jQuery Selectors

JavaScript performance comparison

Test case created by Asa Williams

Info

The different ways to select (context, pure selector, +find()) DOM elements using jQuery

Preparation code

<script src="//ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js">
</script>
<div>
  <ul id="list">
    <li class="first">
    </li>
    <li>
    </li>
  </ul>
</div>
<div class="first">
</div>
<script>
  var list = document.getElementById('list');
</script>

Preparation code output

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Testing in unknown unknown
Test Ops/sec
context
var $first = $('.first', list);
pending…
selector
var $first = $('#list .first');
pending…
context and find()
var $first = $(list).find('.first');
pending…
created context
var $first = $('.first', $('#list'));
pending…
selector and find
var $first = $('#list').find('.first');
pending…

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1 comment

Rob commented :

Wow, fantastic analytics, also check this resource out for creating your own jQuery selectors: http://www.websanova.com/tutorials/jquery/12-awesome-jquery-selector-extensions

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