Parsing and serializing XML: Difference between revisions
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Mozilla [http://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://unstable.elemental.com/mozilla/build/latest/mozilla/extensions/dox/interfacensIDOMSerializer.html nsIDOMSerializer] to serialize '''DOM trees to strings or to files''' | *[http://unstable.elemental.com/mozilla/build/latest/mozilla/extensions/dox/interfacensIDOMSerializer.html nsIDOMSerializer] to serialize '''DOM trees to strings or to files''' | ||
*[http://unstable.elemental.com/mozilla/build/latest/mozilla/extensions/dox/interfacensIDOMParser.html nsIDOMParser] to | *[http://unstable.elemental.com/mozilla/build/latest/mozilla/extensions/dox/interfacensIDOMParser.html nsIDOMParser] to parse XML from '''strings into DOM trees''' | ||
*[http://unstable.elemental.com/mozilla/build/latest/mozilla/extensions/dox/interfacensIXMLHttpRequest.html nsIXMLHttpRequest] to | *[http://unstable.elemental.com/mozilla/build/latest/mozilla/extensions/dox/interfacensIXMLHttpRequest.html nsIXMLHttpRequest] to parse XML from '''files into DOM trees''' ([[Using XMLHttpRequest|read more]]). Although [http://unstable.elemental.com/mozilla/build/latest/mozilla/extensions/dox/interfacensIDOMParser.html nsIDOMParser] does have a method named [http://unstable.elemental.com/mozilla/build/latest/mozilla/extensions/dox/interfacensIDOMParser.html#a1 parseFromStream()], it's actually easier to use [http://unstable.elemental.com/mozilla/build/latest/mozilla/extensions/dox/interfacensIXMLHttpRequest.html nsIXMLHttpRequest] (yes, it works for local '''and''' remote files). | ||
==Serializing DOM trees to | ==Serializing DOM trees to strings== | ||
First, create a DOM tree using code [[ How to Create a DOM tree| like this]]. | First, create a DOM tree using code [[How to Create a DOM tree| like this]]. | ||
Now, let's serialize <code>doc</code> | Now, let's serialize <code>doc</code> — the DOM tree — to a string: | ||
<pre> | <pre> | ||
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==Serializing DOM trees to files== | ==Serializing DOM trees to files== | ||
First, create a DOM tree using code [[ How to Create a DOM tree| like this]]. | First, create a DOM tree using code [[How to Create a DOM tree| like this]]. | ||
Now, let's serialize <code>doc</code> | Now, let's serialize <code>doc</code> — the DOM tree — to a file (you can read more about using files in Mozilla [[Dev : Extensions : Example Code : File IO | here]]): | ||
<pre> | <pre> | ||
var serializer = new XMLSerializer(); | var serializer = new XMLSerializer(); | ||
var foStream = Components.classes["@mozilla.org/network/file-output-stream;1"].createInstance(Components.interfaces.nsIFileOutputStream); | var foStream = Components.classes["@mozilla.org/network/file-output-stream;1"] | ||
var file = Components.classes["@mozilla.org/file/ | .createInstance(Components.interfaces.nsIFileOutputStream); | ||
var file = Components.classes["@mozilla.org/file/directory_service;1"] | |||
file.append("extensions"); // extensions directory | .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("{5872365E-67D1-4AFD-9480-FD293BEBD20D}"); // GUID of your extension | ||
file.append("myXMLFile.xml"); // filename | file.append("myXMLFile.xml"); // filename | ||
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</pre> | </pre> | ||
== | ==Parsing strings into DOM trees== | ||
<pre> | <pre> | ||
var theString= | var theString='<a id="a"><b id="b">hey!</b></a>'; | ||
var parser = new DOMParser(); | var parser = new DOMParser(); | ||
var dom = parser.parseFromString(theString, "text/xml"); | var dom = parser.parseFromString(theString, "text/xml"); | ||
</pre> | </pre> | ||
== | ==Parsing files into DOM trees== | ||
Coming soon | Coming soon |
Revision as of 13:03, 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:
- nsIDOMSerializer to serialize DOM trees to strings or to files
- nsIDOMParser to parse XML from strings into DOM trees
- nsIXMLHttpRequest to parse XML from files into DOM trees (read more). Although nsIDOMParser does have a method named parseFromStream(), it's actually easier to use nsIXMLHttpRequest (yes, it works for local and remote 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