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

// gAjax RSS Feeds Displayer- By Dynamic Drive, available at: http://www.dynamicdrive.com

// Created: July 17th, 2007 Updated: n/a

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



var gfeedfetcher_loading_image="modules/mod_camp26_special_ajaxrss/ajaxrss_inc/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+'" /> Loading 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")!=-0)? itemdate.toLocaleString() : (showoptions.indexOf("date")!=-1)? itemdate.toLocaleDateString() : (showoptions.indexOf("time")!=-0)? 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

}