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

php ajax asynchronously reads rss document data, _PHP tutorial

WBOY

Release： 2016-07-12 08:55:15

Original

859 people have browsed it

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>

Copy after login

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;>

Copy after login

The above is the entire content of this article. I hope it will be helpful to everyone in learning PHP programming.

Articles you may be interested in:

Code to read RSS feed with PHP
PHP regular expression analysis RSS
PHP calls Twitter’s RSS Implementation code
Code example of how to implement asynchronous file upload through Ajax in php
Simple example code of php XMLWriter class (RSS output)
Using ThinkPHP’s built-in ThinkAjax implementation Implementation method of asynchronous transmission technology
PHP Ajax asynchronous communication to implement user name and email verification whether registered (2 methods to implement)
Ajax asynchronous transmission and PHP interaction example
PHP curl grabs AJAX asynchronous content example
php method to generate RSS subscription