/*
+ * DOM event listener abstraction layer
+ * @module event
+ * @submodule event-base
+ */
+
+(function() {
+
+
+// Unlike most of the library, this code has to be executed as soon as it is
+// introduced into the page -- and it should only be executed one time
+// regardless of the number of instances that use it.
+
+var GLOBAL_ENV = YUI.Env,
+
+ C = YUI.config,
+
+ D = C.doc,
+
+ POLL_INTERVAL = C.pollInterval || 40,
+
+ _ready = function(e) {
+ GLOBAL_ENV._ready();
+ };
+
+ if (!GLOBAL_ENV._ready) {
+
+ GLOBAL_ENV._ready = function() {
+ if (!GLOBAL_ENV.DOMReady) {
+ GLOBAL_ENV.DOMReady=true;
+
+ // Remove the DOMContentLoaded (FF/Opera/Safari)
+ if (D.removeEventListener) {
+ D.removeEventListener("DOMContentLoaded", _ready, false);
+ }
+ }
+ };
+
+ // create custom event
+
+/*! DOMReady: based on work by: Dean Edwards/John Resig/Matthias Miller/Diego Perini */
+
+ // Internet Explorer: use the readyState of a defered script.
+ // This isolates what appears to be a safe moment to manipulate
+ // the DOM prior to when the document's readyState suggests
+ // it is safe to do so.
+ if (navigator.userAgent.match(/MSIE/)) {
+
+ if (self !== self.top) {
+ document.onreadystatechange = function() {
+ if (document.readyState == 'complete') {
+ document.onreadystatechange = null;
+ _ready();
+ }
+ };
+ } else {
+
+ GLOBAL_ENV._dri = setInterval(function() {
+ try {
+ // throws an error if doc is not ready
+ document.documentElement.doScroll('left');
+ clearInterval(GLOBAL_ENV._dri);
+ GLOBAL_ENV._dri = null;
+ _ready();
+ } catch (ex) {
+ }
+ }, POLL_INTERVAL);
+ }
+
+ // FireFox, Opera, Safari 3+: These browsers provide a event for this
+ // moment.
+ } else {
+ D.addEventListener("DOMContentLoaded", _ready, false);
+ }
+
+ /////////////////////////////////////////////////////////////
+ }
+
+})();
+