Info

Compare performance of cached vs repeated element selections

Preparation code

<script src="//ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js">
</script>
<div id="top" class="mydiv">
  <p id="para_1" class="mytext">
    Paragraph one
  </p>
  <p id="para_2" class="mytext">
    Paragraph two
  </p>
  <p id="para_3" class="mytext">
    Paragraph three
  </p>
  <span id="span_1" class="mytext">
    Text in a span
  </span>
</div>
<p id="para_4" class="mytext">
  Paragraph four
</p>
<p id="para_5" class="mytext">
  Paragraph five
</p>
<p id="para_6" class="mytext">
  Paragraph six
</p>
<script>
  var parent_el = document.getElementById("top");
  var cached = jQuery(parent_el).find('p.mytext');
</script>

Preparation code output

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cached.css('color', '#ff0000');
cached.css('text-decoration', 'underline');
cached.css('background-color', '#eeeeee');

jQuery('#top').find('p.mytext').css('color', '#ff0000');
jQuery('#top').find('p.mytext').css('text-decoration', 'underline');
jQuery('#top').find('p.mytext').css('background-color', '#eeeeee');

cached.css('color', '#ff0000').css('text-decoration', 'underline').css('background-color', '#eeeeee');

cached.css({
  "color": "#ff0000",
  "text-decoration": "underline",
  "background-color": "#eeeeee"
});

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Revisions

You can edit these tests or add even more tests to this page by appending /edit to the URL. Here’s a list of current revisions for this page:

• Revision 1: published by Nilayan Sharma on 9th June 2011
• Revision 3: published on 7th October 2011
• Revision 4: published on 13th December 2011
• Revision 6: published on 15th January 2012
• Revision 7: published on 24th April 2012

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