How can I determine the SelectedValue of a RadioButtonList in JavaScript?

Question

I have an ASP.NET web page with a databound RadioButtonList. I do not know how many radio buttons will be rendered at design time. I need to determine the SelectedValue on

Answer 1

ASP.NET renders a table and a bunch of other mark-up around the actual radio inputs. The following should work:-

 var list = document.getElementById("radios"); //Client ID of the radiolist
 var inputs = list.getElementsByTagName("input");
 var selected;
 for (var i = 0; i < inputs.length; i++) {
      if (inputs[i].checked) {
          selected = inputs[i];
          break;
       }
  }
  if (selected) {
       alert(selected.value);
  }