PHP Beginner's AJAX Reader

First we create two php files

head.php code is as follows:

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>php中文网(php.cn)</title>
<script>
	function showRSS(str){
		if (str.length==0){ 
			document.getElementById("rssOutput").innerHTML="";
			return;
			}
		if (window.XMLHttpRequest){
			// IE7+, Firefox, Chrome, Opera, Safari 浏览器执行代码
			xmlhttp=new XMLHttpRequest();
		}else{
			// IE6, IE5 浏览器执行代码
			xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
		}

		xmlhttp.onreadystatechange=function(){
			if (xmlhttp.readyState==4 && xmlhttp.status==200){
				document.getElementById("rssOutput").innerHTML=xmlhttp.responseText;
			}
		}
		xmlhttp.open("GET","demo.php?q="+str,true);
		xmlhttp.send();
	}
</script>
</head>
<body>

<form>
<select onchange="showRSS(this.value)">
<option value="">选择一个 RSS-feed:</option>
<option value="rss">读取 RSS 数据</option>
</select>
</form>
<br>
<div id="rssOutput">RSS-feed 数据列表...</div>
</body>
</html>

Next we create another php file, the code is as follows:

<?php
// rss 文件
$xml="demo.xml";

$xmlDoc = new DOMDocument();
$xmlDoc->load($xml);

// 从 "<channel>" 中读取元素
$channel=$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;

// 输出 "<channel>" 中的元素
echo("<p><a href='" . $channel_link
  . "'>" . $channel_title . "</a>");
echo("<br>");
echo($channel_desc . "</p>");

// 输出 "<item>" 中的元素
$x=$xmlDoc->getElementsByTagName('item');
for ($i=0; $i<=1; $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>");
}
?>

Continue Next we are going to create a demo.xml file, the code is as follows:

<?xml version="1.0" encoding="UTF-8" ?>
<rss version="2.0">
<channel>
  <title>php教程</title>
  <link>http://www.php.cn</link>
  <description>学的不仅技术，更新梦想！！</description>
  <item>
    <title>RSS 教程</title>
    <link>http://www.php.cn/rss/rss-tutorial.html</link>
    <description>通过使用 RSS，您可以有选择地浏览您感兴趣的以及与您的工作相关的新闻�?/description>
  </item>
  <item>
    <title>XML 教程</title>
    <link>http://www.php.cn/xml/xml-tutorial.html</link>
    <description>XML 指可扩展标记语言（eXtensible Markup Language）</description>
  </item>
</channel>

</rss>

Continuing Learning

new file

<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>php中文网(php.cn)</title> <script> function showRSS(str){ if (str.length==0){ document.getElementById("rssOutput").innerHTML=""; return; } if (window.XMLHttpRequest){ // IE7+, Firefox, Chrome, Opera, Safari 浏览器执行代码 xmlhttp=new XMLHttpRequest(); }else{ // IE6, IE5 浏览器执行代码 xmlhttp=new ActiveXObject("Microsoft.XMLHTTP"); } xmlhttp.onreadystatechange=function(){ if (xmlhttp.readyState==4 && xmlhttp.status==200){ document.getElementById("rssOutput").innerHTML=xmlhttp.responseText; } } xmlhttp.open("GET","6_2.php?q="+str,true); xmlhttp.send(); } </script> </head> <body> <form> <select onchange="showRSS(this.value)"> <option value="">选择一个 RSS-feed:</option> <option value="rss">读取 RSS 数据</option> </select> </form> <br> <div id="rssOutput">RSS-feed 数据列表...</div> </body> </html>

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