如何使用Javascript清除基于复选框的文本框

我正在尝试用javascript编码（以避免服务器上的验证触发器）以清除文本框（如果未选中与之关联的复选框）。

我有这个代码...

    <input type="checkbox" id="chkOTHER" onclick="document.getElementById('txtOtherFlag').value='';" />
    <asp:TextBox ID="txtOtherFlag" runat="server" AutoPostBack="True" CausesValidation="True" ValidationGroup="ValidationGroup1"></asp:TextBox>

问题是复选框内的 Javascript 没有触发删除文本框中的值。即使这有效，它也不正确，因为每次触发复选框时，无论是否选中，它都会空白文本框。

我只需要在客户端解决这个问题。

谢谢

[更新]

根据要求，这是我的整个ASPX页面减去与问题无关的部分......

    <%@ Page Language="C#" MasterPageFile="~/Attendance/Attendance.master" AutoEventWireup="true" CodeFile="ClassAttendance.aspx.cs" Inherits="Attendance_ClassAttendance" 
        Title="Class Attendance" Culture="en-AU" %>
    <%@Register TagPrefix="tecnq" TagName="ResetPassword" Src="~/Controls/ResetPassword.ascx" %>
    <%@Register TagPrefix="tecnq" TagName="ContactLog" Src="~/Controls/ContactLogKPI.ascx" %>
    <asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
...
we go now to my panel and table ...
...
    <asp:panel ID="PanelPreStart" runat="server" Visible="false" Enabled="false" >
    <table runat="server" id="tblPreStart" style="width: 649px; height: 543px; border-right: activecaption thin solid; border-top: activecaption thin solid; border-left: activecaption thin solid; border-bottom: activecaption thin solid; background-color: white; background-image: none;">
...
we now go to the checkbox and textbox controls within a customvalidator ...
...
        <tr>
            <td id="tdDocs" runat="server" style="table-layout: fixed; visibility: visible; overflow: auto; border-collapse: separate; font-size: 12pt; vertical-align: top; text-align: left; font-weight: bold; font-family: Arial; background-color: transparent; width: 799px; background-image: none;" colspan="2">
                <strong>What documents will be required for today's tasks?<br /></strong>
                    <span style="font-size: 9pt">(Please ensure supporting documentation is attached)</span>
                <asp:CustomValidator ID="CustomValidator12" runat="server"
                        ErrorMessage='Tick one of the "Documents required today" section tick boxes.' OnServerValidate="CustomValidator12_ServerValidate" ValidationGroup="ValidationGroup1" Font-Names="Arial" Font-Size="9pt">*</asp:CustomValidator><br />
                    <table style="width: 651px; font-weight: bold; font-size: 10pt; font-family: Arial;">
                        <tr>
                            <td style="font-size: 10pt; font-family: Arial; height: 22px; font-weight: bold; width: 247px;">
                                <strong>
                                    <asp:CheckBox ID="chkJSEA" runat="server" Text="JSEA" Width="200px" Font-Names="Arial" Font-Size="10pt" ValidationGroup="ValidationGroup1" /></strong></td>
                            <td style="height: 22px; font-weight: bold; font-size: 10pt; width: 278px; font-family: Arial;"><asp:CheckBox ID="chkRISKA" runat="server" Text="Risk Assessment" Width="200px" Font-Bold="True" Font-Names="Arial" Font-Size="10pt" ValidationGroup="ValidationGroup1" /></td>
                            <td style="height: 22px; font-weight: bold; font-size: 10pt; width: 121px; font-family: Arial;"><asp:CheckBox ID="chkWMS" runat="server" Text="Work Method Statement" Width="200px" Font-Bold="True" Font-Names="Arial" Font-Size="10pt" ValidationGroup="ValidationGroup1" /></td>
                        </tr>
                        <tr>
                            <td style="font-size: 12pt; width: 247px; font-family: Arial; height: 22px;">
                                <strong>
                                    <asp:CheckBox ID="chkSOP" runat="server" Text="Safe Operating Procedures" Width="200px" Font-Names="Arial" Font-Size="10pt" ValidationGroup="ValidationGroup1" /></strong></td>
                            <td style="height: 22px" colspan="2">
                                <label><input type="checkbox" id="chkOTHER" runat="server" />Other </label>
                                <asp:TextBox ID="txtOtherFlag" ClientIDMode="Static" runat="server" AutoPostBack="True" CausesValidation="True" ValidationGroup="ValidationGroup1"></asp:TextBox>
                            </td>
                        </tr>
                    </table>
            </td>
        </tr>
...
and much further down is the javascript/jquery stuff, after the end of the Panel above and after the content placeholder
...
    </table>
    </asp:panel>
    <script src="https://code.jquery.com/jquery-1.7.1.js" type="text/javascript"></script>
    <script type="text/javascript">
        $(function(){
            $("#chkOTHER").change(function(){
                if(!$(this).prop("checked")){
                    $("#txtOtherFlag").val('');        
                }
            });
        });
...
some other javascript functions here which work
...
//        $(document).ready(function() {
//            $("#chkOTHER").change(function() {
//                if ($(this).not(":checked")) {
//                    $('.TheTextBox').val("");
//                } 
//            });
//        });
    </script>
</asp:Content>

我上面有Karl和Juan的变体jquery函数。

对此的任何帮助都非常感谢并被采纳。到目前为止，我已经尝试了所有这些，但是当我取消选中复选框时，我仍然无法清除该文本框。

提前谢谢你