在Ajax中使用XML通信

web游览器中的javascript冰没有一个通用的xml解析器用，xhr对象可以帮助我们解析xml响应！

客户端代码如下：

<html>
<head>
<title>Hello Ajax version 6</title>
<style type='text/css'>
* { font-family: Tahoma,Arial,sans-serif; }
#helloTitle{ color: #48f; }
.sidebar{
  background-color: #adf;
  color: navy;
  border: solid blue 1px;
  width: 180px;
  height: 200px;
  padding: 2px;
  margin: 3px;
  float: left;
}
</style>
<script type='text/javascript' src='prototype.js'></script>
<script type='text/javascript'>
window.onload=function(){
  $('helloBtn').onclick=function(){
    var name=$('helloTxt').value;
    new Ajax.Request(
      "hello6.jsp?name="+encodeURI(name),{
        method:"get",onComplete:function(xhr){
          var responseDoc=xhr.responseXML;  //读取xml响应 从以前的responseText换的
          update(responseDoc);
        }
      }
    );
  }
}

function update(doc){//读取xml中的每一个元素，然后把数据转换为html语言呈现出来
	
  var personNode=doc.getElementsByTagName('person')[0]; //获得第一个person 节点
  
  var initial=personNode.getAttribute('initial');//利用getAttribute()函数通过名称获取属性的值
  
  var nameNode=personNode.getElementsByTagName('name')[0];
  
  var name=nameNode.firstChild.data;
  
  var likesNode=personNode.getElementsByTagName('likes')[0];
  
  var likesList=likesNode.getElementsByTagName('item');//很明显的是一个数组
  
  var likes=[];
  
  for (var i=0;i<likesList.length;i++){
	  
    var itemNode=likesList[i];
	
    likes[i]=itemNode.firstChild.data;
	
  }
  var recipeNode=personNode.getElementsByTagName('recipe')[0];
  
  var recipeNameNode=recipeNode.getElementsByTagName('name')[0];
  
  var recipeName=recipeNameNode.firstChild.data;
  
  var recipeSuggestNode=recipeNode.getElementsByTagName('serving-suggestion')[0];
  
  var recipeSuggest=recipeSuggestNode.firstChild.data;
  
  var ingredientsList=recipeNode.getElementsByTagName('ingredient');
  
  var ingredients={};
  
  for(var i=0;i<ingredientsList.length;i++){
	  
    var ingredientNode=ingredientsList[i];
    var qty=ingredientNode.getAttribute("qty");
    var iname=ingredientNode.firstChild.data;
    ingredients[iname]=qty;
	
  }
  <!--下边的jquery代码就是装配HTML的  语句-->
  $('helloTitle').innerHTML="<h1>Hello,<b><i>"+name+"</i></b></h1>";
  var likesHTML='<h5>'+initial+' likes...</h5><hr/>';
  for (var i=0;i<likes.length;i++){
    likesHTML+=likes[i]+"<br/>";
  }
  $('likesList').innerHTML=likesHTML;
  var recipeHTML='<h5>'+initial+'\'s favorite recipe is '+recipeName+'</h5>';
  for (key in ingredients){
    recipeHTML+=key+" : "+ingredients[key]+"<br/>";
  }
  recipeHTML+='<br/><i>'+recipeSuggest+'</i>';
  $('ingrList').innerHTML=recipeHTML;
}

</script>
</head>
<body>

<div id='likesList' class='sidebar'>
<h5>Likes</h5><hr/>
</div>
<div id='ingrList' class='sidebar'>
<h5>Ingredients</h5><hr/>
</div>
<div>
<div id='helloTitle'>
<h1>Hello,stranger</h1>
</div>
<p>Please introduce yourself by entering your name in the Box below</p>
<input type='text' size='24' id='helloTxt'></input><button id='helloBtn'>Submit</button>
</div>
</body>

</html>

jsp代码如下：（很明显的就是一个用xml写的）

<%--
simple JSP to generate some questions - and answers--%>
<jsp:directive.page contentType="text/xml"/>
<%
String name=request.getParameter("name");
%>
<person initial="<%=name.substring(0,1).toUpperCase()%>">
 <name><![CDATA[<%=name%>]]></name>
 <likes>
  <item>JavaScript</item>
  <item>Skiing</item>
  <item>Apple Pie</item>
 </likes>  
 <recipe>
  <name>apple pie</name>
  <ingredient qty="3kg">apples</ingredient>
  <ingredient qty="1kg">sugar</ingredient>
  <ingredient qty="2.4kg">pastry</ingredient>
  <serving-suggestion><![CDATA[Best Eaten Outdoors! Mmm!]]></serving-suggestion>
 </recipe>
</person>

另外我们还要用到prototype.js的封装集；

然后我们就可以完成通信了！

原文链接：https://www.f2er.com/ajax/165052.html

在Ajax中使用XML通信

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