省市县三级联动（webFrom...DropdownList）

编辑页面

<html xmlns="http://www.w3.org/1999/xhtml">

<head runat="server">

<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>

    <title></title>

</head>

<body>

    <form id="form1" runat="server">

    <div>

    </div>

        <asp:DropDownList ID="DropDownList1" runat="server" Width="100px" AutoPostBack="True" Height="50px" OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged" style="margin-bottom: 0px" >

        </asp:DropDownList>

        <asp:DropDownList ID="DropDownList2" runat="server" Width="100px" AutoPostBack="True" Height="50px" OnSelectedIndexChanged="DropDownList2_SelectedIndexChanged">

        </asp:DropDownList>

        <asp:DropDownList ID="DropDownList3" runat="server" Width="100px" AutoPostBack="True" Height="50px">

        </asp:DropDownList>

    </form>

</body>

</html>

编辑cs

public partial class Test2 : System.Web.UI.Page

{

    public DataClassesDataContext context;

    protected void Page_Load(object sender, EventArgs e)

    {

        context = new DataClassesDataContext();

        if(!IsPostBack)

        {

            databind("");

            datashibind("");

            dataxianbind("");

        }

    }

    private void databind(string parentareacode)

    {

        var querydata = from q in context.ChinaStates

                    where q.ParentAreaCode == parentareacode

                    select q;

        DropDownList1.DataSource = querydata;//指定数据源

        //DropDownList1.Items.Insert(0,new ListItem("请选择单位"));

        DropDownList1.DataTextField = "AreaName";//界面上显示的是地名

        DropDownList1.DataValueField = "AreaCode";//存的是地区编号

        DropDownList1.DataBind();

    }

    private void datashibind(string parentareacode)

    {

        var querydata = from q in context.ChinaStates

                        where q.ParentAreaCode ==parentareacode

                        select q;

        DropDownList2.DataSource = querydata;

        DropDownList2.DataTextField = "AreaName";//界面上显示的是地名

        DropDownList2.DataValueField = "AreaCode";//存的是地区编号

        DropDownList2.DataBind();

    }

    private void dataxianbind(string parentareacode)

    {

        var querydata = context.ChinaStates.Where(r=>r.ParentAreaCode==parentareacode);

        DropDownList3.DataSource = querydata;

        DropDownList3.DataTextField = "AreaName";//界面上显示的是地名

        DropDownList3.DataValueField = "AreaCode";//存的是地区编号

        DropDownList3.DataBind();

    }

    protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)

    {

        string code = DropDownList1.SelectedValue.ToString();

        datashibind(code);

        if (DropDownList2.Items.Count > )

        {

            string s = DropDownList2.SelectedItem.Value.ToString();

            dataxianbind(s);

        }

        else

        {

            DropDownList3.Items.Clear();

        }

    }

    protected void DropDownList2_SelectedIndexChanged(object sender, EventArgs e)

    {

        string code = DropDownList2.SelectedValue.ToString();

        dataxianbind(code);

    }

}

巴特西

省市县三级联动（webFrom...DropdownList）

最新文章

热门文章