hover vs mouseenter

JavaScript performance comparison

Test case created by Matt Mannello

Preparation code

<script src="//ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
<ul id="leftNav">
  <li class="selected">
    <ul class="leftSubNav">
      <li><a href="#">test</a></li>
    </ul>
  </li>
</ul>
 

Preparation code output

Test runner

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Java applet disabled.

Testing in unknown unknown
Test Ops/sec
live mouseenter mouseleave
/* set up hover functionality in subnav */
$('ul#leftNav li.selected ul.leftSubNav li:not([class*="selected"]) a').live('mouseenter mouseleave', function(e) {
 if (e.type == 'mouseover') {
  $(this).animate({
   left: '5px'
  }, 100);
 }
 else {
  $(this).animate({
   left: '0px'
  }, 100)
 }
});
pending…
mouseenter mouseleave
$('ul#leftNav li.selected ul.leftSubNav li:not([class*="selected"]) a').mouseenter(

function() {
 $(this).animate({
  left: '5px'
 }, 100);
}).mouseleave(

function() {
 $(this).animate({
  left: '0px'
 }, 100)
});
pending…
hover
$('ul#leftNav li.selected ul.leftSubNav li:not([class*="selected"]) a').hover(

function() {
 $(this).animate({
  left: '5px'
 }, 100);
}, function() {
 $(this).animate({
  left: '0px'
 }, 100);
});
pending…

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