designoir

/**
 * function whenDOMReady
 * Copyright (C) 2006-2007 Dao Gottwald
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * Contact information:
 *   Dao Gottwald  <dao at design-noir.de>
 *
 * @version  1.3
 * @url      http://design-noir.de/webdev/JS/whenDOMReady/
 */

function whenDOMReady(fn) {
	var f = arguments.callee;
	if ("listeners" in f) { // already initialized
		if (f.listeners) // still loading
			f.listeners.push(fn);
		else // DOM is ready
			fn();
		return;
	}
	f.listeners = [fn];
	f.callback = function() {
		removeEvent(window, "load", f.callback);
		if (document.removeEventListener)
			document.removeEventListener("DOMContentLoaded", f.callback, false);
		if (f.listeners) {
			while (f.listeners.length)
				f.listeners.shift()();
			f.listeners = null;
		}
	};
	if (document.addEventListener)
		document.addEventListener("DOMContentLoaded", f.callback, false);
	/*@cc_on @if (@_win32) else
		document.write("<script defer src=\"//:\""+
		               " onreadystatechange=\"if (this.readyState == 'complete')"+
		               " whenDOMReady.callback();\"><\/script>");
	@end @*/
	addEvent(window, "load", f.callback);
}

function init() {
	// do fancy stuff with the document, like:
	var links = document.getElementsByTagName('a');
	// ...
}
whenDOMReady (init);

// we can enqueue multiple functions
whenDOMReady (function() {
	var foo = document.getElementById('special-element');
	// ...
});