Hi all,
I was trying to use qooxdoo in XHTML documents in order to
take advantage of native SVG support in Firefox and Opera, but
I encountered a few problems, manly because tagnames case in the
XHTML DOM is handled differently from the HTML DOM.
While the HTML specifications allow both uppercase and lowercase
tagnames, XHTML only allows lowercase tagnames, but in qooxdoo
tagnames references are sometimes lowercase (often, but not always, when
they are created) and sometimes uppercase (often when comparing
elements' tagName attribute or when calling getElementsByTagName()).
I made some tests with FireFox 1.5 and 2.0RC3 and Opera 9 and
concluded that:
- When the document type is HTML, both always return tag names in
uppercase and accept both uppercase and lowercase tag names as arguments
to getElementsByTagName() and createElement()
- When the document type is XHTML, both return tag names in their original
case (which should be lowercase as per XHTML specifications), the
argument to getElementsByTagName() must match the case of the tag
being searched for and tags created by createElement() must be lowercase
to work: this means that qooxdoo fails when an uppercase tag is
created or expected.
In addition, it seems both FireFox and Opera have a bug which
makes the document.write() call fail when the document type is XHTML:
- Firefox always raises the following exception:
"Object cannot be created in this context" code: "9" nsresult:
"0x80530009 (NS_ERROR_DOM_NOT_SUPPORTED_ERR)"
- Opera fails silently, that is it doesn't write anything, if
document.write()
is called while loading the document.
This means that the source build of an application fails to load, since
the includer script created by generator.py cannot add the <script>
tags needed to include the application and qooxdoo classes.
I prepared a patch which converts all tag names references
to lowercase: this should improve XHTML support while maintaining
HTML compatibility: I also suggest that, from now on, all new code
should follow these two guidelines:
Always use lowercase tag names when calling createElement()
or getElementsByTagName().
Always convert to lowercase the tagName attribute of elements before
comparing it; for example, write
el.tagName.toLowerCase() == "body" // This works both in XHTML and
HTML
instead of
el.tagName == "BODY" // This only works in HTML
The patch also changes generator.py so that the includer script first tries
document.write() and, if this fails, it creates script nodes using the
DOM interface.
I think it's important that qooxdoo be compatible with XHTML
documents, since XHTML is the natural evolution of HTML, and
working with XHTML will enable qooxdoo to take advantage of
of its new features; so, if you all agree, I will apply the patch to svn.
Cheers,
Alessandro
begin:vcard
fn:Alessandro Sala
n:Sala;Alessandro
email;internet:alessandro {dot} sala {at} mclink {dot} net
version:2.1
end:vcard
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