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ASP.NET Web Form服务器控件三级联动

2024-10-07 01:04:39   214人阅读

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<form id="form1" runat="server">         <asp:ScriptManager ID="ScriptManager1" runat="server">        </asp:ScriptManager><asp:UpdatePanel ID="UpdatePanel1" runat="server" style="display:inline-block">                    <ContentTemplate>                        <asp:DropDownList  ID="ddltype1" runat="server" OnSelectedIndexChanged="ddltype1_SelectedIndexChanged"                            AutoPostBack="true">                        </asp:DropDownList>                        &nbsp;                        <asp:DropDownList ID="ddltype2"  runat="server" Visible="false" OnSelectedIndexChanged="ddltype2_SelectedIndexChanged"                            AutoPostBack="true">                        </asp:DropDownList>                        <asp:DropDownList ID="ddltype3"  runat="server" Visible="false">                        </asp:DropDownList>                    </ContentTemplate>                </asp:UpdatePanel>
三级联动页面代码

 

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         protected void ddltype1_SelectedIndexChanged(object sender, EventArgs e)        {            string ChannelID = ddltype1.SelectedValue;            if (ChannelID == "")            {                ddltype2.Visible = false;                return;            }            Binder(Convert.ToInt32(ChannelID), ddltype2);        }        protected void ddltype2_SelectedIndexChanged(object sender, EventArgs e)        {            string ChannelID = ddltype2.SelectedValue;            if (ChannelID == "")            {                ddltype3.Visible = false;                return;            }            Binder(Convert.ToInt32(ChannelID), ddltype3);        }        private void Binder(int ChannelID, DropDownList ddl)        {            if (ddl.Items.Count > 0)            {                ddl.Items.Clear();            }            ddl.DataTextField = "User_Group_Name";            ddl.DataValueField = "User_Group_Id";            List<Community.Model.USER_GROUP> lnc = Community.BLL.BUSER_GROUPExtBLL.GetGROUP(ChannelID);            if (lnc.Count > 0)            {                ddl.Visible = true;                ddl.DataSource = lnc;                ddl.DataBind();                ddl.Items.Insert(0, new ListItem("---请选择----", ""));            }            else            {                ddl.Visible = false;            }        }
三级联动后台SelectedIndexChanged事件

 

 

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            string type1 = ddltype1.SelectedValue;            string type2 = ddltype2.SelectedValue;            string type3 = ddltype3.SelectedValue;            if (type1 != "" && type2 != "" && type3 != "")            {                channelid = Convert.ToInt32(type3);            }            else if (type1 != "" && type2 != "" && type3 == "")            {                channelid = Convert.ToInt32(type2);            }            else if (type1 != "" && type2 == "" && type3 == "")            {                channelid = Convert.ToInt32(type1);            }            else            {                channelid = 0;            }
三级联动后台接受值的代码

 

ASP.NET Web Form服务器控件三级联动


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