/*
	YUIDomCollapse by Christian Heilmann
	Version 1.0 / May 2007
	License: http://creativecommons.org/licenses/by/3.0/
	Homepage: http://onlinetools.org/tools/yuidomcollapse/
*/
// YUI Namespace
YAHOO.namespace('otorg');
YAHOO.otorg.DomCollapse = {
	init:function(){
		// shortcut for CSS properties
		var css = YAHOO.otorg.DomCollapse.css;
		if(typeof(css) !== 'undefined'){
			// get possible bookmark
			var bookmark = window.location.hash.replace('#','');
			// get all elements with the correct class
			var elms = YAHOO.util.Dom.getElementsByClassName(css.triggerClass);
			// loop over all the elements
			for(var i=0,j=elms.length;i<j;i++){
				// if the trigger is not a link
				if(elms[i].nodeName.toLowerCase()!=='a'){
					// get the next element
					var t = YAHOO.otorg.DomCollapse.getNext(elms[i]);
					if(t){
						// get the element's ID or create a new one
						var newID = t.id || YAHOO.util.Dom.generateId();
						t.setAttribute('id',newID);
						// create a new target and replace the element's
						// content with this new element
						var a = document.createElement('a');
						a.setAttribute('href','#'+newID);
						var c = elms[i].innerHTML;
						a.innerHTML = elms[i].innerHTML;
						elms[i].innerHTML = '';
						elms[i].appendChild(a);
						// if the ID is not the bookmark add the parent class 
						// to the trigger element and hide the element by 
						// adding the hide class
						if(newID !== bookmark){
							YAHOO.util.Dom.addClass(elms[i],css.parentClass);
							YAHOO.util.Dom.addClass(t,css.hideClass);
						// otherwise remove the hide class and add the 
						// open class to the trigger
						} else {
							YAHOO.util.Dom.addClass(elms[i],css.openClass);
							YAHOO.util.Dom.removeClass(t,css.hideClass);
						};
						// add a click handler to the link pointing to toggle()
						YAHOO.util.Event.on(a, 'click', YAHOO.otorg.DomCollapse.toggle);
					};
				// if the trigger is a link
				} else {
					// get the ID from the href attribute
					var newID = elms[i].href.replace(/.*#/,'');
					// grab the connected element, or the next sibling in case
					// it doesn't exist
					var t = document.getElementById(newID) || YAHOO.otorg.DomCollapse.getNext(elms[i]);
					if(t !== null){
						// re-set the href attribute to this element
						if(t.id !== newID){
							newID = t.id;
							elms[i].setAttribute('href','#'+newID);
						};
						// if the ID is not the bookmark, hide the element
						// and add the parent class
						if(newID !== bookmark){
							YAHOO.util.Dom.addClass(elms[i],css.parentClass);
							YAHOO.util.Dom.addClass(t,css.hideClass);
						// otherwise add the open class to the trigger
						} else {
							YAHOO.util.Dom.addClass(elms[i],css.openClass);
						};
						// add a click handler to the link pointing to toggle
						YAHOO.util.Event.on(elms[i], 'click', YAHOO.otorg.DomCollapse.toggle);
					};
				};
			};
			
		};
	},
	// tool method to get the next sibling that is not a text node
	getNext:function(o){
		var t = o.nextSibling;
		if(t){
			while(t.nodeType !== 1 && t.nextSibling){
				t = t.nextSibling;
			}
		}
		return t;	
	},
	// method to toggle the showing and hiding of the next element
	toggle:function(e){
		// shortcut for CSS object
		var css = YAHOO.otorg.DomCollapse.css;
		// if the element has the trigger class it is a link, otherwise 
		// it is a generated link by init()
		var parent = YAHOO.util.Dom.hasClass(this,css.triggerClass) ? this : this.parentNode;
		// grab the ID the link points to from the href attribute and get the element
		var id = this.href.replace(/.*#/,'');
		var t = document.getElementById(id);
		if(t !== undefined){
			// if the element is hidden (has the hide class) remove the hide 
			// class and swap parent for open and vice versa
			if(YAHOO.util.Dom.hasClass(t,css.hideClass)){
				YAHOO.util.Dom.removeClass(t,css.hideClass);
				YAHOO.util.Dom.replaceClass(parent,css.parentClass,css.openClass);
			} else {
				YAHOO.util.Dom.addClass(t,css.hideClass);
				YAHOO.util.Dom.replaceClass(parent,css.openClass,css.parentClass);
				// don't follow the link when you hide the element
				YAHOO.util.Event.preventDefault(e);
			};
		};
	}		
};
// If the DOM is ready, go for it.
YAHOO.util.Event.onDOMReady(YAHOO.otorg.DomCollapse.init);