// -------------------------------------------------------------------

// Advanced RSS Ticker (Ajax invocation) core file

// Author: Dynamic Drive (http://www.dynamicdrive.com)

// -------------------------------------------------------------------



//Relative URL syntax:

var lastrssbridgeurl="lastrss/bridge.php"



//Absolute URL syntax. Uncomment below line if you wish to use an absolute reference:

//var lastrssbridgeurl="http://"+window.location.hostname+"/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=[] //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>Error</b> fetching remote RSS feed!<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

}

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

// -------------------------------------------------------------------



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)

var linktitle='<div class="rsstitle"><a href="'+this.link[this.pointer]+'" target="_blank">'+this.title[this.pointer]+'</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 //STRING FOR FEED CONTENTS 

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])

}