// -------------------------------------------------------------------
// Advanced RSS Ticker (Ajax invocation) core file
// Author: Dynamic Drive (http://www.dynamicdrive.com)
// -------------------------------------------------------------------

//Sintassi URL Relativo:

//Sintassi URL Assoluto. de-commentare la linea sotto nel caso si decida di usare un URL assoluto
//var lastrssbridgeurl="http://"+window.location.hostname+"/lastrss/bridge.php"

////////////nessuna modifica qui//////////////

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

// -------------------------------------------------------------------
// Lettura feed RSS
// rssticker_ajax(RSS_id, cachetime, divId, divClass, delay, optionallogicswitch)
// -------------------------------------------------------------------

function rssticker_ajax(RSS_id, cachetime, divId, divClass, delay, logicswitch){
this.RSS_id=RSS_id //Array relativo al feed da leggere
this.cachetime=cachetime //tempo x il salvataggio feed, in minuti. 0=nessun salvataggio.
this.tickerid=divId //ID del lettore RSS
this.delay=delay //Pausa tra una lettura ed un' altra.
this.logicswitch=(typeof logicswitch!="undefined")? logicswitch : ""
this.mouseoverBol=0 //Valore boolean x indicare se il mouse è sul lettore o no
this.pointer=0
this.opacitysetting=0.2 //Valore Opacity
this.title=[], this.link=[], this.description=[], this.pubdate=[] //Crea arrays ove memorizzare ciascun componente dell' RSS
this.ajaxobj=createAjaxObj()
document.write('<div id="'+divId+'" class="'+divClass+'" >Initializing ticker...</div>')
if (window.getComputedStyle)
this.mozopacityisdefined=(window.getComputedStyle(document.getElementById(this.tickerid), "").getPropertyValue("-moz-opacity")==1)? 0 : 1
this.getAjaxcontent()
}

// -------------------------------------------------------------------
// getAjaxcontent()- Effettua una richiesta GET a "bridge.php" x parametri in più
// -------------------------------------------------------------------

rssticker_ajax.prototype.getAjaxcontent=function(){
if (this.ajaxobj){
var instanceOfTicker=this
var parameters="id="+encodeURIComponent(this.RSS_id)+"&cachetime="+this.cachetime+"&bustcache="+new Date().getTime()
this.ajaxobj.onreadystatechange=function(){instanceOfTicker.initialize()}
this.ajaxobj.open('GET', lastrssbridgeurl+"?"+parameters, true)
this.ajaxobj.send(null)
}
}

// -------------------------------------------------------------------
// initialize()- Inizializza il metodo di lettura
// -------------------------------------------------------------------

rssticker_ajax.prototype.initialize=function(){ 
if (this.ajaxobj.readyState == 4){ //se la richiesta è completa
if (this.ajaxobj.status==200){ //se la richiesta è andata a buon fine
var xmldata=this.ajaxobj.responseXML
if(xmldata.getElementsByTagName("item").length==0){ //se nessun elemento <item> è stato trovato, ritorna il contenuto
document.getElementById(this.tickerid).innerHTML="<b>Error</b> fetching remote RSS feed!<br />"+this.ajaxobj.responseText
return
}
var instanceOfTicker=this
this.feeditems=xmldata.getElementsByTagName("item")
//memorizza ogni RSS in un array
for (var i=0; i<this.feeditems.length; i++){
this.title[i]=this.feeditems[i].getElementsByTagName("title")[0].firstChild.nodeValue
this.link[i]=this.feeditems[i].getElementsByTagName("link")[0].firstChild.nodeValue
this.description[i]=this.feeditems[i].getElementsByTagName("description")[0].firstChild.nodeValue
this.pubdate[i]=this.feeditems[i].getElementsByTagName("pubDate")[0].firstChild.nodeValue
}
document.getElementById(this.tickerid).onmouseover=function(){instanceOfTicker.mouseoverBol=1}
document.getElementById(this.tickerid).onmouseout=function(){instanceOfTicker.mouseoverBol=0}
this.rotatemsg()
}
}
}

// -------------------------------------------------------------------
// rotatemsg()- Rotazione ciclica degli RSS
// -------------------------------------------------------------------

rssticker_ajax.prototype.rotatemsg=function(){
var instanceOfTicker=this
if (this.mouseoverBol==1) //se il mouse è sul lettore, metto in pausa il movimento
setTimeout(function(){instanceOfTicker.rotatemsg()}, 100)
else{ //altrimenti, ruota!
var tickerDiv=document.getElementById(this.tickerid)
var linktitle='<div class="rsstitle"><a target="_blank" class="link_menu" href="'+this.link[this.pointer]+'"><b>'+this.title[this.pointer]+'</b></a></div>'
var description='<div class="rssdescription">'+this.description[this.pointer]+'</div>'
var feeddate='<div class="rssdate">'+this.pubdate[this.pointer]+'</div>'
if (this.logicswitch.indexOf("description")==-1) description=""
if (this.logicswitch.indexOf("date")==-1) feeddate=""
var tickercontent=linktitle+feeddate+description 
this.fadetransition("reset") //EFFETTO DISSOLVENZA
tickerDiv.innerHTML=tickercontent
this.fadetimer1=setInterval(function(){instanceOfTicker.fadetransition('up', 'fadetimer1')}, 100) //Avvia l' effetto dissolvenza
this.pointer=(this.pointer<this.feeditems.length-1)? this.pointer+1 : 0
setTimeout(function(){instanceOfTicker.rotatemsg()}, this.delay) //aggiorna ogni secondo
}
}

// -------------------------------------------------------------------
// fadetransition()- effetto dissolvenza in IE e Firefox
// -------------------------------------------------------------------

rssticker_ajax.prototype.fadetransition=function(fadetype, timerid){
var tickerDiv=document.getElementById(this.tickerid)
if (fadetype=="reset")
this.opacitysetting=0.2
if (tickerDiv.filters && tickerDiv.filters[0]){
if (typeof tickerDiv.filters[0].opacity=="number") //IE6+
tickerDiv.filters[0].opacity=this.opacitysetting*100
else //IE 5.5
tickerDiv.style.filter="alpha(opacity="+this.opacitysetting*100+")"
}
else if (typeof tickerDiv.style.MozOpacity!="undefined" && this.mozopacityisdefined){
tickerDiv.style.MozOpacity=this.opacitysetting
}
if (fadetype=="up")
this.opacitysetting+=0.2
if (fadetype=="up" && this.opacitysetting>=1)
clearInterval(this[timerid])
}