Question

我想要实现的基本上是这样的：

用户单击“另存为”按钮
对话框“弹出窗口”显示具有报告类别和名称条目的
用户输入名称，或选择加载旧报告的类别
后端将从对话框中获取值，并使用这些值来更新数据库中的报告

我的问题是，当我触发MyTreeView.SelectedNodeChanged事件时，我将重定向到我在对话框弹出窗口中显示的aspx页面。我有什么办法可以防止这种情况发生，或者包含回发？我包括了我的代码，但是我猜这将是我必须在aspx中解决的问题吗？

以下是一些代码：

ReportSave.aspx-在对话框窗口中

<%@ Page Language="VB" AutoEventWireup="false" CodeFile="ReportSave.aspx.vb" Inherits="ReportSave" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>Save Report As</title>
    <link href="ReportSaveStyle.css" rel="stylesheet" type="text/css"/>
</head>
<body>
    <form id="formReportSave" runat="server">
        <div class="container">
            <asp:Label class="report-list-title" ID="lblReportList" runat="server" Text="Report List"></asp:Label>
            <asp:TreeView class="report-list-items" ID="trvReportList" runat="server"></asp:TreeView>

            <asp:Label class="category-tree-title" ID="lblReportCategory" runat="server" Text="Report Category"></asp:Label>
            <asp:TreeView class="category-tree-items" ID="trvCategoryView" runat="server"></asp:TreeView>

            <asp:Label class="save-input-title" ID="lblReportName" runat="server" Text="Report Name"></asp:Label>
            <asp:TextBox class="save-input-textbox" ID="tbReportName" runat="server"></asp:TextBox>

            <asp:Button class="save-button1" ID="btnOK" runat="server" Text="OK" />
            <asp:Button class="save-button2" ID="btnCancel" runat="server" Text="Cancel" />
        </div>
    </form>
</body>
</html>

后端代码-ReportSave.aspx.vb

Private Sub trvCategoryView_SelectedNodeChanged(sender As Object, e As EventArgs) Handles trvCategoryView.SelectedNodeChanged
    Try
        'Dim li As ListItem
        'li = cblCategoryView.SelectedItem
        Dim node As TreeNode
        node = trvCategoryView.SelectedNode
        ' handle all categories
        If node.Value.ToString.ToUpper = "NEW CATEGORY" Then
            Dim strNC As String = InputBox("Enter Name for New Category", "Create Category")
            If strNC = "" Then
                Exit Sub
            End If
            If strNC.ToUpper = "NEW CATEGORY" Then
                ClientScript.RegisterStartupScript(Me.GetType(), "myalert", "window.alert('You can't have a Category Called New Category. Sorry!');", True)
                Exit Sub
            End If
            Dim conn As New SqlClient.SqlConnection(_ConnectionString)
            conn.Open()
            Dim cmd As New SqlClient.SqlCommand("Select recordno from Reports where ReportType = '" & strNC & "'", conn)
            Dim strresult As String = cmd.ExecuteScalar
            If IsNothing(strresult) Then
                Dim temp As TreeNode = New TreeNode(strNC, strNC, "Images/file.png")
                ' Dim temp As ListItem = New ListItem(strNC, strNC)
                'lvCategoryView.Items.Add(temp)
                'SetSelectedListItem(lvCategoryView.Items(lvCategoryView.Items.Count - 1))
                'cblCategoryView.Items.Add(temp)
                trvCategoryView.Nodes.Add(temp)
                FillReports()
                lblReportList.Text = "Report List for Group " & trvCategoryView.SelectedValue.ToString
                ' cblCategoryView.SelectedValue

                ClientScript.RegisterStartupScript(Me.GetType(), "myalert", "window.alert('That Report Group Already Exists');", True)
            End If
            cmd.Dispose()
            cmd = Nothing
            conn.Close()
            conn.Dispose()
            conn = Nothing
            Exit Sub
        Else
            'SetSelectedListItem(li)
            FillReports()
            lblReportList.Text = "Report List for Group " & trvCategoryView.SelectedValue.ToString
            'cblCategoryView.SelectedValue.ToString
        End If
    Catch ex As Exception

    End Try
End Sub

感谢您的任何帮助！我是Web开发以及ASP.NET的新手。：）

Answer 1

我假设您正在将此表单加载到iframe中，并且可能会想到问题出在MyTreeView.SelectedNodeChanged事件或父页面本身的实现上。

思维开阔，Web窗体可能有替代解决方案来实现您的目标。我最不喜欢实施iframe。根据您的特定要求，这些选项可能对您更好。

嵌套母版页
重叠式（弹出式）DIV元素中的可重复使用的用户控件（ascx）
更新面板中的重叠式（弹出式）DIV元素
AJAX发布到处理程序（ashx）

避免在TreeView SelectedNodeChanged上回发（在jquery对话框内）

1 个答案: