ajax遍历xml文档的方法
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2022-06-14 15:18:43
本文实例讲述了ajax遍历xml文档的方法。分享给大家供大家参考。具体分析如下:
xmlhttprequest对象提供了两个可以用来访问服务器响应的属性。第一个属性res...
本文实例讲述了ajax遍历xml文档的方法。分享给大家供大家参考。具体分析如下:
xmlhttprequest对象提供了两个可以用来访问服务器响应的属性。第一个属性responsetext将响应提供为一个串,第二个属性 responsexml将响应提供为一个xml对象。一些简单的用例就很适合按简单文本来获取响应,如将响应显示在警告框中,或者响应只是指示成功还是失 败的词
前面<ajax小结>中的例子是从xmlhttprequest对象获取服务器响应,并使用xmlhttprequest对象的responsetext属性将响应获取为文本。
这次我们来使用xmlhttprequest对象的responsexml属性,将结果获取为xml文档.这样一来,我们就可以使用w3c dom方法来遍历xml文档。(前面文章或多或少讲过些dom,在此不重复)
ok,下面来看例子.
首先还是一段xml文档代码(parsexml.xml)如下:
parsexml.xml如下:
<?xml version="1.0" encoding="utf-8"?> <states> <north> <state>minnesota</state> <state>iowa</state> <state>north dakota</state> </north> <south> <state>texas</state> <state>oklahoma</state> <state>louisiana</state> </south> <east> <state>new york</state> <state>north carolina</state> <state>massachusetts</state> </east> <west> <state>california</state> <state>oregon</state> <state>nevada</state> </west> </states>
myjsp.jsp如下:
<%@ page language="java" import="java.util.*" pageencoding="utf-8"%> <% string path = request.getcontextpath(); string basepath = request.getscheme()+"://"+request.getservername()+":"+request.getserverport()+path+"/"; %> <!doctype html public "-//w3c//dtd html 4.01 transitional//en"> <html> <head> <base href="<%=basepath%>"> <title>my jsp 'myjsp.jsp' starting page</title> <meta http-equiv="pragma" content="no-cache"> <meta http-equiv="cache-control" content="no-cache"> <meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="this is my page"> <!-- <link rel="stylesheet" type="text/css" href="styles.css"> --> </head> <script type="text/javascript"> var flg=false; var requesttype = ""; //得到xmlhttprequest对象 function newxmlhttprequest() { var xmlreq = false; if (window.xmlhttprequest) { xmlreq = new xmlhttprequest(); } else if (window.activexobject) { try { xmlreq = new activexobject("msxml2.xmlhttp"); } catch (e1) { try { xmlreq = new activexobject("microsoft.xmlhttp"); } catch (e2) {} } } return xmlreq; } function startrequest(requestedlist){ requesttype=requestedlist; flg=newxmlhttprequest(); //当xmlhttprequest对象在请求过程中间状态改变的时候 //回来调用handlestatechange方法 flg.onreadystatechange = handlestatechange; flg.open("get", "parsexml.xml", true); flg.send(null); } //处理函数 function handlestatechange(){ if(flg.readystate==4){ if(flg.status==200){ if(requesttype=="north"){ listnorthstates(); }else if(requesttype=="all"){ listallstates(); }if(requesttype=="south"){ listsouthstates(); } } } } //用于显示northstates方法 function listnorthstates(){ var xmldoc=flg.responsexml; var northnode=xmldoc.getelementsbytagname("north")[0]; var northstates=northnode.getelementsbytagname("state"); outputlist("north states",northstates); } //用于显示southstates方法 function listsouthstates(){ var xmldoc=flg.responsexml; var southnode=xmldoc.getelementsbytagname("south")[0]; var southstates=southnode.getelementsbytagname("state"); outputlist("south states",southstates); } //用于显示allstates方法 function listallstates(){ var xmldoc=flg.responsexml; var allstates=xmldoc.getelementsbytagname("state"); outputlist("all states in document", allstates); } //输出元素并显示于提示框中 function outputlist(title,states){ var out=title; var currstate=null; for(var i=0;i<states.length;i++){ currstate=states; out=out+"\n-"+currstate.childnodes[0].nodevalue; } alert(out); } </script> <body> <form action="#"> <input type="button" value="view all listed states" onclick="startrequest('all');"/><br> <input type="button" value="view all listed northern states" onclick="startrequest('north');"/><br> <input type="button" value="view all listed southern states" onclick="startrequest('south');"/> </form> </body> </html>
希望本文所述对大家的ajax程序设计有所帮助。