File: resources/roll_menu.js

	/************************************************************************************************************
	(C) www.dhtmlgoodies.com, October 2005
	
	This is a script from www.dhtmlgoodies.com. You will find this and a lot of other scripts at our website.	
	
	Terms of use:
	You are free to use this script as long as the copyright message is kept intact. However, you may not
	redistribute, sell or repost it without our permission.
	
	Thank you!
	
	www.dhtmlgoodies.com
	Alf Magne Kalleland
	
	************************************************************************************************************/	
	var expandFirstItemAutomatically = 1;
	
	var dhtmlgoodies_slmenuObj;
	var divToScroll = false;
	var ulToScroll = false;	
	var divCounter = 1;
	var otherDivsToScroll = new Array();
	var divToHide = false;
	var parentDivToHide = new Array();
	var ulToHide = false;
	var offsetOpera = 0;
	if(navigator.userAgent.indexOf('Opera')>=0)offsetOpera=1;	
	var slideMenuHeightOfCurrentBox = 0;
		
	function popMenusToShow()
	{
		var obj = divToScroll;
		var endArray = new Array();
		while(obj && obj.tagName!='BODY'){
			if(obj.tagName=='DIV' && obj.id.indexOf('slideDiv')>=0){
				var objFound = -1;
				for(var no=0;no<otherDivsToScroll.length;no++){
					if(otherDivsToScroll[no]==obj){
						objFound = no;		
					}					
				}	
				if(objFound>=0){
					otherDivsToScroll.splice(objFound,1);	
				}		
			}	
			obj = obj.parentNode;
		}	
	}

	
	
	function showSubMenu(e,inputObj)
	{
		if(this && this.tagName)inputObj = this.parentNode;
		if(inputObj && inputObj.tagName=='LI'){
			divToScroll = inputObj.getElementsByTagName('DIV')[0];
			for(var no=0;no<otherDivsToScroll.length;no++){
				if(otherDivsToScroll[no]==divToScroll)return;
			}			
		}
		hidingInProcess = false;
		if(otherDivsToScroll.length>0){
			if(divToScroll){				
				if(otherDivsToScroll.length>0){
					popMenusToShow();
				}
				if(otherDivsToScroll.length>0){	
					autoHideMenus();
					hidingInProcess = true;
				}
			}	
		}		
		if(divToScroll && !hidingInProcess){
			divToScroll.style.display='';
			otherDivsToScroll.length = 0;
			otherDivToScroll = divToScroll.parentNode;
			otherDivsToScroll.push(divToScroll);	
			while(otherDivToScroll && otherDivToScroll.tagName!='BODY'){
				if(otherDivToScroll.tagName=='DIV' && otherDivToScroll.id.indexOf('slideDiv')>=0){
					otherDivsToScroll.push(otherDivToScroll);					
				}
				otherDivToScroll = otherDivToScroll.parentNode;
			}			
			ulToScroll = divToScroll.getElementsByTagName('UL')[0];
			if(divToScroll.style.height.replace('px','')=='0')scrollDownSub();
		}	
	}
	
	

	function autoHideMenus()
	{
		if(otherDivsToScroll.length>0){
			divToHide = otherDivsToScroll[otherDivsToScroll.length-1];
			parentDivToHide.length=0;
			var obj = divToHide.parentNode.parentNode.parentNode;
			while(obj && obj.tagName=='DIV'){			
				if(obj.id.indexOf('slideDiv')>=0)parentDivToHide.push(obj);
				obj = obj.parentNode.parentNode.parentNode;
			}
			var tmpHeight = (divToHide.style.height.replace('px','')/1 - slideMenuHeightOfCurrentBox);
			if(tmpHeight<0)tmpHeight=0;
			if(slideMenuHeightOfCurrentBox)divToHide.style.height = tmpHeight  + 'px';
			ulToHide = divToHide.getElementsByTagName('UL')[0];
			slideMenuHeightOfCurrentBox = ulToHide.offsetHeight;
			scrollUpMenu();		
		}else{
			slideMenuHeightOfCurrentBox = 0;
			showSubMenu();			
		}
	}

	
	function scrollUpMenu()
	{
		
		var height = divToHide.offsetHeight;
		height-=15;
		if(height<0)height=0;
		divToHide.style.height = height + 'px';
		//ulToHide.style.top = height - ulToHide.offsetHeight + 'px';		
		for(var no=0;no<parentDivToHide.length;no++){	
			parentDivToHide[no].style.height = parentDivToHide[no].getElementsByTagName('UL')[0].offsetHeight + 'px';
		}
		if(height>0){
			setTimeout('scrollUpMenu()',5);
		}else{
			divToHide.style.display='none';
			otherDivsToScroll.length = otherDivsToScroll.length-1;
			autoHideMenus();			
		}
	}	
	
	function scrollDownSub()
	{
		if(divToScroll){			
			var height = divToScroll.offsetHeight/1;
			var offsetMove =Math.min(15,(ulToScroll.offsetHeight - height));
			height = height +offsetMove ;
			divToScroll.style.height = height + 'px';
			//ulToScroll.style.top = (height - ulToScroll.offsetHeight + offsetOpera) + 'px';				
			for(var no=1;no<otherDivsToScroll.length;no++){
				var tmpHeight = otherDivsToScroll[no].offsetHeight/1 + offsetMove;
				otherDivsToScroll[no].style.height = tmpHeight + 'px';
			}			
			if(height<ulToScroll.offsetHeight)setTimeout('scrollDownSub()',5); else {
				divToScroll = false;
				ulToScroll = false;
			}
		}
	}
		
	function initSubItems(inputObj,currentDepth)
	{		
		divCounter++;		
		var div = document.createElement('DIV');	// Creating new div		
		div.style.overflow = 'hidden';	
		div.style.position = 'relative';
		div.style.display='none';
		div.style.height = '0px';
		div.id = 'slideDiv' + divCounter;
		div.className = 'slideMenuDiv' + currentDepth;		
		inputObj.parentNode.appendChild(div);	// Appending DIV as child element of <LI> that is parent of input <UL>		
		div.appendChild(inputObj);	// Appending <UL> to the div
		var menuItem = inputObj.getElementsByTagName('LI')[0];
		while(menuItem){
			if(menuItem.tagName=='LI'){
				var aTag = menuItem.getElementsByTagName('A')[0];
				aTag.className='slMenuItem_depth'+currentDepth;	
				var subUl = menuItem.getElementsByTagName('UL');
				if(subUl.length>0){
					initSubItems(subUl[0],currentDepth+1);					
				}
				aTag.onclick = showSubMenu;				
			}			
			menuItem = menuItem.nextSibling;						
		}		
	}
	
	function initSlideDownMenu()
	{
		dhtmlgoodies_slmenuObj = document.getElementById('dhtmlgoodies_slidedown_menu');
		var mainUl = dhtmlgoodies_slmenuObj.getElementsByTagName('UL')[0];		
		var mainMenuItem = mainUl.getElementsByTagName('LI')[0];
		mainItemCounter = 1;
		while(mainMenuItem){			
			if(mainMenuItem.tagName=='LI'){
				var aTag = mainMenuItem.getElementsByTagName('A')[0];
				aTag.className='slMenuItem_depth1';	
				var subUl = mainMenuItem.getElementsByTagName('UL');
				if(subUl.length>0){
					mainMenuItem.id = 'mainMenuItem' + mainItemCounter;
					initSubItems(subUl[0],2);
					aTag.onclick = showSubMenu;
					mainItemCounter++;
				}				
			}			
			mainMenuItem = mainMenuItem.nextSibling;	
		}		
		if(expandFirstItemAutomatically>0){
			if(document.getElementById('mainMenuItem' + expandFirstItemAutomatically))showSubMenu(false,document.getElementById('mainMenuItem' + expandFirstItemAutomatically));
		}		
	}
	
	window.onload = initSlideDownMenu;