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It surprised me that Sizzle (the selector engine jQuery uses) comes with a built-in :nth-child() selector, but lacks an :nth-of-type() selector.
To illustrate the difference between :nth-child() and :nth-of-type() and to illustrate the problem, consider the following HTML document:
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>:nth-of-type() in Sizzle/jQuery?</title>
<style>
body p:nth-of-type(2n) { background: red; }
</style>
</head>
<body>
<p>The following CSS is applied to this document:</p>
<pre>body p:nth-of-type(2n) { background: red; }</pre>
<p>This is paragraph #1.</p>
<p>This is paragraph #2. (Should be matched.)</p>
<p>This is paragraph #3.</p>
<p>This is paragraph #4. (Should be matched.)</p>
<div>This is not a paragraph, but a <code>div</code>.</div>
<p>This is paragraph #5.</p>
<p>This is paragraph #6. (Should be matched.)</p>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.4/jquery.min.js"></script>
<script>
$(function() {
// The following should give every second paragraph (those that had red backgrounds already after the CSS was applied) an orange background.
// $('body p:nth-of-type(2n)').css('background', 'orange');
});
</script>
</body>
</html>
Since Sizzle uses the browser-native querySelector() and querySelectorAll() methods if those are present (i.e. in browsers that already implement the Selectors API), stuff like $('body p:nth-child'); will of course work. It won’t work in older browsers though, because Sizzle has no fallback method for this selector.
Is it possible to easily add the :nth-of-type() selector to Sizzle, or to implement it in jQuery (by using the built-in :nth-child() selector, perhaps)? A custom selector with parameters would be nice.
Test case - (check in IE or rename the selector)
You can of course add even & odd too:
the jQuery plugin moreSelectors has support for nth-of-type (and many other selectors). I suggest either using that, or simply implement a simple plugin that only implements the exact selectors you need. You should be able to copy-paste code from there.
Happy hacking!
I can't pretend to know how nth-of-type is implemented, but jQuery does provide a mechanism by which you can create your own custom selector.
The following question deals with custom selectors, and may provide a useful insight to you
What useful custom jQuery selectors have you written?