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再谈N个ASP.net DropDownList无刷新联动菜单

来源:互联摘选 日期:2008-05-11 09:23

     再谈 N 个 ASP.net DropDownList 无刷新联动菜单,牺牲N-1个ASPX来实现自动更新机制,避免刷新的闪动!!

以下代码绝对可以使用,也可以实现多级菜单。。。。

  <script language="javascript">
   function load(state)
   {
    var drp2 = document.getElementById("DropDownList2");
    for(var i=0;i<=drp2.options.length-1;i++)
    {
     drp2.remove(i);
    }
    var oHttpReq = new ActiveXObject("MSXML2.XMLHTTP");    //发送请求
    var oDoc = new ActiveXObject("MSXML2.DOMDocument");    //响应结果
    var state=document.getElementById("DropDownList1").value;
    oHttpReq.open("post","webform2.aspx?state="+state, false);
    oHttpReq.send("");
    result = oHttpReq.responseText;
    oDoc.loadXML(result); 
    
   // items = oDoc.selectNodes("//CITY/Table");
       items = oDoc.selectNodes("//address/Table");
     for (var item = items.nextNode();item;item = items.nextNode())
     { 
      var city = item.selectSingleNode("//address").nodeTypedValue;
      var newOption = document.createElement("OPTION"); 
      newOption.text = city; 
      newOption.value = city; 
      drp2.options.add(newOption); 
      } 
   }
  </script>

============================

webform1.aspx

private void Page_Load(object sender, System.EventArgs e)
  {
   // 在此处放置用户代码以初始化页面
   if(!IsPostBack)
   {
    SqlConnection con = new SqlConnection("packet size=4096;user id=sa;data source=SERVER;persist security info=False;initial catalog=pubs");
    SqlDataAdapter da = new SqlDataAdapter("select state from authors group by state",con);
    DataSet ds = new DataSet("State");
    da.Fill(ds);
    this.DropDownList1.DataSource = ds.Tables[0];
    this.DropDownList1.DataTextField = "state";
    this.DropDownList1.DataValueField = "state"; 
    this.DropDownList1.DataBind();  
    this.DropDownList1.Attributes.Add("onchange","load()");  
    //DropDownList1.
   }
  
  }

webform2.aspx

 private void Page_Load(object sender, System.EventArgs e)
  {
   // 在此处放置用户代码以初始化页面
   if(this.Request["state"]!=null)
   {  
    string state = this.Request["state"].ToString();  
    SqlConnection con = new SqlConnection("packet size=4096;user id=sa;data source=SERVER;persist security info=False;initial catalog=pubs");
    SqlDataAdapter da = new SqlDataAdapter("select address from authors where state = '"+state+"'",con);  
    DataSet ds = new DataSet("address");  
    da.Fill(ds);  
    XmlTextWriter writer = new XmlTextWriter(Response.OutputStream, Response.ContentEncoding);  
    writer.Formatting = Formatting.Indented;  
    writer.Indentation = 4;  
    writer.IndentChar = ' ';  
    ds.WriteXml(writer);  
    writer.Flush();  
    Response.End();  
    writer.Close();  
   }
  }

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