如何在asp.net中ConfirmButtonExtender之前调用javascript函数？

我有一个asp:按钮，我想在ConfirmButtonExtender采取行动之前调用javascript函数。但是我的javascript代码不起作用。请告诉我如何将ConfirmButtonExtender与javascript结合使用

<asp:Button ID="UpdatebuttonUpdaterID" runat="server" Text="Update" CssClass="create_role_button_in"
                                    OnClick="UpdatebuttonUpdaterID_Click" OnClientClick="return OnClientClickUpdate();"/>
                                    <ajaxToolkit:ConfirmButtonExtender ID="ConfirmButtonExtender3" runat="server" TargetControlID="UpdatebuttonUpdaterID"
                                    ConfirmText="Do you want to send this Conversion Rate for Approval?" ConfirmOnFormSubmit="true" OnClientCancel="CancelClick"/>

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您可以使用ConfirmButtonExtender的Behavior属性并向其添加javascript函数，这样一来，javascript函数将在ConfirmButtonExtender的ConfirmText属性之前被调用

将标记修改为以下内容：

<asp:Button ID="UpdatebuttonUpdaterID" runat="server" Text="Update" CssClass="create_role_button_in"
                                    OnClick="UpdatebuttonUpdaterID_Click" OnClientClick="return OnClientClickUpdate();"/>
                                    <ajaxToolkit:ConfirmButtonExtender BehaviorID="confirmBehavior" ID="ConfirmButtonExtender3" runat="server" TargetControlID="UpdatebuttonUpdaterID"
                                    ConfirmText="Do you want to send this Conversion Rate for Approval?" ConfirmOnFormSubmit="true" OnClientCancel="CancelClick"/>   
 <script type="text/ecmascript">
        Sys.Application.add_load(wireEvents);

        function wireEvents() {
            var behavior = $find("confirmBehavior");
            behavior.add_showing(OnClientClickUpdate);
        }

        function OnClientClickUpdate() {
            alert("hello");
        }
    </script>

---

您可以放弃使用confirm extender（除非您确实需要它）并使用javascript：

function OnClientClickUpdate()
{
   alert("first click");
   //do some stuff
   return confirm("are you sure?");
}

function OnClientClickUpdate()
{
   alert("first click");
   //do some stuff
   return confirm("are you sure?");
}