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

//Relative URL syntax:
var lastrssbridgeurl = '';

if( location.host == 'www.weser-kurier.de' )
      lastrssbridgeurl = "/bremen4u/citytalk/teaser/lastrss/bridge.php";
else
      lastrssbridgeurl = "/citytalk/teaser/lastrss/bridge.php";

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

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
// 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 key indicating which RSS feed to display
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 logicswitch!="undefined")? logicswitch : ""
this.mouseoverBol=0 //Boolean to indicate whether mouse is currently over ticker (and pause it if it is)
this.pointer=0
this.opacitysetting=0.2 //Opacity value when reset. Internal use.
this.title=[], this.link=[], this.description=[], this.pubdate=[], this.category=[] //Arrays to hold each component of an RSS item
this.ajaxobj=createAjaxObj()
//document.write('<div id="'+divId+'" class="'+divClass+'" >Initializing ticker...</div>')
if (window.getComputedStyle) //detect if moz-opacity is defined in external CSS for specified class
this.mozopacityisdefined=(window.getComputedStyle(document.getElementById(this.tickerid), "").getPropertyValue("-moz-opacity")==1)? 0 : 1
this.getAjaxcontent()
}

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

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

rssticker_ajax.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>Problem</b> beim Holen des RSS-Feeds!<br />"+this.ajaxobj.responseText
return
}
var instanceOfTicker=this
this.feeditems=xmldata.getElementsByTagName("item")
//Cycle through RSS XML object and store each peice of an item inside a corresponding 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
	this.category[i]=this.feeditems[i].getElementsByTagName("category")[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
// -------------------------------------------------------------------

function doStrong ( temp ) {
	temp = temp.split( '#' );
	return '<strong>'+temp[0]+'</strong><br />'+temp[1];
}

rssticker_ajax.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 { //else, construct item, show and rotate it!

		var tickerDiv=document.getElementById(this.tickerid)
		if(this.pointer % 2 == 1) {
			class1='ungrade';
			class2='grade';
			class3='ungrade';
			class4='grade';									
		} else {
			class1='grade';
			class2='ungrade';
			class3='grade';
			class4='ungrade';									
		}
		
		if(this.title[this.pointer].length > 25)
			var title = this.title[this.pointer].substr(0, 25) + ' ...'
		else
			var title = this.title[this.pointer];
		
	
		var linktitle='<br /><a href="'+this.link[this.pointer]+'" onclick="void(link(\''+this.link[this.pointer]+'\')); return false;">'+title+'</a></div>';
		var description='<div class="rssdescription">'+this.description[this.pointer]+'</div>';
		temp = doStrong( this.pubdate[this.pointer] );
		var feeddate='<div class="rssdate">'+temp+'</div>';
		var cat='<div class="rsscat">'+this.category[this.pointer];
		var tickercontent1='<div class="'+class1+'">'+feeddate+cat+linktitle+'</div>';

		var p2=(this.pointer<this.feeditems.length-1)? this.pointer+1 : 0;

		if(this.title[p2].length > 27)
			var title = this.title[p2].substr(0, 27) + ' ...'
		else
			var title = this.title[p2];		
			
		var linktitle='<br /><a href="'+this.link[p2]+'" onclick="void(link(\''+this.link[p2]+'\')); return false;">'+title+'</a></div>';
		var description='<div class="rssdescription">'+this.description[p2]+'</div>';
		temp = doStrong( this.pubdate[p2] );
		var feeddate='<div class="rssdate">'+temp+'</div>';
		var cat='<div class="rsscat">'+this.category[p2];
		var tickercontent2='<div class="'+class2+'">'+feeddate+cat+linktitle+'</div>'		
				
		var p3=(p2<this.feeditems.length-1)? p2+1 : 0;

		if(this.title[p3].length > 27)
			var title = this.title[p3].substr(0, 27) + ' ...';
		else
			var title = this.title[p3];			
					
		var linktitle='<br /><a href="'+this.link[p3]+'" onclick="void(link(\''+this.link[p3]+'\')); return false;">'+title+'</a></div>';
		var description='<div class="rssdescription">'+this.description[p3]+'</div>';
		temp = doStrong( this.pubdate[p3] );
		var feeddate='<div class="rssdate">'+temp+'</div>';
		var cat='<div class="rsscat">'+this.category[p3];
		var tickercontent3='<div class="'+class3+'">'+feeddate+cat+linktitle+'</div>';

		var p4=(p3<this.feeditems.length-1)? p3+1 : 0;

		if(this.title[p4].length > 27)
			var title = this.title[p4].substr(0, 27) + ' ...';
		else
			var title = this.title[p4];			
					
		var linktitle='<br /><a href="'+this.link[p4]+'" onclick="void(link(\''+this.link[p4]+'\')); return false;">'+title+'</a></div>';
		var description='<div class="rssdescription">'+this.description[p4]+'</div>';
		temp = doStrong( this.pubdate[p4] );
		var feeddate='<div class="rssdate">'+temp+'</div>';
		var cat='<div class="rsscat">'+this.category[p4];
		var tickercontent4='<div class="'+class4+'">'+feeddate+cat+linktitle+'</div>';

		if (this.logicswitch.indexOf("description")==-1) 
			description="";
		if (this.logicswitch.indexOf("date")==-1) 
			feeddate="";
								
		var tickercontent=tickercontent1+tickercontent2+tickercontent3+tickercontent4;
		this.fadetransition("reset"); //FADE EFFECT- RESET OPACITY
		tickerDiv.innerHTML=tickercontent;

		this.fadetimer1=setInterval(function(){instanceOfTicker.fadetransition('up', 'fadetimer1')}, 100) //FADE EFFECT- PLAY IT
		this.pointer=(this.pointer<this.feeditems.length-1)? this.pointer+1 : 0
		setTimeout(function(){instanceOfTicker.rotatemsg()}, this.delay) //update container every second
	}
}

// -------------------------------------------------------------------
// fadetransition()- cross browser fade method for IE5.5+ and Mozilla/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])
}