【原创】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

  <div class="yui-skin-sam">
                                        <div id="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>