灵活调用xsl来解析xml文档(js异步)

互联网 17-2-27
1.新建一个vs2003的web工程,取名为xmlTest

2.将工程目录下的WebForm1.aspx中内容全部删除,只留下顶部的一条语句:

<%@ Page language="c#" Codebehind="WebForm1.aspx.cs" AutoEventWireup="false" Inherits="XMLTest.WebForm1" %>

3.修改WebForm1.aspx.cs中内容,在Page_Load中加入:

以下是引用片段:

    XmlDocument doc=new XmlDocument();       String xmlfile=string.Empty;       xmlfile=Context.Request.PhysicalapplicationPath+(Request.QueryString["sel"].ToString()=="xml"?"\\hello.xml":"\\hello.xsl");       doc.Load(xmlfile);       Response.Write(doc.InnerXml);

4.在工程根目录下新增test.htm,并设为工程首页:

以下是引用片段:

<html>   <head>     <title></title>   </head>   <body>     <div id="resTree"></div>     <FONT face="宋体"></FONT><input type="button" value="执行" onclick="GetXml()"><BR>     <script language="JScript">     var srcTree,xsltTree,xt;     var http_request = false;           function GetXml()     {          srcTree = new ActiveXObject("Msxml2.FreeThreadedDOMDocument");       srcTree.async=false;       xsltTree= new ActiveXObject("Msxml2.FreeThreadedDOMDocument");       xsltTree.async = false;       xt=new ActiveXObject("MSXML2.XSLTemplate");      resTree.innerHTML="";       makeRequest("WebForm1.aspx?sel=xml",GetXml_CB);     }              function makeRequest(url,callback) {           http_request = false;           if (window.xmlhttpRequest) { // Mozilla, Safari,...               http_request = new XMLHttPRequest();               if (http_request.overrideMimeType) {                   http_request.overrideMimeType('text/xml');               }           } else if (window.ActiveXObject) { // IE               try {                   http_request = new ActiveXObject("Msxml2.XMLHTTP");               } catch (e) {                   try {                       http_request = new ActiveXObject("Microsoft.XMLHTTP");                   } catch (e) {}               }           }          if (!http_request) {               alert('Giving up :( Cannot create an XMLHTTP instance');               return false;           }           http_request.onreadystatechange = callback;           http_request.open('GET', url, true);           http_request.send(null);       }      function GetXml_CB() {          if (http_request.readyState == 4) {               if (http_request.status == 200) {           srcTree.loadXML(http_request.responseText);       makeRequest("WebForm1.aspx?sel=xsl",GetXsl_CB);               } else {                   alert('There was a problem with the request.');               }           }      }              function GetXsl_CB(){          if (http_request.readyState == 4) {            if (http_request.status == 200) {          xsltTree.loadXML(http_request.responseText);          xt.stylesheet=xsltTree;          var proc=xt.createProcessor();          proc.input=srcTree;          proc.transform();          resTree.innerHTML=proc.output;               } else {                   alert('There was a problem with the request.');               }           }            }      function makeRequest(url,callback) {        http_request = false;        if (window.XMLHttpRequest) { // Mozilla, Safari,...               http_request = new XMLHttpRequest();               if (http_request.overrideMimeType) {                   http_request.overrideMimeType('text/xml');               }           } else if (window.ActiveXObject) { // IE               try {                   http_request = new ActiveXObject("Msxml2.XMLHTTP");               } catch (e) {                   try {                       http_request = new ActiveXObject("Microsoft.XMLHTTP");                   } catch (e) {}               }           }          if (!http_request) {               alert('Giving up :( Cannot create an XMLHTTP instance');               return false;           }           http_request.onreadystatechange = callback;           http_request.open('GET', url, true);           http_request.send(null);       }    </script>  </body>   </html>

5.运行工程,看看效果吧!

hello.xml(注意:我的xml文档中并没有指定对应的xsl解析文件名)

以下是引用片段:

<?xml version='1.0'?>  <breakfast-menu>     <food>       <name>Belgian Waffles</name>       <price>$5.95</price>       <description>Two of our famous Belgian Waffles          with plenty of real maple syrup.</description>       <calories>650</calories>     </food>     <food>       <name>Strawberry Belgian Waffles</name>       <price>$7.95</price>       <description>Light Belgian waffles covered with         strawberries and whipped cream.</description>       <calories>900</calories>     </food>     <food>       <name>Berry-Berry Belgian Waffles</name>       <price>$8.95</price>       <description>Light Belgian waffles covered          with an assortment of fresh berries          and whipped cream.</description>       <calories>900</calories>     </food>     <food>       <name>French Toast</name>       <price>$4.50</price>       <description>Thick slices made from our homemade         sourdough bread.</description>       <calories>600</calories>     </food>     <food>       <name>Homestyle Breakfast</name>       <price>$6.95</price>       <description>Two eggs, bacon or sausage, toast,          and our ever-popular hash browns.</description>       <calories>950</calories>     </food>   </breakfast-menu>

hello.xsl

以下是引用片段:

<?xml version="1.0"?>   <xsl:stylesheet version="1.0"  xmlns:xsl="http://www.w3.org/1999/XSL/Transform">     <xsl:template match="/breakfast-menu">          <xsl:for-each select="food">             <DIV STYLE="background-color:teal; color:white; padding:4px">               <SPAN STYLE="font-weight:bold; color:white"><xsl:value-of select="name"/></SPAN>               至 <xsl:value-of select="price"/>             </DIV>             <DIV STYLE="margin-left:20px; margin-bottom:1em; font-size:10pt">               <xsl:value-of select="description"/>               <SPAN STYLE="font-style:italic">                 <xsl:value-of select="calories"/> 嘿嘿               </SPAN>             </DIV>           </xsl:for-each>    </xsl:template>   </xsl:stylesheet>

xml文档只有纯粹的数据,如果需要显示到html页面中的话,一般需要使用定制的xsl文档来解析,或者手工通过js来读取xml中的值显示到html中的dom树中,当使用xsl文档来解析时,相应的xml文档中必须指定对应的xsl文档才能正常显示,但当有些程序动态输出xml文档时,并没有指定相应的xsl文档,这时就必须通过其它途径来加载相应的xsl文档来解析,当然,在服务器端输出xml文档时,通过一些xml api也可以实现,我这儿描述的是通过js来实现的一种方式。用这种方式的话,就抛开了服务器平台的限制,服务器端只需要输出相应的xml文档(.net/j2ee都可以),并且将对应的xsl文档输出给客户端(可以输出流或直接在客户端加载xsl文档)。

这里有几个需要注意的地方,我们一般是使用Msxml2.Document组件来加载xml文档的,但当动态使用xsl解析xml文档时,必须使用Msxml2.FreeThreadedDOMDocument这种自由线程的组件,同时使用MSXML2.XSLTemplate模板组件来加载xml,xsl数据,通过MSXML2.XSLTemplate的transform方法,就可以动态的用xsl来解析xml数据了,另外,IE5开始,系统默认的xml组件是msxml2,如果需要使用更新的msxml组件需要安装更新的msxml组件包,并指定新的名称,例如Msxml2.FreeThreadedDOMDocument.4.0,现在最新的msxml组件是6.0beta,可在M$网站下载。

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