[原创]有相同父节点的一组子节点中只能选择一个，实现树中节点的单选功能！

原贴内容：
补充问一问题，在最底一层的子节点上面，我都加上了CheckBox，现在要求：
（1）有相同父节点的一组子节点中只能选择一个，选另一个时，原来选中的变为不选中。
（2）每一组（一组只有相同的父节点的）最底层的子节点，必须要选择一个。

  < script language = " javascript " >
function  CheckOne()
         {
           var  cIndex = TreeView2.clickedNodeIndex;
           var  tmp = cIndex.split( " . " );
           if  (tmp.length == 3 )   // 代表都是第3层节点
          {
             var  pNode = TreeView2.getTreeNode(cIndex);
             var  parentNode = pNode.getParent();
             var  NodeArray  = new  Array();
            NodeArray = parentNode.getChildren();
             for ( var  i = 0 ;i < NodeArray.length;i ++ )
            {
                 var  cNode = NodeArray[i];
                cNode.setAttribute('Checked',' false ');
                 if  (cNode.getAttribute( " Text " ) == pNode.getAttribute( " Text " ))
                {
                 cNode.setAttribute('Checked',' true ');
                }
                
            }
          }
         }
        
         </ script >

< body  MS_POSITIONING ="GridLayout" >
         < form  id ="Form1"  method ="post"  runat ="server" >
             < iewc:TreeView  id ="TreeView2"    style ="Z-INDEX: 101; LEFT: 264px; POSITION: absolute; TOP: 176px"                 runat ="server" >
                 < iewc:TreeNode  Text ="Node0"  Expanded ="True" >
                     < iewc:TreeNode  Text ="Node2"  Expanded ="True" >
                         < iewc:TreeNode  Checked ="True"  CheckBox ="True"  Text ="Node4" ></ iewc:TreeNode >
                         < iewc:TreeNode  CheckBox ="True"  Text ="Node5" ></ iewc:TreeNode >
                         < iewc:TreeNode  CheckBox ="True"  Text ="Node6" ></ iewc:TreeNode >
                         < iewc:TreeNode  CheckBox ="True"  Text ="Node7" ></ iewc:TreeNode >
                     </ iewc:TreeNode >
                     < iewc:TreeNode  Text ="Node3" ></ iewc:TreeNode >
                 </ iewc:TreeNode >
                 < iewc:TreeNode  Text ="Node1" ></ iewc:TreeNode >
             </ iewc:TreeView >
               </ form >
     </ body >

最后在加上一个后台代码：

  Private   Sub Page_Load() Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
              TreeView2.Attributes.Add("oncheck", "javascript:CheckOne();")
    End Sub