// -------------------------------------------------------------------
// gAjax RSS Feeds Displayer- By Dynamic Drive, available at: http://www.dynamicdrive.com
// Created: July 17th, 2007 Updated: n/a 
// -------------------------------------------------------------------
var gfeedfetcher_loading_image="images/indicator.gif" //Full URL to "loading" image. No need to config after this line!!
google.load("feeds", "1") //Load Google Ajax Feed API (version 1)
function gfeedfetcher(divid, divClass, linktarget){
 this.linktarget=linktarget || "" //link target of RSS entries
 this.feedlabels=[] //array holding lables for each RSS feed
 this.feedurls=[]
 this.feeds=[] //array holding combined RSS feeds' entries from Feed API (result.feed.entries)
 this.feedsfetched=0 //number of feeds fetched
 this.feedlimit=5
 this.showoptions="" //Optional components of RSS entry to show (none by default) 
 this.sortstring="date" //sort by "date" by default
 document.write('<div id="'+divid+'" class="'+divClass+'"></div>') //output div to contain RSS entries 
 this.feedcontainer=document.getElementById(divid)
 this.itemcontainer="<li>" //default element wrapping around each RSS entry item
}
gfeedfetcher.prototype.addFeed=function(label, url){
 this.feedlabels[this.feedlabels.length]=label
 this.feedurls[this.feedurls.length]=url
}
gfeedfetcher.prototype.filterfeed=function(feedlimit, sortstr){
 this.feedlimit=feedlimit
 if (typeof sortstr!="undefined")
 this.sortstring=sortstr
}
gfeedfetcher.prototype.displayoptions=function(parts){
 this.showoptions=parts //set RSS entry options to show ("date, datetime, time, snippet, label, description")
}
gfeedfetcher.prototype.setentrycontainer=function(containerstr){  //set element that should wrap around each RSS entry item
this.itemcontainer="<"+containerstr.toLowerCase()+">"
}
gfeedfetcher.prototype.init=function(){
 this.feedsfetched=0 //reset number of feeds fetched to 0 (in case init() is called more than once)
 this.feeds=[] //reset feeds[] array to empty (in case init() is called more than once) 
 this.feedcontainer.innerHTML='<img src="'+gfeedfetcher_loading_image+'" /> Retrieving RSS feed(s)'
 var displayer=this
 for (var i=0; i<this.feedurls.length; i++){ //loop through the specified RSS feeds' URLs 
  var feedpointer=new google.feeds.Feed(this.feedurls[i]) //create new instance of Google Ajax Feed API
  var items_to_show=(this.feedlimit<=this.feedurls.length)? 1 : Math.floor(this.feedlimit/this.feedurls.length) //Calculate # of entries to show for each RSS feed 
  if (this.feedlimit%this.feedurls.length>0 && this.feedlimit>this.feedurls.length && i==this.feedurls.length-1) //If this is the last RSS feed, and feedlimit/feedurls.length yields a remainder
   items_to_show+=(this.feedlimit%this.feedurls.length) //Add that remainder to the number of entries to show for last RSS feed
  feedpointer.setNumEntries(items_to_show) //set number of items to display
  feedpointer.load (function(r){displayer._fetch_data_as_array(r)}) //call Feed.load() to retrieve and output RSS feed
 }
}

gfeedfetcher._formatdate=function(datestr, showoptions){
 var itemdate=new Date(datestr)
 var parseddate=(showoptions.indexOf("datetime")!=-1)? itemdate.toLocaleString() : (showoptions.indexOf("date")!=-1)? itemdate.toLocaleDateString() : (showoptions.indexOf("time")!=-1)? itemdate.toLocaleTimeString() : ""
 return "<span class='datefield'>"+parseddate+"</span><br>"
}
gfeedfetcher._sortarray=function(arr, sortstr){
 var sortstr=(sortstr=="label")? "ddlabel" : sortstr //change "label" string (if entered) to "ddlabel" instead, for internal use 
 if (sortstr=="title" || sortstr=="ddlabel"){ //sort array by "title" or "ddlabel" property of RSS feed entries[]
  arr.sort(function(a,b){
  var fielda=a[sortstr].toLowerCase() 
  var fieldb=b[sortstr].toLowerCase()
  return (fielda<fieldb)? -1 : (fielda>fieldb)? 1 : 0
  })
 }
 else{ //else, sort by "publishedDate" property (using error handling, as "publishedDate" may not be a valid date str if an error has occured while getting feed 
  try{
   arr.sort(function(a,b){return new Date(b.publishedDate)-new Date(a.publishedDate)})
  }
  catch(err){}
 }
}
gfeedfetcher.prototype._fetch_data_as_array=function(result){
 var thisfeed=(!result.error)? result.feed.entries : "" //get all feed entries as a JSON array or "" if failed
 if (thisfeed=="") //if error has occured fetching feed 
  alert("Google Feed API Error: "+result.error.message)
 for (var i=0; i<thisfeed.length; i++) //For each entry within feed
  result.feed.entries[i].ddlabel=this.feedlabels[this.feedsfetched] //extend it with a "ddlabel" property 
 this.feeds=this.feeds.concat(thisfeed) //add entry to array holding all feed entries
 this._signaldownloadcomplete() //signal the retrieval of this feed as complete (and move on to next one if defined)
}
gfeedfetcher.prototype._signaldownloadcomplete=function(){
 this.feedsfetched+=1
 if (this.feedsfetched==this.feedurls.length) //if all feeds fetched
  this._displayresult(this.feeds) //display results
} 

gfeedfetcher.prototype._displayresult=function(feeds){
 var rssoutput=(this.itemcontainer=="<li>")? "\n" : "<ul>"
 gfeedfetcher._sortarray(feeds, this.sortstring)
 for (var i=0; i<feeds.length; i++){
  var itemtitle="<a href=\"" + feeds[i].link + "\" target=\"_blank" + this.linktarget + "\" class=\"newslink\">" + feeds[i].title + "</a>" 
  //var itemtitle="<span class='RSSTitle'>" + feeds[i].title + "</span>"
 //var itemmore="<p class='moreright'><a href=\'market-news.html'" + "\" target=\"" + this.linktarget + "\" class=\"submenulink\">More&raquo;" + "</a></p>" 
  var itemlabel=/label/i.test(this.showoptions)? '<span class="labelfield">['+this.feeds[i].ddlabel+']</span>' : " "
  var itemdate=gfeedfetcher._formatdate(feeds[i].publishedDate, this.showoptions)
  var itemdescription=/description/i.test(this.showoptions)? +feeds[i].content : /snippet/i.test(this.showoptions)? "<br />"+feeds[i].contentSnippet  : "" 

  rssoutput+=this.itemcontainer + itemtitle +  itemdescription + this.itemcontainer.replace("<", "</") + "\n" 
 }
 rssoutput+=(this.itemcontainer=="</li>")? "" : "</ul>"
 this.feedcontainer.innerHTML=rssoutput
}