javascript - 带有复选框验证的 Asp.net Web 表单无法正常工作

Question

我有一个带有 5-6 个输入字段的网络表单，并进行了验证，工作正常，现在我需要为 T&C 添加 checkboc，除非选中 T&C 复选框，否则表单不应提交。

为了简单起见，我在下面的部分代码中删除了一些输入以保持简洁。

我正在使用 OnClientClick="ClientSideClick(this)" 函数来检查验证以禁用多次提交的提交按钮。

如果我不检查复选框验证，则此表单有效，但是当我尝试验证并且“Page_ClientValidate”为 true 时，它​​永远不会检查复选框验证的代码部分。我尝试将代码放在不同的地方，但它不起作用。不是我做错了什么

<asp:Label ID="lblFirstName" runat="server" CssClass="row-label" Text="First Name:"></asp:Label>
<asp:TextBox ID="txtFirstName" runat="server" CssClass="row-input"></asp:TextBox>
<asp:RequiredFieldValidator ID="rfFN" runat="server" ValidationGroup="VG" ErrorMessage="*"  ControlToValidate="txtFirstName" Display="Dynamic"></asp:RequiredFieldValidator>

<asp:Label ID="Label2" runat="server" CssClass="row-label" Text="Last Name:"></asp:Label>
<asp:TextBox ID="txtLastName" runat="server" CssClass="row-input"></asp:TextBox>
<asp:RequiredFieldValidator ID="rfvtxtLastName" runat="server" ValidationGroup="VG" ErrorMessage="*" ControlToValidate="txtLastName" Display="Dynamic"></asp:RequiredFieldValidator>

<asp:Label ID="lblEmail" runat="server" CssClass="row-label" Text="E-mail:"></asp:Label>
<asp:TextBox ID="txtEmail" runat="server" CssClass="row-input"></asp:TextBox>
<asp:RequiredFieldValidator ID="rfvEmail" runat="server" ValidationGroup="VG" ErrorMessage="*"  ControlToValidate="txtEmail" Display="Dynamic"></asp:RequiredFieldValidator>
<asp:RegularExpressionValidator ID="revEmail" runat="server" ErrorMessage="*"  ControlToValidate="txtEmail" ValidationExpression="\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*" ValidationGroup="VG" Display="Dynamic"></asp:RegularExpressionValidator>

<asp:CheckBox ID="chkIAgreeSub" runat="server"  /> I agree to Terms & condition

<asp:Button ID="btnSave" runat="server" CssClass="btn btn-submit" Text="Submit" OnClick="btnSave_Click" OnClientClick="ClientSideClick(this)" UseSubmitBehavior="False" ValidationGroup="VG" />

<script type="text/javascript">
        //Avoid Multiple Submission
        function ClientSideClick(myButton) {
            // Client side validation
            if (typeof (Page_ClientValidate) == 'function') {

               if (Page_ClientValidate() == false)
               {
                  console.log("VALIDATION FALSE");
                  return false;
               }
               else
               {
               console.log("VALIDATION TRUE");
                    if (document.getElementById("<%=chkboxTC.ClientID %>").checked == true) {
                        console.log("T&C  checked TRUE");
                        return true;
                    } else {
                        console.log("T&C NOT  checked FALSE");
                        return false;
                    }
               }


            }

            if (myButton.getAttribute('type') == 'button') {
                // diable the button
                myButton.disabled = true;
                myButton.value = "Processing...";
            }
            return true;

        }

 </script>      

Answer 1

您的代码不起作用，因为 asp:CheckBox 呈现为

<label id="the_long_webforms_id">
    <input type="checkbox"/>
    I agree to Terms & condition
</label>

所以这条线

document.getElementById("<%=chkboxTC.ClientID %>").checked

失败。你将需要类似的东西

// provided a class from the checkbox from preventing using the client id
// then took the child that is input:checkbox of the label
e.IsValid = document.querySelector('.agree-terms input').checked;

<小时/>

更简单的方法是使用这个

<asp:CheckBox ID="chkIAgreeSub" runat="server"
    CssClass="agree-terms"
    Text="I agree to Terms & condition">
</asp:CheckBox>
<asp:CustomValidator ID="CheckBoxRequired" runat="server" 
    EnableClientScript="true"
    ErrorMessage="You must select this box to proceed"
    ValidationGroup="VG"
    ClientValidationFunction="CheckBoxRequired_ClientValidate">
</asp:CustomValidator>

JavaScript

function CheckBoxRequired_ClientValidate(sender, e)
{
    e.IsValid = document.querySelector('.agree-terms input').checked;
    //e.IsValid = jQuery(".agree-terms input:checkbox").is(':checked');
}