nsIURL 编辑

netwerk/base/public/nsIURL.idlScriptable This interface provides convenience methods that further break down the path portion of nsIURI. Inherits from: nsIURI Last changed in Gecko 9.0 (Firefox 9.0 / Thunderbird 9.0 / SeaMonkey 2.6)

 http://host/directory/fileBaseName.fileExtension?query
 http://host/directory/fileBaseName.fileExtension#ref
 http://host/directory/fileBaseName.fileExtension;param
            \          \                       /
             \          -----------------------
              \                   |          /
               \               fileName     /
                ----------------------------
                            |
                        filePath

You can get a nsIURL from an nsIURI, using the QueryInterface() method:

var myURI = Components.classes["@mozilla.org/network/io-service;1"]
                      .getService(Components.interfaces.nsIIOService)
                      .newURI("http://developer.mozilla.org", null, null);
try {
  var myURL = myURI.QueryInterface(Components.interfaces.nsIURL);
}
catch(e) {
  // the URI is not an URL
}

Or using instanceof:

if (myURI instanceof Components.interfaces.nsIURL) {
  // Your code here
}

 

Method overview

AUTF8String getCommonBaseSpec(in nsIURI aURIToCompare);

AUTF8String getRelativeSpec(in nsIURI aURIToCompare);

Attributes

Attribute	Type	Description
directory	AUTF8String	Directory portion of a URL. If the URL denotes a path to a directory and not a file, for example http://host/foo/bar/, then the Directory attribute accesses the complete /foo/bar/ portion, and the FileName is the empty string. If the trailing slash is omitted, then the Directory is /foo/ and the file is bar (that is this is a syntactic, not a semantic breakdown of the Path). And hence don't rely on this for something to be a definitely be a file. But you can get just the leading directory portion for sure. Some characters may be escaped.
fileBaseName	AUTF8String	File basename portion of a filename in a url. Some characters may be escaped.
fileExtension	AUTF8String	File extension portion of a filename in a url. If a file extension does not exist, the empty string is returned. Some characters may be escaped.
fileName	AUTF8String	File name portion of a URL. If the URL denotes a path to a directory and not a file, for example http://host/foo/bar/, then the Directory attribute accesses the complete /foo/bar/ portion, and the FileName is the empty string. Note that this is purely based on searching for the last trailing slash. And hence don't rely on this to be a definite file. Some characters may be escaped.
filePath	AUTF8String	Path including the directory and file portions of a URL. For example, the filePath of "http://host/foo/bar.html" is "/foo/bar.html". Some characters may be escaped.
param	AUTF8String	Parameters specified after the ; in the URL. Some characters may be escaped. Obsolete since Gecko 9.0 Note: This was removed in Gecko 9.0 (Firefox 9.0 / Thunderbird 9.0 / SeaMonkey 2.6) because the semicolon is not actually valid for this purpose and should not have been specially handled.
query	AUTF8String	Query portion (the part after the "?") of the URL. If there isn't one, an empty string is returned. Some characters may be escaped.
ref	AUTF8String	Reference portion (the part after the "#") of the URL. If there isn't one, an empty string is returned. Some characters may be escaped.

Methods

getCommonBaseSpec()

This method takes a uri and compares the two. The common uri portion is returned as a string. The minimum common uri portion is the protocol, and any of these if present: login, password, host and port If no commonality is found, "" is returned. If they are identical, the whole path with file/ref/etc. is returned. For file uris, it is expected that the common spec would be at least "file:///" since '/' is a shared common root.

Examples:

this.spec	aURIToCompare.spec	result
http://mozilla.org/	http://www.mozilla.org/	""
http://foo.com/bar/	ftp://foo.com/bar/	""
http://foo.com:8080/	http://foo.com/bar/	""
ftp://user@foo.com/	ftp://user:pw@foo.com/	""
ftp://foo.com/bar/	ftp://foo.com/bar	ftp://foo.com/
ftp://foo.com/bar/	ftp://foo.com/bar/b.html	ftp://foo.com/bar/
http://foo.com/a.htm	http://foo.com/b.htm	http://foo.com/
ftp://foo.com/c.htm#i	ftp://foo.com/c.htm	ftp://foo.com/c.htm
file:///a/b/c.html	file:///d/e/c.html	file:///

AUTF8String getCommonBaseSpec(
  in nsIURI aURIToCompare
);

Parameters

aURIToCompare

A URI to compare with

Return value

The common URI portion

getRelativeSpec()

This method takes a URI and returns a substring of this if it can be made relative to the uri passed in. If no commonality is found, the entire uri spec is returned. If they are identical, "" is returned. Filename, query, and so forth are always returned except when uris are identical.

AUTF8String getRelativeSpec(
  in nsIURI aURIToCompare
);

Parameters

aURIToCompare

A URI to compare with

Return value

The common URI portion

See also

• Code snippets:URI parsing
• nsIStandardURL