Telerik RadTreeView查寻值的方法

        var tree=$find("ctl00_ContentPlaceHolder1_UserPrivilege2_tvUsers");
                var txt=  document.getElementById("ctl00_ContentPlaceHolder1_UserPrivilege1_txtSearchUserName2");
1.                 var i;
                var j=0;
                var sourceNodes = tree.get_allNodes();

                for(i=0;i<sourceNodes.length;i++)
                {
                    var node = sourceNodes[i];
                   
                    if(node.get_text().toLowerCase() == txt.value.toLowerCase())
                     {  
                        node.select();
                        j++;
                     }                       
                }
                if(j==0)
                    alert("找不到对应的数据!");
                                tree.trackChanges();
                                tree.commitChanges();

2.      var node = tree.findNodeByText(txt.value);
            if (node !=null)
                   node.select();
                else
                   alert("找不到对应的数据!");
            tree.trackChanges();
            tree.commitChanges();