asp.net - asp:CheckBox 不会像 asp:Button 那样触发 BeginRequest

Question

<form id="form1" runat="server">
    <div>
        <asp:ScriptManager ID="ScriptManager1" runat="server" />

        <script type="text/javascript" language="javascript">
            Sys.WebForms.PageRequestManager.getInstance().add_beginRequest(BeginRequestHandler);
            Sys.WebForms.PageRequestManager.getInstance().add_endRequest(EndRequestHandler);
            function BeginRequestHandler(sender, args) {
                var elem = args.get_postBackElement();
                ActivateAlertDiv('visible', 'AlertDiv', elem.value + ' processing...');
            }
            function EndRequestHandler(sender, args) {
                ActivateAlertDiv('hidden', 'AlertDiv', '');
            }
            function ActivateAlertDiv(visstring, elem, msg) {
                var adiv = $get(elem);
                adiv.style.visibility = visstring;
                adiv.innerHTML = msg;
            }
        </script>

        <asp:UpdatePanel ID="UpdatePanel1" UpdateMode="Conditional" runat="Server">
            <ContentTemplate>
                <asp:Panel ID="Panel1" runat="server" GroupingText="Update Panel">
                    Last update:
                    <%= DateTime.Now.ToString()%>.
                    <br />
                    <asp:CheckBox runat="server" Text="Checkbox1" />
                    <asp:Button runat="server" ID="Button1" Text="Process 1" OnClick="ProcessClick_Handler" />
                    <asp:Button runat="server" ID="Button2" Text="Process 2" OnClick="ProcessClick_Handler" />
                </asp:Panel>
            </ContentTemplate>
        </asp:UpdatePanel>
        <div id="AlertDiv" class="AlertStyle">
        </div>
    </div>
</form>

Button1 和 Button2 触发了 beginRequest 事件，但 Checkbox1 没有。

Answer 1

您需要在复选框中将 AutoPostback 设置为 true：

    <asp:CheckBox ID="CheckBox1" runat="server" Text="Checkbox1"  AutoPostBack="true"/>

Answer 2

您必须将 CheckBox 的 AutoPostBack 属性设置为 True

Answer 3

添加AutoPostBack="true"和添加事件 oncheckedchanged="Checkbox1_CheckedChanged1"

<asp:CheckBox runat="server" Text="Checkbox1" AutoPostBack="true"
 oncheckedchanged="Checkbox1_CheckedChanged1"/>