getElementById vs. getElementsByClassName vs. querySelector vs. jQuery vs xpath

JavaScript performance comparison

Revision 94 of this test case created by Mario Valle

Info

Changes to rev 26 (rev 27 is worse):
- repositioning xpath
- remove foo + checks for it (search for selecting elem by id once is enough)
- remove getElementById("poo") in querySelector (Class) & jQuery Class Selector for a true comparison of the algorithms.
- jQuery Class Selector -> jQuery w. querySelector
- added real jQuery ClassSelector

Preparation code

<script src="//ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js">
</script>
<p id="bar" class="my-bar">
  Bar
</p>
<div id="poo" class="my-poo">
  <div id="par" class="my-bar">
    <div id="paz" class="my-bar">
      <span id="baz" class="my-baz">
        Baz
      </span>
    </div>
  </div>
</div>

Preparation code output

Bar

Baz

Test runner

Warning! For accurate results, please disable Firebug before running the tests. (Why?)

Java applet disabled.

Testing in unknown unknown
Test Ops/sec
getElementById
var bar = document.getElementById("bar");
pending…
querySelector (ID)
var bar = document.querySelector("#bar");
pending…
jQuery ID Selector
var bar = $("#bar");
pending…
xpath eval
var bar = document.evaluate("//*[@id='bar']",document,null,9,null).singleNodeValue;
pending…
getElementsByClassName
var baz = document.getElementsByClassName("my-baz");
 
pending…
querySelector (Class)
var baz = document.querySelector(".my-baz");
 
pending…
jQuery ClassSelector
var baz = $(".my-baz");
 
pending…
jQuery w. querySelector
var baz = $(document.querySelector(".my-baz"));
pending…
jQuery w. getElementsById
var baz = $(document.getElementById("#bar"));
pending…
jQuery w. getElementsById no #
var baz = $(document.getElementById("bar"));
pending…

Compare results of other browsers

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:

0 comments

Add a comment