jQuery event delegation

JavaScript performance comparison

Revision 36 of this test case created by Aaron Forsander

Preparation code

<div id="parent"></div>
<div id="parent2"></div>
<script src="//ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js">
</script>
<script>
  Benchmark.prototype.setup = function() {
    $('#parent2').on('click', '.clickable', function() {
      $(this).toggleClass('active');
    });
  };

  Benchmark.prototype.teardown = function() {
    $('.clickable').remove();
  };
</script>

Preparation code output

Test runner

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

Java applet disabled.

Testing in unknown unknown
Test Ops/sec
no delegation
 
var $target = $("<div class='clickable'></div>").appendTo('#parent');
$target.on('click', function() {
  $(this).toggleClass('active');
});
$target.click();
 pending…
with delegation
 
var $target = $("<div class='clickable'></div>").appendTo('#parent2');
$target.click();
 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