120 lines
6.2 KiB
JavaScript
120 lines
6.2 KiB
JavaScript
// -------------------------------------------------------------------
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// gAjax RSS Feeds Displayer- By Dynamic Drive, available at: http://www.dynamicdrive.com
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// Created: July 17th, 2007
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// Updated June 14th, 10': Fixed issue in IE where labels would sometimes be associated with the incorrect feed items
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// -------------------------------------------------------------------
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var gfeedfetcher_loading_image="resources/indicator.gif" //Full URL to "loading" image. No need to config after this line!!
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google.load("feeds", "1") //Load Google Ajax Feed API (version 1)
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function gfeedfetcher(divid, divClass, linktarget){
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this.linktarget=linktarget || "" //link target of RSS entries
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this.feedlabels=[] //array holding lables for each RSS feed
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this.feedurls=[]
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this.feeds=[] //array holding combined RSS feeds' entries from Feed API (result.feed.entries)
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this.feedsfetched=0 //number of feeds fetched
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this.feedlimit=5
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this.showoptions="" //Optional components of RSS entry to show (none by default)
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this.sortstring="date" //sort by "date" by default
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document.write('<div id="'+divid+'" class="'+divClass+'"></div>') //output div to contain RSS entries
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this.feedcontainer=document.getElementById(divid)
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this.itemcontainer="<li>" //default element wrapping around each RSS entry item
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}
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gfeedfetcher.prototype.addFeed=function(label, url){
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this.feedlabels[this.feedlabels.length]=label
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this.feedurls[this.feedurls.length]=url
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}
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gfeedfetcher.prototype.filterfeed=function(feedlimit, sortstr){
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this.feedlimit=feedlimit
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if (typeof sortstr!="undefined")
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this.sortstring=sortstr
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}
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gfeedfetcher.prototype.displayoptions=function(parts){
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this.showoptions=parts //set RSS entry options to show ("date, datetime, time, snippet, label, description")
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}
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gfeedfetcher.prototype.setentrycontainer=function(containerstr){ //set element that should wrap around each RSS entry item
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this.itemcontainer="<"+containerstr.toLowerCase()+">"
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}
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gfeedfetcher.prototype.init=function(){
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this.feedsfetched=0 //reset number of feeds fetched to 0 (in case init() is called more than once)
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this.feeds=[] //reset feeds[] array to empty (in case init() is called more than once)
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this.feedcontainer.innerHTML='<p><img src="'+gfeedfetcher_loading_image+'" /> Retrieving RSS feed(s)</p>'
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var displayer=this
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for (var i=0; i<this.feedurls.length; i++){ //loop through the specified RSS feeds' URLs
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var feedpointer=new google.feeds.Feed(this.feedurls[i]) //create new instance of Google Ajax Feed API
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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
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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
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items_to_show+=(this.feedlimit%this.feedurls.length) //Add that remainder to the number of entries to show for last RSS feed
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feedpointer.setNumEntries(items_to_show) //set number of items to display
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feedpointer.load(function(label){
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return function(r){
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displayer._fetch_data_as_array(r, label)
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}
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}(this.feedlabels[i])) //call Feed.load() to retrieve and output RSS feed.
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}
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}
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gfeedfetcher._formatdate=function(datestr, showoptions){
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var itemdate=new Date(datestr)
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var parseddate=(showoptions.indexOf("datetime")!=-1)? itemdate.toLocaleString() : (showoptions.indexOf("date")!=-1)? itemdate.toLocaleDateString() : (showoptions.indexOf("time")!=-1)? itemdate.toLocaleTimeString() : ""
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return "<span class='datefield'>"+parseddate+"</span>"
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}
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gfeedfetcher._sortarray=function(arr, sortstr){
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var sortstr=(sortstr=="label")? "ddlabel" : sortstr //change "label" string (if entered) to "ddlabel" instead, for internal use
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if (sortstr=="title" || sortstr=="ddlabel"){ //sort array by "title" or "ddlabel" property of RSS feed entries[]
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arr.sort(function(a,b){
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var fielda=a[sortstr].toLowerCase()
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var fieldb=b[sortstr].toLowerCase()
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return (fielda<fieldb)? -1 : (fielda>fieldb)? 1 : 0
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})
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}
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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
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try{
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arr.sort(function(a,b){return new Date(b.publishedDate)-new Date(a.publishedDate)})
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}
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catch(err){}
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}
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}
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gfeedfetcher.prototype._fetch_data_as_array=function(result, ddlabel){
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var thisfeed=(!result.error)? result.feed.entries : "" //get all feed entries as a JSON array or "" if failed
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if (thisfeed==""){ //if error has occured fetching feed
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alert("Some blog posts could not be loaded: "+result.error.message)
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}
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for (var i=0; i<thisfeed.length; i++){ //For each entry within feed
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result.feed.entries[i].ddlabel=ddlabel //extend it with a "ddlabel" property
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}
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this.feeds=this.feeds.concat(thisfeed) //add entry to array holding all feed entries
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this._signaldownloadcomplete() //signal the retrieval of this feed as complete (and move on to next one if defined)
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}
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gfeedfetcher.prototype._signaldownloadcomplete=function(){
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this.feedsfetched+=1
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if (this.feedsfetched==this.feedurls.length) //if all feeds fetched
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this._displayresult(this.feeds) //display results
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}
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gfeedfetcher.prototype._displayresult=function(feeds){
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var rssoutput=(this.itemcontainer=="<li>")? "<ul>\n" : ""
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gfeedfetcher._sortarray(feeds, this.sortstring)
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for (var i=0; i<feeds.length; i++){
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var itemtitle="<a rel=\"nofollow\" href=\"" + feeds[i].link + "\" target=\"" + this.linktarget + "\" class=\"titlefield\">" + feeds[i].title + "</a>"
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var itemlabel=/label/i.test(this.showoptions)? '<span class="labelfield">['+this.feeds[i].ddlabel+']</span>' : " "
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var itemdate=gfeedfetcher._formatdate(feeds[i].publishedDate, this.showoptions)
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var itemdescription=/description/i.test(this.showoptions)? "<br />"+feeds[i].content : /snippet/i.test(this.showoptions)? "<br />"+feeds[i].contentSnippet : ""
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rssoutput+=this.itemcontainer + itemtitle + " " + itemlabel + " " + itemdate + "\n" + itemdescription + this.itemcontainer.replace("<", "</") + "\n\n"
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}
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rssoutput+=(this.itemcontainer=="<li>")? "</ul>" : ""
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this.feedcontainer.innerHTML=rssoutput
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}
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