How can I apply a CSS class to a group of radio buttons within a radio button list?

I'm attempting to validate a radio button group and apply a specific CSS class to it. Since this is a server control, I can only apply the class one way. However, upon checking with jQuery, I discovered that the class is actually being attached to the table containing the radio buttons, not the group itself.

Here's the snippet of my code:

<asp:RadioButtonList CssClass="required"  ID="rdb_studysubj"  runat="server" OnSelectedIndexChanged="rdb_studysubj_SelectedIndexChanged">
    <asp:ListItem  Value="Humans">Humans</asp:ListItem>
    <asp:ListItem Value="Non-Human primates">Non-Human primates</asp:ListItem>
    <asp:ListItem Value="Rodents">Rodents</asp:ListItem>
    <asp:ListItem Value="Others">Others</asp:ListItem>
</asp:RadioButtonList>

Upon trying to validate using jQuery, it's showing as invalid.

function WebForm_OnSubmit() {
    if($('.required').val() == null) {              
         $("#validation_dialog").dialog({
             title: "Validation Error!",
             modal: true,
             resizable: false,
             buttons: {
                 Close: function () {
                     $(this).dialog('close');
                 }
             }
         });
         return false;
     }
     return true;
}

The issue seems to be that the CSS class is being applied to the table instead of the radio button group itself. How can we resolve this?

Answer №1

To determine if the value of a child selector input is null, you can use the following code:

if ($('.required input').val() == null) {

If your goal is to check if only one of the radio buttons has been selected, you should use this conditional statement:

if ($('.required input:checked').length > 0) {

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