jQuery获取RSS提要实时阅读器

Posted 2021-02-25

Use jQuery get rss (with javascript) to get a blogs (or websites) display rss feed on your web page.

var gfeedfetcher_loading_image="/images/page-images/loader.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='<p><img class="textmiddle" src="'+gfeedfetcher_loading_image+'" /> Loading <a href="http://blogoola.com" title="Submit your blog">blog</a> feeds...</p>'
    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(label){
            return function(r){
                displayer._fetch_data_as_array(r, label)
            }
        }(this.feedlabels[i])) //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, ddlabel){
    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("Some blog posts could not be loaded: "+result.error.message)
    }
    for (var i=0; i<thisfeed.length; i++){ //For each entry within feed
        result.feed.entries[i].ddlabel=ddlabel //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>
" : ""
    gfeedfetcher._sortarray(feeds, this.sortstring)
    for (var i=0; i<feeds.length; i++){
        var itemtitle="<a rel="nofollow" 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 + "
" + itemdescription + this.itemcontainer.replace("<", "</") + "

"
    }
    rssoutput+=(this.itemcontainer=="<li>")? "</ul>" : ""
    this.feedcontainer.innerHTML=rssoutput
}