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  • 局部刷新&二级联动下拉菜单

    前台:

     <td align="left">
           <asp:UpdatePanel ID="UpdatePanel4" runat="server">
            <ContentTemplate>
                   <asp:DropDownList ID="ddlFanwei" runat="server" OnSelectedIndexChanged="ddlFanwei_SelectedIndexChanged"
                            AutoPostBack="true">
                   </asp:DropDownList>
                             至
                   <asp:DropDownList ID="ddlLevel" runat="server">
                   </asp:DropDownList>
            </ContentTemplate>
          </asp:UpdatePanel>
      </td>

    后台:

     protected void ddlLevel_Bind()
        {
            string SqlString = "select * from Event_level ";
            DataTable dt = DataAccess.SelectBySql("SOC2.ConnectionString.sql", SqlString);
            DataRow dr = dt.NewRow();
            ddlLevel.DataSource = dt;
            ddlLevel.DataValueField = "code";
            ddlLevel.DataTextField = "Level";
            ddlFanwei.DataSource = dt;
            ddlFanwei.DataValueField = "code";
            ddlFanwei.DataTextField = "Level";
            ddlFanwei.DataBind();
            ddlLevel.DataBind();
        }

        protected void ddlFanwei_SelectedIndexChanged(object sender, EventArgs e)
        {
            string sql = "select * from Event_level where code > =  '" + ddlFanwei.SelectedValue +"'";
            DataTable dt2 = DataAccess.SelectBySql("SOC2.ConnectionString.sql",sql);
            DataRow dr2 = dt2.NewRow();
            ddlLevel.DataSource = dt2;
            ddlLevel.DataValueField = "code";
            ddlLevel.DataTextField = "Level";
            ddlLevel.DataBind();
        }

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  • 原文地址:https://www.cnblogs.com/peggy89321/p/2598797.html
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