getElementById vs. querySelector

JavaScript performance comparison

Revision 123 of this test case created by

Preparation code

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

<p id="foo">Foo</p>
<p id="bar">Bar</p>
<p id="baz">Baz</p>
<form id="f"><input id="input_1" ca-bind="input"></form>
      
<script>
Benchmark.prototype.setup = function() {
  var idSelectorRegexp = /^#[a-zA-Z]+[a-zA-Z0-9_\-]*$/;
  
  var select = function(query){
    // pure ID selector?
    if (idSelectorRegexp.test(query))
      return document.getElementById(query.slice(1));
    else
      return document.querySelector(query);
  };
  
  var form = document.getElementById("f");

};
</script>

Preparation code output

<p id="foo">Foo</p> <p id="bar">Bar</p> <p id="baz">Baz</p> <form id="f"><input id="input_1" ca-bind="input"></form>

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Testing in CCBot 2.0.0 / Other 0.0.0
Test Ops/sec
getElementById
var bar = document.getElementById("bar");
pending…
querySelector
var bar = document.querySelector("#bar");
pending…
mapping to getElementById
var bar = select("#bar");
pending…
jQuery
var bar = $(document).find('#bar');
pending…
element.querySelector
var inpt = form.querySelector("#input_1")
pending…
element.querySelector custom
var inpt = form.querySelectorAll("*[ca-bind]")
pending…
element id
var bar = bar;
pending…

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Revisions

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0 Comments

Foo

Bar

Baz