appendChild vs. DocumentFragment vs. innerHTML

JavaScript performance comparison

Revision 23 of this test case created

Info

Comparing three different ways to dynamically insert content into the DOM.

Preparation code

<div id="test"></div>
<script>
  function text(node, txt) {
   node.appendChild(document.createTextNode(txt));
   return node;
  }
 
  var o = document.getElementById('test'),
      aElms = [
   text(document.createElement('b'), 'Links:'), document.createTextNode(' '), text(document.createElement('a'), 'Link A'), document.createTextNode(' | '), text(document.createElement('a'), 'Link B'), document.createTextNode(' | '), text(document.createElement('a'), 'Link C'), document.createElement('hr')];
</script>

Preparation code output

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Testing in unknown unknown
Test Ops/sec
appendChild
while (o.lastChild) {
  o.removeChild(o.lastChild);
}

for (var i = 0, imax = aElms.length; i < imax; i++) {
 o.appendChild(aElms[i].cloneNode(true));
}

var x = window.getComputedStyle(o);
pending…
DocumentFragment
oFrag = document.createDocumentFragment();
for (var i = 0, imax = aElms.length; i < imax; i++) {
 oFrag.appendChild(aElms[i]);
}

while (o.lastChild) {
  o.removeChild(o.lastChild);
}
o.appendChild(oFrag.cloneNode(true));

var x = window.getComputedStyle(o);
pending…
innerHTML
o.innerHTML = '<b>Links:</b> <a>Link A</a> | <a>Link B</a> | <a>Link C</a><hr>';

var x = window.getComputedStyle(o);
pending…

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