当我使用Timer事件标记来触发动画更新面板刷新时，我收到以下错误：
TypeError: sender._activeElement is undefined
Sys.Extended.UI.Animation.UpdatePanelAnimationBehavior.prototype._partialUpdateBeginRequest()
ScriptResource.axd:75
Function$createDelegate/<()
ScriptResource.axd:47
Sys$EventHandlerList$getHandler/<()
ScriptResource.axd:3484
Sys$WebForms$PageRequestManager$_onFormSubmit()
ScriptResource.axd:1284
Sys$WebForms$PageRequestManager$_doPostBack()
ScriptResource.axd:824
Function$createDelegate/<()
ScriptResource.axd:47
Sys$UI$_Timer$_doPostback()
ScriptResource.axd:60
Sys$UI$_Timer$_raiseTick()
ScriptResource.axd:91
Function$createDelegate/<()
如果我使用button click事件，它可以正常运行动画，但我需要时间。如果我删除了UpdatePanelAnimationExtender，则计时器刷新工作正常，但我没有动画。
我正在使用Ajax Control Toolkit 16。
<%@ Page Language="VB" AutoEventWireup="True" CodeFile="Test2.aspx.vb" Inherits="_Default" Debug="True" %>
<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="ajaxToolkit" %>
<!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">
<title></title>
<link href="ds2.css" rel="stylesheet" type="text/css" />
</head>
<body>
<form id="form1" runat="server">
<asp:scriptmanager ID="Scriptmanager1" runat="server"></asp:scriptmanager>
<div><div style="float:right; color:gray;"><asp:Label Visible="true" ID="Label1" runat="server" Text="1"></asp:Label></div>
<ajaxToolkit:UpdatePanelAnimationExtender ID="UpdatePanelAnimationExtender1" runat="server" TargetControlID="logoUpdatePanel">
<Animations><OnUpdating><Sequence>
<EnableAction AnimationTarget="effect_color" Enabled="true" />
<EnableAction AnimationTarget="effect_collapse" Enabled="true" />
<EnableAction AnimationTarget="effect_fade" Enabled="true" />
<Parallel Duration="1" Fps="20">
<FadeOut AnimationTarget="PanelInfo" minimumOpacity=".2" />
<color AnimationTarget="PanelInfo" StartValue="#FFEF3F" EndValue="#FFFFFF" Property="style" PropertyKey="backgroundColor" />
</Parallel></Sequence></OnUpdating>
<OnUpdated>
<Sequence>
<EnableAction AnimationTarget="effect_collapse" Enabled="true" />
<EnableAction AnimationTarget="effect_fade" Enabled="true" />
<Parallel Duration="1" Fps="20">
<FadeIn AnimationTarget="logoUpdatePanel" />
<Resize Height="0" />
</Parallel>
</Sequence>
</OnUpdated></Animations>
</ajaxToolkit:UpdatePanelAnimationExtender>
<asp:UpdatePanel ID="logoUpdatePanel" runat="server" UpdateMode="Conditional" >
<ContentTemplate>
<asp:Image ID="Logo1" runat="server" ImageUrl="~/Images/RBCCCW_1080p_Horizontal.jpg" ImageAlign="Middle" />
<asp:Label Visible="false" runat="server" ID="TableCount" Text="tablecount"></asp:Label>
<asp:Label visible="false" runat="server" ID="rowcount" Text="rowcount"></asp:Label>
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="Timer1" EventName="Tick" />
</Triggers>
</asp:UpdatePanel>
</div>
<div>
<asp:UpdatePanel ID="UpdatePanel1" runat="server" updatemode="Conditional">
<ContentTemplate>
<asp:Timer ID="Timer1" runat="server" Interval="10000" OnTick="bindlist"></asp:Timer>
<asp:DataList ID="RoomEventsList" runat="server" Width="1080px" CellPadding="10" CellSpacing="5" HeaderStyle-BackColor="#0060AA" AlternatingItemStyle-BackColor="#a8cde2" Font-Size="24pt">
<HeaderTemplate>
<div class="colhead1">Start</div><div class="colhead2">Events</div>
</HeaderTemplate>
<ItemTemplate>
<div class="col1"><%#Eval("fstf").ToString.ToLower()%></div><div class="col2"><span style="font-weight:bold"><%#Eval("EV700_ALT_FUNC_DESC")%></span> <br /><span style="float:right;font-size:22pt"> <%#Eval("EV800_SPACE_DESC")%> | <%#Eval("EV812_HIER_LVL2_DESC")%> | <%#Eval("EV811_HIER_LVL1_DESC")%> </span></div>
</ItemTemplate>
<FooterTemplate>
</FooterTemplate>
</asp:DataList>
<table width="100%"><tr><td></td><td align="right">
<asp:Label Visible="false" runat="server" ID="pagenumber" Text="start"></asp:Label><asp:Label Visible="false" ID="lblTotalPages" runat="server" Text="1"></asp:Label></td></tr></table>
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="Timer1" EventName="Tick" />
</Triggers>
</asp:UpdatePanel>
</div>
</form>
</body>
</html>
和背后的代码：
Imports System.Data
Imports System.Data.SqlClient
Imports System.Web.Services
Imports System.Collections.Generic
Imports System.Configuration
Partial Class _Default
Inherits System.Web.UI.Page
Dim pagedDSr As New PagedDataSource()
Dim totalPages As Integer
Dim totalImages As Integer
Public Property CurrentPage() As Integer
Get
Return IIf(ViewState("CurrentPage") Is Nothing, 0, CInt(ViewState("CurrentPage")))
End Get
Set(value As Integer)
ViewState("CurrentPage") = value
End Set
End Property
Public Property imagecount() As Integer
Get
Return IIf(ViewState("imagecount") Is Nothing, 0, CInt(ViewState("imagecount")))
End Get
Set(value As Integer)
ViewState("imagecount") = value
End Set
End Property
Public Property imageSize() As String
Get
Return IIf(ViewState("imageSize") Is Nothing, "", CStr(ViewState("imageSize")))
End Get
Set(value As String)
ViewState("imageSize") = value
End Set
End Property
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
If Not Page.IsPostBack() Then
CurrentPage = 0
imagecount = 1
TableCount.Text = "0"
bindlist()
End If
End Sub
Sub changelogo()
Logo1.ImageUrl = "~/Images/" & imagesize & "/" & imagecount & ".jpg"
If imagecount = IO.Directory.GetFiles("C:\inetpub\digsignall\Images\" & imageSize & "\", "*.jpg").Length Then
imagecount = 1
TableCount.Text = imagecount.ToString
Else
imagecount = imagecount + 1
TableCount.Text = imagecount.ToString
End If
End Sub
Sub bindlist()
Dim strConnString As String = ConfigurationManager.ConnectionStrings("ebmsprodCS").ConnectionString
Dim con As New SqlConnection(strConnString)
Using conn As New SqlConnection(strConnString)
Dim varname1 As New System.Text.StringBuilder
varname1.Append("SELECT statement removed for space")
Dim cmd As New SqlCommand(varname1.ToString, conn)
cmd.CommandType = CommandType.Text
conn.Open()
'Dim drEvents As SqlDataReader = cmd.ExecuteReader()
Dim eventsda = New SqlDataAdapter(cmd)
Dim ds = New DataSet
eventsda.Fill(ds, "events")
If ds.Tables(0).Rows.Count <= 0 Then
RoomEventsList.Visible = False
imagesize = "fullscreen"
rowcount.Text = IO.Directory.GetFiles("C:\inetpub\digsignall\Images\" & imageSize & "\", "*.jpg").Length
changelogo()
Else
RoomEventsList.Visible = True
imageSize = "top"
changelogo()
End If
pagedDSr.DataSource = ds.Tables(0).DefaultView
pagedDSr.AllowPaging = True
pagedDSr.PageSize = 10
pagedDSr.CurrentPageIndex = CurrentPage
totalPages = pagedDSr.PageCount
RoomEventsList.DataSource = pagedDSr
RoomEventsList.DataBind()
conn.Close()
Label1.Text = Request.QueryString("room")
End Using
If pagedDSr.IsLastPage Then
CurrentPage = 0
Else
CurrentPage = CurrentPage + 1
End If
pagenumber.Text = CurrentPage.ToString
End Sub
Protected Sub bindlist_tick()
pagedDSr.CurrentPageIndex = CurrentPage
RoomEventsList.DataSource = pagedDSr
RoomEventsList.DataBind()
If pagedDSr.IsLastPage Then
CurrentPage = 0
Else
CurrentPage = CurrentPage + 1
End If
pagenumber.Text = CurrentPage.ToString
End Sub
End Class