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php ajax异步读取rss文档数据_PHP

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May 28, 2016 am 11:47 AM

ajaxphp

RSS(Really Simple Syndication)是一种描述和同步网站内容的格式，是使用最广泛的XML应用。RSS搭建了信息迅速传播的一个技术平台，使得每个人都成为潜在的信息提供者。

本文实例为大家分享了php ajax异步读取rss文档数据的相关代码，供大家参考，具体内容如下

代码如下：

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>

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;>

以上就是本文的全部内容，希望对大家学习php程序设计有所帮助。

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