灵活调用xsl来解析xml文档(js异步)_XHTML/WEB_黑客防线网安服务器维护基地--Powered by WWW.RONGSEN.COM.CN

灵活调用xsl来解析xml文档(js异步)

作者:黑客防线网安XML教程基地 来源:黑客防线网安XML教程基地 浏览次数:0

本篇关键词:文档解析调用灵活
黑客防线网安网讯:       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...

       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。

       演示:http://www.21cz.cn/xmltest/test.htm

       xml文件查看:http://www.21cz.cn/xmltest/hello.xml
       xsl文件查看:http://www.21cz.cn/xmltest/hello.xsl

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