PHP和AJAX的RSS阅读器
PHP和AJAX的RSS阅读器,RSS阅读器是用来读取RSS信息,允许快速的RSS浏览新闻和更新.
AJAX的RSS阅读器:在AJAX以下例子,我们将展示一个RSS阅读器的内容从RSS是载入网页无需刷新.
在HTML表单:这是HTML网页,它包含一个简单的HTML表格,并链接到一个JavaScript:
<html> <head> <script type="text/javascript" src="getrss.js"></script> </head> <body><form> Select an RSS-Feed: <select onchange="showRSS(this.value)"> <option value="Google">Google News</option> <option value="MSNBC">MSNBC News</option> </select> </form><p><div id="rssOutput"> <b>RSS Feed will be listed here.</b></div></p> </body> </html>
例如解释-的H TML表单正如你可以看到,HTML网页上面载有一个简单的HTML表单的下拉框,作品的形式像这样,事件触发时,用户选择一个选项在下拉框中当事件触发的功能要求showRSS ()被处决,下面的形式是一个
var xmlHttp
function showRSS(str) {
xmlHttp = GetXmlHttpObject()
if (xmlHttp == null) {
alert("Browser does not support HTTP Request")
return
}
var url = "getrss.php"
url = url + "?q=" + str
url = url + "&sid=" + Math.random()
xmlHttp.onreadystatechange = stateChanged
xmlHttp.open("GET", url, true)
xmlHttp.send(null)
}
function stateChanged() {
if (xmlHttp.readyState == 4 || xmlHttp.readyState == "complete") {
document.getElementById("rssOutput")
.innerHTML = xmlHttp.responseText
}
}
function GetXmlHttpObject() {
var xmlHttp = null;
try {
// Firefox, Opera 8.0+, Safari
xmlHttp = new XMLHttpRequest();
} catch (e) {
// Internet Explorer
try {
xmlHttp = new ActiveXObject("Msxml2.XMLHTTP");
} catch (e) {
xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
}
}
return xmlHttp;
}例如解释 该stateChanged ()和GetXmlHttpObject职能是一样的PHP的AJAX推荐的篇章,该showRSS ()函数每一次的选择是选择在输入外地执行这一职能如下:界定了网址（档）传送给服务器 添加一个参数（ Q ）的网址与选定的选项从下拉框中 添加一个随机数字,以防止服务器使用快取档案,吁请GetXmlHttpObject函数创建一个XMLHTTP物件,并讲述了对象执行的功能要求时stateChanged变化是触发 开幕XMLHTTP物件与特定网址,发送一个HTTP请求到服务器,PHP页面网页服务器要求的JavaScript代码是一个PHP文件名为"getrss.php" :
<?php
//get the q parameter from URL
$q = $_GET["q"];
//find out which feed was selected
if ($q == "Google") {
$xml = ("http://news.phprm.com/news?ned=us&topic=h&output=rss");
} elseif ($q == "MSNBC") {
$xml = ("http://rss.msnbc.msn.com/id/3032091/device/rss/rss.xml");
}
$xmlDoc = new DOMDocument();
$xmlDoc->load($xml);
//get elements from "<channel>"
$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;
//output elements from "<channel>"
echo ("<p><a href='" . $channel_link . "'>" . $channel_title . "</a>");
echo ("<br />");
echo ($channel_desc . "</p>");
//get and output "<item>" elements
$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>");
}
?>本文地址：
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