dtree树.可以动态加载节点

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     function Node(name,url,ico,iconOpen,display,guid,type,hasChild)
{
   this.id = NaN;
this.name = name;
this.url = !url ? this.name : "<a href=""+this.url+"" mce_href="&quot;+this.url+&quot;""+  (this.config.target ? "target='"+this.config.target+"'":'')+ (this.config.useStatusText?" onmouseover=\"window.status='"+ this.name + "';return true;\" onmouseout=\"window.status='';return true;\"" :'' ) + " ></a>"+this.name+"</a>";
this.ico = ico;
this.iconOpen = iconOpen;
this.Childs = [];
this.display = display;
this.guid = guid;
this.type = type;
this.tree = NaN;
this.parent = NaN;
this.depth = NaN;
this.hasLoad = !(hasChild == undefined || hasChild) ;
this.innerHTML = null;
}
   
function Tree()
{
this.ParentNode = NaN;
this.Ident = [];
this.index = NaN;
this.selectedNode = null;
}
   
Node.prototype.Icons = {
root	 : 'img/base.gif',
folder	 : 'img/folder.gif',
folderOpen	: 'img/folderopen.gif',
node	 : 'img/page.gif',
empty	 : 'img/empty.gif',
line	 : 'img/line.gif',
join	 : 'img/join.gif',
joinBottom	: 'img/joinbottom.gif',
plus	 : 'img/plus.gif',
plusBottom	: 'img/plusbottom.gif',
minus	 : 'img/minus.gif',
minusBottom	: 'img/minusbottom.gif',
nlPlus	 : 'img/nolines_plus.gif',
nlMinus	 : 'img/nolines_minus.gif'
}
Node.prototype.config = {
   target : 'child',
   useSelection  : true,
   closeSameLevel : true,
   useStatusText  : true
}
   
Node.prototype.AddNode = function(name,url,ico,iconOpen,display,guid,type,hasChild)
{
var node = new Node(name,url,ico,iconOpen,display,guid,type,hasChild); 
node.parent = this;
node.tree = this.tree;
node.depth = this.depth+1;
this.hasLoad = true;
node.id = ++this.tree.index;
this.Childs[this.Childs.length] = node;
};
Tree.prototype.Show = function(id)
{
   this.SelectNode(this.ParentNode,id);
   this.selectedNode.display = true;
   if(!this.selectedNode.hasLoad)
   {
      this.selectedNode.Load();
   }
   else
   {    
       this.selectedNode.innerHTML = this.selectedNode.toString();
       this.selectedNode = null;
       DrawTree();	        
   }
}
Tree.prototype.Close = function(id)
{
   this.SelectNode(this.ParentNode,id);
   this.selectedNode.display = false;
   this.selectedNode = null;
   document.getElementById("div1").innerHTML = tree;
}
   
Node.prototype.CloseAll = function()
{
this.display = false;
}
Node.prototype.Load = function()
{
   var xmlHttp = window.ActiveXObject ? new ActiveXObject("microsoft.XMLHTTP") : new XMLHttpRequest();
   var url =  "GetTreeNode.ashx?type=" +this.type+"&guid="+this.guid;
   xmlHttp.open('GET',url,true);
   xmlHttp.onreadystatechange = function()
   {
       if(xmlHttp.readyState == 4 )
       {   
           if(xmlHttp.status == 200)
           {
       	    var xmlDoc = xmlHttp.responseXML;
       	    var root = xmlDoc.documentElement;
       	    if(root != null)
       	    {
       	        for(var i=0;i<root.childNodes.length;i++)
       	        {
       	            var node = root.childNodes[i];
       	            var hasChild = node.childNodes[3].text == 'true' ? true:false;
       	            tree.selectedNode.AddNode(node.childNodes[0].text,'1','folder','folderOpen',false,node.childNodes[1].text,node.childNodes[2].text,hasChild);
       	        }
       	    }
       	    tree.selectedNode.hasLoad = true;
       	    tree.selectedNode.innerHTML = tree.selectedNode.toString();
       	    tree.selectedNode = null;
       	    DrawTree();
       	}
       }
   }
      xmlHttp.send(null);
}
   
Node.prototype.ShowAll = function()
{
for(var i=0;i<this.Childs.Length;i++)
{
this.Childs[i].display = true;
}
}
   
//本来想通过递归循环的方式去实现，发现挺麻烦的。
Node.prototype.toString = function()
{
var str ="<div class='dTreeNode'>";
for(var i=0;i<this.depth;i++)
{
str += "<img src="" + (this.tree.Ident[i] == 0? this.Icons.line:this.Icons.empty)+"" mce_src="&quot; + (this.tree.Ident[i] == 0? this.Icons.line:this.Icons.empty)+&quot;" />";
}
if( this.depth == 0 )
{
str += this.display ? "<a href="javascript:tree.Close(0);" mce_href="javascript:tree.Close(0);" ><img src= '"+this.Icons.nlMinus+"'/></a>" : "<a href="javascript:tree.Show(0);" mce_href="javascript:tree.Show(0);" ><img src= '"+this.Icons.nlPlus+"'/></a>";
}
else
{
   if(this.Childs.length == 0 && this.hasLoad)
   {
       str += (this.tree.Ident[this.depth] == 0 ? "<img src= 'img/join.gif' />" : "<img src= 'img/joinbottom.gif' />" ) ;
   } 
   else
   {
       str += this.display ? "<a href="javascript:tree.Close("+this.id+");" mce_href="javascript:tree.Close(&quot;+this.id+&quot;);" ><img src=""+(this.tree.Ident[this.depth] == 0? "img/minus.gif" mce_src="&quot;+(this.tree.Ident[this.depth] == 0? &quot;img/minus.gif" />" :"img/minusbottom.gif'  />")  : "<a href="javascript:tree.Show("+this.id+");" mce_href="javascript:tree.Show(&quot;+this.id+&quot;);" ><img src=""+(this.tree.Ident[this.depth] == 0? "img/plus.gif" mce_src="&quot;+(this.tree.Ident[this.depth] == 0? &quot;img/plus.gif"  />" :"img/plusbottom.gif'  />") ;
       str += "</a>";
   }
}
str +=  "<img src= '"+this.Icons[this.display? this.iconOpen:this.ico] +"'/>";
str += this.url;
str += "</div>"
if(this.display)
{
   for(var i=0;i<this.Childs.length;i++)
   {
   this.tree.Ident[this.depth+1] = (i == this.Childs.length-1 ? 1:0);
   str += this.Childs[i].toString();
   }
}
this.innerHTML = str;
return str;
}
Tree.prototype.toString = function()
{
var str = "<div class='dtree'>";
str += this.ParentNode.toString();
str += "</div>";
return str;
} 
Tree.prototype.SelectNode = function(node,id)
{
   if(node.id == id)
   {
       this.selectedNode = node;
       return;
   }
   
   for(var i=0;i<node.Childs.length;i++)
   {
       this.SelectNode(node.Childs[i],id);
       if(this.selectedNode != null)
       {
           return;
       }
   }
}
   
Tree.prototype.InitParent = function(node)
{
node.parent = NaN;
node.id = 0;
node.depth = 0;
node.tree = this;
this.index = 0;
this.Ident[0] = 1;
this.ParentNode = node;
}  
function DrawTree()
{
            document.getElementById("div1").innerHTML = tree;
}
function LoadAll(node)
{
   if(!node.hasLoad)
   {
       tree.Show(node.id);
   }
   for(var i=0;i<node.Childs.length;i++)
   {
       LoadAll(node.Childs[i]);
   }
}

        protected void Page_Load(object sender, EventArgs e)
        {
            string str = System.Configuration.ConfigurationManager.AppSettings["sqlConnect"];
            DataSet ds = new DataSet();
            System.Text.StringBuilder sb = new System.Text.StringBuilder();
            using (SqlConnection con = new SqlConnection(System.Configuration.ConfigurationManager.AppSettings["sqlConnect"]))
            {
                try
                {
                    con.Open();
                    SqlDataAdapter adp = new SqlDataAdapter("select top 2 * from province;select * from city;select * from area",con);
                    adp.Fill(ds);
                    sb.Append("<mce:script type='text/javascript' defer='defer'><!--
");
                    sb.Append("var tree = new Tree();");
                    sb.Append("tree.InitParent(new Node('全国省市','1','root','root',true,'1','1'));");
                    DataTable dtProc = ds.Tables[0];
                   </p>
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