.live() @ handling

JavaScript performance comparison

Revision 18 of this test case created by Mohammad Salehe


The original "jQuery .live() vs .delegate() vs .on()" test doesn't measure event handling performance of these functions. It is more trying to benchmark selectors and attaching event handlers to different elements.

In real life usage, events handlers are attached once and event are fired many, so it is more important to benchmark handling performance.

These tests try to do so by attaching handlers in different ways at first and then measuring click fire event performance.

Preparation code

<script src="//ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js">
<div id="context">
    Some paragraph
  <a> Some Link! </a>
Benchmark.prototype.setup = function() {
    the_p = $("#context p");
    //$('p').live('click', $.noop);
    //$('a').live('click', $.noop);
    //$('p', $('#context')).live('click', $.noop);
    //$('a', $('#context')).live('click', $.noop);
    //$('#context').delegate('p', 'click', $.noop);
    //$('#context').delegate('a', 'click', $.noop);
    //$(document).delegate('p', 'click', $.noop);
    //$(document).delegate('a', 'click', $.noop);
    //$('#context').on('click', 'p', $.noop);
    //$('#context').on('click', 'a', $.noop);
    //$(document).on('click', 'p', $.noop);
    //$(document).on('click', 'a', $.noop);
    $("#context p").on('click', $.noop);
    $("#context a").on('click', $.noop);

Preparation code output

Some paragraph

Some Link!

Test runner

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