我为了往服务器传值用autopostback，我已经把dropdownlist放到updatapanel里面了但是页面还是刷新为什么代码如下

a2230030100 2012-05-25 12:06:18

前台大概这样的



 <%@ Page Language="C#" AutoEventWireup="true" CodeBehind="zc.aspx.cs" Inherits="DtCms.Web.Aspx.zc" EnableEventValidation="false" %>



<%@ Register TagPrefix="DtContorl" Namespace="DtCms.Web.UI" Assembly="DtCms.Web.UI" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

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

<head runat="server">

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

<title><%= SiteConfig.WebName %></title>

<!-- ===== css ===== -->



</head>

<body  onLoad="init()">

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

    <asp:ScriptManager ID="ScriptManager1" runat="server">

    </asp:ScriptManager>

<div>

<td width="200px"></td><td width="130px" align="right">籍贯：</td><td width="130px">

            <asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional">

            <ContentTemplate>

            <asp:DropDownList ID="ddlProvince" runat="server" 

                    onselectedindexchanged="ddlProvince_SelectedIndexChanged1" AutoPostBack="true">

            </asp:DropDownList>

            <asp:DropDownList ID="ddlCity" runat="server">

            </asp:DropDownList>

            </ContentTemplate>

            </asp:UpdatePanel>

        </td>

</div>



    </form>

</body>

</html>

后台大概这样的



 protected void ddlProvince_SelectedIndexChanged1(object sender, EventArgs e)

        {

            ddlCity.DataSource = bll.GetCity(ddlProvince.SelectedValue.ToString()).DefaultView;//根据页面的返回值传递信息绑定城市信息

            ddlCity.DataTextField = bll.GetCity(ddlProvince.SelectedValue.ToString()).Columns[0].ToString();

            ddlCity.DataBind();

        }

...全文

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shen_zhijin 2012-08-02

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<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<p>

<asp:Label ID="lbldepartment" runat="server" Text="部门："></asp:Label>
<asp:DropDownList ID="ddldepartment" runat="server" AutoPostBack="True"
onselectedindexchanged="ddldepartment_SelectedIndexChanged">
</asp:DropDownList>
<p>

<asp:Label ID="lblsubdepartment" runat="server" Text="科室："></asp:Label>
<asp:DropDownList ID="ddlsubdepartment" runat="server" AutoPostBack="True"
onselectedindexchanged="ddlsubdepartment_SelectedIndexChanged">
</asp:DropDownList>
</p>
<p>

<asp:Label ID="lblposition" runat="server" Text="职位："></asp:Label>
<asp:DropDownList ID="ddlposition" runat="server"
onselectedindexchanged="ddlposition_SelectedIndexChanged">
</asp:DropDownList>
</p>
</ContentTemplate>
</asp:UpdatePanel>
我用UpdatePane做了的autopostback=true 时，页面无刷新，是没问题的。
注意点：<form id="form1" runat="server">
<asp:ScriptManager ID="ScriptManger1" runat="server">
</asp:ScriptManager>
在表单form的下面要加上这两句话，不然会有错误哦

紫魂一号 2012-05-25

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也许楼上的正确

WHI 2012-05-25

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updatepanel 要指定控件及控件的事件
<triggers>标签好像是这个功能

WHI 2012-05-25

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 <asp:ScriptManager runat="server">

        </asp:ScriptManager>

        <asp:UpdatePanel runat="server">

            <ContentTemplate>

                <asp:DropDownList ID="ddlTest" runat="server" AutoPostBack="true" OnSelectedIndexChanged="ddlTest_SelectedIndexChanged">

                    <asp:ListItem Text="aaaa" Value="1"></asp:ListItem>

                    <asp:ListItem Text="bbb" Value="2"></asp:ListItem>

                    <asp:ListItem Text="ccc" Value="3"></asp:ListItem>

                    <asp:ListItem Text="ddd" Value="4"></asp:ListItem>

                </asp:DropDownList>

            </ContentTemplate>

            <Triggers>                

                <asp:AsyncPostBackTrigger ControlID="ddlTest" 

                    EventName="SelectedIndexChanged" />                    

            </Triggers>

        </asp:UpdatePanel>

licai1210 2012-05-25

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[Quote=引用 6 楼的回复:]
引用 5 楼的回复:

C# code

<form id="form1" runat="server">
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<div>
<table>
<tr>
<td width="13……

和我做的有什么不同我哪里弄错了能给说下嘛……
[/Quote]
和你的没什么不同，就把标签补全了，然后你看看你的绑定数据有没有错误。其他没什么

a2230030100 2012-05-25

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[Quote=引用 5 楼的回复:]

C# code

<form id="form1" runat="server">
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<div>
<table>
<tr>
<td width="13……
[/Quote]
和我做的有什么不同我哪里弄错了能给说下嘛？

licai1210 2012-05-25

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

    <asp:ScriptManager ID="ScriptManager1" runat="server">

    </asp:ScriptManager>

    <div>

        <table>

            <tr>

                <td width="130px" align="right">

                    籍贯：

                </td>

                <td width="130px">

                    <asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional">

                        <ContentTemplate>

                            <asp:DropDownList ID="ddlProvince" runat="server" OnSelectedIndexChanged="ddlProvince_SelectedIndexChanged1"

                                AutoPostBack="true">

                                <asp:ListItem Text="1" Value="1"></asp:ListItem>

                                <asp:ListItem Text="2" Value="2"></asp:ListItem>

                            </asp:DropDownList>

                            <asp:DropDownList ID="ddlCity" runat="server">

                            </asp:DropDownList>

                        </ContentTemplate>

                    </asp:UpdatePanel>

                </td>

            </tr>

        </table>

    </div>

    </form>



    protected void ddlProvince_SelectedIndexChanged1(object sender, EventArgs e)

    {

        //ddlCity.DataSource = bll.GetCity(ddlProvince.SelectedValue.ToString()).DefaultView;//根据页面的返回值传递信息绑定城市信息

        //ddlCity.DataTextField = bll.GetCity(ddlProvince.SelectedValue.ToString()).Columns[0].ToString();

        //ddlCity.DataBind();

        ddlCity.Items.Add(new ListItem("3", "3"));

    }