basis.

    Please add a summary to this article.
      Last changed in Gecko 2 (Firefox 4 / Thunderbird 3.3 / SeaMonkey 2.1)

    Inherits from: nsISupports

    Implemented by: @mozilla.org/content-pref/service;1. To create an instance, use:

    var contentPrefService = Components.classes["@mozilla.org/content-pref/service;1"]
                             .getService(Components.interfaces.nsIContentPrefService);
    

    Method overview

    void addObserver(in AString aName, in nsIContentPrefObserver aObserver);
    nsIVariant getPref(in nsIVariant aGroup, in AString aName, [optional] in nsIContentPrefCallback aCallback);
    nsIPropertyBag2 getPrefs(in nsIVariant aGroup);
    nsIPropertyBag2 getPrefsByName(in AString aName);
    boolean hasPref(in nsIVariant aGroup, in AString aName);
    void removeGroupedPrefs();
    void removeObserver(in AString aName, in nsIContentPrefObserver aObserver);
    void removePref(in nsIVariant aGroup, in AString aName);
    void removePrefsByName(in AString aName);
    void setPref(in nsIVariant aGroup, in AString aName, in nsIVariant aValue);

    Attributes

    Attribute Type Description
    DBConnection mozIStorageConnection The database connection to the content preferences database. Useful for accessing and manipulating preferences in ways that are caller-specific or for which there is not yet a generic method, although generic functionality useful to multiple callers should generally be added to this unfrozen interface. Also useful for testing the database creation and migration code. Read only.
    grouper nsIContentURIGrouper The component that the service uses to determine the groups to which URIs belong. By default, this is the "hostname grouper," which groups URIs by full hostname (in otherwords, by site). Read only.

    Methods

    addObserver()

    Adds an observer that monitors a preference for changes.

    void addObserver(
      in AString aName,
      in nsIContentPrefObserver aObserver
    );
    

    Parameters

    aName
    The name of the preference to observe. You may specify null to add a generic observer that is notified of all preference changes.
    aObserver
    The name of an object implementing nsIContentPrefObserver that will receive notifications of changes to the preference's value.

    getPref()

    Returns the value of a preference saved for a particular site.

    Note: Prior to Gecko 2.0, the site could only be specified by nsIURI. Now a string can be used as well.

    nsIVariant getPref(
      in nsIVariant aGroup,
      in AString aName,
      in nsIContentPrefCallback aCallback Optional 
    );
    

    Parameters

    aGroup
    The group for which to retrieve a preference; this may be specified as either a URI or as a string; in either case, the group consists of all sites matching the hostname portion of the specified URI. Specify null to get the preference from the global preference space; those preferences apply to all sites.
    aName
    The name of the preference whose value is to be retrieved.
    aCallback
    An optional nsIContentPrefCallback to receive the result. If desired, JavaScript callers can instead provide a function to call upon completion.

    Return value

    The preference's value is returned; this value may be a string, integer, boolean, or any other value. The result may be null (nsIDataType:VTYPE_EMPTY) if the preference's value is either null, or undefined (nsIDataType:VTYPE_VOID) if there is no saved preference by the specified name.

    Exceptions thrown

    NS_ERROR_ILLEGAL_VALUE
    If aGroup is not a string, nsIURI, or null. Or if aName is null or an empty string

    getPrefs()

    Get all preferences and their values for the specified URI.

    Note: Prior to Gecko 2.0, the site could only be specified by nsIURI. Now a string can be used as well.

    nsIPropertyBag2 getPrefs(
      in nsIVariant aGroup
    );
    

    Parameters

    aGroup
    The group whose preferences are to be retrieved; this may be specified as either a URI or as a string; in either case, the group consists of all sites matching the hostname portion of the specified URI. Specify null to get the preferences from the global preference space; those preferences apply to all sites.

    Return value

    The result is an nsIPropertyBag2 containing the preferences and their values.

    Exceptions thrown

    NS_ERROR_ILLEGAL_VALUE
    If aGroup is not a string, nsIURI, or null.

    Requires Gecko 1.9.2 (Firefox 3.6 / Thunderbird 3.1 / Fennec 1.0)

    getPrefsByName()

    Returns the values of all preferences with the specified name.

    nsIPropertyBag2 getPrefsByName(
      in AString aName
    );
    

    Parameters

    aName
    The name for which all values are to be returned.

    Return value

    The result is an nsIPropertyBag2 containing the preferences and their values.

    Exceptions thrown

    NS_ERROR_ILLEGAL_VALUE
    If aName is null or an empty string.

    hasPref()

    Determines whether or not a preference exists.

    Note: Prior to Gecko 2.0, the site could only be specified by nsIURI. Now a string can be used as well.

    boolean hasPref(
      in nsIVariant aGroup,
      in AString aName
    );
    

    Parameters

    aGroup
    The group for which to see if a preference exists; this may be specified as either a URI or as a string. In either case, the group consists of all sites matching the hostname portion of the specified URI. Specify null to check for the preference in the global preference space; those preferences apply to all sites.
    aName
    The name of the preference whose existence is to be determined.

    Return value

    true if the preference exists; otherwise false.

    Exceptions thrown

    NS_ERROR_ILLEGAL_VALUE
    If aGroup is not a string, nsIURI, or null. Or if aName is null or an empty string

    Requires Gecko 1.9.1 (Firefox 3.5 / Thunderbird 3.0 / SeaMonkey 2.0)

    removeGroupedPrefs()

    Remove all grouped prefs. Useful for removing references to the sites the user has visited when the user clears their private data.

    void removeGroupedPrefs();
    

    removeObserver()

    Removes an observer that's presently monitoring a preference for changes.

    void removeObserver(
      in AString aName,
      in nsIContentPrefObserver aObserver
    );
    

    Parameters

    aName
    The name of the preference to stop observing. You may specify null to remove a generic observer that is monitoring all preference changes.
    aObserver
    The name of the observer that will cease receiving notifications of changes to the preference's value.

    removePref()

    Removes the specified preference.

    Note: Prior to Gecko 2.0, the site could only be specified by nsIURI. Now a string can be used as well.

    void removePref(
      in nsIVariant aGroup,
      in AString aName
    );
    

    Parameters

    aGroup
    The group for which to delete a preference; this may be specified as either a URI or as a string. In either case, the group consists of all sites matching the hostname portion of the specified URI. Specify null to delete the preference from the global preference space; those preferences apply to all sites.
    aName
    The name of the preference to remove.

    Exceptions thrown

    NS_ERROR_ILLEGAL_VALUE
    If aGroup is not a string, nsIURI, or null. Or if aName is null or an empty string

    Requires Gecko 1.9.2 (Firefox 3.6 / Thunderbird 3.1 / Fennec 1.0)

    removePrefsByName()

    Removes all preferences with the specified name.

    void removePrefsByName(
      in AString aName
    );
    

    Parameters

    aName
    The name of the preferences to remove.

    Exceptions thrown

    NS_ERROR_ILLEGAL_VALUE
    If aName is null or an empty string.

    setPref()

    Sets the value of a preference for a particular URI.

    Note: Prior to Gecko 2.0, the site could only be specified by nsIURI. Now a string can be used as well.

    void setPref(
      in nsIVariant aGroup,
      in AString aName,
      in nsIVariant aValue
    );
    

    Parameters

    aGroup
    The group for which to set a preference; this may be specified as either a URI or as a string; in either case, the group consists of all sites matching the hostname portion of the specified URI. Specify null to set the preference in the global preference space; those preferences apply to all sites.
    aName
    The name of the preference whose value is to be set.
    aValue
    The value to assign to the preference.

    Exceptions thrown

    NS_ERROR_ILLEGAL_VALUE
    If aGroup is not a string, nsIURI, or null. Or if aName is null or an empty string

    See also

    Document Tags and Contributors

    Contributors to this page: Sheppy, fscholz, trevorh, MykMelez, Kohei, kscarfone
    Last updated by: Sheppy,