jquery.ghostrelated.min.js

(function($){defaults={feed:"/rss",titleClass:".post-title",tagsClass:".post-meta",limit:5,debug:false,template:'<li><a href="{url}">{title}</a></li>',messages:{noRelated:"No related posts were found."}};function RelatedPosts(element,options){this.element=element;this.options=$.extend({},defaults,options);this.parseRss()}RelatedPosts.prototype.displayRelated=function(posts){var self=this,count=0;this._currentPostTags=this.getCurrentPostTags(this.options.tagsClass);var related=this.matchByTag(this._currentPostTags,posts);var options=this.options;related.forEach(function(post){var template=options.template.replace(/{[^{}]+}/g,function(key){return post[key.replace(/[{}]+/g,"")]||""});if(count<self.options.limit){$(self.element).append($(template))}count++});if(count==0){$(this.element).append($("<li>"+this.messages.noRelated+"</li>"))}};RelatedPosts.prototype.parseRss=function(pageNum,prevId,feeds){var page=pageNum||1,prevId=prevId||"",feeds=feeds||[],self=this;$.ajax({url:this.options.feed+"/"+page,type:"GET"}).done(function(data,textStatus,xhr){var curId=$(data).find("item > guid").text();if(curId!=prevId){feeds.push(data);self.parseRss(page+1,curId,feeds)}else{var posts=self.getPosts(feeds);self.displayRelated(posts)}}).fail(function(e){self.reportError(e)})};RelatedPosts.prototype.getCurrentPostTitle=function(titleClass){if(titleClass[0]!="."){titleClass="."+titleClass}var postTitle=$(titleClass).text();if(postTitle.length<1){this.reportError("Couldn't find the post title with class: "+titleClass)}return postTitle};RelatedPosts.prototype.getCurrentPostTags=function(tagsClass){if(tagsClass[0]!="."){tagsClass="."+tagsClass}var tags=[];$(tagsClass+" a").each(function(){tags.push($(this).text())});if(tags.length<1){this.reportError("Couldn't find any tags in this post")}return tags};RelatedPosts.prototype.getPosts=function(feeds){var posts=[],items=[];feeds.forEach(function(feed){items=$.merge(items,$(feed).find("item"))});for(var i=0;i<items.length;i++){var item=$(items[i]);if(item.find("title").text()!==this.getCurrentPostTitle(this.options.titleClass)){posts.push({title:item.find("title").text(),url:item.find("link").text(),content:item.find("description").text(),tags:$.map(item.find("category"),function(elem){return $(elem).text()})})}}if(posts.length<1){this.reportError("Couldn't find any posts in feed: "+feed)}return posts};RelatedPosts.prototype.matchByTag=function(postTags,posts){var matches=[];posts.forEach(function(post){var beenAdded=false;post.tags.forEach(function(tag){postTags.forEach(function(postTag){if(postTag.toLowerCase()===tag.toLowerCase()&&!beenAdded){matches.push(post);beenAdded=true}})})});if(matches.length<1){this.reportError("There are no closely related posts")}return matches};RelatedPosts.prototype.reportError=function(error){if(this.options.debug){$(this.element).append($("<li>"+error+"</li>"))}};$.fn.ghostRelated=function(options){return this.each(function(){new RelatedPosts(this,options)})}})(jQuery);