c# - RadListView ItemCommand 未触发

Question

我有一个 RadListView 和一个绑定(bind)到 lstGameWaypoints_ItemCommand 的事件处理程序，如下所示。在第一次显示网格时，单击删除按钮成功触发回发和 ItemCommand 触发。

一旦回发完成，事件处理程序似乎不会再次连接，单击删除按钮不会导致任何操作发生。

有没有人以前遇到过类似的问题？

<telerik:RadListView runat="server" ID="RadListView1" 
DataSourceID="ObjectDataSource1" AllowPaging="true" 
OnDataBound="lstGameWaypoints_DataBound" 
OnItemCreated="lstGameWaypoints_ItemCreated" 
OnItemCommand="lstGameWaypoints_ItemCommand">
<EmptyDataTemplate>
    <div style="width: 100px;margin: 10px auto auto auto;"><button class="AddWaypoint">Add Waypoint</button></div>
</EmptyDataTemplate>
<ItemTemplate>
    <td>
        <table style="border:1px solid black;width: 232px;height: 70px;margin:auto;">
            <tr>
                <td>
                    Time:
                </td>
                <td>
                    <%# string.Format("{0:h:mm tt}", Eval("DateTime")) %>
                </td>
            </tr>
            <tr>
                <td>
                    Date:
                </td>
                <td>
                    <%# string.Format("{0:d}", Eval("DateTime")) %>
                </td>
            </tr>
            <tr>
                <td>
                    Chip Stack:
                </td>
                <td>
                    <%# string.Format("{0:C}", Eval("ChipStack")) %>
                </td>
            </tr>
            <tr>
                <td>
                    Notes:
                </td>
                <td>
                    <%# Eval("Notes") %>
                </td>
            </tr>
            <tr>    
                <td colspan="2" style="text-align:right;">
                    <asp:Button runat="server" ID="btnDelete" CssClass="deleteButton"  CommandArgument='<%# Eval("WaypointID") %>' CommandName="Delete" Text="X" OnClientClick="return confirm('Are you sure you want to delete this waypoint?');" />
                </td>
            </tr>
        </table>
    </td>
</ItemTemplate>
</telerik:RadListView>

protected void lstGameWaypoints_ItemCommand(object sender, Telerik.Web.UI.RadListViewCommandEventArgs e)
{
    if (e.CommandName == "Delete")
    {
        //Do stuff
    }
}

UPDATE:

这似乎是我用来托管此控件面板的 RadAjaxManager 的问题。如果我在面板上禁用 ajax，一切都会按预期进行。

这是一个完整的代码...

<telerik:RadAjaxManager ID="RadAjaxManager1" runat="server"> 
        <AjaxSettings>
            <telerik:AjaxSetting AjaxControlID="panGameWaypoints">
                <UpdatedControls>
                    <telerik:AjaxUpdatedControl ControlID="panGameWaypoints" LoadingPanelID="RadAjaxLoadingPanel1" />
                </UpdatedControls>
            </telerik:AjaxSetting>
            <telerik:AjaxSetting AjaxControlID="panGameDetails">
                <UpdatedControls>
                    <telerik:AjaxUpdatedControl ControlID="panGameDetails" LoadingPanelID="RadAjaxLoadingPanel1" />
                </UpdatedControls>
            </telerik:AjaxSetting>
        </AjaxSettings>
        <ClientEvents OnRequestStart="RequestStart" OnResponseEnd="RequestEnd" />
    </telerik:RadAjaxManager>

    <telerik:RadAjaxLoadingPanel ID="RadAjaxLoadingPanel1" runat="server" Transparency="60">
        <div class="loading">
            <asp:Image ID="Image1" runat="server" ImageUrl="~/Images/loading3.gif" AlternateText="loading" />
        </div>
    </telerik:RadAjaxLoadingPanel>

<asp:Panel runat="server" ID="panGameWaypoints" CssClass="GameWaypoints">
<table style="width:900px;margin:auto;">
        <tr>
            <telerik:RadListView runat="server" ID="lstGameWaypoints" AllowPaging="false" 
                OnDataBound="lstGameWaypoints_DataBound" 
                OnItemCreated="lstGameWaypoints_ItemCreated" 
                OnNeedDataSource="lstGameWaypoints_NeedDataSource">

                <EmptyDataTemplate>
                    <div style="width: 100px;margin: 10px auto auto auto;"><button class="AddWaypoint">Add Waypoint</button></div>
                </EmptyDataTemplate>
                <ItemTemplate>
                    <td>
                        <table style="border:1px solid black;width: 232px;height: 70px;margin:auto;">
                            <tr>
                                <td>
                                    Time:
                                </td>
                                <td>
                                    <%# string.Format("{0:h:mm tt}", Eval("DateTime")) %>
                                </td>
                            </tr>
                            <tr>
                                <td>
                                    Date:
                                </td>
                                <td>
                                    <%# string.Format("{0:d}", Eval("DateTime")) %>
                                </td>
                            </tr>
                            <tr>
                                <td>
                                    Chip Stack:
                                </td>
                                <td>
                                    <%# string.Format("{0:C}", Eval("ChipStack")) %>
                                </td>
                            </tr>
                            <tr>
                                <td>
                                    Notes:
                                </td>
                                <td>
                                    <%# Eval("Notes") %>
                                </td>
                            </tr>
                            <tr>    
                                <td colspan="2" style="text-align:right;">
                                    <asp:Button runat="server" ID="btnDelete" CssClass="deleteButton" CommandArgument='<%# Eval("WaypointID") %>' CommandName="Delete" Text="X" OnClientClick="return confirm('Are you sure you want to delete this waypoint?');" />
                                </td>
                            </tr>
                        </table>
                    </td>
                </ItemTemplate>
            </telerik:RadListView>
    </tr>
</table>
</asp:Panel>

Answer 1

我创建了一个小测试用例(包含在下面)以查看是否可以重现您的问题，您的实现与我的实现之间存在三个主要差异:

1. 我没有指定 RadAjaxLoadingPanel
2. 我没有指定任何 ClientEvents(即 RequestStart、RequestEnd)
3. 我没有使用 OnClientClick 确认对话框

---

解决方案 #1

在完成所有这些并将其添加到我的测试用例之后，我发现使用 RadAjaxManager 的确认对话框存在问题。一些研究提供了以下解决方案:

将您的 OnClientClick 代码更改为以下内容:

OnClientClick="if(!confirm('Are you sure you want delete this?')) return false;"

这能解决您的问题吗？

这里有一些关于这个问题的文档:
www.telerik.com/help/aspnet-ajax/ajax-confirmation.html

---

以上应该可以解决您的问题，但如果不能，请尝试暂时删除 RequestStart 和 RequestEnd 客户端事件，并继续剥离“extras”，直到找到问题为止。

这是一个按预期工作的测试用例:

ASPX:

<telerik:RadAjaxManager ID="rda" runat="server">
    <AjaxSettings>
        <telerik:AjaxSetting AjaxControlID="pnlTest">
            <UpdatedControls>
                <telerik:AjaxUpdatedControl ControlID="pnlTest" />
            </UpdatedControls>              
        </telerik:AjaxSetting>
    </AjaxSettings>
</telerik:RadAjaxManager>
<asp:Panel ID="pnlTest" runat="server">
    <telerik:RadListView ID="lst" runat="server" OnItemCommand="lst_Command" OnNeedDataSource="lst_NeedDataSource">
        <ItemTemplate>
            <%#Eval("Test")%>
            <asp:Button ID="btnDelete" runat="server" CommandArgument='<%#Eval("Test")%>' OnClientClick="if(!confirm('Are you sure you want delete this?')) return false;" CommandName="Delete" Text="Test" />
        </ItemTemplate>
    </telerik:RadListView>
    <asp:Label ID="lblCommandArg" runat="server"></asp:Label>
</asp:Panel>

代码隐藏:

protected void lst_NeedDataSource(object sender, RadListViewNeedDataSourceEventArgs e)
{
    DataTable table = new DataTable();
    table.Columns.Add("Test", typeof(string));

    DataRow row = table.NewRow();
    row.SetField<string>("Test", "Testing");
    table.Rows.Add(row);

    row = table.NewRow();
    row.SetField<string>("Test", "Testing again");
    table.Rows.Add(row);

    lst.DataSource = table;
}

protected void lst_Command(object sender, RadListViewCommandEventArgs e)
{
    lblCommandArg.Text = e.CommandArgument.ToString();
}

使用 RadAjaxPanel 而不是 RadAjaxManager

查看您的代码，看起来最简单的解决方案可能是使用 RadAjaxPanel 而不是 RadAjaxManager。我不确定这是否适合您，但这可能是让您的代码正常工作的最简单方法。

为 panGameWaypoints 使用 RadAjaxPanel 而不是常规面板，这将确保其中包含的所有内容都将使用 AJAX:

<telerik:RadAjaxPanel ID="panGameWaypoints" runat="server">
    <telerik:RadListView ID="RadListView1" runat="server" ... >
</telerik:RadAjaxPanel>