XmlHttp实现无刷新三联动下拉框


1.html代码

<HTML>
    <HEAD>
        <title>XmlHttp实现无刷新三联动下拉框</title>
        <meta name="GENERATOR" Content="Microsoft Visual Studio .NET 7.1">
        <meta name="CODE_LANGUAGE" Content="C#">
        <meta name="vs_defaultClientScript" content="JavaScript">
        <meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5">
    </HEAD>
    <body MS_POSITIONING="GridLayout">
        <form id="Form1" method="post" runat="server">
            <INPUT style="Z-INDEX: 102; LEFT: 448px; WIDTH: 56px; POSITION: absolute; TOP: 80px; HEIGHT: 24px"
                onclick="getData();" type="button" value="保存" id="Button1" name="Button1" runat="server">
            <asp:TextBox id="TextBox1" style="Z-INDEX: 101; LEFT: 16px; POSITION: absolute; TOP: 80px" runat="server"
                Width="424px"></asp:TextBox>
            <asp:DropDownList id="DropDownList2" runat="server" style="Z-INDEX: 103; LEFT: 176px; POSITION: absolute; TOP: 120px"></asp:DropDownList>
            <asp:DropDownList id="DropDownList1" runat="server" style="Z-INDEX: 104; LEFT: 16px; POSITION: absolute; TOP: 120px"></asp:DropDownList>
            <asp:DropDownList id="DropDownList3" runat="server" style="Z-INDEX: 105; LEFT: 296px; POSITION: absolute; TOP: 120px"></asp:DropDownList><INPUT style="Z-INDEX: 106; LEFT: 8px; WIDTH: 160px; POSITION: absolute; TOP: 176px; HEIGHT: 22px"
                type="hidden" size="21" id="hidprovince" runat="server"><INPUT style="Z-INDEX: 107; LEFT: 184px; POSITION: absolute; TOP: 176px" type="hidden"
                id="hidcity" runat="server"><INPUT style="Z-INDEX: 108; LEFT: 360px; POSITION: absolute; TOP: 176px" type="hidden"
                id="hidarea" runat="server">
            <SCRIPT LANGUAGE="JavaScript">
            <!--
                //以XML求取DropDownList2的数据
                function XmlPost2(obj)
                {
                  var svalue = obj.value;
                  var webFileUrl = "?povinceid=" + svalue;
                  var result = "";
                  var xmlHttp = new ActiveXObject("MSXML2.XMLHTTP");
                  xmlHttp.open("POST", webFileUrl, false);
                  xmlHttp.send("");
                  result = xmlHttp.responseText;
                  
                  if(result != "")
                  {
                    document.all("DropDownList2").length=0;
                    var piArray = result.split(",");
                    for(var i=0;i<piArray.length;i++)
                    {
                      var ary1 = piArray[i].toString().split("|");
                      document.all("DropDownList2").options.add(new Option(ary1[1].toString(),ary1[0].toString()));
                    }
                  }
                  else
                  {
                    alert(result);
                  }
                }
                //以XML求取DropDownList3的数据
                function XmlPost3(obj)
                {
                  var svalue = obj.value;
                  var webFileUrl = "?cityid=" + svalue;
                  var result = "";
                  var xmlHttp = new ActiveXObject("MSXML2.XMLHTTP");
                  xmlHttp.open("POST", webFileUrl, false);
                  xmlHttp.send("");
                  result = xmlHttp.responseText;
                  
                  if(result != "")
                  {
                    document.all("DropDownList3").length=0;
                    var piArray = result.split(",");
                    for(var i=0;i<piArray.length;i++)
                    {
                      var ary1 = piArray[i].toString().split("|");
                      document.all("DropDownList3").options.add(new Option(ary1[1].toString(),ary1[0].toString()));
                    }
                  }
                  else
                  {
                    alert(result);
                  }
                }
                function getData()
                {
                    var province=document.getElementById("DropDownList1");
                    var pindex = province.selectedIndex;
                    var pValue = province.options[pindex].value;
                    var pText  = province.options[pindex].text;
                    
                    var city=document.getElementById("DropDownList2");
                    var cindex = city.selectedIndex;
                    var cValue = city.options[cindex].value;
                    var cText  = city.options[cindex].text;
                    
                    var area=document.getElementById("DropDownList3");
                    var aindex = area.selectedIndex;
                    var aValue = area.options[aindex].value;
                    var aText  = area.options[aindex].text;
                    
                    var txt=document.getElementById("TextBox1");                                

                    document.getElementById("<%=TextBox1.ClientID%>").innerText="省:"+pValue+"|"+pText+"市:"+cValue+"|"+cText+"区:"+aValue+"|"+aText;
                    document.Form1.hidprovince.value=pValue;
                    document.Form1.hidcity.value=cValue;
                    document.Form1.hidarea.value=aValue;
                }
            //-->
            </SCRIPT>
        </form>
    </body>
</HTML>

2.cs代码

public class WebForm1 : System.Web.UI.Page
    {
        protected System.Web.UI.WebControls.DropDownList DropDownList1;
        protected System.Web.UI.WebControls.DropDownList DropDownList2;
        protected System.Web.UI.WebControls.DropDownList DropDownList3;
        protected System.Web.UI.WebControls.TextBox TextBox1;
    
        public static string ConnectionString=System.Configuration .ConfigurationSettings .AppSettings["ConnectionString"];
    
        GetDataSet#region GetDataSet
        public static DataSet GetDataSet(string sql)
        {
            SqlDataAdapter    sda =new SqlDataAdapter(sql,ConnectionString);
            DataSet ds=new DataSet();
            sda.Fill(ds);
            return ds;
        }
        #endregion

        property#region property
        private string provinceid
        {
            get
            {
                if(ViewState["provinceid"]!=null && ViewState["provinceid"].ToString()!="")
                {
                    return ViewState["provinceid"].ToString();
                }
                else
                {
                    if(Request["provinceid"]!=null && Request["provinceid"].ToString()!="")
                    {
                        return Request["provinceid"];
                    }
                    else
                    {
                        return "";
                    }
                }
            }
            set
            {
                ViewState["provinceid"]=value;
            }
        }
        private string cityid
        {
            get
            {
                if(ViewState["cityid"]!=null && ViewState["cityid"].ToString()!="")
                {
                    return ViewState["cityid"].ToString();
                }
                else
                {
                    if(Request["cityid"]!=null && Request["cityid"].ToString()!="")
                    {
                        return Request["cityid"];
                    }
                    else
                    {
                        return "";
                    }
                }
            }
            set
            {
                ViewState["cityid"]=value;
            }
        }
        #endregion

        Page_Load#region Page_Load
        private void Page_Load(object sender, System.EventArgs e)
        {
            if(!this.IsPostBack)
          {
            this.down1_bind();
                this.DropDownList1.Attributes.Add("onchange","XmlPost2(this);");
                this.DropDownList2.Attributes.Add("onchange","XmlPost3(this);");
          }
          if(provinceid != "")
          {
            this.down2_bind(provinceid);
          }
            if(cityid != "")
          {
            this.down3_bind(cityid);
          }
        }
        
        #endregion

        down2_bind#region down2_bind
        private void down2_bind(string id)
        {
          string mystr = "";
          string sql = "select cityID,city from city where father = '" + id + "'";
          DataSet ds = GetDataSet(sql);

          if(ds.Tables[0].Rows.Count != 0)
          {
            for(int i=0;i<ds.Tables[0].Rows.Count;i++)
            {
              mystr += "," + ds.Tables[0].Rows[i][0].ToString() + "|" + ds.Tables[0].Rows[i][1].ToString();
            }
            mystr = mystr.Substring(1);
          }
          this.Response.Write(mystr);
          this.Response.End();
        }
        #endregion

        down3_bind#region down3_bind
        private void down3_bind(string id)
        {
          string mystr = "";
          string sql = "select areaID,area from area where father = '" + id + "'";
          DataSet ds = GetDataSet(sql);

          if(ds.Tables[0].Rows.Count != 0)
          {
            for(int i=0;i<ds.Tables[0].Rows.Count;i++)
            {
              mystr += "," + ds.Tables[0].Rows[i][0].ToString() + "|" + ds.Tables[0].Rows[i][1].ToString();
            }
            mystr = mystr.Substring(1);
          }
          this.Response.Write(mystr);
          this.Response.End();
        }

        #endregion
        
        down1_bind#region down1_bind
        private void down1_bind()
        {
          string sql = "select provinceID,province from province";
          DataSet ds = GetDataSet(sql);
          this.DropDownList1.DataSource = ds;
          this.DropDownList1.DataValueField = "provinceID";
          this.DropDownList1.DataTextField = "province";
          this.DropDownList1.DataBind();          
        }

        #endregion

        Web Form Designer generated code#region Web Form Designer generated code
        override protected void OnInit(EventArgs e)
        {
            //
            // CODEGEN: This call is required by the ASP.NET Web Form Designer.
            //
            InitializeComponent();
            base.OnInit(e);
        }

        /**//// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {    
            this.Load += new System.EventHandler(this.Page_Load);

        }
        #endregion
    }

3.数据库area1.rar
4.Ajax实现无刷新三联动下拉框

5.源代码下载XmlHttpselect.rar


posted on 2007-06-20 13:33 chenguo 阅读(279) 评论(0)  编辑  收藏 所属分类: AJAX Dev


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