/*
DOM XML ticker- © Dynamic Drive (www.dynamicdrive.com)
For full source code, 100's more DHTML scripts, and Terms Of Use, visit http://www.dynamicdrive.com
Credit MUST stay intact
*/

//Container for ticker. Modify its STYLE attribute to customize style:
var item_id_prefix='listFirstChild_0_'
var container_id='list_0'
var tickercontainer='<div class="compbody" id="' + container_id + '"></div>'
var items_class = 'content'
var container = ''

//Specify path to xml file
var xmlsource="components/news_feed_xml.jsp"
var parent_element="news_data"

var item_count = 0
var curr_item = 0
var change = 1 //pixels to move per frame
var do_scroll = true //animation controller

////No need to edit beyond here////////////

//load xml file
if (window.ActiveXObject)
	var xmlDoc = new ActiveXObject("Microsoft.XMLDOM");
else if (document.implementation && document.implementation.createDocument)
	var xmlDoc= document.implementation.createDocument("","doc",null);

if (typeof xmlDoc!="undefined"){
document.write(tickercontainer)
container = document.getElementById(container_id)
xmlDoc.load(xmlsource)
}

if (window.ActiveXObject) {
	fetchxml();
} else if (typeof xmlDoc!="undefined") {
	window.onload = function() {
		init_ticker();
	}
}

//Regular expression used to match any non-whitespace character
var notWhitespace = /\S/

function init_ticker(){
//Cache "messages" element of xml file
	news_ticker=xmlDoc.getElementsByTagName(parent_element)[0]

//REMOVE white spaces in XML file. Intended mainly for NS6/Mozilla
	for (i=0;i<news_ticker.childNodes.length;i++){
		 if ((news_ticker.childNodes[i].nodeType == 3)&&(!notWhitespace.test(news_ticker.childNodes[i].nodeValue))) {
		 news_ticker.removeChild(news_ticker.childNodes[i])
		 i--
		 }
	}
	prepare_items() //create empty divs for each news item
	render_items()   //render the items
	curr_item=1
	the_item=''
	scroll()
}

function prepare_items() {
	item_count=news_ticker.childNodes.length
	item_set = ''
	for (i=0;i<item_count;i++){
		prepare_item(i)
	}
	document.getElementById(container_id).innerHTML=item_set
}

function prepare_item(id) {
	var target_id = id
	var item_object = news_ticker.childNodes[target_id]
	var item_id = item_object.getAttribute('id')
	item_set += '<div class="'
	item_set += items_class
	item_set += '" id="'
	item_set += item_id_prefix 
	item_set += item_id
	item_set += '">empty node</div>'
}

function render_items(){
	for (i=0;i<item_count;i++){
		render_item(i)
	}
}

function render_item(id){
	var target_id = id
	var item_object = news_ticker.childNodes[target_id]
	var item_id = item_object.getAttribute('id');
	var item_hdr = '<div class="hdr"><a href="' + item_object.getElementsByTagName('link')[0].firstChild.nodeValue + '">' + item_object.getElementsByTagName('hdr')[0].firstChild.nodeValue + '</a></div>'
	var item_date = '<div class="date">' + item_object.getElementsByTagName('date')[0].firstChild.nodeValue + '</div>'
	var item_teaser = '<div class="teaser">' + item_object.getElementsByTagName('teaser')[0].firstChild.nodeValue + '</div>'
	var the_item = item_date + item_hdr + item_teaser;
	//Rotate msg and display it in DIV:
	document.getElementById(item_id_prefix + '' + item_id).innerHTML=the_item
	the_item=''
}

function fetchxml(){
	if (xmlDoc.readyState==4) {
		window.onload = function() {
			init_ticker();
		}
	} else {
		setTimeout("fetchxml()",10);
	}
}
container.onmouseover=function() {
	do_scroll = false;
}

container.onmouseout=function() {
	do_scroll = true;
}

function scroll(){
	var to_focus = news_ticker.childNodes[curr_item-1]
	var focus_id = to_focus.getAttribute('id')
	var focus_item = document.getElementById(item_id_prefix + '' + focus_id)
	var on_complete = function() {
		if (curr_item<item_count) {
			shift_item(focus_item)
			curr_item++
		} else if (curr_item == item_count){ 
			shift_item(focus_item)
			curr_item=1
		}
		scroll()
	}
	scroll_item(focus_item, on_complete);         
}

function scroll_item(item, on_complete){
	var target_item = item
	if (target_item.style.top==""){
		target_item.style.top=0+"px"
	}
	if(do_scroll) {
		target_item.style.top=parseInt(target_item.style.top)-change+"px";
		target_item.style.marginBottom = parseInt(target_item.style.top) + 'px';
	}
	if (parseInt(target_item.style.top)>-parseInt(target_item.clientHeight+change) || target_item.clientHeight == 0){
		setTimeout(function(){this.scroll_item(target_item, on_complete)}, 50)

	} else {
		on_complete();
	}
}

function shift_item(element) {
	//take the item, move it to the end of the div list
	container.appendChild(element);   
	//clear the top and marginBottom styles
	element.style.top = '0px';
	element.style.marginBottom = '0px';
}