ajax加载xml案例

下面的例子将演示网页如何使用 AJAX 来读取来自 XML 文件的信息(xml可以是一个文件，也可以是java,php等服务端程序返回来的xml)：




ajax加载xml案例代码

当用户点击上面的按钮，就会执行 loadXMLDoc() 函数。

loadXMLDoc() 函数创建 XMLHttpRequest 对象，添加当服务器响应就绪时执行的函数，并将请求发送到服务器。

当服务器响应就绪时，会构建一个 HTML 表格，从 XML 文件中提取节点（元素），最后使用已经填充了 XML 数据的 HTML 表格来更新 txtCDInfo 中的内容：


loadXMLDoc方法代码如下：

function loadXMLDoc(url)
{
var xmlhttp;
var txt,xx,x,i;
if (window.XMLHttpRequest)
  {// code for IE7+, Firefox, Chrome, Opera, Safari
  xmlhttp=new XMLHttpRequest();
  }
else
  {// code for IE6, IE5
  xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
  }
xmlhttp.onreadystatechange=function()
  {
  if (xmlhttp.readyState==4 && xmlhttp.status==200)
    {
    txt="<table border='1'><tr><th>Title</th><th>Artist</th></tr>";
    x=xmlhttp.responseXML.documentElement.getElementsByTagName("CD");
    for (i=0;i<x.length;i++)
      {
      txt=txt + "<tr>";
      xx=x[i].getElementsByTagName("TITLE");
        {
        try
          {
          txt=txt + "<td>" + xx[0].firstChild.nodeValue + "</td>";
          }
        catch (er)
          {
          txt=txt + "<td>&nbsp;</td>";
          }
        }
    xx=x[i].getElementsByTagName("ARTIST");
      {
        try
          {
          txt=txt + "<td>" + xx[0].firstChild.nodeValue + "</td>";
          }
        catch (er)
          {
          txt=txt + "<td>&nbsp;</td>";
          }
        }
      txt=txt + "</tr>";
      }
    txt=txt + "</table>";
    document.getElementById('txtCDInfo').innerHTML=txt;
    }
  }
xmlhttp.open("GET",url,true);
xmlhttp.send();
}

服务器返回的xml如下：
<?xml version="1.0" encoding="ISO-8859-1"?>
<!-- Edited by XMLSpy® -->
<CATALOG>
 <CD>
  <TITLE>Empire Burlesque</TITLE>
  <ARTIST>Bob Dylan</ARTIST>
  <COUNTRY>USA</COUNTRY>
  <COMPANY>Columbia</COMPANY>
  <PRICE>10.90</PRICE>
  <YEAR>1985</YEAR>
 </CD>
 <CD>
  <TITLE>Hide your heart</TITLE>
  <ARTIST>Bonnie Tyler</ARTIST>
  <COUNTRY>UK</COUNTRY>
  <COMPANY>CBS Records</COMPANY>
  <PRICE>9.90</PRICE>
  <YEAR>1988</YEAR>
 </CD>
 <CD>
  <TITLE>Greatest Hits</TITLE>
  <ARTIST>Dolly Parton</ARTIST>
  <COUNTRY>USA</COUNTRY>
  <COMPANY>RCA</COMPANY>
  <PRICE>9.90</PRICE>
  <YEAR>1982</YEAR>
 </CD>
 <CD>
  <TITLE>Still got the blues</TITLE>
  <ARTIST>Gary Moore</ARTIST>
  <COUNTRY>UK</COUNTRY>
  <COMPANY>Virgin records</COMPANY>
  <PRICE>10.20</PRICE>
  <YEAR>1990</YEAR>
 </CD>
 <CD>
  <TITLE>Eros</TITLE>
  <ARTIST>Eros Ramazzotti</ARTIST>
  <COUNTRY>EU</COUNTRY>
  <COMPANY>BMG</COMPANY>
  <PRICE>9.90</PRICE>
  <YEAR>1997</YEAR>
 </CD>
 <CD>
  <TITLE>One night only</TITLE>
  <ARTIST>Bee Gees</ARTIST>
  <COUNTRY>UK</COUNTRY>
  <COMPANY>Polydor</COMPANY>
  <PRICE>10.90</PRICE>
  <YEAR>1998</YEAR>
 </CD>
 <CD>
  <TITLE>Sylvias Mother</TITLE>
  <ARTIST>Dr.Hook</ARTIST>
  <COUNTRY>UK</COUNTRY>
  <COMPANY>CBS</COMPANY>
  <PRICE>8.10</PRICE>
  <YEAR>1973</YEAR>
 </CD>
 <CD>
  <TITLE>Maggie May</TITLE>
  <ARTIST>Rod Stewart</ARTIST>
  <COUNTRY>UK</COUNTRY>
  <COMPANY>Pickwick</COMPANY>
  <PRICE>8.50</PRICE>
  <YEAR>1990</YEAR>
 </CD>
 <CD>
  <TITLE>Romanza</TITLE>
  <ARTIST>Andrea Bocelli</ARTIST>
  <COUNTRY>EU</COUNTRY>
  <COMPANY>Polydor</COMPANY>
  <PRICE>10.80</PRICE>
  <YEAR>1996</YEAR>
 </CD>
 <CD>
  <TITLE>When a man loves a woman</TITLE>
  <ARTIST>Percy Sledge</ARTIST>
  <COUNTRY>USA</COUNTRY>
  <COMPANY>Atlantic</COMPANY>
  <PRICE>8.70</PRICE>
  <YEAR>1987</YEAR>
 </CD>
 <CD>
  <TITLE>Black angel</TITLE>
  <ARTIST>Savage Rose</ARTIST>
  <COUNTRY>EU</COUNTRY>
  <COMPANY>Mega</COMPANY>
  <PRICE>10.90</PRICE>
  <YEAR>1995</YEAR>
 </CD>
 <CD>
  <TITLE>1999 Grammy Nominees</TITLE>
  <ARTIST>Many</ARTIST>
  <COUNTRY>USA</COUNTRY>
  <COMPANY>Grammy</COMPANY>
  <PRICE>10.20</PRICE>
  <YEAR>1999</YEAR>
 </CD>
 <CD>
  <TITLE>For the good times</TITLE>
  <ARTIST>Kenny Rogers</ARTIST>
  <COUNTRY>UK</COUNTRY>
  <COMPANY>Mucik Master</COMPANY>
  <PRICE>8.70</PRICE>
  <YEAR>1995</YEAR>
 </CD>
 <CD>
  <TITLE>Big Willie style</TITLE>
  <ARTIST>Will Smith</ARTIST>
  <COUNTRY>USA</COUNTRY>
  <COMPANY>Columbia</COMPANY>
  <PRICE>9.90</PRICE>
  <YEAR>1997</YEAR>
 </CD>
 <CD>
  <TITLE>Tupelo Honey</TITLE>
  <ARTIST>Van Morrison</ARTIST>
  <COUNTRY>UK</COUNTRY>
  <COMPANY>Polydor</COMPANY>
  <PRICE>8.20</PRICE>
  <YEAR>1971</YEAR>
 </CD>
 <CD>
  <TITLE>Soulsville</TITLE>
  <ARTIST>Jorn Hoel</ARTIST>
  <COUNTRY>Norway</COUNTRY>
  <COMPANY>WEA</COMPANY>
  <PRICE>7.90</PRICE>
  <YEAR>1996</YEAR>
 </CD>
 <CD>
  <TITLE>The very best of</TITLE>
  <ARTIST>Cat Stevens</ARTIST>
  <COUNTRY>UK</COUNTRY>
  <COMPANY>Island</COMPANY>
  <PRICE>8.90</PRICE>
  <YEAR>1990</YEAR>
 </CD>
 <CD>
  <TITLE>Stop</TITLE>
  <ARTIST>Sam Brown</ARTIST>
  <COUNTRY>UK</COUNTRY>
  <COMPANY>A and M</COMPANY>
  <PRICE>8.90</PRICE>
  <YEAR>1988</YEAR>
 </CD>
 <CD>
  <TITLE>Bridge of Spies</TITLE>
  <ARTIST>T'Pau</ARTIST>
  <COUNTRY>UK</COUNTRY>
  <COMPANY>Siren</COMPANY>
  <PRICE>7.90</PRICE>
  <YEAR>1987</YEAR>
 </CD>
 <CD>
  <TITLE>Private Dancer</TITLE>
  <ARTIST>Tina Turner</ARTIST>
  <COUNTRY>UK</COUNTRY>
  <COMPANY>Capitol</COMPANY>
  <PRICE>8.90</PRICE>
  <YEAR>1983</YEAR>
 </CD>
 <CD>
  <TITLE>Midt om natten</TITLE>
  <ARTIST>Kim Larsen</ARTIST>
  <COUNTRY>EU</COUNTRY>
  <COMPANY>Medley</COMPANY>
  <PRICE>7.80</PRICE>
  <YEAR>1983</YEAR>
 </CD>
 <CD>
  <TITLE>Pavarotti Gala Concert</TITLE>
  <ARTIST>Luciano Pavarotti</ARTIST>
  <COUNTRY>UK</COUNTRY>
  <COMPANY>DECCA</COMPANY>
  <PRICE>9.90</PRICE>
  <YEAR>1991</YEAR>
 </CD>
 <CD>
  <TITLE>The dock of the bay</TITLE>
  <ARTIST>Otis Redding</ARTIST>
  <COUNTRY>USA</COUNTRY>
  <COMPANY>Atlantic</COMPANY>
  <PRICE>7.90</PRICE>
  <YEAR>1987</YEAR>
 </CD>
 <CD>
  <TITLE>Picture book</TITLE>
  <ARTIST>Simply Red</ARTIST>
  <COUNTRY>EU</COUNTRY>
  <COMPANY>Elektra</COMPANY>
  <PRICE>7.20</PRICE>
  <YEAR>1985</YEAR>
 </CD>
 <CD>
  <TITLE>Red</TITLE>
  <ARTIST>The Communards</ARTIST>
  <COUNTRY>UK</COUNTRY>
  <COMPANY>London</COMPANY>
  <PRICE>7.80</PRICE>
  <YEAR>1987</YEAR>
 </CD>
 <CD>
  <TITLE>Unchain my heart</TITLE>
  <ARTIST>Joe Cocker</ARTIST>
  <COUNTRY>USA</COUNTRY>
  <COMPANY>EMI</COMPANY>
  <PRICE>8.20</PRICE>
  <YEAR>1987</YEAR>
 </CD>
</CATALOG>

提示：建议还是用json的吧，json简单，格式简单，数据量小，读取也简单。
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