StackOverflow2013

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plurals

PO
primarykey
Id
5910571
data
AcceptedAnswerId
0
AnswerCount
0
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CommentCount
0
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CreationDate
2011-05-06T11:13:30.540
FavoriteCount
0
LastActivityDate
2011-05-06T11:13:30.540
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LastEditorUserId
0
OwnerUserId
316723
ParentId
415629
PostTypeId
2
Score
9
ViewCount
0
LastEditorDisplayName
text
Body
As redsquare already mentioned, the selection algorithm changed in later jQuery versions (partly due to getElementsByClassName support). Additionally, I tested this with the most recent jQuery version to date (v1.6) and also added a test for document.getElementsByClassName for comparison (works at least in Firefox 4 and Chrome). The results in Firefox 4 were: <pre><code>// With 100 non-form elements: $('.myForm') : 366ms $('form.myForm') : 766ms document.getElementsByClassName('myForm') : 11ms // Without any other elements: $('.myForm') : 365ms $('form.myForm') : 583ms document.getElementsByClassName('myForm') : 11ms </code></pre> The accepted answer is outdated (and is still found by searching for something like "efficient way to find elements in jquery") and can mislead people, so I felt that I have to write this. Also, take a look at the time difference between jQuery and native browser selector functions. In jQuery 1.2.6 <code>$('.myForm')</code> was more than 300 times slower than <code>getElementsByClassName</code>, while in jQuery 1.6 it was only about 20 times slower, but still faster than <code>$('form.myForm')</code> (contrary to the outdated answer). Note: The results were obtained with Firefox 4 (similar results with Chrome). In Opera 10 querying with tag name is only slightly faster, but Opera also supports the much faster native <code>getElementsByClassName</code>. Test code: <a href="http://jsbin.com/ijeku5" rel="noreferrer">http://jsbin.com/ijeku5</a>
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1. POMost efficient way to find elements in jQuery
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1. POMost efficient way to find elements in jQuery
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