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PHP - Ajax RSS Feed Example

Unknown 03:06 No comments

PHP - Ajax RSS Feed Example


RSS

Really Simple Syndication is used to publish often updated information from website like audio, video, images, etc. We can integrate RSS feeds to a website by using Ajax and php. This code demonstrates how to show RSS feeds in our site.

Index.html

Index page should be as follows −
<html>
   <head>
      
      <script>
         function showRSS(str) {
            if (str.length==0) { 
               document.getElementById("output").innerHTML="";
               return;
            }
         
            if (window.XMLHttpRequest) {
               xmlhttp=new XMLHttpRequest();
            }
            else 
            {
               xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
            }
            xmlhttp.onreadystatechange=function() {
               if (xmlhttp.readyState==4 && xmlhttp.status==200) {
                  document.getElementById("output").innerHTML=xmlhttp.responseText;
               }
            }
            
            xmlhttp.open("GET","rss.php?q="+str,true);
            xmlhttp.send();
         }
      </script>
      
   </head>
   <body>
      <p>Please Select an option to get RSS:</p>
      
      <form>
         <select onchange="showRSS(this.value)">
            <option value="">Select an RSS-feed:</option>
            <option value="cnn">CNN</option>
            <option value="bbc">BBC News</option>
            <option value="pc">PC World</option>
         </select>
      </form>
      <br>
      
      <div id="output">RSS-feeds</div>
      
   </body>
</html>

rss.php

rss.php has contained syntax about how to get access to rss feeds and return rss feeds to web pages.
<?php
   $q=$_GET["q"];
   
   if($q=="cnn") {
      $xml=("http://rss.cnn.com/rss/cnn_topstories.rss");
   }
   
   elseif($q=="bbc") {
      $xml=("http://newsrss.bbc.co.uk/rss/newsonline_world_edition/americas/rss.xml");
   }
   
   elseif($q="pcw"){
      $xml=("http://www.pcworld.com/index.rss");
   }
   $xmlDoc = new DOMDocument();
   $xmlDoc->load($xml);
   
   $channel=$xmlDoc->getElementsByTagName('channel')->item(0);
   
   $channel_title = $channel->getElementsByTagName('title')
   ->item(0)->childNodes->item(0)->nodeValue;
   
   $channel_link = $channel->getElementsByTagName('link')
   ->item(0)->childNodes->item(0)->nodeValue;
   
   $channel_desc = $channel->getElementsByTagName('description')
   ->item(0)->childNodes->item(0)->nodeValue;
   
   echo("<p><a href='" . $channel_link . "'>" . $channel_title . "</a>");
   echo("<br>");
   echo($channel_desc . "</p>");
   
   $x=$xmlDoc->getElementsByTagName('item');
   
   for ($i=0; $i<=2; $i++) {
      $item_title=$x->item($i)->getElementsByTagName('title')
      ->item(0)->childNodes->item(0)->nodeValue;
      
      $item_link=$x->item($i)->getElementsByTagName('link')
      ->item(0)->childNodes->item(0)->nodeValue;
      
      $item_desc=$x->item($i)->getElementsByTagName('description')
      ->item(0)->childNodes->item(0)->nodeValue;
      
      echo ("<p><a href='" . $item_link . "'>" . $item_title . "</a>");
      echo ("<br>");
      echo ($item_desc . "</p>");
   }
?>

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