隐藏/显示的 AsyncFileUpload 控件不会触发服务器端 UploadedComplete 事件

发布于 2024-09-02 17:54:01 字数 1385 浏览 2 评论 0原文

我最近在最新版本 (3.0.40412) 的 ASP.Net Ajax Control Toolkit 中发现了 AsyncFileUpload 控件。在稍后显示的隐藏控件中使用它时似乎存在问题，例如带有 visible=false 的

标记。

示例：

页面代码 -

<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="act" %>
.
.
.
<act:ToolkitScriptManager runat="server" ID="ScriptManager1" />
<asp:UpdatePanel runat="server" ID="upnlFileUpload">
    <ContentTemplate>
        <asp:Button runat="server" ID="btnShowUpload" Text="Show Upload" />
        <div runat="server" id="divUpload" visible="false">
            <act:AsyncFileUpload runat="server" id="ctlFileUpload" />
        </div>
    </ContentTemplate>
</asp:UpdatePanel>

服务器端代码 -

Protected Sub ctlFileUpload_UploadedComplete(ByVal sender As Object, ByVal e As AjaxControlToolkit.AsyncFileUploadEventArgs) Handles ctlFileUpload.UploadedComplete

End Sub

Protected Sub btnShowUpload_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnShowUpload.Click
    divUpload.Visible = True
End Sub

我在 UploadedComplete 事件上有一个断点，但它从未触发。但是，如果将 AsyncFileUpload 控件从

中取出，使其在初始页面呈现时可见，则该控件将按预期工作。

那么，这是 AsynchUploadControl 中的一个错误，还是我没有掌握一个基本概念（这种情况经常发生）？

原文

I recently came across the AsyncFileUpload control in the latest (3.0.40412) release of the ASP.Net Ajax Control Toolkit. There appears to be an issue when using it in a hidden control that is later revealed, such as a <div> tag with visible=false.

Example:

Page code -

<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="act" %>
.
.
.
<act:ToolkitScriptManager runat="server" ID="ScriptManager1" />
<asp:UpdatePanel runat="server" ID="upnlFileUpload">
    <ContentTemplate>
        <asp:Button runat="server" ID="btnShowUpload" Text="Show Upload" />
        <div runat="server" id="divUpload" visible="false">
            <act:AsyncFileUpload runat="server" id="ctlFileUpload" />
        </div>
    </ContentTemplate>
</asp:UpdatePanel>

Server-side Code -

Protected Sub ctlFileUpload_UploadedComplete(ByVal sender As Object, ByVal e As AjaxControlToolkit.AsyncFileUploadEventArgs) Handles ctlFileUpload.UploadedComplete

End Sub

Protected Sub btnShowUpload_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnShowUpload.Click
    divUpload.Visible = True
End Sub

I have a breakpoint on the UploadedComplete event but it never fires. However, if you take the AsyncFileUpload control out of the <div>, making it visible at initial page render, the control works as expected.

So, is this a bug within the AsynchUploadControl, or am I not grasping a fundamental concept (which happens regularly)?

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