ajax遍历xml文档的方法
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W3CDOM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:
<?xmlversion="1.0"encoding="UTF-8"?> <states> <north> <state>Minnesota</state> <state>Iowa</state> <state>NorthDakota</state> </north> <south> <state>Texas</state> <state>Oklahoma</state> <state>Louisiana</state> </south> <east> <state>NewYork</state> <state>NorthCarolina</state> <state>Massachusetts</state> </east> <west> <state>California</state> <state>Oregon</state> <state>Nevada</state> </west> </states>
MyJsp.jsp如下:
<%@pagelanguage="java"import="java.util.*"pageEncoding="utf-8"%> <% Stringpath=request.getContextPath(); StringbasePath=request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> <!DOCTYPEHTMLPUBLIC"-//W3C//DTDHTML4.01Transitional//EN"> <html> <head> <basehref="<%=basePath%>"> <title>MyJSP'MyJsp.jsp'startingpage</title> <metahttp-equiv="pragma"content="no-cache"> <metahttp-equiv="cache-control"content="no-cache"> <metahttp-equiv="expires"content="0"> <metahttp-equiv="keywords"content="keyword1,keyword2,keyword3"> <metahttp-equiv="description"content="Thisismypage"> <!-- <linkrel="stylesheet"type="text/css"href="styles.css"> --> </head> <scripttype="text/javascript"> varflg=false; varrequestType=""; //得到XMLHttpRequest对象 functionnewXMLHttpRequest(){ varxmlreq=false; if(window.XMLHttpRequest){ xmlreq=newXMLHttpRequest(); }elseif(window.ActiveXObject){ try{ xmlreq=newActiveXObject("Msxml2.XMLHTTP"); }catch(e1){ try{ xmlreq=newActiveXObject("Microsoft.XMLHTTP"); }catch(e2){} } } returnxmlreq; } functionstartRequest(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 functionhandleStateChange(){ if(flg.readyState==4){ if(flg.status==200){ if(requestType=="north"){ listNorthStates(); }elseif(requestType=="all"){ listAllStates(); }if(requestType=="south"){ listSouthStates(); } } } } //用于显示NorthStates方法 functionlistNorthStates(){ varxmlDoc=flg.responseXML; varnorthNode=xmlDoc.getElementsByTagName("north")[0]; varnorthStates=northNode.getElementsByTagName("state"); outputList("NorthStates",northStates); } //用于显示SouthStates方法 functionlistSouthStates(){ varxmlDoc=flg.responseXML; varSouthNode=xmlDoc.getElementsByTagName("south")[0]; varSouthStates=SouthNode.getElementsByTagName("state"); outputList("SouthStates",SouthStates); } //用于显示AllStates方法 functionlistAllStates(){ varxmlDoc=flg.responseXML; varallStates=xmlDoc.getElementsByTagName("state"); outputList("AllStatesinDocument",allStates); } //输出元素并显示于提示框中 functionoutputList(title,states){ varout=title; varcurrState=null; for(vari=0;i<states.length;i++){ currState=states; out=out+"\n-"+currState.childNodes[0].nodeValue; } alert(out); } </script> <body> <formaction="#"> <inputtype="button"value="ViewAllListedStates" onclick="startRequest('all');"/><br> <inputtype="button"value="ViewAllListedNorthernStates" onclick="startRequest('north');"/><br> <inputtype="button"value="ViewAllListedSouthernStates" 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。