Friday, September 14, 2007

speed optimization for javascript innerHTML

/* This is much faster than using (el.innerHTML = value) when there are many
existing descendants, because in some browsers, innerHTML spends much longer
removing existing elements than it does creating new ones. */
function replaceHtml(el, html) {
var oldEl = (typeof el === "string" ? document.getElementById(el) : el);
/*@cc_on // Pure innerHTML is slightly faster in IE
oldEl.innerHTML = html;
return oldEl;
var newEl = oldEl.cloneNode(false);
newEl.innerHTML = html;
oldEl.parentNode.replaceChild(newEl, oldEl);
/* Since we just removed the old element from the DOM, return a reference
to the new element, which can be used to restore variable references. */
return newEl;

source article

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