Using Javascript to examine a variable's value

Question

Let's say I have a radio select question called Q1. Using JavaScript, how do I examine the value of that variable before the page is advanced? I want this information because I want to display a hidden div based on the selection.

Answer 1

Suppose the name of div hidden is Q2, Please place this code in Q1's footer:

<script type="text/javascript">

function SSI_CustomGraphicalRadiobox(GraphicalRadioboxObj, InputObj)
    {   
        var z=($("input[type=radio]:checked").val());
        //alert(z);
       
        if(z==1)
            {
                    $("#Q2_div").show();
            }
        if(z>1)
            {
                    $("#Q2_div").hide();
                    if($('#Q2').val() != "")
                        {
                                $('#Q2').val("");
                        }
            }
    }

</script>