ajax中responseXML对xml文档的处理问题

danwell7 2012-09-14 01:59:07

<script language="javascript" src="MyScripts/ajax.js"></script>

<script type="text/javascript">

   window.onload = function () {

            ajax({

                url: "rss.xml",      

           onSuccess: function( rss ){

                 

                var feed = document.getElementById( "feed" );

       

       var titles=rss.getElementsByTagName( "title" );

      

       for(var i=0; i < titles.length; i++ ){

         var li=document.createElement( "li" );

         li.innerHTML=titles[i].firstChild.nodeValue;

         

         feed.appendChild(li);

       }

     }

   

   });

   };

</script>

</head>



<body>

<h1> Dynamic RSS Feed widget</h1>

<p>check out my RSS Feed:</p>

  <ol id="feed"> </ol>



</body>

</html>

上面的是把rss.xml中的title元素的孩子节点显示在id="feed"处, ajax执行成功，
responseXML返回是rss.xml文档，赋给function( rss )中的参数。xml文档没问题，
为什么这儿提示"...getElementsByTagName"对象不存在这样的方法或属性？ajax返回的
xml文档不能用getElementsByTagName解析吗？？

...全文

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斯洛文尼亚旅游 2012-09-14

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onSuccess的参数你是传递了ajax对象的responseText还是responseXML？responseText是字符串，当然没有getElementsByTaName，需要传递responseXML

danwell7 2012-09-14

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这是MyScripts/ajax.js：

var XMLHttp=function(){
if( window.XMLHttpRequest ){
return new XMLHttpRequest();
}else{
return new ActiveXObject("Microsoft.XMLHTTP");
}
};

function ajax ( muti_option){
muti_option={
type: muti_option.type || "post",
url: muti_option.url || "",
timeout: muti_option.timeout || 5000,
onComplete: muti_option.onComplete || function (){},
onError: muti_option.onError || function (){},
onSuccess: muti_option.onSuccess || function (){},
data:　muti_option.data || ""　　　

};

var xmlhttp = new XMLHttp();
xmlhttp.open( muti_option.type, muti_option.url, true);
xmlhttp.setRequestHeader("Content-type","text/xml");
var timeoutlength = muti_option.timeout;
var requestDone = false;
setTimeout( function(){ return requestDone = true },timeoutlength );
xmlhttp.onreadystatechange = function() {

if( xmlhttp.readyState == 4 && ! requestDone) {

if( httpSuccess( xmlhttp ) ){

muti_option.onSuccess( httpData( xmlhttp, muti_option.type));

}else{
muti_option.onError();
}
muti_option.onComplete();
xmlhttp=null;
}

};

xmlhttp.send();

function httpSuccess( xmlhttp ){
try{

return !xmlhttp.status && location.protocol == "file" ||
( xmlhttp.status >= 200 && xmlhttp.status < 300 ) ||
xmlhttp.status == 304 || navigator.userAgent.indexOf( "safari" ) >0
&& typeof xmlhttp.status == "undefined";

}catch(e){
return false ;//表明请求失败
}
}

function httpData( xmlhttp,type ){
var ct=xmlhttp.getResponseHeader( "content-type" );
var data=!type && ct && ct.indexOf("xml")> 0;
data= type == "xml" || data ? xmlhttp.responseXML : xmlhttp.responseText;
if( type== "script")
eval.call( window,data );
return data;
}

}

danwell7 2012-09-14