一個ajax的例子

來源:互聯網
上載者:User

html :

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE> New Document </TITLE>
<META NAME="Generator" CONTENT="EditPlus">
<META NAME="Author" CONTENT="">
<META NAME="Keywords" CONTENT="">
<META NAME="Description" CONTENT="">
<script type="text/javascript" src="xmlhttprequest.js"></script>
</HEAD>

<BODY>
<div id="see">

</div>
<input type="button" onclick="sendRequest()" value="SendRequest">
<script>

var xmlhttp = new XMLHttpRequest();
var xmldoc;
function sendRequest(){  
  document.all("see").innerHTML = "Loading....";  
  var url = "http://localhost:8080/tree.xml";
  xmlhttp.open("GET",url,true);
  xmlhttp.onreadystatechange = viewPage;  
  xmlhttp.send(null);
}
function viewPage(){  
  
  if (xmlhttp.readyState == 4 && xmlhttp.status==200) {
   alert("haha get xml ")
   xmldoc = xmlhttp.responseXML;
   var xmlobj = xmldoc.documentElement;
   var str = "";
   for(var i = 0; i< xmlobj.childNodes.length;i++){
    var node = xmlobj.childNodes[i];
    var text = node.getAttribute("nodeid");
    var value =  text;
    str += "<span style='display:block'  onclick='getsub(\""+value+"\")'>"+text+"</span><br><div style='display:none' id="+text+"></div>";
   }
   document.all.see.innerHTML = str;
   //alert(xmlobj.tagName)
  }
}

function getsub(id){
  if(xmldoc!=null){
   var root = xmldoc.getElementsByTagName("TreeNode");
   var str2 = "";
   for(var k = 0;k<root.length;k++){    
    if(root[k].getAttribute("nodeid")==id){
     document.all(id).style.display = '';
     document.all(id).innerHTML = "loading..."
     alert("get sub tree")
     var nodes = root[k].childNodes;
     for(var m = 0;m<nodes.length;m++){
      var node = nodes[m];
      var text = node.getAttribute("nodeid");      
      str2 += "<span  onclick='getsub(\""+text+"\")'>&nbsp;&nbsp;"+text+"</span><br><div style='display:none' id="+text+"></div>";
     }    
     document.all(id).innerHTML = str2 ;//alert(document.all(id).innerHTML)
    }
    
   }
  }else{
   alert("Exception!!");
  }
}

</script>
</BODY>
</HTML>
需要訪問的xml:

<?xml version="1.0" encoding="ISO-8859-1"?>
<Tree>
<TreeNode nodeid="wangzhongjie">
<TreeNode nodeid="wang"></TreeNode>
<TreeNode nodeid="zhong"></TreeNode>
<TreeNode nodeid="jie"></TreeNode>
</TreeNode>
<TreeNode nodeid="yinhang">
<TreeNode nodeid="yin"></TreeNode>
<TreeNode nodeid="hang"></TreeNode>
</TreeNode>
</Tree>

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