此表单工作正常，但每当我选择下拉框时它会滚动，它会滚动到顶部。
<asp:UpdatePanel ID="updGridViewSMS" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<label><b>Search By Date Range</b></label>
<asp:Label ID="lblDateFrom" runat="server" Text="From"></asp:Label>
<asp:TextBox ID="txtFromDate" runat="server" ></asp:TextBox>
<asp:CalendarExtender ID="CalendarExtenderFromDate" Format="dd/MMM/yyyy" TargetControlID="txtFromDate" runat="server">
</asp:CalendarExtender>
<asp:RequiredFieldValidator ID="RequiredFieldValidator9" runat="server"
ControlToValidate="txtFromDate" Display="None" ErrorMessage=""
ForeColor="Red" >
</asp:RequiredFieldValidator>
<asp:Label ID="lblDateTo" runat="server" Text="To"></asp:Label>
<asp:TextBox ID="txtToDate" runat="server"></asp:TextBox>
<asp:CalendarExtender ID="CalendarExtenderToDate" Format="dd/MMM/yyyy" TargetControlID="txtToDate" runat="server">
</asp:CalendarExtender>
<asp:RequiredFieldValidator ID="RequiredFieldValidator10" runat="server"
ControlToValidate="txtToDate" Display="None" ErrorMessage=""
ForeColor="Red" >
</asp:RequiredFieldValidator>
<asp:Button ID="btnSearchByDate" CssClass="btn btn-success" runat="server" Text="Search"
ClientIDMode="Static" OnClick="btnSearchByDate_Click" />
<%--<asp:Button ID="btnEdit" CssClass="btn btn-success" runat="server" Text="Edit"
ClientIDMode="Static" OnClick="btnEdit_Click" />--%>
<asp:ValidationSummary
HeaderText="Requires Date Range:"
DisplayMode="SingleParagraph"
EnableClientScript="true"
ForeColor="Red"
runat="server" ID="ValidationSummary1"/>
<label runat="server" id="lblSelectionMessage" style="color:navy; font-size:12px; font-style:italic" visible="false">
</label>
<asp:GridView ID="GridViewSmsComplaints" AllowPaging="True" PageSize="5" runat="server" AutoGenerateColumns="False" Width="1085px" OnRowDataBound="GridViewSmsComplaints_RowDataBound" OnPageIndexChanging="GridViewSmsComplaints_PageIndexChanging" CellPadding="4" Height="417px" ForeColor="#333333" GridLines="None" >
<FooterStyle BackColor="#990000" ForeColor="White" Font-Bold="True" />
<HeaderStyle BackColor="#990000" Font-Bold="True" ForeColor="White" />
<PagerStyle BackColor="#FFCC66" ForeColor="#333333" HorizontalAlign="Center" />
<PagerTemplate>
<table>
<tr>
<td>
<asp:LinkButton ID="lnkFirstPage" CommandName="Page" CommandArgument="First" runat="server">First</asp:LinkButton>
</td>
<td>
<asp:LinkButton ID="lnkNextPage" CommandName="Page" CommandArgument="Next" runat="server">Next</asp:LinkButton>
</td>
<td>
<asp:LinkButton ID="lnkPrevPage" CommandName="Page" CommandArgument="Prev" runat="server">Previous</asp:LinkButton>
</td>
<td>
<asp:LinkButton ID="lnkLastPage" CommandName="Page" CommandArgument="Last" runat="server">Last</asp:LinkButton>
</td>
</tr>
</table>
</PagerTemplate>
<AlternatingRowStyle BackColor="White" />
<Columns>
<asp:BoundField HeaderText="Sms ID" DataField="ID" />
<asp:BoundField HeaderText="Recieving Date" DataField="RecievingDate" />
<%--<asp:BoundField HeaderText="ToMobileNo" DataField="ToMobileNo" /> --%>
<asp:BoundField HeaderText="Complainant Mob No." DataField="FromMobileNo" />
<asp:BoundField HeaderText="Complaint" DataField="Message" >
<ItemStyle Wrap="True" />
</asp:BoundField>
<asp:TemplateField HeaderText="Complete/InComplete">
<ItemTemplate>
<%--<asp:CheckBox ID="ckboxIsComplaint" runat="server" />--%>
<asp:DropDownList ID="ddlIsComplaint" runat="server" AutoPostBack="true" OnSelectedIndexChanged="ddlIsComplaint_SelectedIndexChanged">
<asp:ListItem Text="-Select-" Value="-1"></asp:ListItem>
<asp:ListItem Text="InComplete" Value="0"></asp:ListItem>
<asp:ListItem Text="Complete" Value="1"></asp:ListItem>
<asp:ListItem Text="Inappropriate" Value="-3"></asp:ListItem>
</asp:DropDownList>
</ItemTemplate>
</asp:TemplateField>
</Columns>
<RowStyle ForeColor="#333333" BackColor="#FFFBD6" />
<SelectedRowStyle BackColor="#FFCC66" Font-Bold="True" ForeColor="Navy" />
<SortedAscendingCellStyle BackColor="#FDF5AC" />
<SortedAscendingHeaderStyle BackColor="#4D0000" />
<SortedDescendingCellStyle BackColor="#FCF6C0" />
<SortedDescendingHeaderStyle BackColor="#820000" />
</asp:GridView>
<br />
<asp:Panel ID="pnlBoxesDropDowns" runat="server">
<label>Complainant</label>
<asp:TextBox ID="txtComplainant" runat="server" ></asp:TextBox>
<asp:RequiredFieldValidator ID="ReqFieldValdiatorComplainant" runat="server" ControlToValidate="txtComplainant" ErrorMessage="Complainant is Required" ForeColor="Red" SetFocusOnError="True" ValidationGroup="Complaints">Complainant is Required
</asp:RequiredFieldValidator>
<label>Relevant Region</label>
<asp:DropDownList ID="ddlRegions" runat="server" CssClass="DropDown_Width" Width="147px" OnSelectedIndexChanged="ddlRegions_SelectedIndexChanged" AppendDataBoundItems="True" AutoPostBack="true" >
<asp:ListItem Value="-1" Selected="True">-Select-</asp:ListItem>
</asp:DropDownList>
<asp:RequiredFieldValidator ID="ReqFieldValidatorRegions" runat="server"
ControlToValidate="ddlRegions" ErrorMessage="Region is Required" InitialValue="-1"
ForeColor="Red" ValidationGroup="Complaints">Region is Required</asp:RequiredFieldValidator>
<asp:Label ID="lblRelevantDistrict" runat="server">District</asp:Label>
<asp:DropDownList ID="ddlDistricts" runat="server" CssClass="DropDown_Width" Width="127px" OnSelectedIndexChanged="ddlDistricts_SelectedIndexChanged" AutoPostBack="true">
</asp:DropDownList>
<asp:RequiredFieldValidator ID="ReqFieldValidatorDistricts" runat="server"
ControlToValidate="ddlDistricts" ErrorMessage="Region is Required" InitialValue="-1"
ForeColor="Red" ValidationGroup="Complaints">District is Required</asp:RequiredFieldValidator>
<label>Relevant P.Station</label>
<asp:DropDownList ID="ddlPoliceStations" AutoPostBack="true" runat="server" Width="147px" CssClass="DropDown_Width" OnSelectedIndexChanged="ddlPoliceStations_SelectedIndexChanged">
</asp:DropDownList>
<asp:RequiredFieldValidator ID="ReqFieldValidatorPoliceStations" runat="server"
ControlToValidate="ddlPoliceStations" ErrorMessage="Police Station is Required" InitialValue="-1"
ForeColor="Red" ValidationGroup="Complaints">Police Station is Required</asp:RequiredFieldValidator>
<asp:label ID="lblPriority" runat="server">Priority</asp:label>
<asp:DropDownList ID="ddlPriority" runat="server" Width="127px">
<asp:ListItem Text="Top" Value="1"></asp:ListItem>
<asp:ListItem Text="Normal" Value="2"></asp:ListItem>
</asp:DropDownList>
</asp:Panel>
<br />
<br />
<asp:Timer runat="server" Enabled="false" Interval="240000" ID="RefreshSmsComplaints" OnTick="RefreshSmsComplaints_Tick" />
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="RefreshSmsComplaints" EventName="Tick" />
</Triggers>
</asp:UpdatePanel>
<asp:Button ID="btnDone" ValidationGroup="Complaints" runat="server" CssClass="btn btn-success"
OnClick="btnDone_Click" Text="Done" />
代码隐藏：
protected void ddlRegions_SelectedIndexChanged(object sender, EventArgs e)
{
//Loads Districts Drop Down List When Relevant Region is Clicked
ddlDistricts.Visible = true;
lblRelevantDistrict.Visible = true;
GridViewSmsComplaints.Visible = true;
try
{
if (ddlDistricts.SelectedValue == "0")
{
ddlDistricts.SelectedValue = "-1";
}
else
{
ddlDistricts.DataTextField = "Name";
ddlDistricts.DataValueField = "DistrictID";
ddlDistricts.DataSource = mngRecievedMsg.FillDropDown_Districts(Convert.ToInt16(ddlRegions.SelectedValue));
ddlDistricts.DataBind();
ListItem list = new ListItem("-Select-", "-1");
ddlDistricts.Items.Insert(0, list);
}
}
catch (Exception)
{
}
}
protected void ddlDistricts_SelectedIndexChanged(object sender, EventArgs e)
{
//Loads police Stations Drop Down List When Relevant Region is Clicked
updGridViewSMS.Visible = true;
try
{
if (ddlPoliceStations.SelectedValue == "0")
{
ddlPoliceStations.SelectedValue = "-1";
}
else
{
ddlPoliceStations.DataTextField = "Name";
ddlPoliceStations.DataValueField = "ID";
ddlPoliceStations.DataSource = mngRecievedMsg.GetHomePoliceStation(Convert.ToInt16(ddlDistricts.SelectedValue));
ddlPoliceStations.DataBind();
ListItem list_2 = new ListItem("-Select-", "-1");
ddlPoliceStations.Items.Insert(0, list_2);
}
}
catch (Exception)
{
}
}
protected void ddlPoliceStations_SelectedIndexChanged(object sender, EventArgs e)
{
lblPriority.Visible = true;
ddlPriority.Visible = true;
ddlDistricts.Visible = true;
}
答案 0 :(得分：0)
我建议你使用ajax级联下拉列表
通过使用它，您可以在没有任何回发启动的情况下实现绑定
跟进此链接
http://www.ajaxcontroltoolkit.com/CascadingDropDown/CascadingDropDown.aspx
希望这可以帮助你
答案 1 :(得分：0)
简单地将以下属性添加到＆lt;％@ Page＆gt;标签
MaintainScrollPositionOnPostback =＆＃34;真＆＃34;
<%@ Page Title="" MaintainScrollPositionOnPostback="true" Language="C#">
答案 2 :(得分：-2)
确定。
如果您仅在IE中测试此功能，它应该没有任何问题。但对于Chrome，您需要执行以下步骤：
this.MaintainScrollPositionOnPostBack = true;
另外，请参阅步骤： -
右键点击该项目 点击“添加” - ＆gt; “添加新项目”。在“添加新项”窗口中，选择“浏览器文件”，然后单击“添加”。 应用程序会要求您将此文件放在“App_Browsers”文件夹中，单击“是” 现在添加维护滚动位置的功能，如下所示：
<browsers>
<browser refID="Safari1Plus">
<capabilities>
<capability name="supportsMaintainScrollPositionOnPostback"
value="true" />
</capabilities>
</browser>