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git-svn-id: svn://svn.silverstripe.com/silverstripe/open/modules/sapphire/trunk@92542 467b73ca-7a2a-4603-9d3b-597d59a354a9
33 lines
1.5 KiB
Plaintext
33 lines
1.5 KiB
Plaintext
h1. jQuery Selector
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h3. Selector tools and reverse mapping for jQuery
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* Parse and examine the AST for a selector
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* Calculate the specifity of a selector
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* Determine if a single element matches a selector ($().is equivilent) much faster that jQuery
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h3. Intro
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jQuery has an excellent CSS 3 selector engine built in called Sizzle. However, it's clear focus is on filtering a set of elements down to the set that matches a selector.
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jQuery.concrete has a usage pattern quite different from that optimized for by Sizzle. It reuses a small set of selectors (making a more complicated initial parsing step acceptable)
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and checks if a single element matches those selectors. In this case, Sizzle can be quite slow.
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h3. Usage
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Usual usage of jQuery selector:
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var sel = $.selector('#foo');
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sel.matches(element);
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element must be a raw DOM object, not a jQuery element, sequence of elements or anything else
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h3. Compatibility
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jQuery.selector aims to be 100% compatible with Sizzle (except a couple of corner cases, noted below). Sizzle implements most of the CSS 3 spec plus several extensions.
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One set of extensions Sizzle has is a set of pseudo-classes that filter the currently selected set. These pseudo-classes are ':first', ':last', ':even', ':odd', ':eq', ':nth', ':lt', ':gt'.
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These pseudo-classes are not supported in jQuery.selector, as they don't make sense when the working set is always a single element.
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jQuery.selector currently passes the jQuery selector unit test suite, with the exception of the psuedo-classes mentioned above
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