Question

我有一个简单的UpdatePanel和一个外面的按钮。我在UpdatePanel中将按钮作为AsyncPostBackTrigger引入。 UpdatePanel本身工作正常，但按钮没有。只要单击该按钮，其单击处理程序就不会像完全没有单击按钮那样运行！

为什么按钮不起作用以及如何修复？

更新：这是标记：

            <asp:UpdatePanel ID="upGridView" runat="server" UpdateMode="Conditional">
            <ContentTemplate>
                <asp:GridView ID="grdList" SkinID="SimpleGridView" DataKeyNames="Key" runat="server"
                    AllowPaging="True" PageSize="15" AutoGenerateColumns="False" Caption="<%$ Resources: CommonResources, grdListCaption %>"
                    EmptyDataText="<%$ Resources: CommonResources, grdListEmptyDataText %>" OnRowEditing="grdList_RowEditing"
                    OnPageIndexChanging="grdList_PageIndexChanging" OnRowCreated="grdList_RowCreated">
                    <Columns>

                    </Columns>
                </asp:GridView>
            </ContentTemplate>
            <Triggers>
                <asp:AsyncPostBackTrigger ControlID="btnDelete" EventName="Click" />
                <asp:AsyncPostBackTrigger ControlID="btnNew" EventName="Click" />
                <asp:AsyncPostBackTrigger ControlID="btnForward" EventName="Click" />
            </Triggers>
        </asp:UpdatePanel>

        <asp:Button ID="btnDelete" runat="server" SkinID="Button" Text="<%$ Resources: CommonResources, btnDelete %>"
            OnClick="btnDelete_Click" />
        <asp:Button ID="btnNew" runat="server" SkinID="Button" Text="<%$ Resources: CommonResources, btnNew %>"
            OnClick="btnNew_Click" />
        <asp:Button ID="btnForward" runat="server" SkinID="Button" meta:resourcekey="btnForward"
            OnClick="btnForward_Click" />

Answer 1

因为它清楚你的页面（模块）在Page_Load事件中做了一些事情而且这个事件阻止了你的按钮的反复。

我的意思是你尝试回发，并且Page_Load事件再次运行，所有内容都是第一次出现，

我有这个问题并通过放置

来解决

  if(!IsPostBack)
      DoSomething();

Answer 2

<asp:UpdatePanel ID="UpdatePanel1" ChildrenAsTriggers="False" UpdateMode="Conditional" runat="server">
            <ContentTemplate> 
   <form id="form1" runat="server"  defaultbutton="btnSearch">

   <div>
             <asp:ScriptManager ID="ScriptManager1" EnablePartialRendering="true"
runat="server">
        </asp:ScriptManager>
   <script language="javascript" type="text/javascript"> 



   var prm = Sys.WebForms.PageRequestManager.getInstance(); 

   prm.add_initializeRequest(InitializeRequest); 
   prm.add_endRequest(EndRequest); 
   var postBackElement; 
   function InitializeRequest(sender, args) 
   { 

      if (prm.get_isInAsyncPostBack()) 
         args.set_cancel(true); 
      postBackElement = args.get_postBackElement(); 
      if (postBackElement.id == 'btnSearch') 
         $get('UpdateProgress1').style.display = 'block'; 

   } 



   function EndRequest(sender, args) 
   { 
       if (postBackElement.id == 'btnSearch') 
          $get('UpdateProgress1').style.display = 'none'; 

   } 



</script>
    </div>        


       <asp:GridView ID>

        <Columns>
          <asp:TemplateField>
             <HeaderTemplate>
             <asp:Label ID="Label2" runat="server" Text="Status"></asp:Label>  
              <asp:CheckBox ID="chkSelectAll" runat="server"  onclick="javascript:HighlightRow(this);"
              AutoPostBack="true"  ToolTip="Click here to select all checkboxes"
              OnCheckedChanged="chkSelectAll_CheckedChanged"/>
             </HeaderTemplate>
             <ItemTemplate >

             <asp:CheckBox ID="CheckBox1" onclick="javascript:HighlightRow(this);" 
                        AutoPostBack="true" runat="server"
                        OnCheckedChanged="CheckBox1_CheckedChanged1" />


            </ItemTemplate>

            </asp:TemplateField>

    <asp:BoundField
</asp:GridView>

</ContentTemplate>
       <Triggers> 
            <asp:AsyncPostBackTrigger  ControlID="btnSearch"  EventName="Click"/>

        </Triggers>
        </asp:UpdatePanel>
          <asp:UpdateProgress ID="UpdateProgress1"  AssociatedUpdatePanelID="UpdatePanel1"  runat="server" ><ProgressTemplate>
                 <asp:Image ID="Imgwait" runat="server" 
                     ImageUrl="~/Content/images/images/ApImages/001413_0.gif" />
                 <asp:Label ID="Lblwait" runat="server" 
                     Text="Please wait while we process your request...." Font-Names="Tahoma" 
                     Font-Size="10px" ForeColor="#990000"></asp:Label>
</ProgressTemplate>
</asp:UpdateProgress>

   <div style="position: absolute;left:55%;top: 65%; vertical-align:middle; width:300px; text-align:center">
 <asp:Panel ID="IMGDV" runat="server"  Width="300px"  
            BackColor="#3D3327" Visible="False" BorderStyle="Outset">
         <asp:Image ID="Image4" runat="server" 
             ImageUrl=" " Width="16px" 
             ToolTip="write your notes here for closure" />
   <asp:Label ID="Label1" runat="server"  CssClass="GridHeader" 
             Text="Please Provide note ."></asp:Label>
    <table style="border-style: solid; border-width: thin; width: 100%; background-color: #D3CCC2;"><tr><td style=" text-align:center">


        <asp:TextBox ID="TextBox2" Textmode="MultiLine"  Height="80px" Width="250px" 
            CssClass="heading1" runat="server" ontextchanged="TextBox2_TextChanged" 
            BackColor="#D9D9CA" BorderColor="#3E1F00" BorderStyle="Inset"></asp:TextBox>
    </td></tr>
    </table>

   <table  style="border-style: outset; border-width: medium; width: 100%; background-color: #BDB2A4;">
   <tr>

    <td style=" text-align:left">
    <asp:panel runat="server" ID="pnlsub" BackColor="#3D3327" 
         BorderStyle="Outset" Width="90%" ToolTip="Submit">

         <asp:Button ID="Button1" runat="server" Text="Submit" CssClass="Button"  BorderStyle="Solid" BorderColor="#3D3327" onclick="Button1_Click"/>
                         </asp:panel>
        </td>
        <td style=" text-align:left">
        <asp:panel runat="server" ID="pnlcan" BackColor="#3D3327" 
         BorderStyle="Outset" Width="90%" ToolTip="Cancel">

             <asp:Button ID="Button2" runat="server" Text="Cancel" CssClass="Button" BorderStyle="Solid" BorderColor="#3D3327" onclick="Button2_Click"/>  
             </td>
         </tr>
             </table>
        </asp:Panel >
    </div>

背后的代码

protected void CheckBox1_CheckedChanged1(object sender, EventArgs e)
        {
 IMGDV.Visible = true;

}

On复选框checkedchanged事件想要显示面板控件，但它不显示面板控件帮助...

AsyncPostBackTrigger禁用按钮

2 个答案: