Jquery 如何在调用Click事件之前检查.Net验证是否为True

我正在使用.Net验证来验证我的表单。问题是，当我单击Submit时，它不会检查表单是否经过验证。即使字段为空，也会触发警报。我希望只有在表单经过验证后才会触发警报。多谢各位

<asp:ValidationSummary ID="ValidationSummary1" runat="server" CssClass="error-box" />

<asp:Label ID="empLast4Lbl" runat="server" Text="Last 4 digits of SSN#">Last 4 digits of SSN</asp:Label>
<asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ControlToValidate="empLast4Txt"
                    ErrorMessage="Last 4 digits of SSN is required." ForeColor="Red" CssClass="float-none">*</asp:RequiredFieldValidator>
<asp:TextBox ID="empLast4Txt" runat="server"></asp:TextBox>

<asp:Label ID="empDobLbl" runat="server" Text="Label">Date of Birth</asp:Label>
<asp:RequiredFieldValidator ID="RequiredFieldValidator2" runat="server" ControlToValidate="empDobTxt"
                    ErrorMessage="Date of Birth is required." ForeColor="Red" CssClass="float-none">*</asp:RequiredFieldValidator>
<asp:TextBox ID="empDobTxt" runat="server"></asp:TextBox>

<asp:Button ID="submitEmp" runat="server" Text="Submit" Class="ap-webmethod" />

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它是通过在ASP.NET母版页中使用jQuery验证来实现的。请参阅此链接

$(".ap-webmethod").click(function () {

                alert("Fired");

        });