Too many events

JavaScript performance comparison

Test case created

Info

<div id="foo"></div> <div id="bar"></div>

Preparation code

<script src="//ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
 
<script>
Benchmark.prototype.setup = function() {
    var $foo = $('#foo'), $bar = $('#bar'), dummy, dimmy;
    for(var i=0; i<50; ++i) {
      dummy = $('<div>').attr('id', 'dummy-'+i).attr('number', i).addClass('dummy').appendTo($foo);
      $('#foo #dummy-'+i).on('click', function() {
        console.log(i);
      })
   
      dimmy = $('<div>').attr('id', 'dimmy-'+i).attr('number', i).addClass('dimmy').appendTo($bar);
    }
   
    $('#bar .dimmy').on('click', function(evt) {
      console.log(this.getAttribute('number'));
    })
};

Benchmark.prototype.teardown = function() {
    $foo.empty();
    $bar.empty();
};
</script>

Preparation code output

Test runner

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Testing in unknown unknown
Test Ops/sec
Many delegates
$('#dummy-' + Math.floor( Math.random() * 50 ) ).click();
pending…
Single event
$('#dimmy-' + Math.floor( Math.random() * 50 ) ).click()
pending…

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