下面包括我对使用 FineUploader 控件的页面的标记。我已将代码删减为仅包含重要部分。此页面是两个部分，都驻留在 UpdatePanel 中。第一部分是一个包含多行数据的简单表格，每行的最后一列是一个asp:LinkButton。第二部分是一个嵌套的 UpdatePanel，其中包含一个 div，在第一次加载页面时会在其中呈现 FineUploader 控件（因为 FineUploader 控件是严格的 javascript 并且不进一步存在于代码隐藏中）。此外，当按下 LinkButton 时this.Page.IsPostBack是false.
问题是，每当按下页面第一部分的 LinkButton 时，FineUploader 控件就会消失。我无法从代码隐藏中重新渲染代码（使用类似的东西ClientScript.RegisterStartupScript/RegisterClientScriptBlock）。我还尝试了各种设置，用 UpdatePanel 包装第 1 部分，但它仍然清除了我的 FineUploader 控件。我在想我错误地使用了更新面板，但我不确定（ASP.NET 通常不是我工作的）。
作为补充细节，如果我单击第 2 部分嵌套的 UpdatePanel 中的按钮，我的 FineUploader 控件会神奇地重新出现。
标记（为了可见性，重要部分用多行标记，大部分是空的注释块）：
<%@ Page Title="" Language="C#" MasterPageFile="~/Site.Master" AutoEventWireup="true" CodeBehind="Setup.aspx.cs" Inherits="Some_Portal.Pages.Setup" %>
<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" runat="Server">
<div id="locationInfo">
<br class="clearfloat" />
<!-- Main Screen Display breaking down the types of information -->
<asp:UpdatePanel runat="server" ID="updExtensions">
<Triggers>
<asp:PostBackTrigger ControlID="btnDownloadCall" />
</Triggers>
<ContentTemplate>
<script type='text/javascript' src='http://code.jquery.com/jquery-1.7.1.js'></script>
<style type='text/css'>
.filename {
visibility: hidden;
height: 0;
width: 0;
display: block;
}
</style>
<!-- This portion is to enable the file uploader: -->
<link href="../js/fineuploader/fineuploader-3.5.0.css" rel="stylesheet">
<script type="text/javascript" src="../js/fineuploader/fineuploader-3.5.0.js"></script>
<script type="text/javascript">
$(document).ready(function () {
var uploader = new qq.FineUploader({
element: $('#fine-uploader')[0],
request: {
endpoint: 'AccountSetup.aspx'
},
autoUpload: true,
multiple: false,
text: {
uploadButton: '<asp:Button ID="fineUploadButton" runat="server" CssClass="button" style="width:6;5" Text="Browse" />'
},
validation: {
allowedExtensions: ['mp3', 'wav']
}
});
});
</script>
<!-- -->
<!-- -->
<!-- Part 1 -->
<!-- -->
<!-- -->
<table width="100%" cellpadding="0" border="0px" style="border-color:white;">
<tr>
<th>Extensions</th>
</tr>
<tr>
<td style="width: 100%; border:0; border-bottom-color:white; border-bottom-style:none;">
<asp:DataGrid ID="dgExtensions" runat="server" AllowSorting="true" AllowPaging="true" PagerStyle-BorderStyle="None" PagerStyle-BorderColor="white" PagerStyle-BorderWidth="0px"
AutoGenerateColumns="false" PageSize="10" DataKeyField="id" OnPageIndexChanged="dgExtensions_OnPageIndexChanged"
PagerStyle-Mode="NumericPages" PagerStyle-HorizontalAlign="Right" OnSortCommand="dgExtensions_OnSortCommand"
Width="100%" BorderColor="White"
HeaderStyle-CssClass="GridHeader"
ItemStyle-CssClass="GridItem"
AlternatingItemStyle-CssClass="GridAltItem">
<Columns>
<asp:BoundColumn DataField="number" HeaderText="Number" SortExpression="number">
<ItemStyle HorizontalAlign="center" Width="8%" />
<HeaderStyle HorizontalAlign="center" Width="8%" />
</asp:BoundColumn>
<asp:BoundColumn DataField="extensionType" HeaderText="Type" SortExpression="extensionType">
<ItemStyle HorizontalAlign="center" Width="18%" />
<HeaderStyle HorizontalAlign="center" Width="18%" />
</asp:BoundColumn>
<asp:TemplateColumn HeaderText="Description" SortExpression="description">
<HeaderStyle Width="25%" CssClass="dgLeftPad" />
<ItemStyle Width="25%" CssClass="dgLeftPad" />
<ItemTemplate>
<asp:Literal runat="Server" ID="litExtensionDescription" Text='<%# Eval("description").ToString() %>' />
<asp:HiddenField runat="server" ID="hidExtensionID" Value='<%# Eval("id").ToString() %>' />
<asp:HiddenField runat="server" ID="hidExtensionTypeID" Value='<%# Eval("extensiontypeid").ToString() %>' />
<asp:HiddenField runat="server" ID="hidPrevDescription" Value='<%# Eval("description").ToString() %>' />
</ItemTemplate>
</asp:TemplateColumn>
<asp:BoundColumn DataField="status" HeaderText="Status" SortExpression="status">
<ItemStyle HorizontalAlign="center" Width="24%" />
<HeaderStyle HorizontalAlign="center" Width="24%" />
</asp:BoundColumn>
<asp:TemplateColumn HeaderText="">
<HeaderStyle Width="10%" />
<ItemStyle Width="10%" HorizontalAlign="center" />
<ItemTemplate>
<!-- -->
<!-- -->
<!-- Clicking this makes the Fine -->
<!-- Uploader control go away. -->
<!-- -->
<!-- -->
<asp:LinkButton runat="Server" ID="lbEditExtension" CommandArgument='<%# Eval("id").ToString() %>'
OnCommand="EditExtension" Text="Edit" Visible='<%# SetEditEnabled(Eval("extensiontypeid").ToString()) %>'/>
</ItemTemplate>
</asp:TemplateColumn>
</Columns>
<HeaderStyle BackColor="#eeeeee" />
<PagerStyle HorizontalAlign="Right" Mode="NumericPages" />
</asp:DataGrid>
</td>
</tr>
<tr>
<asp:Panel runat="server" ID="pnlNoExtensions">
<td colspan="3" align="center" style="color: Red;">
There are no extensions established for your account
</td>
</asp:Panel>
</tr>
</table>
<br />
<!-- -->
<!-- -->
<!-- Part 2 -->
<!-- -->
<!-- -->
<asp:Panel runat="server" ID="Panel1" Width="100%">
<asp:UpdatePanel runat="server" ID="updRouteGroup" UpdateMode="Conditional">
<Triggers>
<asp:PostBackTrigger ControlID="btnDisableOnHold" />
</Triggers>
<ContentTemplate>
<asp:Panel ID="pnlImpExcel" runat="Server" >
<div style="width:100%">
<table colspan="0" width="100%" cellpadding="0" cellspacing="0">
<tr>
<th colspan="3">
On Hold Music
</th>
</tr>
<tr>
<!-- -->
<!-- FineUploader Control -->
<!-- -->
<td align="left" valign="middle"><div id="fine-uploader"></div></td>
<td align="center" valign="middle"><asp:Label ID="lblOnHoldFile" runat="server" Text="Current file: none"/></td>
<td align="right" valign="middle"><asp:Button ID="btnDisableOnHold" runat="server" style="margin-right:7px;width:87px;" Text="Disable Hold Music" CssClass="button" OnClick="btnDisableOnHold_OnClick" /></td>
</tr>
<tr><td colspan ="2" align="center"><asp:Label runat="server" ID="lblUploadError" style="color: Red;" Visible="false" /></td></tr>
</table>
</div>
</asp:Panel>
</ContentTemplate>
</asp:UpdatePanel>
</asp:Panel>
<!-- The Operator Extension Panel -->
<asp:Panel runat="server" ID="Panel2">
<asp:UpdatePanel runat="server" ID="UpdatePanel1" UpdateMode="Conditional">
<Triggers>
<asp:PostBackTrigger ControlID="btnOperatorUpdate" />
</Triggers>
<ContentTemplate>
<asp:Panel ID="Panel3" runat="Server" >
<div>
<table colspan="0" width="100%" cellpadding="0" cellspacing="0">
<tr>
<th colspan="3">
Operator Extension
<asp:Button ID="btnOperatorUpdate" runat="server" Text="Save" CssClass="button" style="margin-right:2px;width:87px;float:right;padding-right:10px;" OnClick="btnOperatorUpdate_OnClick" />
<asp:DropDownList runat="Server" ID="ddlOperatorExtension" style="float:right;margin-right:10px;" Width="250px" AutoPostBack="false" />
</th>
</tr>
</table>
<br />
</div>
</asp:Panel>
</ContentTemplate>
</asp:UpdatePanel>
</asp:Panel>
</ContentTemplate>
</asp:UpdatePanel>
</div>
</asp:Content>
如何使我的 FineUploader 控件保持可见？
编辑 1：考虑到这可能是页面生命周期问题，我尝试通过添加以下内容来手动呈现控件：
protected void Page_Init(object sender, EventArgs e)
{
string script = "<script type=\"text/javascript\">" +
" alert('oh hey');" +
" $(document).ready(function () {" +
" var uploader = new qq.FineUploader({" +
" element: $('#fine-uploader')[0]," +
" request: {" +
" endpoint: 'AccountSetup.aspx'" +
" }," +
" autoUpload: true," +
" multiple: false," +
" text: {" +
" uploadButton: '<asp:Button ID=\"fineUploadButton\" runat=\"server\" CssClass=\"button\" style=\"width:6;5\" Text=\"Browse\" />'" +
" }," +
" validation: {" +
" allowedExtensions: ['mp3', 'wav']" +
" }" +
" });" +
" });" +
"</script>";
ClientScript.RegisterClientScriptBlock(this.GetType(), "HideOnPostback", script, false);
System.Diagnostics.Debug.WriteLine("Page_Init() run");
}
结果是，如果我单击第 1 部分中的“编辑”链接按钮，我会在调试输出中看到“Page_Init() 运行”，但控件仍然消失，并且永远不会显示“哦，嘿”js 警报。但是，如果我单击第 2 部分中的另一个按钮，我会在调试输出中看到“Page_Init() 运行”，我会看到“哦，嘿”警报，并且 FineUploader 按钮仍然可见。