// -------------------------------------------------------------------
// gAjax RSS Feeds Displayer- By Dynamic Drive, available at: http://www.dynamicdrive.com
// Created: July 17th, 2007 Updated: n/a
// -------------------------------------------------------------------
var gfeedfetcher_loading_image="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>"
}
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>")? "<ul>\n" : ""	
gfeedfetcher._sortarray(feeds, this.sortstring)	
for (var i=0; i<feeds.length; i++){		
var itemtitle="<a href=\"" + feeds[i].link + "\" target=\"" + this.linktarget + "\" class=\"titlefield\">" + feeds[i].title + "</a>"		
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)? "<br />"+feeds[i].content : /snippet/i.test(this.showoptions)? "<br />"+feeds[i].contentSnippet  : ""		
rssoutput+=this.itemcontainer + itemtitle + " " + itemlabel + " " + itemdate + "\n" + itemdescription + this.itemcontainer.replace("<", "</") + "\n\n"	
}	
rssoutput+=(this.itemcontainer=="<li>")? "</ul>" : ""	
this.feedcontainer.innerHTML=rssoutput
}