Parsing and serializing XML: Difference between revisions
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Mozilla [https://bugzilla.mozilla.org/show_bug.cgi?id=155749 doesn't support] the W3C's [http://www.w3.org/TR/DOM-Level-3-LS/load-save.html Document Object Model Load and Save] at this moment, so the easiest way to serialize and deserialize DOM trees is to use the following Mozilla-specific interfaces: | Mozilla [https://bugzilla.mozilla.org/show_bug.cgi?id=155749 doesn't support] the W3C's [http://www.w3.org/TR/DOM-Level-3-LS/load-save.html Document Object Model Load and Save] at this moment, so the easiest way to serialize and deserialize DOM trees is to use the following Mozilla-specific interfaces: | ||
*[http:// | *[http://xulplanet.com/references/xpcomref/ifaces/nsIDOMSerializer.html XMLSerializer] to serialize '''DOM trees to strings or to files''' | ||
*[http:// | *[http://xulplanet.com/references/objref/DOMParser.html DOMParser] to parse XML from '''strings into DOM trees''' | ||
*[http:// | *[http://xulplanet.com/references/objref/XMLHttpRequest.html XMLHttpRequest] to parse XML from '''files into DOM trees'''. Although <code>DOMParser</code> does have a method named <code>parseFromStream()</code>, it's actually easier to [[XMLHttpRequest|use XMLHttpRequest]] which works for remote '''and''' local files. | ||
==Serializing DOM trees to strings== | ==Serializing DOM trees to strings== |
Revision as of 20:28, 10 March 2005
Mozilla doesn't support the W3C's Document Object Model Load and Save at this moment, so the easiest way to serialize and deserialize DOM trees is to use the following Mozilla-specific interfaces:
- XMLSerializer to serialize DOM trees to strings or to files
- DOMParser to parse XML from strings into DOM trees
- XMLHttpRequest to parse XML from files into DOM trees. Although
DOMParser
does have a method namedparseFromStream()
, it's actually easier to use XMLHttpRequest which works for remote and local files.
Serializing DOM trees to strings
First, create a DOM tree using code like this.
Now, let's serialize doc
— the DOM tree — to a string:
var serializer = new XMLSerializer(); var xml = serializer.serializeToString(doc);
Serializing DOM trees to files
First, create a DOM tree using code like this.
Now, let's serialize doc
— the DOM tree — to a file (you can read more about using files in Mozilla here):
var serializer = new XMLSerializer(); var foStream = Components.classes["@mozilla.org/network/file-output-stream;1"] .createInstance(Components.interfaces.nsIFileOutputStream); var file = Components.classes["@mozilla.org/file/directory_service;1"] .getService(Components.interfaces.nsIProperties) .get("ProfD", Components.interfaces.nsIFile); // get profile folder file.append("extensions"); // extensions sub-directory file.append("{5872365E-67D1-4AFD-9480-FD293BEBD20D}"); // GUID of your extension file.append("myXMLFile.xml"); // filename foStream.init(file, 0x02 | 0x08 | 0x20, 0664, 0); // write, create, truncate serializer.serializeToFile(doc, foStream, "IS0-8859-1"); // rememeber, doc is the DOM tree foStream.close();
Parsing strings into DOM trees
var theString='<a id="a"><b id="b">hey!</b></a>'; var parser = new DOMParser(); var dom = parser.parseFromString(theString, "text/xml");
Parsing files into DOM trees
Coming soon