使用yahoo雅虎js库（YUI）建立无刷新的N级树（可添加删除节点）

1、首先你要去下面地址下载yahoo类库
    http://developer.yahoo.com/yui/
    2。5版本的 8。84M，你可以不全用，只用树的
2、然后需要把yui/build/treeview/文件夹下面的文件复制到你的工程

3、需要引用下面的js

<link rel="stylesheet" type="text/css" href="/yui/build/treeview/assets/skins/sam/treeview.css"/>
   <link rel="stylesheet" type="text/css" href="/yui/build/menu/assets/skins/sam/menu.css">

   <script type="text/javascript" src="/yui/build/yahoo/yahoo.js"></script>

   <script type="text/javascript" src="/yui/build/event/event.js"></script>

   <script type="text/javascript" src="/yui/build/treeview/treeview.js"></script>

  
   <!-- Dependency source files-->

   <script type="text/javascript" src="/yui/build/yahoo-dom-event/yahoo-dom-event.js"></script>

   <script type="text/javascript" src="/yui/build/container/container_core.js"></script>

   <!-- Menu source file-->

   <script type="text/javascript" src="/yui/build/menu/menu.js"></script>

页面html代码

 <divclass="yui-skin-sam">
                                       <divid="treeDiv1">
                                       </div>
                                   </div>

所有的js代码

<script type="text/javascript">

   var channelId=0;
   var treeId=0;
   function LoadChannelTree(obj)
   {
      channelId=obj.value;
      if (channelId!=0)
      {
          var ds_Normal=AjaxForTree.GetTree(channelId).value;
         
          if(ds_Normal!=null&&typeof(ds_Normal)=="object"&& ds_Normal.Tables.length!=0&& ds_Normal.Tables[0].Rows.length!=0)
          {
             treeId=ds_Normal.Tables[0].Rows[0].TreeId;
             treeInit();
             //alert(treeId);
          }
          else
          {
            treeId=0;
            document.getElementById("treeDiv1").innerHTML="<a href='#' style='text-decoration:underline;' onclick='initChannelTree();'>该频道下还没有TAG树，请点击这里创建TAG树。</a>";
          }
        document.getElementById("releaseTreeSpan").style.display="block";
     
     }
     else
     {
        document.getElementById("releaseTreeSpan").style.display="none";
        document.getElementById("treeDiv1").innerText="";
     }
     document.getElementById("releaseTree").href="/Tag/TagTreePosition.aspx?TreeId="+treeId+"&placeValuesBeforeTB_=savedValues&TB_iframe=true&height=500&width=770";
   }
  
   function LoadNodeContent(nodeId)
   {
         var param="NodeId="+ nodeId;
         ShowContentA("/controls/Tag/TagListForTree.ashx",param,document.getElementById("NodeContent"),null);
   }

    function initChannelTree()
    {
         var res=AjaxForTree.CreateTree(channelId).value;

         if(res!=-1)
         {
            treeId=res;
            treeInit();
         }
         else
         {
            document.getElementById("treeDiv1").innerHTML="树创建失败！";
         }
    }
   
    //global variable to allow console inspection of tree:
    var tree;
    var currentTreeNodeId;
    var oTextNodeMap= {}; 
    function treeInit() {
   
           tree =new YAHOO.widget.TreeView("treeDiv1");
          
            var myobj="{label:'所有',id:'1'}";
               myobj=eval('('+myobj+')');
            var rootNode=new YAHOO.widget.TextNode(myobj, tree.getRoot(),true);
            oTextNodeMap[rootNode.labelElId]=rootNode;
           
            buildChildNodeTree(rootNode,treeId);
           tree.subscribe("expand",function(node) {
          
               });

           tree.subscribe("collapse",function(node) {
       
               });


           // Trees with TextNodes will fire an event for when the label is clicked:
           tree.subscribe("labelClick",function(node) {
                 var nodeId=node.data.id;
                  document.getElementById('TagBtnList').style.display='';
                  document.getElementById('addTags').href='/Tag/SelectTreeTag.aspx?TreeNodeId='+nodeId+'&placeValuesBeforeTB_=savedValues&TB_iframe=true&height=500&width=770';
                  //document.getElementById('addTags').href='/PositionMore.aspx?placeValuesBeforeTB_=savedValues&TB_iframe=true&height=500&width=770';
                 LoadNodeContent(nodeId);
                 currentTreeNodeId=nodeId;
               });

        //alert(tree.getRoot());
        //The tree is not created in the DOM until this method is called:
        tree.draw();
 

    }
   
    function buildChildNodeTree( node )
    {
        var nodeId=node.data.id;
         //alert(nodeId);
        var ds_Normal=AjaxForTree.GetChildNode(nodeId,treeId).value;
        if(ds_Normal!=null&&typeof(ds_Normal)=="object"&& ds_Normal.Tables!=null)
        {
     
          for(var i=0;i<ds_Normal.Tables[0].Rows.length;i++)
          {
             var TreeNodeId=ds_Normal.Tables[0].Rows[i].TreeNodeId;
             var TreeNodeName=ds_Normal.Tables[0].Rows[i].TreeNodeName;

             var myobj="{label:'"+ TreeNodeName+"',id:'"+ TreeNodeId+"'}";
                 myobj=eval('('+myobj+')');
             var tmpNode=new YAHOO.widget.TextNode(myobj, node,true);
             oTextNodeMap[tmpNode.labelElId]=tmpNode;
             ds_child=AjaxForTree.GetChildNode(TreeNodeId,treeId).value;
             if(ds_child!=null&& ds_child.Tables!=null&& ds_child.Tables[0].Rows.length!=0)
             {
                //alert(ds_child.Tables[0].Rows.length);
                tmpNode.setDynamicLoad(loadDataForNode);
             } 
          }
         
        }
      
       
    
       
    }

    //Add an onDOMReady handler to build the tree when the document is ready
    //YAHOO.util.Event.onDOMReady(treeInit);

    function loadDataForNode(node, onCompleteCallback) {  

     buildChildNodeTree(node,treeId);
     onCompleteCallback();  
    }  
   
    /*
     The YAHOO.widget.TextNode instance whose "contextmenu"
     DOM event triggered the display of the
     ContextMenu instance.
*/

var oCurrentTextNode=null;


/*
     Adds a new TextNode as a child of the TextNode instance
     that was the target of the "contextmenu" event that
     triggered the display of the ContextMenu instance.
*/

function addNode() {

    var sLabel= window.prompt("请为新建立的节点输入名称:","");
    var rtn=CheckIsValid(sLabel);
    if (!rtn)
    {
      alert('您输入的内容中含有非法字符，这里只允许输入字母或数字！');
      return;
    }
    if (sLabel&& sLabel.length>0) {
            
       var nodeId=oCurrentTextNode.data.id;
       var res=AjaxForTree.AddTreeNode(nodeId,sLabel,treeId).value;
       //alert(res);
       treeInit();
      
    }

}


/*
     Edits the label of the TextNode that was the target of the
     "contextmenu" event that triggered the display of the
     ContextMenu instance.
*/

function editNodeLabel() {
    if (oCurrentTextNode.data.id==1)
    {
        alert('根节点不能编辑！');
        return;
    }
  
    var sLabel= window.prompt("请为当前的节点输入新的名称:", oCurrentTextNode.getLabelEl().innerHTML);
    var rtn=CheckIsValid(sLabel);
    if (!rtn)
    {
      alert('您输入的内容中含有非法字符，这里只允许输入字母或数字！');
      return;
    }
    if (sLabel&& sLabel.length>0) {
       
        var nodeId=oCurrentTextNode.data.id;
        var res=AjaxForTree.EditTreeNode(nodeId,sLabel).value;
        treeInit();
    }

}


/*
    Deletes the TextNode that was the target of the "contextmenu"
    event that triggered the display of the ContextMenu instance.
*/

function deleteNode() {

        var isTrue=window.confirm("您确认删除这个节点吗？");
        if (isTrue)
        {
            if (oCurrentTextNode.data.id==1)
            {
                alert('根节点不能删除！');
                return;
            }
            var nodeId=oCurrentTextNode.data.id;
            var res=AjaxForTree.DelTreeNode(nodeId).value;
            treeInit();
        }
       
}


/*
    "contextmenu" event handler for the element(s) that
    triggered the display of the ContextMenu instance - used
    to set a reference to the TextNode instance that triggered
    the display of the ContextMenu instance.
*/

function onTriggerContextMenu(p_oEvent) {

   
    function getTextNodeFromEventTarget(p_oTarget) {

        if (p_oTarget.tagName.toUpperCase()=="A"&&
                p_oTarget.className =="ygtvlabel") {

            return oTextNodeMap[p_oTarget.id];

        }
        else {

            if (p_oTarget.parentNode&&
                    p_oTarget.parentNode.nodeType ==1) {

                return getTextNodeFromEventTarget(p_oTarget.parentNode);
           
            }
       
        }
   
    }

     
    var oTextNode= getTextNodeFromEventTarget(this.contextEventTarget);
   
 
    if (oTextNode) {

        oCurrentTextNode = oTextNode;

    }
    else {
   
        // Cancel the display of the ContextMenu instance.
   
        this.cancel();
       
    }

}


    var oContextMenu=new YAHOO.widget.ContextMenu("mytreecontextmenu", {
                                                    trigger: "treeDiv1",
                                                    lazyload: true,
                                                    itemdata: [
                                                        { text: "增加子节点", onclick: { fn: addNode } },
                                                        { text: "编辑当前节点", onclick: { fn: editNodeLabel } },
                                                        { text: "删除当前节点", onclick: { fn: deleteNode } }
                                                    ] });

          oContextMenu.subscribe("triggerContextMenu", onTriggerContextMenu);   

    </script>