问带有无线电按钮的客户端自定义验证

EN

$("form").submit(function(e){

    e.preventDefault();

    if($(this).find("input[name=Gender]:checked").length === 0){
        alert('Gender not selected.');
    }

});

<asp:RadioButtonList ID="Gender" runat="server">
    <asp:ListItem Text="Male" Value="Male" />
    <asp:ListItem Text="Female" Value="Female" />
</asp:RadioButtonList>

<asp:Button ID="Button1"
    Text="Validate"
    runat="server" OnClientClick="return validate();" />
<script>
    function validate() {
        if (checkGender()) {
            return true;
        }
        return false;
    }
    function checkGender() {
        var selectedGenderRB = document.querySelector('#<%=Gender.ClientID%> input:checked');
        if (selectedGenderRB) {
            return true;
        } else {
            alert('gender not selected.');
            return false;
        }
    }
</script>

$('input[type=radio]').change(function(){
    $('p').text('Thanks');
    
});