Too many events

JavaScript performance comparison

Test case created by

Preparation code

<script src="https://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

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Testing in CCBot 2.0.0 / Other 0.0.0
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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