AJAXRSS
AJAX RSS ??
?? AJAX ???? RSS ???? ?? ??? ?? ? ???? ???? ?? RSS ??? ?????. .
??????????????????????????????????????????????????????????????????????????????????????????????~????????????????????????????????????????????????????? ??? HTML ??? 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>
?? ? - HTML ??
????? ?? HTML ????? ???? ?? ??? ?? ??? HTML ??? ???? ????. ??? ??? ?? ?????.
1. ???? ???? ???? ??? ???? ???? ?????.
2. ????, showRSS( ) ?? ??
?? ???? "rssOutput"??? ??? <div>? ????. showRSS() ???? ??? ???? ?? ?? ???? ?????.
JavaScript
JavaScript ??? HTML ??? ??? "getrss.js"? ?????:
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;
}?? ??: stateChanged() ? GetXmlHttpObject ??? PHP ? AJAX ?? ??? ?? ?????. showRSS() ??
? ??? ???? ???? ?? ??? ??? ??? ?????.
1. ??
2. URL? ????(q)? ?????. ???? ??? ???? ???? ??? ?????.
3. ?? ??
4. GetXmlHttpObject ??? ???? XMLHTTP ??? ????, ??? ????? ??? stateChanged ??? ????? ?????.
5 ??? URL? ?? XMLHTTP? ???. ??>
6. HTTP ??? ??PHP ???
? ????. JavaScript ??? ???? ?? ???? "getrss"?? ??? PHP ?????. .php":<?php
//get the q parameter from URL
$q=$_GET["q"];
//find out which feed was selected
if($q=="Google")
{
$xml=("http://news.google.com/news?ned=us&topic=h&output=rss");
}
elseif($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>");
}
?>?? ?:JavaScript?? ??? ???? ?? ?? ??????1. PHP? RSS? ???? ?????. ??? ???????
2. RSS ??? XML DOM ??? ?????3. RSS ???? ??? ?? ?????4. RSS ??? ????
