/*
======================================================================
Pausing RSS scroller JavaScript engine- © Dynamic Drive (http://www.dynamicdrive.com)
Docs: http://www.dynamicdrive.com/dynamicindex17/rsspausescroller/
Last modified: March 16th, 2006.
======================================================================
*/

//URL to "scrollerbridge.php" on your server:
//var bridgepath="lastrss/scrollerbridge.php"
var bridgepath="rss.asp"

//Advanced users: Edit below function to format the RSS feed output as desired
//formatrssmessage(divid, message_index_within_array, linktarget, logicswitch)

function formatrssmessage(divid, msgnumber, linktarget, logicswitch)
{
	var rsscontent=rsscontentdata[divid][msgnumber]
	var linktitle='<span class="rsstitle"><a href="'+unescape(rsscontent.link)+'" target="'+linktarget+'">'+unescape(rsscontent.title)+'</a></span>'
	var description='<div class="rssdescription">'+unescape(rsscontent.description)+'</div>'
	var feeddate='<span class="rssdate">'+unescape(rsscontent.date)+'</span>'

	if (logicswitch.indexOf("description")!=-1 && logicswitch.indexOf("date")!=-1) //Logic switch- Show description and date
		return linktitle+"<br />"+feeddate+description
	else if (logicswitch.indexOf("description")!=-1) //Logic switch- Show just description
		return linktitle+"<br />"+description
	else if (logicswitch.indexOf("date")!=-1) //Logic switch- Show just date
		return linktitle+"<br />"+feeddate
	else
		return linktitle //Default- Just return hyperlinked RSS title
}

//////NO NEED TO EDIT BEHIND HERE///////////////////////////

var rsscontentdata=new Array() //global array to hold RSS feeds contents

//rsspausescroller(RSS_id, divId, divClass, delay, linktarget, optionalswitch)

function rsspausescroller(RSS_id, divId, divClass, delay, linktarget, logicswitch)
{
	this.tickerid=divId //ID of ticker div to display information
	this.delay=delay //Delay between msg change, in miliseconds.
	this.linktarget=(typeof linktarget!="undefined")? linktarget : ""
	this.logicswitch=(typeof logicswitch!="undefined")? logicswitch : ""
	this.mouseoverBol=0 //Boolean to indicate whether mouse is currently over scroller (and pause it if it is)
	this.hiddendivpointer=1 //index of message array for hidden div
	this.js_is_loaded=0
	this.number_of_tries=0
	document.write('<div id="'+divId+'" class="'+divClass+'" style="position: relative; overflow: hidden"><div class="innerDiv" style="position: absolute; width: 100%" id="'+divId+'1"><span style="position: absolute">Initializing RSS scroller...</span></div><div class="innerDiv" style="position: absolute; width: 100%; visibility: hidden" id="'+divId+'2"></div></div>')
	if (document.getElementById){ //perform basic DOM browser support
		var parameters="id="+encodeURIComponent(RSS_id)+"&divid="+divId+"&bustcache="+new Date().getTime()
		//rsspausescroller.getRSScontentJS(bridgepath+"?"+parameters)
		rsspausescroller.getRSScontentXML(bridgepath+"?"+parameters)
		this.do_onjsload()
	}
}

// -------------------------------------------------------------------
// do_onjsload()- Checks if external JS containing RSS feed is loaded yet
// -If not, continue to check until yes, or abort after certain tries.
// -------------------------------------------------------------------

rsspausescroller.prototype.do_onjsload=function()
{
	var scrollerinstance=this
	var maxTries = 40

	if (typeof rsscontentdata[this.tickerid]=="undefined" && this.number_of_tries<maxTries){ //if JS array holding RSS content not yet loaded
		this.number_of_tries++
		setTimeout(function(){scrollerinstance.do_onjsload()}, 200) //recheck
	}
	else if (typeof rsscontentdata[this.tickerid]!="undefined"){ //if JS array has loaded
		this.tickerdiv=document.getElementById(this.tickerid)
		this.visiblediv=document.getElementById(this.tickerid+"1")
		this.hiddendiv=document.getElementById(this.tickerid+"2")
		this.visibledivtop=parseInt(rsspausescroller.getCSSpadding(this.tickerdiv))
		//set width of inner DIV to outer DIV width minus padding (padding assumed to be top padding x 2)
		this.visiblediv.style.width=this.hiddendiv.style.width=this.tickerdiv.offsetWidth-(this.visibledivtop*2)+"px"
		this.visiblediv.innerHTML=formatrssmessage(this.tickerid, 0, this.linktarget, this.logicswitch)
		if ((rsscontentdata[this.tickerid].length) > 1){this.hiddendiv.innerHTML=formatrssmessage(this.tickerid, 1, this.linktarget, this.logicswitch)}
		this.do_ondivsinitialized()
	}
	else
		document.getElementById(this.tickerid).innerHTML=rsscontentdata+"<br />I give up trying to fetch RSS feed."
	}

// -------------------------------------------------------------------
// do_ondivsinitialized()- Checks if two divs of scroller is each populated with RSS message yet
// -If not, continue to check until yes, or abort after certain tries.
// -------------------------------------------------------------------

rsspausescroller.prototype.do_ondivsinitialized=function()
{
	var scrollerinstance=this
	if (parseInt(this.visiblediv.offsetHeight)==0 || parseInt(this.hiddendiv.offsetHeight)==0)
		setTimeout(function(){scrollerinstance.doondivsinitialized()}, 100)
	else
		this.initialize()
}

// -------------------------------------------------------------------
// initialize()- Initialize scroller method.
// -Get div objects, set initial positions, start up down animation
// -------------------------------------------------------------------

rsspausescroller.prototype.initialize=function()
{
	var scrollerinstance=this
	this.getinline(this.visiblediv, this.hiddendiv)
	this.hiddendiv.style.visibility="visible"
	//set width of inner DIVs to outer DIV's width minus padding (padding assumed to be top padding x 2)
	this.visiblediv.style.width=this.hiddendiv.style.width=this.tickerdiv.offsetWidth-(this.visibledivtop*2)+"px"
	this.tickerdiv.onmouseover=function(){scrollerinstance.mouseoverBol=1}
	this.tickerdiv.onmouseout=function(){scrollerinstance.mouseoverBol=0}
	if (window.attachEvent) //Clean up loose references in IE
		window.attachEvent("onunload", function(){scrollerinstance.tickerdiv.onmouseover=scrollerinstance.tickerdiv.onmouseout=null})
	setTimeout(function(){scrollerinstance.animateup()}, this.delay)
}


// -------------------------------------------------------------------
// animateup()- Move the two inner divs of the scroller up and in sync
// -------------------------------------------------------------------


rsspausescroller.prototype.animateup=function()
{
	var scrollerinstance=this
	if (parseInt(this.hiddendiv.style.top)>(this.visibledivtop+5)){
		this.visiblediv.style.top=parseInt(this.visiblediv.style.top)-5+"px"
		this.hiddendiv.style.top=parseInt(this.hiddendiv.style.top)-5+"px"
		setTimeout(function(){scrollerinstance.animateup()}, 50)
	}else{
		this.getinline(this.hiddendiv, this.visiblediv)
		this.swapdivs()
		setTimeout(function(){scrollerinstance.rotatemessage()}, this.delay)
	}
}

// -------------------------------------------------------------------
// swapdivs()- Swap between which is the visible and which is the hidden div
// -------------------------------------------------------------------

rsspausescroller.prototype.swapdivs=function(){
var tempcontainer=this.visiblediv
this.visiblediv=this.hiddendiv
this.hiddendiv=tempcontainer
}

rsspausescroller.prototype.getinline=function(div1, div2){
div1.style.top=this.visibledivtop+"px"
div2.style.top=Math.max(div1.parentNode.offsetHeight, div1.offsetHeight)+"px"
}

// -------------------------------------------------------------------
// rotatemessage()- Populate the hidden div with the next message before it's visible
// -------------------------------------------------------------------

rsspausescroller.prototype.rotatemessage=function(){
var scrollerinstance=this
if (this.mouseoverBol==1) //if mouse is currently over scoller, do nothing (pause it)
setTimeout(function(){scrollerinstance.rotatemessage()}, 100)
else{
var i=this.hiddendivpointer
var ceiling=rsscontentdata[this.tickerid].length
this.hiddendivpointer=(i+1>ceiling-1)? 0 : i+1
this.hiddendiv.innerHTML=formatrssmessage(this.tickerid, this.hiddendivpointer, this.linktarget, this.logicswitch)
this.animateup()
}
}

// -------------------------------------------------------------------
// getRSScontentJS()- Fetch RSS feed as external JavaScript
// -------------------------------------------------------------------

rsspausescroller.getRSScontentJS=function(scripturl){
	var scriptref=document.createElement('xml')
	scriptref.setAttribute("type","text/xml")
	scriptref.setAttribute("src", scripturl)
	document.getElementsByTagName("head").item(0).appendChild(scriptref)
}

rsspausescroller.getRSScontentXML=function(scripturl){
	loadXMLDoc(scripturl)
}

rsspausescroller.getCSSpadding=function(tickerobj){ //get CSS padding value, if any
if (tickerobj.currentStyle)
return tickerobj.currentStyle["paddingTop"]
else if (window.getComputedStyle) //if DOM2
return window.getComputedStyle(tickerobj, "").getPropertyValue("padding-top")
else
return 0
}

// -------------------------------------------------------------------
// AJAX Implementation
// -------------------------------------------------------------------

function processReqChange()
{
 if (req.readyState == 4 && req.status == 200 && req.responseXML != null)
  {
	rsscontentdata['rssFeed']= new Array
	
    var items = [];
    var nl = req.responseXML.getElementsByTagName('item');
    for( var i = 0; i < nl.length; i++ )
    {
      var nli = nl.item(i);
      var title;
      var link;
      var description;
      var pubDate;

		for( var j = 0; j < nli.childNodes.length; j++ )
		{
			if (nli.childNodes.item(j).nodeName == "title"){ title = nli.childNodes.item(j).text}
			if (nli.childNodes.item(j).nodeName == "link"){ link = nli.childNodes.item(j).text}
			if (nli.childNodes.item(j).nodeName == "description"){ description = nli.childNodes.item(j).text}
			if (nli.childNodes.item(j).nodeName == "pubDate"){ pubDate = nli.childNodes.item(j).text}
		}
	
		rsscontentdata['rssFeed'][i] = new setItem(title, description, link, pubDate)

    }
    
    if (nl.length == 1){rsscontentdata['rssFeed'][1] = rsscontentdata['rssFeed'][0]}

  }
}

function loadXMLDoc(url)
{
  req = false;
  if(window.XMLHttpRequest) {
    try {
      req = new XMLHttpRequest();
        } catch(e) {
      req = false;
        }
  }
  else if(window.ActiveXObject)
  {
    try {
      req = new ActiveXObject("Msxml2.XMLHTTP");
    } catch(e) {
    try {
      req = new ActiveXObject("Microsoft.XMLHTTP");
    } catch(e) {
      req = false;
    }
  }
  }
  if(req) {
    req.onreadystatechange = processReqChange;
    req.open("GET", url, true);
    req.send("");
  }
}

//loadXMLDoc("sampleRSS.xml");

function setItem(title, description, link, date)
{
	this.title=title
	this.description=description
	this.link=link
	this.date=date
}

//rsscontentdata['rssFeed']= new Array
//rsscontentdata['rssFeed'][0] = new setItem("Item 1", "Some text", "http://www.sandshot.net/", "1/1/2006")
//rsscontentdata['rssFeed'][1] = new setItem("Item 2", "Some text", "http://www.sandshot.net/", "2/1/2006")