How to parse HTML from JavaScript in Firefox?

What is the best way to parse (get a DOM tree of) a HTML result of XmlHttpRequest in Firefox?

EDIT:

I do not have the DOM tree, I want to acquire it.

XmlHttpRequest's "responseXML" works only when the result is actual XML, so I have only responseText to work with.

The innerHTML hack doesn't seem to work with a complete HTML document (in <html></html>). - turns out it works fine.

Answers:

Answer

innerHTML should work just fine, e.g.

// This would be after the Ajax request:
var myHTML = XHR.responseText;
var tempDiv = document.createElement('div');
tempDiv.innerHTML = myHTML.replace(/<script(.|\s)*?\/script>/g, '');

// tempDiv now has a DOM structure:
tempDiv.childNodes;
tempDiv.getElementsByTagName('a'); // etc. etc.
Answer

At least for newer Firefox versions, an easier way is or will soon be available.

https://developer.mozilla.org/en/HTML_in_XMLHttpRequest indicates that starting from FF11 it will be possible to ask for a DOM directly from the XHR by setting the responseType attribute to "document". At that point, the HTML will be parsed and the DOM stuck into responseXML as for an XML document.

Answer

You can use the DOMParser to parse HTML - even tag soup:

var parser = new DOMParser()
parser.parseFromString('<!DOCTYPE html><html><head><title>hi</title></head><body><p>hello<b>world</b></p>', 'text/html')

I don't know if it handles partial table markup well, but it should create the same DOM the browser itself does for pretty much any markup.

Answer

Loop up the responseXML property of the XMLHttpRequest object. Furthermore, if you use innerHTML to append the responseText of an HTML-formatted response, the browser will parse the text and assemble it within the DOM all before even appending it into the document flow.

Answer

If your data is XHTML, so it's valid XML, then DOMParser (Mozilla) or loadXML (IE) may help. If not, I can't think of anything better than stripping the and and then passing it to a 's innerHtml.

See 21.1.3 in Flanagan's Javascript guide (5th edition).

Colin

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