<asp:TreeView ID="treeViewDapartment" runat="server" SelectedNodeStyle-BackColor="GrayText" onclick="javascript:NodeCheck();" 
     Font-Size="13px" ShowCheckBoxes="All" ShowLines="true" AutoGenerateDataBindings="false" ShowExpandCollapse="true" >
</asp:TreeView>

<script language="javascript" type="text/javascript">
   //節(jié)點(diǎn)父節(jié)點(diǎn)選中子節(jié)點(diǎn)全選
   function NodeCheck() {  
      var o = window.event.srcElement;
      if (o.tagName == "INPUT" && o.type == "checkbox") //點(diǎn)擊treeview的checkbox是觸發(fā) 
      {
        var d = o.id; //獲得當(dāng)前checkbox的id; 
        var e = d.replace("CheckBox", "Nodes"); //通過(guò)查看腳本信息,獲得包含所有子節(jié)點(diǎn)div的id 
        var div = window.document.getElementById(e); //獲得div對(duì)象 
        if (div != null) //如果不為空則表示,存在自節(jié)點(diǎn) 
        {
          var check = div.getElementsByTagName("INPUT"); //獲得div中所有的已input開(kāi)始的標(biāo)記 
          for (i = 0; i < check.length; i++) {
            if (check[i].type == "checkbox") //如果是checkbox 
            {
              check[i].checked = o.checked; //字節(jié)點(diǎn)的狀態(tài)和父節(jié)點(diǎn)的狀態(tài)相同,即達(dá)到全選 
            }
          }
        }
        else //點(diǎn)子節(jié)點(diǎn)的時(shí)候,使父節(jié)點(diǎn)的狀態(tài)改變,即不為全選
        {
          var divid = o.parentElement.parentElement.parentElement.parentElement.parentElement; //子節(jié)點(diǎn)所在的div   
          var id = divid.id.replace("Nodes", "CheckBox"); //獲得根節(jié)點(diǎn)的id 

          var checkbox = divid.getElementsByTagName("INPUT"); //獲取所有子節(jié)點(diǎn)數(shù)
          var s = 0;
          for (i = 0; i < checkbox.length; i++) {
            if (checkbox[i].checked) //判斷有多少子節(jié)點(diǎn)被選中 
            {
              s++;
            }
          }
          if (s == checkbox.length) //如果全部選中 或者 選擇的是另外一個(gè)根節(jié)點(diǎn)的子節(jié)點(diǎn) ， 
          {                //  則開(kāi)始的根節(jié)點(diǎn)的狀態(tài)仍然為選中狀態(tài) 
            window.document.getElementById(id).checked = true;
          }
          else {                //否則為沒(méi)選中狀態(tài) 
            window.document.getElementById(id).checked = false;
          }
        }

      }
  }
</script>

protected void Page_Load(object sender, EventArgs e)
{  
    this.treeViewDapartment.Attributes.Add("onclick", "NodeCheck();"); 

}