/*
 ======================================================================
 RSS JavaScript Ticker object
 Author: George at JavaScriptKit.com/ DynamicDrive.com
 Created: Feb 5th, 2006. Updated: Feb 5th, 2006
 ======================================================================
*/

function createAjaxObj(){
	var httprequest=false
	if (window.XMLHttpRequest){ // if Mozilla, Safari etc
		httprequest=new XMLHttpRequest()
		if (httprequest.overrideMimeType)
			httprequest.overrideMimeType('text/xml')
	}
	else if (window.ActiveXObject){ // if IE
		try {
			httprequest=new ActiveXObject("Msxml2.XMLHTTP");
		} 
		catch (e){
			try{
				httprequest=new ActiveXObject("Microsoft.XMLHTTP");
			}
			catch (e){}
		}
	}
	return httprequest
}

// -------------------------------------------------------------------
// Main RSS Ticker Object function
// rss_ticker(divId, cachetime, delay, optionalswitch)
// -------------------------------------------------------------------

function rss_ticker(divId, cachetime, delay, optionalswitch){
	this.cachetime=cachetime //Time to cache feed, in minutes. 0=no cache.
	this.tickerid=divId //ID of ticker div to display information
	this.delay=delay //Delay between msg change, in miliseconds.
	this.logicswitch=(typeof optionalswitch!="undefined")? optionalswitch : -1
	this.mouseoverBol=0 //Boolean to indicate whether mouse is currently over ticker (and pause it if it is)
	this.pointer=0
	this.ajaxobj=createAjaxObj()
	document.getElementById(this.tickerid).innerHTML = "Carregando ticker..."
	this.getAjaxcontent()
}

// -------------------------------------------------------------------
// getAjaxcontent()- Makes asynchronous GET request to "rssfetch.php" with the supplied parameters
// -------------------------------------------------------------------

rss_ticker.prototype.getAjaxcontent=function(){
	if (this.ajaxobj){
		var instanceOfTicker=this
		this.ajaxobj.onreadystatechange=function(){instanceOfTicker.initialize()}
		this.ajaxobj.open('GET', "http://www.emtemporeal.com.br/rss/ticker.xml", true)
		this.ajaxobj.send(null)
	}
}

// -------------------------------------------------------------------
// initialize()- Initialize ticker method.
// -Gets contents of RSS content and parse it using JavaScript DOM methods 
// -------------------------------------------------------------------

rss_ticker.prototype.initialize=function(){ 
	if (this.ajaxobj.readyState == 4){ //if request of file completed
		if (this.ajaxobj.status==200){ //if request was successful
			var xmldata=this.ajaxobj.responseXML
			if(xmldata.getElementsByTagName("item").length==0){ //if no <item> elements found in returned content
				document.getElementById(this.tickerid).innerHTML="<b>Erro</b> ao carregar o RSS feed remoto!<br />"+this.ajaxobj.responseText
				return
			}
			var instanceOfTicker=this
			this.feeditems=xmldata.getElementsByTagName("item")
		
			//Cycle through RSS XML object and store each peice of the item element as an attribute of the element
			for (var i=0; i<this.feeditems.length; i++){
				this.feeditems[i].setAttribute("ctitle", this.feeditems[i].getElementsByTagName("title")[0].firstChild.nodeValue)
				//this.feeditems[i].setAttribute("clink", this.feeditems[i].getElementsByTagName("link")[0].firstChild.nodeValue)
				this.feeditems[i].setAttribute("clink", this.feeditems[i].getElementsByTagName("link")[0].firstChild.nodeValue.replace('http://www.emtemporeal.com.br/',''))
				this.feeditems[i].setAttribute("cdescription", this.feeditems[i].getElementsByTagName("description")[0].firstChild.nodeValue)
			}
			document.getElementById(this.tickerid).onmouseover=function(){instanceOfTicker.mouseoverBol=1}
			document.getElementById(this.tickerid).onmouseout=function(){instanceOfTicker.mouseoverBol=0}
			this.rotatemsg()
		}
	}
}

// -------------------------------------------------------------------
// rotatemsg()- Rotate through RSS messages and displays them
// -------------------------------------------------------------------

rss_ticker.prototype.rotatemsg=function(){
	var instanceOfTicker=this
	if (this.mouseoverBol==1) //if mouse is currently over ticker, do nothing (pause it)
		setTimeout(function(){instanceOfTicker.rotatemsg()}, 100)
	else{
		var tickerDiv=document.getElementById(this.tickerid)
		var tickercontent='<a href="'+this.feeditems[this.pointer].getAttribute("clink")+'" rel="conteudo">'+this.feeditems[this.pointer].getAttribute("ctitle")+'</a>'
		if (this.logicswitch=="showdescription")
			tickercontent+="<br />"+this.feeditems[this.pointer].getAttribute("cdescription")
		tickerDiv.innerHTML=tickercontent
		this.pointer=(this.pointer<this.feeditems.length-1)? this.pointer+1 : 0
		setTimeout(function(){instanceOfTicker.rotatemsg()}, this.delay) //update container every second
	}
}