ajax.js

很好用得tree。也很简单。里面只有3个文件。

var req = new function()
{
	this.xhr = null;
	this.xmldata = null; //xml数据
	this.userid = null;
	
  this.createInstance = function() 
  {
	var instance = null;
	try 
	{
	    instance = new ActiveXObject("Msxml2.XMLHTTP");
	}
	catch(e) 
	{
		try 
		{
		 instance = new ActiveXObject("Microsoft.XMLHTTP");
		}
		catch(E) 
		{
		 instance = false;
		}
	}
	
	if(!instance && typeof XMLHTTPRequest != 'undefined') 
	{
	 	instance = new XMLHTTPRequest();
		if (instance.overrideMimeType)
		{
            instance.overrideMimeType="text/xml";
        }
	}
	return instance;
  }
 
    this.getxmldata= function() 
    {
		this.userid = arguments[0];
 		xhr = this.createInstance();
 	    xhr.onreadystatechange=this.buildxmltree;
 	    xhr.open("GET","/getdatafromXML?userid="+arguments[0],true);
 	    xhr.send(null);
 	}
 	
 	this.buildxmltree = function() //构建tree
 	{
 		if(xhr.readyState==4) 
 		{ 
 			if(xhr.status==200)
 			{
 				req.xmldata = xhr.responseText;
 				var o = new ActiveXObject('Microsoft.XMLDOM');
 				o.async = false;
 				o.loadXML(req.xmldata);
			    req.doXMLMsg(o);
 			}
 			else 
 			{
 				//deal the error here
 			}
 		}
 	}

	this.doXMLMsg = function(obj) 
 	{//解释见treeview.js
 		treeview.data = obj;
 		treeview.xhr = req.xhr;
 		treeview.userid = req.userid;
 		treeview.init();
 	}
 	
}