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

//Absolute URL syntax. Uncomment below line if you wish to use an absolute reference:
var lastrssbridgeurl = "feeds/rss.xml";

////////////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
			var feeditems;
            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				
				
				
				var is_chrome = navigator.userAgent.toLowerCase().indexOf('chrome') > -1;
				if (!is_chrome)
				{
					this.pubdate[i] = this.feeditems[i].getElementsByTagName("a10:updated")[0].firstChild.nodeValue.substring(0, 10);									
				}
				else
				{
					this.pubdate[i] = this.feeditems[i].getElementsByTagName("updated")[0].firstChild.nodeValue.substring(0, 10);									
				}
            }
    
            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]+'">'+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])
}