php ajax asynchronously reads rss document data, _PHP tutorial-PHP Tutorial-php.cn

php ajax asynchronously reads rss document data, _PHP tutorial

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Release： 2016-07-12 08:55:15

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php ajax reads RSS document data asynchronously,

RSS (Really Simple Syndication) is a format for describing and synchronizing website content, and is the most widely used XML application. RSS has built a technical platform for rapid information dissemination, making everyone a potential information provider.

The example in this article shares with you the relevant code for php ajax to read RSS document data asynchronously for your reference. The specific content is as follows

The code is as follows:

index.html

<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&#63;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>

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rss.php

<&#63;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>");
 }
&#63;>

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