我有一个这样设置的网页： 有一个 ListView，它在我们的一个 SQL 表中的每条记录都有一个项目。这些项目中的每一个都有一个 CollapsiblePanel，可以展开它以显示有关给定记录的更多详细信息。
我的问题： 当我展开一个面板然后等待它完成时......一切都很好。但是，如果我尝试一次展开多个这些可折叠面板（意味着在第一个面板完全展开之前）......只有最后一个面板展开显示其数据。
我的问题： 是否可以让这些面板中的每一个都异步展开？我必须等待一个面板扩展才能扩展另一个面板，这似乎很愚蠢。
我的 aspx： 我通过删除不需要的代码来稍微修改了这个 aspx，以使其不那么混乱。
<asp:UpdatePanel ID="UpdPnlBGList" runat="server" ChildrenAsTriggers="true" UpdateMode="Conditional">
<ContentTemplate>
<div class="content-box">
<asp:Panel ID="pnlBGResult" runat="server">
<asp:ListView ID="lvSummary" runat="server" ItemPlaceholderID="placeholderBGList"
OnItemDataBound="lvSummary_ItemDataBound" OnItemCommand="lvSummary_ItemCommand">
<LayoutTemplate>
<table runat="server" id="tblList" cellpadding="0" cellspacing="0" border="0" style="table-layout: fixed;">
<tr id="placeholderBGList" runat="server">
</tr>
</table>
</LayoutTemplate>
<ItemTemplate>
<tr runat="server">
<td>
<asp:UpdatePanel ID="UpdBgItemTemplate" runat="server" ChildrenAsTriggers="true"
UpdateMode="Conditional">
<ContentTemplate>
<div class="bgList">
<asp:Panel ID="pnlSummary" runat="server">
<table id="tblBgList" runat="server" cellpadding="0" cellspacing="0" border="0" style="border-collapse: collapse;
border-spacing: 0px;">
<tr>
<td class="imageColumn">
<asp:ImageButton ID="imgCollapsible" CssClass="first" ImageUrl="~/Images/branding/plus.gif"
runat="server" CommandName="ExpandCollapse" Style="cursor: pointer; padding-right: 5px;" />
</td>
<td width="600px">
<asp:Label ID="lblBGName" runat="server" Text='<%# Eval("BGName")%>' CssClass="bgName"></asp:Label>
<asp:Label ID="lblDatePosted" runat="server" CssClass="datePosted"></asp:Label>
</td>
<td colspan="2">
<div style="float: right;">
<asp:Label ID="lblAccountNumber" runat="server" CssClass="accountReview"></asp:Label>
<asp:Label ID="lblAccountNumberText" runat="server" CssClass="accountReview"></asp:Label>
</div>
</td>
</tr>
<tr>
<td>
</td>
<td width="600px">
<asp:Label ID="lblBillToAddress" runat="server" Text='<%# Eval("BillToAddress")%>'
CssClass="billToAddress" Style="font-weight: bold;"></asp:Label>
</td>
<td>
<div style="float: right;">
<asp:ImageButton ID="imgViewAuthLetter" ImageUrl="~/Images/branding/document.jpeg"
CssClass="first" runat="server" OnClick="imgViewAuthLetter_Click" />
<asp:LinkButton ID="lnkAuthorizationLetter" runat="server" Text="View authorization letter"
class="link_button" OnClick="lnkAuthorizationLetter_Click" OnClientClick="dirtySuppress();"
OnPreRender="addTrigger_PreRender" />
</div>
</td>
<td width="70px" style="float: right;">
<div style="float: right;">
<asp:HyperLink ID="lnkExportImage" runat="server" ImageUrl="/Images/branding/export.jpg"
CssClass="hiperlinkExport" OnClick="dirtySuppress();" />
<asp:HyperLink ID="lnkExportText" runat="server" Text="Export" CssClass="hiperlinkExport"
OnClick="dirtySuppress(); precheckURL(this.href); return false;" />
</div>
</td>
</tr>
<tr>
<td colspan="4" style="padding: 0px;">
<asp:Panel Style="margin-left: 50px;" ID="pnlDetails" runat="server">
<of:AccountNumberListControl ID="accountNumberList" runat="server"></of:AccountNumberListControl>
</asp:Panel>
<cc1:CollapsiblePanelExtender ID="cpe" runat="Server" TargetControlID="pnlDetails"
CollapsedSize="0" Collapsed="True" ExpandControlID="imgCollapsible" CollapseControlID="imgCollapsible"
AutoCollapse="False" AutoExpand="False" ScrollContents="false" ImageControlID="imgCollapsible"
ExpandedImage="~/Images/branding/minus.gif" CollapsedImage="~/Images/branding/plus.gif"
ExpandDirection="Vertical" />
</td>
</tr>
<tr>
<td>
</td>
<td colspan="3" style="padding: 0px;">
<div class="itemSeperator" id="divItemSeperator" runat="server">
</div>
</td>
</tr>
</table>
</asp:Panel>
</div>
</ContentTemplate>
</asp:UpdatePanel>
</td>
</tr>
</ItemTemplate>
</asp:ListView>
<asp:HiddenField ID="hdfAccountNumberListControlID" runat="server" Value="" />
<asp:HiddenField ID="hdfAccountNumerID" runat="server" Value="" />
</asp:Panel>
</div>
<of:CustomerSetupExportPopInControl ID="customerSetupExportPopIn" runat="server" />
</ContentTemplate>
我的代码隐藏：
这是展开面板时执行的代码。有几个控件被填充。
private void ExpandBillingGroup(ListViewDataItem item)
{
Label accountNumberLabel;
Label accountNumberText;
HtmlControl itemSeperator;
AccountNumberListControl accountNumberList;
// set properties for fedex account number label and text.
accountNumberLabel = (Label)item.FindControl("lblAccountNumber");
accountNumberLabel.Text = "FedEx account number: ";
accountNumberLabel.CssClass = "fedExAccountNumberLabel";
accountNumberText = (Label)item.FindControl("lblAccountNumberText");
accountNumberText.Text = lvSummary.DataKeys[item.DisplayIndex].Values["FedExAccountNumber"].ToString();
accountNumberText.CssClass = "fedExAccountNumberText";
//set the properties for Export
var lnkExportImage = (HyperLink)item.FindControl("lnkExportImage");
lnkExportImage.Visible = true;
var lnkExportText = (HyperLink)item.FindControl("lnkExportText");
lnkExportText.Visible = true;
//When expanded populate Customer Setup Export control
customerSetupExportPopIn.BillingGroupID = lvSummary.DataKeys[item.DisplayIndex].Values["BillingGroupID"].ToString();
//When expanded populate AccountNumberlistControl
accountNumberList = (AccountNumberListControl)item.FindControl("accountNumberList");
if (accountNumberList != null)
{
//since we make the AccountNumberListControl not visible on collapse we have to make it visible when we expand
accountNumberList.Visible = true;
//Set the properties
accountNumberList.BillingGroupID = lvSummary.DataKeys[item.DisplayIndex].Values["BillingGroupID"].ToString();
accountNumberList.FedExAccountNumber = lvSummary.DataKeys[item.DisplayIndex].Values["FedExAccountNumber"].ToString();
accountNumberList.BillingGroupName = ((Label)lvSummary.Items[item.DisplayIndex].FindControl("lblBGName")).Text;
accountNumberList.BillToAddress = ((Label)lvSummary.Items[item.DisplayIndex].FindControl("lblBillToAddress")).Text;
accountNumberList.FirstItemNeedsToExpand = BillingGroupIsResolved;
accountNumberList.GetListOfAccountNumbers(lvSummary.DataKeys[item.DisplayIndex].Values["BillingGroupID"].ToString(), VendorID);
}
//set the properties for itemSepeartor
itemSeperator = (HtmlControl)item.FindControl("divItemSeperator");
itemSeperator.Attributes.Add("class", "itemSeperatorExpanded");
UpdatePanel upd = (UpdatePanel)item.FindControl("UpdBgItemTemplate");
upd.Update();
}
谢谢，霍尔特
编辑：修正语法和标题问题