Monday, February 23rd, 2009
Watching Prototype events and a nice little tip
<>p>Kangax shows a nice use of Prototype as he writes a tip to let you see your Prototype based events as they run in your application. A nice little view.He also realized that the core piece of the bookmarklet is actually a nice view of the power of Prototype as a library:
JAVASCRIPT:
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$H(Event.cache).inject(0, function(m, p) {
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m += $H(p.value).values().flatten().size();
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return m;
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});
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3 rating from 24 votes
I believe kangax’s script will give an inaccurate result because it doesn’t filter out the `element` object in the cache.
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Here is a corrected version that doesn’t use `inject` and, as a result, is ~1,107% faster.
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http://dl.getdropbox.com/u/513327/JavaScript/hash_inect_test/index.html
Note: The Event.cache `element` property is only on some edge versions of Prototype from ~August 08.
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One example of this is found on Lighthouse pages, http://prototype.lighthouseapp.com/projects/8886-prototype .