Inconsistent results with [name="name"] selectors (also breaks .has)
|Reported by:||rgibson@…||Owned by:||rgibson@…|
jQuery delivers inconsistent results with [name="name"] selectors because of optimization-driven dependence upon un-normalized results from document.getElementsByName (defined in DOM Level 2), whose behavior in Internet Explorer differs between "quirks" and "standards" modes (in "quirks" mode, the method will only return form controls: elements with tag names like INPUT/SELECT/etc.). Specifically, calls to jQuery with default/document scope will fail to include non-form controls on IE if and only if there is no DOCTYPE declaration and there are form controls that also match the selector.
Chrome, Firefox, and Safari do not limit the potential set of matching elements for document.getElementsByName regardless of DOCTYPE, and so do not exhibit this bug.
I've created demonstration pages for both no DOCTYPE and simple DOCTYPE cases. Expected behavior is for the following expressions to always return all elements with a matching name attribute, but observed behavior is that the simplest one returns only form controls when the browser is IE and there is no DOCTYPE declaration and there is at least one form control that matches the selector.
- unscoped: $('*[name="named"]')
- workaround: $('*:not([name!="named"])')
- scoped: $('*[name="named"]', '#context')
Note that scoping to document.body would also avoid this bug because getElementsByName is only defined on the document level (see below for relevance), but unfortunately jQuery's has method is implemented with precisely the kind of unscoped call to jQuery that is problematic.
A possible fix would be something like jQuery.support.getByName (true if document.getElementsByName can return elements of any tag name) and corresponding tweaking of Sizzle.selectors.find.NAME (accessed in Sizzle.find as Expr.find[ type ] at line 4129 of the uncompressed jQuery-1.7.js) to always return null when getElementsByName is restricted. That is already the return value now when context is not a document, or when context is a document but getElementsByName returns an empty list, making this a very minor change.
Such a fix would add fewer than 100 bytes.
Change History (7)
comment:2 Changed 5 years ago by timmywil
- Component changed from unfiled to selector
- Milestone changed from None to 1.next
- Priority changed from undecided to low
- Status changed from new to open
comment:6 Changed 5 years ago by timmywil
- Milestone changed from 1.next to 1.8
- Owner set to rgibson@…
- Status changed from open to assigned