[Webkit-unassigned] [Bug 47813] [HTML5] "form" attribute support for form control elements

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=47813


Kent Tamura <tkent at chromium.org> changed:

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--- Comment #6 from Kent Tamura <tkent at chromium.org>  2010-11-06 07:57:53 PST ---
(From update of attachment 73059)
View in context: https://bugs.webkit.org/attachment.cgi?id=73059&action=review

Yes, we need to update HTMLFormElement::m_associatedElements. However, HTMLFormElement::formElementIndex() doesn't work well with elements outside of the form.  We need to update formElementIndex() implementation, and should add test cases for form.elements[] order.

We need to handle cases that
 - A "form" attribute of a control is added or changed to another form, or removed.
 - An "id" attribute of a form element is added, changed, or removed.

You had better to take a look at the specification again.  It mentions many cases of changing form owner.
http://www.whatwg.org/specs/web-apps/current-work/multipage/association-of-controls-and-forms.html#attr-fae-form

Also, we need to take care of multiple form elements with identical ID values.  Document::getElementById() returns the first element in document-order in such case.  So <foo form=id1> should be associated to the first form with id=id1 in document-order.

> WebCore/html/HTMLFormElement.cpp:150
> +        for (Node* node = document()->traverseNextNode(); node; node = node->traverseNextNode()) {

This is not acceptable at all.  This code will introduce significant performance regression for existing pages.

I recommend to store a list (hash?) of form controls with id attribute to Document, like existing Document::registerFormElementWithState() and unregisterFormElementWithState(), and search the list for controls pointing this form element.

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